jtBaseApp/node_modules/video.js/core.es.js

/**
 * @license
 * Video.js 8.3.0 <http://videojs.com/>
 * Copyright Brightcove, Inc. <https://www.brightcove.com/>
 * Available under Apache License Version 2.0
 * <https://github.com/videojs/video.js/blob/main/LICENSE>
 *
 * Includes vtt.js <https://github.com/mozilla/vtt.js>
 * Available under Apache License Version 2.0
 * <https://github.com/mozilla/vtt.js/blob/main/LICENSE>
 */

import window from 'global/window';
import document from 'global/document';
import keycode from 'keycode';
import safeParseTuple from 'safe-json-parse/tuple';
import XHR from '@videojs/xhr';
import vtt from 'videojs-vtt.js';

var version = "8.3.0";

/**
 * An Object that contains lifecycle hooks as keys which point to an array
 * of functions that are run when a lifecycle is triggered
 *
 * @private
 */
const hooks_ = {};

/**
 * Get a list of hooks for a specific lifecycle
 *
 * @param  {string} type
 *         the lifecycle to get hooks from
 *
 * @param  {Function|Function[]} [fn]
 *         Optionally add a hook (or hooks) to the lifecycle that your are getting.
 *
 * @return {Array}
 *         an array of hooks, or an empty array if there are none.
 */
const hooks = function (type, fn) {
  hooks_[type] = hooks_[type] || [];
  if (fn) {
    hooks_[type] = hooks_[type].concat(fn);
  }
  return hooks_[type];
};

/**
 * Add a function hook to a specific videojs lifecycle.
 *
 * @param {string} type
 *        the lifecycle to hook the function to.
 *
 * @param {Function|Function[]}
 *        The function or array of functions to attach.
 */
const hook = function (type, fn) {
  hooks(type, fn);
};

/**
 * Remove a hook from a specific videojs lifecycle.
 *
 * @param  {string} type
 *         the lifecycle that the function hooked to
 *
 * @param  {Function} fn
 *         The hooked function to remove
 *
 * @return {boolean}
 *         The function that was removed or undef
 */
const removeHook = function (type, fn) {
  const index = hooks(type).indexOf(fn);
  if (index <= -1) {
    return false;
  }
  hooks_[type] = hooks_[type].slice();
  hooks_[type].splice(index, 1);
  return true;
};

/**
 * Add a function hook that will only run once to a specific videojs lifecycle.
 *
 * @param {string} type
 *        the lifecycle to hook the function to.
 *
 * @param {Function|Function[]}
 *        The function or array of functions to attach.
 */
const hookOnce = function (type, fn) {
  hooks(type, [].concat(fn).map(original => {
    const wrapper = (...args) => {
      removeHook(type, wrapper);
      return original(...args);
    };
    return wrapper;
  }));
};

/**
 * @file fullscreen-api.js
 * @module fullscreen-api
 */

/**
 * Store the browser-specific methods for the fullscreen API.
 *
 * @type {Object}
 * @see [Specification]{@link https://fullscreen.spec.whatwg.org}
 * @see [Map Approach From Screenfull.js]{@link https://github.com/sindresorhus/screenfull.js}
 */
const FullscreenApi = {
  prefixed: true
};

// browser API methods
const apiMap = [['requestFullscreen', 'exitFullscreen', 'fullscreenElement', 'fullscreenEnabled', 'fullscreenchange', 'fullscreenerror', 'fullscreen'],
// WebKit
['webkitRequestFullscreen', 'webkitExitFullscreen', 'webkitFullscreenElement', 'webkitFullscreenEnabled', 'webkitfullscreenchange', 'webkitfullscreenerror', '-webkit-full-screen'],
// Mozilla
['mozRequestFullScreen', 'mozCancelFullScreen', 'mozFullScreenElement', 'mozFullScreenEnabled', 'mozfullscreenchange', 'mozfullscreenerror', '-moz-full-screen'],
// Microsoft
['msRequestFullscreen', 'msExitFullscreen', 'msFullscreenElement', 'msFullscreenEnabled', 'MSFullscreenChange', 'MSFullscreenError', '-ms-fullscreen']];
const specApi = apiMap[0];
let browserApi;

// determine the supported set of functions
for (let i = 0; i < apiMap.length; i++) {
  // check for exitFullscreen function
  if (apiMap[i][1] in document) {
    browserApi = apiMap[i];
    break;
  }
}

// map the browser API names to the spec API names
if (browserApi) {
  for (let i = 0; i < browserApi.length; i++) {
    FullscreenApi[specApi[i]] = browserApi[i];
  }
  FullscreenApi.prefixed = browserApi[0] !== specApi[0];
}

/**
 * @file create-logger.js
 * @module create-logger
 */

// This is the private tracking variable for the logging history.
let history = [];

/**
 * Log messages to the console and history based on the type of message
 *
 * @private
 * @param  {string} type
 *         The name of the console method to use.
 *
 * @param  {Array} args
 *         The arguments to be passed to the matching console method.
 */
const LogByTypeFactory = (name, log) => (type, level, args) => {
  const lvl = log.levels[level];
  const lvlRegExp = new RegExp(`^(${lvl})$`);
  if (type !== 'log') {
    // Add the type to the front of the message when it's not "log".
    args.unshift(type.toUpperCase() + ':');
  }

  // Add console prefix after adding to history.
  args.unshift(name + ':');

  // Add a clone of the args at this point to history.
  if (history) {
    history.push([].concat(args));

    // only store 1000 history entries
    const splice = history.length - 1000;
    history.splice(0, splice > 0 ? splice : 0);
  }

  // If there's no console then don't try to output messages, but they will
  // still be stored in history.
  if (!window.console) {
    return;
  }

  // Was setting these once outside of this function, but containing them
  // in the function makes it easier to test cases where console doesn't exist
  // when the module is executed.
  let fn = window.console[type];
  if (!fn && type === 'debug') {
    // Certain browsers don't have support for console.debug. For those, we
    // should default to the closest comparable log.
    fn = window.console.info || window.console.log;
  }

  // Bail out if there's no console or if this type is not allowed by the
  // current logging level.
  if (!fn || !lvl || !lvlRegExp.test(type)) {
    return;
  }
  fn[Array.isArray(args) ? 'apply' : 'call'](window.console, args);
};
function createLogger$1(name) {
  // This is the private tracking variable for logging level.
  let level = 'info';

  // the curried logByType bound to the specific log and history
  let logByType;

  /**
   * Logs plain debug messages. Similar to `console.log`.
   *
   * Due to [limitations](https://github.com/jsdoc3/jsdoc/issues/955#issuecomment-313829149)
   * of our JSDoc template, we cannot properly document this as both a function
   * and a namespace, so its function signature is documented here.
   *
   * #### Arguments
   * ##### *args
   * *[]
   *
   * Any combination of values that could be passed to `console.log()`.
   *
   * #### Return Value
   *
   * `undefined`
   *
   * @namespace
   * @param    {...*} args
   *           One or more messages or objects that should be logged.
   */
  const log = function (...args) {
    logByType('log', level, args);
  };

  // This is the logByType helper that the logging methods below use
  logByType = LogByTypeFactory(name, log);

  /**
   * Create a new sublogger which chains the old name to the new name.
   *
   * For example, doing `videojs.log.createLogger('player')` and then using that logger will log the following:
   * ```js
   *  mylogger('foo');
   *  // > VIDEOJS: player: foo
   * ```
   *
   * @param {string} name
   *        The name to add call the new logger
   * @return {Object}
   */
  log.createLogger = subname => createLogger$1(name + ': ' + subname);

  /**
   * Enumeration of available logging levels, where the keys are the level names
   * and the values are `|`-separated strings containing logging methods allowed
   * in that logging level. These strings are used to create a regular expression
   * matching the function name being called.
   *
   * Levels provided by Video.js are:
   *
   * - `off`: Matches no calls. Any value that can be cast to `false` will have
   *   this effect. The most restrictive.
   * - `all`: Matches only Video.js-provided functions (`debug`, `log`,
   *   `log.warn`, and `log.error`).
   * - `debug`: Matches `log.debug`, `log`, `log.warn`, and `log.error` calls.
   * - `info` (default): Matches `log`, `log.warn`, and `log.error` calls.
   * - `warn`: Matches `log.warn` and `log.error` calls.
   * - `error`: Matches only `log.error` calls.
   *
   * @type {Object}
   */
  log.levels = {
    all: 'debug|log|warn|error',
    off: '',
    debug: 'debug|log|warn|error',
    info: 'log|warn|error',
    warn: 'warn|error',
    error: 'error',
    DEFAULT: level
  };

  /**
   * Get or set the current logging level.
   *
   * If a string matching a key from {@link module:log.levels} is provided, acts
   * as a setter.
   *
   * @param  {string} [lvl]
   *         Pass a valid level to set a new logging level.
   *
   * @return {string}
   *         The current logging level.
   */
  log.level = lvl => {
    if (typeof lvl === 'string') {
      if (!log.levels.hasOwnProperty(lvl)) {
        throw new Error(`"${lvl}" in not a valid log level`);
      }
      level = lvl;
    }
    return level;
  };

  /**
   * Returns an array containing everything that has been logged to the history.
   *
   * This array is a shallow clone of the internal history record. However, its
   * contents are _not_ cloned; so, mutating objects inside this array will
   * mutate them in history.
   *
   * @return {Array}
   */
  log.history = () => history ? [].concat(history) : [];

  /**
   * Allows you to filter the history by the given logger name
   *
   * @param {string} fname
   *        The name to filter by
   *
   * @return {Array}
   *         The filtered list to return
   */
  log.history.filter = fname => {
    return (history || []).filter(historyItem => {
      // if the first item in each historyItem includes `fname`, then it's a match
      return new RegExp(`.*${fname}.*`).test(historyItem[0]);
    });
  };

  /**
   * Clears the internal history tracking, but does not prevent further history
   * tracking.
   */
  log.history.clear = () => {
    if (history) {
      history.length = 0;
    }
  };

  /**
   * Disable history tracking if it is currently enabled.
   */
  log.history.disable = () => {
    if (history !== null) {
      history.length = 0;
      history = null;
    }
  };

  /**
   * Enable history tracking if it is currently disabled.
   */
  log.history.enable = () => {
    if (history === null) {
      history = [];
    }
  };

  /**
   * Logs error messages. Similar to `console.error`.
   *
   * @param {...*} args
   *        One or more messages or objects that should be logged as an error
   */
  log.error = (...args) => logByType('error', level, args);

  /**
   * Logs warning messages. Similar to `console.warn`.
   *
   * @param {...*} args
   *        One or more messages or objects that should be logged as a warning.
   */
  log.warn = (...args) => logByType('warn', level, args);

  /**
   * Logs debug messages. Similar to `console.debug`, but may also act as a comparable
   * log if `console.debug` is not available
   *
   * @param {...*} args
   *        One or more messages or objects that should be logged as debug.
   */
  log.debug = (...args) => logByType('debug', level, args);
  return log;
}

/**
 * @file log.js
 * @module log
 */
const log = createLogger$1('VIDEOJS');
const createLogger = log.createLogger;

/**
 * @file obj.js
 * @module obj
 */

/**
 * @callback obj:EachCallback
 *
 * @param {*} value
 *        The current key for the object that is being iterated over.
 *
 * @param {string} key
 *        The current key-value for object that is being iterated over
 */

/**
 * @callback obj:ReduceCallback
 *
 * @param {*} accum
 *        The value that is accumulating over the reduce loop.
 *
 * @param {*} value
 *        The current key for the object that is being iterated over.
 *
 * @param {string} key
 *        The current key-value for object that is being iterated over
 *
 * @return {*}
 *         The new accumulated value.
 */
const toString = Object.prototype.toString;

/**
 * Get the keys of an Object
 *
 * @param {Object}
 *        The Object to get the keys from
 *
 * @return {string[]}
 *         An array of the keys from the object. Returns an empty array if the
 *         object passed in was invalid or had no keys.
 *
 * @private
 */
const keys = function (object) {
  return isObject(object) ? Object.keys(object) : [];
};

/**
 * Array-like iteration for objects.
 *
 * @param {Object} object
 *        The object to iterate over
 *
 * @param {obj:EachCallback} fn
 *        The callback function which is called for each key in the object.
 */
function each(object, fn) {
  keys(object).forEach(key => fn(object[key], key));
}

/**
 * Array-like reduce for objects.
 *
 * @param {Object} object
 *        The Object that you want to reduce.
 *
 * @param {Function} fn
 *         A callback function which is called for each key in the object. It
 *         receives the accumulated value and the per-iteration value and key
 *         as arguments.
 *
 * @param {*} [initial = 0]
 *        Starting value
 *
 * @return {*}
 *         The final accumulated value.
 */
function reduce(object, fn, initial = 0) {
  return keys(object).reduce((accum, key) => fn(accum, object[key], key), initial);
}

/**
 * Returns whether a value is an object of any kind - including DOM nodes,
 * arrays, regular expressions, etc. Not functions, though.
 *
 * This avoids the gotcha where using `typeof` on a `null` value
 * results in `'object'`.
 *
 * @param  {Object} value
 * @return {boolean}
 */
function isObject(value) {
  return !!value && typeof value === 'object';
}

/**
 * Returns whether an object appears to be a "plain" object - that is, a
 * direct instance of `Object`.
 *
 * @param  {Object} value
 * @return {boolean}
 */
function isPlain(value) {
  return isObject(value) && toString.call(value) === '[object Object]' && value.constructor === Object;
}

/**
 * Merge two objects recursively.
 *
 * Performs a deep merge like
 * {@link https://lodash.com/docs/4.17.10#merge|lodash.merge}, but only merges
 * plain objects (not arrays, elements, or anything else).
 *
 * Non-plain object values will be copied directly from the right-most
 * argument.
 *
 * @param   {Object[]} sources
 *          One or more objects to merge into a new object.
 *
 * @return {Object}
 *          A new object that is the merged result of all sources.
 */
function merge(...sources) {
  const result = {};
  sources.forEach(source => {
    if (!source) {
      return;
    }
    each(source, (value, key) => {
      if (!isPlain(value)) {
        result[key] = value;
        return;
      }
      if (!isPlain(result[key])) {
        result[key] = {};
      }
      result[key] = merge(result[key], value);
    });
  });
  return result;
}

/**
 * Object.defineProperty but "lazy", which means that the value is only set after
 * it is retrieved the first time, rather than being set right away.
 *
 * @param {Object} obj the object to set the property on
 * @param {string} key the key for the property to set
 * @param {Function} getValue the function used to get the value when it is needed.
 * @param {boolean} setter whether a setter should be allowed or not
 */
function defineLazyProperty(obj, key, getValue, setter = true) {
  const set = value => Object.defineProperty(obj, key, {
    value,
    enumerable: true,
    writable: true
  });
  const options = {
    configurable: true,
    enumerable: true,
    get() {
      const value = getValue();
      set(value);
      return value;
    }
  };
  if (setter) {
    options.set = set;
  }
  return Object.defineProperty(obj, key, options);
}

var Obj = /*#__PURE__*/Object.freeze({
  __proto__: null,
  each: each,
  reduce: reduce,
  isObject: isObject,
  isPlain: isPlain,
  merge: merge,
  defineLazyProperty: defineLazyProperty
});

/**
 * @file browser.js
 * @module browser
 */

/**
 * Whether or not this device is an iPod.
 *
 * @static
 * @type {Boolean}
 */
let IS_IPOD = false;

/**
 * The detected iOS version - or `null`.
 *
 * @static
 * @type {string|null}
 */
let IOS_VERSION = null;

/**
 * Whether or not this is an Android device.
 *
 * @static
 * @type {Boolean}
 */
let IS_ANDROID = false;

/**
 * The detected Android version - or `null` if not Android or indeterminable.
 *
 * @static
 * @type {number|string|null}
 */
let ANDROID_VERSION;

/**
 * Whether or not this is Mozilla Firefox.
 *
 * @static
 * @type {Boolean}
 */
let IS_FIREFOX = false;

/**
 * Whether or not this is Microsoft Edge.
 *
 * @static
 * @type {Boolean}
 */
let IS_EDGE = false;

/**
 * Whether or not this is any Chromium Browser
 *
 * @static
 * @type {Boolean}
 */
let IS_CHROMIUM = false;

/**
 * Whether or not this is any Chromium browser that is not Edge.
 *
 * This will also be `true` for Chrome on iOS, which will have different support
 * as it is actually Safari under the hood.
 *
 * Deprecated, as the behaviour to not match Edge was to prevent Legacy Edge's UA matching.
 * IS_CHROMIUM should be used instead.
 * "Chromium but not Edge" could be explicitly tested with IS_CHROMIUM && !IS_EDGE
 *
 * @static
 * @deprecated
 * @type {Boolean}
 */
let IS_CHROME = false;

/**
 * The detected Chromium version - or `null`.
 *
 * @static
 * @type {number|null}
 */
let CHROMIUM_VERSION = null;

/**
 * The detected Google Chrome version - or `null`.
 * This has always been the _Chromium_ version, i.e. would return on Chromium Edge.
 * Deprecated, use CHROMIUM_VERSION instead.
 *
 * @static
 * @deprecated
 * @type {number|null}
 */
let CHROME_VERSION = null;

/**
 * The detected Internet Explorer version - or `null`.
 *
 * @static
 * @deprecated
 * @type {number|null}
 */
let IE_VERSION = null;

/**
 * Whether or not this is desktop Safari.
 *
 * @static
 * @type {Boolean}
 */
let IS_SAFARI = false;

/**
 * Whether or not this is a Windows machine.
 *
 * @static
 * @type {Boolean}
 */
let IS_WINDOWS = false;

/**
 * Whether or not this device is an iPad.
 *
 * @static
 * @type {Boolean}
 */
let IS_IPAD = false;

/**
 * Whether or not this device is an iPhone.
 *
 * @static
 * @type {Boolean}
 */
// The Facebook app's UIWebView identifies as both an iPhone and iPad, so
// to identify iPhones, we need to exclude iPads.
// http://artsy.github.io/blog/2012/10/18/the-perils-of-ios-user-agent-sniffing/
let IS_IPHONE = false;

/**
 * Whether or not this device is touch-enabled.
 *
 * @static
 * @const
 * @type {Boolean}
 */
const TOUCH_ENABLED = Boolean(isReal() && ('ontouchstart' in window || window.navigator.maxTouchPoints || window.DocumentTouch && window.document instanceof window.DocumentTouch));
const UAD = window.navigator && window.navigator.userAgentData;
if (UAD) {
  // If userAgentData is present, use it instead of userAgent to avoid warnings
  // Currently only implemented on Chromium
  // userAgentData does not expose Android version, so ANDROID_VERSION remains `null`

  IS_ANDROID = UAD.platform === 'Android';
  IS_EDGE = Boolean(UAD.brands.find(b => b.brand === 'Microsoft Edge'));
  IS_CHROMIUM = Boolean(UAD.brands.find(b => b.brand === 'Chromium'));
  IS_CHROME = !IS_EDGE && IS_CHROMIUM;
  CHROMIUM_VERSION = CHROME_VERSION = (UAD.brands.find(b => b.brand === 'Chromium') || {}).version || null;
  IS_WINDOWS = UAD.platform === 'Windows';
}

// If the browser is not Chromium, either userAgentData is not present which could be an old Chromium browser,
//  or it's a browser that has added userAgentData since that we don't have tests for yet. In either case,
// the checks need to be made agiainst the regular userAgent string.
if (!IS_CHROMIUM) {
  const USER_AGENT = window.navigator && window.navigator.userAgent || '';
  IS_IPOD = /iPod/i.test(USER_AGENT);
  IOS_VERSION = function () {
    const match = USER_AGENT.match(/OS (\d+)_/i);
    if (match && match[1]) {
      return match[1];
    }
    return null;
  }();
  IS_ANDROID = /Android/i.test(USER_AGENT);
  ANDROID_VERSION = function () {
    // This matches Android Major.Minor.Patch versions
    // ANDROID_VERSION is Major.Minor as a Number, if Minor isn't available, then only Major is returned
    const match = USER_AGENT.match(/Android (\d+)(?:\.(\d+))?(?:\.(\d+))*/i);
    if (!match) {
      return null;
    }
    const major = match[1] && parseFloat(match[1]);
    const minor = match[2] && parseFloat(match[2]);
    if (major && minor) {
      return parseFloat(match[1] + '.' + match[2]);
    } else if (major) {
      return major;
    }
    return null;
  }();
  IS_FIREFOX = /Firefox/i.test(USER_AGENT);
  IS_EDGE = /Edg/i.test(USER_AGENT);
  IS_CHROMIUM = /Chrome/i.test(USER_AGENT) || /CriOS/i.test(USER_AGENT);
  IS_CHROME = !IS_EDGE && IS_CHROMIUM;
  CHROMIUM_VERSION = CHROME_VERSION = function () {
    const match = USER_AGENT.match(/(Chrome|CriOS)\/(\d+)/);
    if (match && match[2]) {
      return parseFloat(match[2]);
    }
    return null;
  }();
  IE_VERSION = function () {
    const result = /MSIE\s(\d+)\.\d/.exec(USER_AGENT);
    let version = result && parseFloat(result[1]);
    if (!version && /Trident\/7.0/i.test(USER_AGENT) && /rv:11.0/.test(USER_AGENT)) {
      // IE 11 has a different user agent string than other IE versions
      version = 11.0;
    }
    return version;
  }();
  IS_SAFARI = /Safari/i.test(USER_AGENT) && !IS_CHROME && !IS_ANDROID && !IS_EDGE;
  IS_WINDOWS = /Windows/i.test(USER_AGENT);
  IS_IPAD = /iPad/i.test(USER_AGENT) || IS_SAFARI && TOUCH_ENABLED && !/iPhone/i.test(USER_AGENT);
  IS_IPHONE = /iPhone/i.test(USER_AGENT) && !IS_IPAD;
}

/**
 * Whether or not this is an iOS device.
 *
 * @static
 * @const
 * @type {Boolean}
 */
const IS_IOS = IS_IPHONE || IS_IPAD || IS_IPOD;

/**
 * Whether or not this is any flavor of Safari - including iOS.
 *
 * @static
 * @const
 * @type {Boolean}
 */
const IS_ANY_SAFARI = (IS_SAFARI || IS_IOS) && !IS_CHROME;

var browser = /*#__PURE__*/Object.freeze({
  __proto__: null,
  get IS_IPOD () { return IS_IPOD; },
  get IOS_VERSION () { return IOS_VERSION; },
  get IS_ANDROID () { return IS_ANDROID; },
  get ANDROID_VERSION () { return ANDROID_VERSION; },
  get IS_FIREFOX () { return IS_FIREFOX; },
  get IS_EDGE () { return IS_EDGE; },
  get IS_CHROMIUM () { return IS_CHROMIUM; },
  get IS_CHROME () { return IS_CHROME; },
  get CHROMIUM_VERSION () { return CHROMIUM_VERSION; },
  get CHROME_VERSION () { return CHROME_VERSION; },
  get IE_VERSION () { return IE_VERSION; },
  get IS_SAFARI () { return IS_SAFARI; },
  get IS_WINDOWS () { return IS_WINDOWS; },
  get IS_IPAD () { return IS_IPAD; },
  get IS_IPHONE () { return IS_IPHONE; },
  TOUCH_ENABLED: TOUCH_ENABLED,
  IS_IOS: IS_IOS,
  IS_ANY_SAFARI: IS_ANY_SAFARI
});

/**
 * @file dom.js
 * @module dom
 */

/**
 * Detect if a value is a string with any non-whitespace characters.
 *
 * @private
 * @param  {string} str
 *         The string to check
 *
 * @return {boolean}
 *         Will be `true` if the string is non-blank, `false` otherwise.
 *
 */
function isNonBlankString(str) {
  // we use str.trim as it will trim any whitespace characters
  // from the front or back of non-whitespace characters. aka
  // Any string that contains non-whitespace characters will
  // still contain them after `trim` but whitespace only strings
  // will have a length of 0, failing this check.
  return typeof str === 'string' && Boolean(str.trim());
}

/**
 * Throws an error if the passed string has whitespace. This is used by
 * class methods to be relatively consistent with the classList API.
 *
 * @private
 * @param  {string} str
 *         The string to check for whitespace.
 *
 * @throws {Error}
 *         Throws an error if there is whitespace in the string.
 */
function throwIfWhitespace(str) {
  // str.indexOf instead of regex because str.indexOf is faster performance wise.
  if (str.indexOf(' ') >= 0) {
    throw new Error('class has illegal whitespace characters');
  }
}

/**
 * Whether the current DOM interface appears to be real (i.e. not simulated).
 *
 * @return {boolean}
 *         Will be `true` if the DOM appears to be real, `false` otherwise.
 */
function isReal() {
  // Both document and window will never be undefined thanks to `global`.
  return document === window.document;
}

/**
 * Determines, via duck typing, whether or not a value is a DOM element.
 *
 * @param  {*} value
 *         The value to check.
 *
 * @return {boolean}
 *         Will be `true` if the value is a DOM element, `false` otherwise.
 */
function isEl(value) {
  return isObject(value) && value.nodeType === 1;
}

/**
 * Determines if the current DOM is embedded in an iframe.
 *
 * @return {boolean}
 *         Will be `true` if the DOM is embedded in an iframe, `false`
 *         otherwise.
 */
function isInFrame() {
  // We need a try/catch here because Safari will throw errors when attempting
  // to get either `parent` or `self`
  try {
    return window.parent !== window.self;
  } catch (x) {
    return true;
  }
}

/**
 * Creates functions to query the DOM using a given method.
 *
 * @private
 * @param   {string} method
 *          The method to create the query with.
 *
 * @return  {Function}
 *          The query method
 */
function createQuerier(method) {
  return function (selector, context) {
    if (!isNonBlankString(selector)) {
      return document[method](null);
    }
    if (isNonBlankString(context)) {
      context = document.querySelector(context);
    }
    const ctx = isEl(context) ? context : document;
    return ctx[method] && ctx[method](selector);
  };
}

/**
 * Creates an element and applies properties, attributes, and inserts content.
 *
 * @param  {string} [tagName='div']
 *         Name of tag to be created.
 *
 * @param  {Object} [properties={}]
 *         Element properties to be applied.
 *
 * @param  {Object} [attributes={}]
 *         Element attributes to be applied.
 *
 * @param {ContentDescriptor} [content]
 *        A content descriptor object.
 *
 * @return {Element}
 *         The element that was created.
 */
function createEl(tagName = 'div', properties = {}, attributes = {}, content) {
  const el = document.createElement(tagName);
  Object.getOwnPropertyNames(properties).forEach(function (propName) {
    const val = properties[propName];

    // Handle textContent since it's not supported everywhere and we have a
    // method for it.
    if (propName === 'textContent') {
      textContent(el, val);
    } else if (el[propName] !== val || propName === 'tabIndex') {
      el[propName] = val;
    }
  });
  Object.getOwnPropertyNames(attributes).forEach(function (attrName) {
    el.setAttribute(attrName, attributes[attrName]);
  });
  if (content) {
    appendContent(el, content);
  }
  return el;
}

/**
 * Injects text into an element, replacing any existing contents entirely.
 *
 * @param  {Element} el
 *         The element to add text content into
 *
 * @param  {string} text
 *         The text content to add.
 *
 * @return {Element}
 *         The element with added text content.
 */
function textContent(el, text) {
  if (typeof el.textContent === 'undefined') {
    el.innerText = text;
  } else {
    el.textContent = text;
  }
  return el;
}

/**
 * Insert an element as the first child node of another
 *
 * @param {Element} child
 *        Element to insert
 *
 * @param {Element} parent
 *        Element to insert child into
 */
function prependTo(child, parent) {
  if (parent.firstChild) {
    parent.insertBefore(child, parent.firstChild);
  } else {
    parent.appendChild(child);
  }
}

/**
 * Check if an element has a class name.
 *
 * @param  {Element} element
 *         Element to check
 *
 * @param  {string} classToCheck
 *         Class name to check for
 *
 * @return {boolean}
 *         Will be `true` if the element has a class, `false` otherwise.
 *
 * @throws {Error}
 *         Throws an error if `classToCheck` has white space.
 */
function hasClass(element, classToCheck) {
  throwIfWhitespace(classToCheck);
  return element.classList.contains(classToCheck);
}

/**
 * Add a class name to an element.
 *
 * @param  {Element} element
 *         Element to add class name to.
 *
 * @param  {...string} classesToAdd
 *         One or more class name to add.
 *
 * @return {Element}
 *         The DOM element with the added class name.
 */
function addClass(element, ...classesToAdd) {
  element.classList.add(...classesToAdd.reduce((prev, current) => prev.concat(current.split(/\s+/)), []));
  return element;
}

/**
 * Remove a class name from an element.
 *
 * @param  {Element} element
 *         Element to remove a class name from.
 *
 * @param  {...string} classesToRemove
 *         One or more class name to remove.
 *
 * @return {Element}
 *         The DOM element with class name removed.
 */
function removeClass(element, ...classesToRemove) {
  // Protect in case the player gets disposed
  if (!element) {
    log.warn("removeClass was called with an element that doesn't exist");
    return null;
  }
  element.classList.remove(...classesToRemove.reduce((prev, current) => prev.concat(current.split(/\s+/)), []));
  return element;
}

/**
 * The callback definition for toggleClass.
 *
 * @callback module:dom~PredicateCallback
 * @param    {Element} element
 *           The DOM element of the Component.
 *
 * @param    {string} classToToggle
 *           The `className` that wants to be toggled
 *
 * @return   {boolean|undefined}
 *           If `true` is returned, the `classToToggle` will be added to the
 *           `element`. If `false`, the `classToToggle` will be removed from
 *           the `element`. If `undefined`, the callback will be ignored.
 */

/**
 * Adds or removes a class name to/from an element depending on an optional
 * condition or the presence/absence of the class name.
 *
 * @param  {Element} element
 *         The element to toggle a class name on.
 *
 * @param  {string} classToToggle
 *         The class that should be toggled.
 *
 * @param  {boolean|module:dom~PredicateCallback} [predicate]
 *         See the return value for {@link module:dom~PredicateCallback}
 *
 * @return {Element}
 *         The element with a class that has been toggled.
 */
function toggleClass(element, classToToggle, predicate) {
  if (typeof predicate === 'function') {
    predicate = predicate(element, classToToggle);
  }
  if (typeof predicate !== 'boolean') {
    predicate = undefined;
  }
  classToToggle.split(/\s+/).forEach(className => element.classList.toggle(className, predicate));
  return element;
}

/**
 * Apply attributes to an HTML element.
 *
 * @param {Element} el
 *        Element to add attributes to.
 *
 * @param {Object} [attributes]
 *        Attributes to be applied.
 */
function setAttributes(el, attributes) {
  Object.getOwnPropertyNames(attributes).forEach(function (attrName) {
    const attrValue = attributes[attrName];
    if (attrValue === null || typeof attrValue === 'undefined' || attrValue === false) {
      el.removeAttribute(attrName);
    } else {
      el.setAttribute(attrName, attrValue === true ? '' : attrValue);
    }
  });
}

/**
 * Get an element's attribute values, as defined on the HTML tag.
 *
 * Attributes are not the same as properties. They're defined on the tag
 * or with setAttribute.
 *
 * @param  {Element} tag
 *         Element from which to get tag attributes.
 *
 * @return {Object}
 *         All attributes of the element. Boolean attributes will be `true` or
 *         `false`, others will be strings.
 */
function getAttributes(tag) {
  const obj = {};

  // known boolean attributes
  // we can check for matching boolean properties, but not all browsers
  // and not all tags know about these attributes, so, we still want to check them manually
  const knownBooleans = ',' + 'autoplay,controls,playsinline,loop,muted,default,defaultMuted' + ',';
  if (tag && tag.attributes && tag.attributes.length > 0) {
    const attrs = tag.attributes;
    for (let i = attrs.length - 1; i >= 0; i--) {
      const attrName = attrs[i].name;
      let attrVal = attrs[i].value;

      // check for known booleans
      // the matching element property will return a value for typeof
      if (typeof tag[attrName] === 'boolean' || knownBooleans.indexOf(',' + attrName + ',') !== -1) {
        // the value of an included boolean attribute is typically an empty
        // string ('') which would equal false if we just check for a false value.
        // we also don't want support bad code like autoplay='false'
        attrVal = attrVal !== null ? true : false;
      }
      obj[attrName] = attrVal;
    }
  }
  return obj;
}

/**
 * Get the value of an element's attribute.
 *
 * @param {Element} el
 *        A DOM element.
 *
 * @param {string} attribute
 *        Attribute to get the value of.
 *
 * @return {string}
 *         The value of the attribute.
 */
function getAttribute(el, attribute) {
  return el.getAttribute(attribute);
}

/**
 * Set the value of an element's attribute.
 *
 * @param {Element} el
 *        A DOM element.
 *
 * @param {string} attribute
 *        Attribute to set.
 *
 * @param {string} value
 *        Value to set the attribute to.
 */
function setAttribute(el, attribute, value) {
  el.setAttribute(attribute, value);
}

/**
 * Remove an element's attribute.
 *
 * @param {Element} el
 *        A DOM element.
 *
 * @param {string} attribute
 *        Attribute to remove.
 */
function removeAttribute(el, attribute) {
  el.removeAttribute(attribute);
}

/**
 * Attempt to block the ability to select text.
 */
function blockTextSelection() {
  document.body.focus();
  document.onselectstart = function () {
    return false;
  };
}

/**
 * Turn off text selection blocking.
 */
function unblockTextSelection() {
  document.onselectstart = function () {
    return true;
  };
}

/**
 * Identical to the native `getBoundingClientRect` function, but ensures that
 * the method is supported at all (it is in all browsers we claim to support)
 * and that the element is in the DOM before continuing.
 *
 * This wrapper function also shims properties which are not provided by some
 * older browsers (namely, IE8).
 *
 * Additionally, some browsers do not support adding properties to a
 * `ClientRect`/`DOMRect` object; so, we shallow-copy it with the standard
 * properties (except `x` and `y` which are not widely supported). This helps
 * avoid implementations where keys are non-enumerable.
 *
 * @param  {Element} el
 *         Element whose `ClientRect` we want to calculate.
 *
 * @return {Object|undefined}
 *         Always returns a plain object - or `undefined` if it cannot.
 */
function getBoundingClientRect(el) {
  if (el && el.getBoundingClientRect && el.parentNode) {
    const rect = el.getBoundingClientRect();
    const result = {};
    ['bottom', 'height', 'left', 'right', 'top', 'width'].forEach(k => {
      if (rect[k] !== undefined) {
        result[k] = rect[k];
      }
    });
    if (!result.height) {
      result.height = parseFloat(computedStyle(el, 'height'));
    }
    if (!result.width) {
      result.width = parseFloat(computedStyle(el, 'width'));
    }
    return result;
  }
}

/**
 * Represents the position of a DOM element on the page.
 *
 * @typedef  {Object} module:dom~Position
 *
 * @property {number} left
 *           Pixels to the left.
 *
 * @property {number} top
 *           Pixels from the top.
 */

/**
 * Get the position of an element in the DOM.
 *
 * Uses `getBoundingClientRect` technique from John Resig.
 *
 * @see http://ejohn.org/blog/getboundingclientrect-is-awesome/
 *
 * @param  {Element} el
 *         Element from which to get offset.
 *
 * @return {module:dom~Position}
 *         The position of the element that was passed in.
 */
function findPosition(el) {
  if (!el || el && !el.offsetParent) {
    return {
      left: 0,
      top: 0,
      width: 0,
      height: 0
    };
  }
  const width = el.offsetWidth;
  const height = el.offsetHeight;
  let left = 0;
  let top = 0;
  while (el.offsetParent && el !== document[FullscreenApi.fullscreenElement]) {
    left += el.offsetLeft;
    top += el.offsetTop;
    el = el.offsetParent;
  }
  return {
    left,
    top,
    width,
    height
  };
}

/**
 * Represents x and y coordinates for a DOM element or mouse pointer.
 *
 * @typedef  {Object} module:dom~Coordinates
 *
 * @property {number} x
 *           x coordinate in pixels
 *
 * @property {number} y
 *           y coordinate in pixels
 */

/**
 * Get the pointer position within an element.
 *
 * The base on the coordinates are the bottom left of the element.
 *
 * @param  {Element} el
 *         Element on which to get the pointer position on.
 *
 * @param  {Event} event
 *         Event object.
 *
 * @return {module:dom~Coordinates}
 *         A coordinates object corresponding to the mouse position.
 *
 */
function getPointerPosition(el, event) {
  const translated = {
    x: 0,
    y: 0
  };
  if (IS_IOS) {
    let item = el;
    while (item && item.nodeName.toLowerCase() !== 'html') {
      const transform = computedStyle(item, 'transform');
      if (/^matrix/.test(transform)) {
        const values = transform.slice(7, -1).split(/,\s/).map(Number);
        translated.x += values[4];
        translated.y += values[5];
      } else if (/^matrix3d/.test(transform)) {
        const values = transform.slice(9, -1).split(/,\s/).map(Number);
        translated.x += values[12];
        translated.y += values[13];
      }
      item = item.parentNode;
    }
  }
  const position = {};
  const boxTarget = findPosition(event.target);
  const box = findPosition(el);
  const boxW = box.width;
  const boxH = box.height;
  let offsetY = event.offsetY - (box.top - boxTarget.top);
  let offsetX = event.offsetX - (box.left - boxTarget.left);
  if (event.changedTouches) {
    offsetX = event.changedTouches[0].pageX - box.left;
    offsetY = event.changedTouches[0].pageY + box.top;
    if (IS_IOS) {
      offsetX -= translated.x;
      offsetY -= translated.y;
    }
  }
  position.y = 1 - Math.max(0, Math.min(1, offsetY / boxH));
  position.x = Math.max(0, Math.min(1, offsetX / boxW));
  return position;
}

/**
 * Determines, via duck typing, whether or not a value is a text node.
 *
 * @param  {*} value
 *         Check if this value is a text node.
 *
 * @return {boolean}
 *         Will be `true` if the value is a text node, `false` otherwise.
 */
function isTextNode(value) {
  return isObject(value) && value.nodeType === 3;
}

/**
 * Empties the contents of an element.
 *
 * @param  {Element} el
 *         The element to empty children from
 *
 * @return {Element}
 *         The element with no children
 */
function emptyEl(el) {
  while (el.firstChild) {
    el.removeChild(el.firstChild);
  }
  return el;
}

/**
 * This is a mixed value that describes content to be injected into the DOM
 * via some method. It can be of the following types:
 *
 * Type       | Description
 * -----------|-------------
 * `string`   | The value will be normalized into a text node.
 * `Element`  | The value will be accepted as-is.
 * `Text`     | A TextNode. The value will be accepted as-is.
 * `Array`    | A one-dimensional array of strings, elements, text nodes, or functions. These functions should return a string, element, or text node (any other return value, like an array, will be ignored).
 * `Function` | A function, which is expected to return a string, element, text node, or array - any of the other possible values described above. This means that a content descriptor could be a function that returns an array of functions, but those second-level functions must return strings, elements, or text nodes.
 *
 * @typedef {string|Element|Text|Array|Function} ContentDescriptor
 */

/**
 * Normalizes content for eventual insertion into the DOM.
 *
 * This allows a wide range of content definition methods, but helps protect
 * from falling into the trap of simply writing to `innerHTML`, which could
 * be an XSS concern.
 *
 * The content for an element can be passed in multiple types and
 * combinations, whose behavior is as follows:
 *
 * @param {ContentDescriptor} content
 *        A content descriptor value.
 *
 * @return {Array}
 *         All of the content that was passed in, normalized to an array of
 *         elements or text nodes.
 */
function normalizeContent(content) {
  // First, invoke content if it is a function. If it produces an array,
  // that needs to happen before normalization.
  if (typeof content === 'function') {
    content = content();
  }

  // Next up, normalize to an array, so one or many items can be normalized,
  // filtered, and returned.
  return (Array.isArray(content) ? content : [content]).map(value => {
    // First, invoke value if it is a function to produce a new value,
    // which will be subsequently normalized to a Node of some kind.
    if (typeof value === 'function') {
      value = value();
    }
    if (isEl(value) || isTextNode(value)) {
      return value;
    }
    if (typeof value === 'string' && /\S/.test(value)) {
      return document.createTextNode(value);
    }
  }).filter(value => value);
}

/**
 * Normalizes and appends content to an element.
 *
 * @param  {Element} el
 *         Element to append normalized content to.
 *
 * @param {ContentDescriptor} content
 *        A content descriptor value.
 *
 * @return {Element}
 *         The element with appended normalized content.
 */
function appendContent(el, content) {
  normalizeContent(content).forEach(node => el.appendChild(node));
  return el;
}

/**
 * Normalizes and inserts content into an element; this is identical to
 * `appendContent()`, except it empties the element first.
 *
 * @param {Element} el
 *        Element to insert normalized content into.
 *
 * @param {ContentDescriptor} content
 *        A content descriptor value.
 *
 * @return {Element}
 *         The element with inserted normalized content.
 */
function insertContent(el, content) {
  return appendContent(emptyEl(el), content);
}

/**
 * Check if an event was a single left click.
 *
 * @param  {Event} event
 *         Event object.
 *
 * @return {boolean}
 *         Will be `true` if a single left click, `false` otherwise.
 */
function isSingleLeftClick(event) {
  // Note: if you create something draggable, be sure to
  // call it on both `mousedown` and `mousemove` event,
  // otherwise `mousedown` should be enough for a button

  if (event.button === undefined && event.buttons === undefined) {
    // Why do we need `buttons` ?
    // Because, middle mouse sometimes have this:
    // e.button === 0 and e.buttons === 4
    // Furthermore, we want to prevent combination click, something like
    // HOLD middlemouse then left click, that would be
    // e.button === 0, e.buttons === 5
    // just `button` is not gonna work

    // Alright, then what this block does ?
    // this is for chrome `simulate mobile devices`
    // I want to support this as well

    return true;
  }
  if (event.button === 0 && event.buttons === undefined) {
    // Touch screen, sometimes on some specific device, `buttons`
    // doesn't have anything (safari on ios, blackberry...)

    return true;
  }

  // `mouseup` event on a single left click has
  // `button` and `buttons` equal to 0
  if (event.type === 'mouseup' && event.button === 0 && event.buttons === 0) {
    return true;
  }
  if (event.button !== 0 || event.buttons !== 1) {
    // This is the reason we have those if else block above
    // if any special case we can catch and let it slide
    // we do it above, when get to here, this definitely
    // is-not-left-click

    return false;
  }
  return true;
}

/**
 * Finds a single DOM element matching `selector` within the optional
 * `context` of another DOM element (defaulting to `document`).
 *
 * @param  {string} selector
 *         A valid CSS selector, which will be passed to `querySelector`.
 *
 * @param  {Element|String} [context=document]
 *         A DOM element within which to query. Can also be a selector
 *         string in which case the first matching element will be used
 *         as context. If missing (or no element matches selector), falls
 *         back to `document`.
 *
 * @return {Element|null}
 *         The element that was found or null.
 */
const $ = createQuerier('querySelector');

/**
 * Finds a all DOM elements matching `selector` within the optional
 * `context` of another DOM element (defaulting to `document`).
 *
 * @param  {string} selector
 *         A valid CSS selector, which will be passed to `querySelectorAll`.
 *
 * @param  {Element|String} [context=document]
 *         A DOM element within which to query. Can also be a selector
 *         string in which case the first matching element will be used
 *         as context. If missing (or no element matches selector), falls
 *         back to `document`.
 *
 * @return {NodeList}
 *         A element list of elements that were found. Will be empty if none
 *         were found.
 *
 */
const $$ = createQuerier('querySelectorAll');

/**
 * A safe getComputedStyle.
 *
 * This is needed because in Firefox, if the player is loaded in an iframe with
 * `display:none`, then `getComputedStyle` returns `null`, so, we do a
 * null-check to make sure that the player doesn't break in these cases.
 *
 * @param    {Element} el
 *           The element you want the computed style of
 *
 * @param    {string} prop
 *           The property name you want
 *
 * @see      https://bugzilla.mozilla.org/show_bug.cgi?id=548397
 */
function computedStyle(el, prop) {
  if (!el || !prop) {
    return '';
  }
  if (typeof window.getComputedStyle === 'function') {
    let computedStyleValue;
    try {
      computedStyleValue = window.getComputedStyle(el);
    } catch (e) {
      return '';
    }
    return computedStyleValue ? computedStyleValue.getPropertyValue(prop) || computedStyleValue[prop] : '';
  }
  return '';
}

var Dom = /*#__PURE__*/Object.freeze({
  __proto__: null,
  isReal: isReal,
  isEl: isEl,
  isInFrame: isInFrame,
  createEl: createEl,
  textContent: textContent,
  prependTo: prependTo,
  hasClass: hasClass,
  addClass: addClass,
  removeClass: removeClass,
  toggleClass: toggleClass,
  setAttributes: setAttributes,
  getAttributes: getAttributes,
  getAttribute: getAttribute,
  setAttribute: setAttribute,
  removeAttribute: removeAttribute,
  blockTextSelection: blockTextSelection,
  unblockTextSelection: unblockTextSelection,
  getBoundingClientRect: getBoundingClientRect,
  findPosition: findPosition,
  getPointerPosition: getPointerPosition,
  isTextNode: isTextNode,
  emptyEl: emptyEl,
  normalizeContent: normalizeContent,
  appendContent: appendContent,
  insertContent: insertContent,
  isSingleLeftClick: isSingleLeftClick,
  $: $,
  $$: $$,
  computedStyle: computedStyle
});

/**
 * @file setup.js - Functions for setting up a player without
 * user interaction based on the data-setup `attribute` of the video tag.
 *
 * @module setup
 */
let _windowLoaded = false;
let videojs$1;

/**
 * Set up any tags that have a data-setup `attribute` when the player is started.
 */
const autoSetup = function () {
  if (videojs$1.options.autoSetup === false) {
    return;
  }
  const vids = Array.prototype.slice.call(document.getElementsByTagName('video'));
  const audios = Array.prototype.slice.call(document.getElementsByTagName('audio'));
  const divs = Array.prototype.slice.call(document.getElementsByTagName('video-js'));
  const mediaEls = vids.concat(audios, divs);

  // Check if any media elements exist
  if (mediaEls && mediaEls.length > 0) {
    for (let i = 0, e = mediaEls.length; i < e; i++) {
      const mediaEl = mediaEls[i];

      // Check if element exists, has getAttribute func.
      if (mediaEl && mediaEl.getAttribute) {
        // Make sure this player hasn't already been set up.
        if (mediaEl.player === undefined) {
          const options = mediaEl.getAttribute('data-setup');

          // Check if data-setup attr exists.
          // We only auto-setup if they've added the data-setup attr.
          if (options !== null) {
            // Create new video.js instance.
            videojs$1(mediaEl);
          }
        }

        // If getAttribute isn't defined, we need to wait for the DOM.
      } else {
        autoSetupTimeout(1);
        break;
      }
    }

    // No videos were found, so keep looping unless page is finished loading.
  } else if (!_windowLoaded) {
    autoSetupTimeout(1);
  }
};

/**
 * Wait until the page is loaded before running autoSetup. This will be called in
 * autoSetup if `hasLoaded` returns false.
 *
 * @param {number} wait
 *        How long to wait in ms
 *
 * @param {module:videojs} [vjs]
 *        The videojs library function
 */
function autoSetupTimeout(wait, vjs) {
  // Protect against breakage in non-browser environments
  if (!isReal()) {
    return;
  }
  if (vjs) {
    videojs$1 = vjs;
  }
  window.setTimeout(autoSetup, wait);
}

/**
 * Used to set the internal tracking of window loaded state to true.
 *
 * @private
 */
function setWindowLoaded() {
  _windowLoaded = true;
  window.removeEventListener('load', setWindowLoaded);
}
if (isReal()) {
  if (document.readyState === 'complete') {
    setWindowLoaded();
  } else {
    /**
     * Listen for the load event on window, and set _windowLoaded to true.
     *
     * We use a standard event listener here to avoid incrementing the GUID
     * before any players are created.
     *
     * @listens load
     */
    window.addEventListener('load', setWindowLoaded);
  }
}

/**
 * @file stylesheet.js
 * @module stylesheet
 */

/**
 * Create a DOM style element given a className for it.
 *
 * @param {string} className
 *        The className to add to the created style element.
 *
 * @return {Element}
 *         The element that was created.
 */
const createStyleElement = function (className) {
  const style = document.createElement('style');
  style.className = className;
  return style;
};

/**
 * Add text to a DOM element.
 *
 * @param {Element} el
 *        The Element to add text content to.
 *
 * @param {string} content
 *        The text to add to the element.
 */
const setTextContent = function (el, content) {
  if (el.styleSheet) {
    el.styleSheet.cssText = content;
  } else {
    el.textContent = content;
  }
};

/**
 * @file dom-data.js
 * @module dom-data
 */

/**
 * Element Data Store.
 *
 * Allows for binding data to an element without putting it directly on the
 * element. Ex. Event listeners are stored here.
 * (also from jsninja.com, slightly modified and updated for closure compiler)
 *
 * @type {Object}
 * @private
 */
var DomData = new WeakMap();

/**
 * @file guid.js
 * @module guid
 */

// Default value for GUIDs. This allows us to reset the GUID counter in tests.
//
// The initial GUID is 3 because some users have come to rely on the first
// default player ID ending up as `vjs_video_3`.
//
// See: https://github.com/videojs/video.js/pull/6216
const _initialGuid = 3;

/**
 * Unique ID for an element or function
 *
 * @type {Number}
 */
let _guid = _initialGuid;

/**
 * Get a unique auto-incrementing ID by number that has not been returned before.
 *
 * @return {number}
 *         A new unique ID.
 */
function newGUID() {
  return _guid++;
}

/**
 * @file events.js. An Event System (John Resig - Secrets of a JS Ninja http://jsninja.com/)
 * (Original book version wasn't completely usable, so fixed some things and made Closure Compiler compatible)
 * This should work very similarly to jQuery's events, however it's based off the book version which isn't as
 * robust as jquery's, so there's probably some differences.
 *
 * @file events.js
 * @module events
 */

/**
 * Clean up the listener cache and dispatchers
 *
 * @param {Element|Object} elem
 *        Element to clean up
 *
 * @param {string} type
 *        Type of event to clean up
 */
function _cleanUpEvents(elem, type) {
  if (!DomData.has(elem)) {
    return;
  }
  const data = DomData.get(elem);

  // Remove the events of a particular type if there are none left
  if (data.handlers[type].length === 0) {
    delete data.handlers[type];
    // data.handlers[type] = null;
    // Setting to null was causing an error with data.handlers

    // Remove the meta-handler from the element
    if (elem.removeEventListener) {
      elem.removeEventListener(type, data.dispatcher, false);
    } else if (elem.detachEvent) {
      elem.detachEvent('on' + type, data.dispatcher);
    }
  }

  // Remove the events object if there are no types left
  if (Object.getOwnPropertyNames(data.handlers).length <= 0) {
    delete data.handlers;
    delete data.dispatcher;
    delete data.disabled;
  }

  // Finally remove the element data if there is no data left
  if (Object.getOwnPropertyNames(data).length === 0) {
    DomData.delete(elem);
  }
}

/**
 * Loops through an array of event types and calls the requested method for each type.
 *
 * @param {Function} fn
 *        The event method we want to use.
 *
 * @param {Element|Object} elem
 *        Element or object to bind listeners to
 *
 * @param {string} type
 *        Type of event to bind to.
 *
 * @param {Function} callback
 *        Event listener.
 */
function _handleMultipleEvents(fn, elem, types, callback) {
  types.forEach(function (type) {
    // Call the event method for each one of the types
    fn(elem, type, callback);
  });
}

/**
 * Fix a native event to have standard property values
 *
 * @param {Object} event
 *        Event object to fix.
 *
 * @return {Object}
 *         Fixed event object.
 */
function fixEvent(event) {
  if (event.fixed_) {
    return event;
  }
  function returnTrue() {
    return true;
  }
  function returnFalse() {
    return false;
  }

  // Test if fixing up is needed
  // Used to check if !event.stopPropagation instead of isPropagationStopped
  // But native events return true for stopPropagation, but don't have
  // other expected methods like isPropagationStopped. Seems to be a problem
  // with the Javascript Ninja code. So we're just overriding all events now.
  if (!event || !event.isPropagationStopped || !event.isImmediatePropagationStopped) {
    const old = event || window.event;
    event = {};
    // Clone the old object so that we can modify the values event = {};
    // IE8 Doesn't like when you mess with native event properties
    // Firefox returns false for event.hasOwnProperty('type') and other props
    //  which makes copying more difficult.
    // TODO: Probably best to create a whitelist of event props
    for (const key in old) {
      // Safari 6.0.3 warns you if you try to copy deprecated layerX/Y
      // Chrome warns you if you try to copy deprecated keyboardEvent.keyLocation
      // and webkitMovementX/Y
      // Lighthouse complains if Event.path is copied
      if (key !== 'layerX' && key !== 'layerY' && key !== 'keyLocation' && key !== 'webkitMovementX' && key !== 'webkitMovementY' && key !== 'path') {
        // Chrome 32+ warns if you try to copy deprecated returnValue, but
        // we still want to if preventDefault isn't supported (IE8).
        if (!(key === 'returnValue' && old.preventDefault)) {
          event[key] = old[key];
        }
      }
    }

    // The event occurred on this element
    if (!event.target) {
      event.target = event.srcElement || document;
    }

    // Handle which other element the event is related to
    if (!event.relatedTarget) {
      event.relatedTarget = event.fromElement === event.target ? event.toElement : event.fromElement;
    }

    // Stop the default browser action
    event.preventDefault = function () {
      if (old.preventDefault) {
        old.preventDefault();
      }
      event.returnValue = false;
      old.returnValue = false;
      event.defaultPrevented = true;
    };
    event.defaultPrevented = false;

    // Stop the event from bubbling
    event.stopPropagation = function () {
      if (old.stopPropagation) {
        old.stopPropagation();
      }
      event.cancelBubble = true;
      old.cancelBubble = true;
      event.isPropagationStopped = returnTrue;
    };
    event.isPropagationStopped = returnFalse;

    // Stop the event from bubbling and executing other handlers
    event.stopImmediatePropagation = function () {
      if (old.stopImmediatePropagation) {
        old.stopImmediatePropagation();
      }
      event.isImmediatePropagationStopped = returnTrue;
      event.stopPropagation();
    };
    event.isImmediatePropagationStopped = returnFalse;

    // Handle mouse position
    if (event.clientX !== null && event.clientX !== undefined) {
      const doc = document.documentElement;
      const body = document.body;
      event.pageX = event.clientX + (doc && doc.scrollLeft || body && body.scrollLeft || 0) - (doc && doc.clientLeft || body && body.clientLeft || 0);
      event.pageY = event.clientY + (doc && doc.scrollTop || body && body.scrollTop || 0) - (doc && doc.clientTop || body && body.clientTop || 0);
    }

    // Handle key presses
    event.which = event.charCode || event.keyCode;

    // Fix button for mouse clicks:
    // 0 == left; 1 == middle; 2 == right
    if (event.button !== null && event.button !== undefined) {
      // The following is disabled because it does not pass videojs-standard
      // and... yikes.
      /* eslint-disable */
      event.button = event.button & 1 ? 0 : event.button & 4 ? 1 : event.button & 2 ? 2 : 0;
      /* eslint-enable */
    }
  }

  event.fixed_ = true;
  // Returns fixed-up instance
  return event;
}

/**
 * Whether passive event listeners are supported
 */
let _supportsPassive;
const supportsPassive = function () {
  if (typeof _supportsPassive !== 'boolean') {
    _supportsPassive = false;
    try {
      const opts = Object.defineProperty({}, 'passive', {
        get() {
          _supportsPassive = true;
        }
      });
      window.addEventListener('test', null, opts);
      window.removeEventListener('test', null, opts);
    } catch (e) {
      // disregard
    }
  }
  return _supportsPassive;
};

/**
 * Touch events Chrome expects to be passive
 */
const passiveEvents = ['touchstart', 'touchmove'];

/**
 * Add an event listener to element
 * It stores the handler function in a separate cache object
 * and adds a generic handler to the element's event,
 * along with a unique id (guid) to the element.
 *
 * @param {Element|Object} elem
 *        Element or object to bind listeners to
 *
 * @param {string|string[]} type
 *        Type of event to bind to.
 *
 * @param {Function} fn
 *        Event listener.
 */
function on(elem, type, fn) {
  if (Array.isArray(type)) {
    return _handleMultipleEvents(on, elem, type, fn);
  }
  if (!DomData.has(elem)) {
    DomData.set(elem, {});
  }
  const data = DomData.get(elem);

  // We need a place to store all our handler data
  if (!data.handlers) {
    data.handlers = {};
  }
  if (!data.handlers[type]) {
    data.handlers[type] = [];
  }
  if (!fn.guid) {
    fn.guid = newGUID();
  }
  data.handlers[type].push(fn);
  if (!data.dispatcher) {
    data.disabled = false;
    data.dispatcher = function (event, hash) {
      if (data.disabled) {
        return;
      }
      event = fixEvent(event);
      const handlers = data.handlers[event.type];
      if (handlers) {
        // Copy handlers so if handlers are added/removed during the process it doesn't throw everything off.
        const handlersCopy = handlers.slice(0);
        for (let m = 0, n = handlersCopy.length; m < n; m++) {
          if (event.isImmediatePropagationStopped()) {
            break;
          } else {
            try {
              handlersCopy[m].call(elem, event, hash);
            } catch (e) {
              log.error(e);
            }
          }
        }
      }
    };
  }
  if (data.handlers[type].length === 1) {
    if (elem.addEventListener) {
      let options = false;
      if (supportsPassive() && passiveEvents.indexOf(type) > -1) {
        options = {
          passive: true
        };
      }
      elem.addEventListener(type, data.dispatcher, options);
    } else if (elem.attachEvent) {
      elem.attachEvent('on' + type, data.dispatcher);
    }
  }
}

/**
 * Removes event listeners from an element
 *
 * @param {Element|Object} elem
 *        Object to remove listeners from.
 *
 * @param {string|string[]} [type]
 *        Type of listener to remove. Don't include to remove all events from element.
 *
 * @param {Function} [fn]
 *        Specific listener to remove. Don't include to remove listeners for an event
 *        type.
 */
function off(elem, type, fn) {
  // Don't want to add a cache object through getElData if not needed
  if (!DomData.has(elem)) {
    return;
  }
  const data = DomData.get(elem);

  // If no events exist, nothing to unbind
  if (!data.handlers) {
    return;
  }
  if (Array.isArray(type)) {
    return _handleMultipleEvents(off, elem, type, fn);
  }

  // Utility function
  const removeType = function (el, t) {
    data.handlers[t] = [];
    _cleanUpEvents(el, t);
  };

  // Are we removing all bound events?
  if (type === undefined) {
    for (const t in data.handlers) {
      if (Object.prototype.hasOwnProperty.call(data.handlers || {}, t)) {
        removeType(elem, t);
      }
    }
    return;
  }
  const handlers = data.handlers[type];

  // If no handlers exist, nothing to unbind
  if (!handlers) {
    return;
  }

  // If no listener was provided, remove all listeners for type
  if (!fn) {
    removeType(elem, type);
    return;
  }

  // We're only removing a single handler
  if (fn.guid) {
    for (let n = 0; n < handlers.length; n++) {
      if (handlers[n].guid === fn.guid) {
        handlers.splice(n--, 1);
      }
    }
  }
  _cleanUpEvents(elem, type);
}

/**
 * Trigger an event for an element
 *
 * @param {Element|Object} elem
 *        Element to trigger an event on
 *
 * @param {EventTarget~Event|string} event
 *        A string (the type) or an event object with a type attribute
 *
 * @param {Object} [hash]
 *        data hash to pass along with the event
 *
 * @return {boolean|undefined}
 *         Returns the opposite of `defaultPrevented` if default was
 *         prevented. Otherwise, returns `undefined`
 */
function trigger(elem, event, hash) {
  // Fetches element data and a reference to the parent (for bubbling).
  // Don't want to add a data object to cache for every parent,
  // so checking hasElData first.
  const elemData = DomData.has(elem) ? DomData.get(elem) : {};
  const parent = elem.parentNode || elem.ownerDocument;
  // type = event.type || event,
  // handler;

  // If an event name was passed as a string, creates an event out of it
  if (typeof event === 'string') {
    event = {
      type: event,
      target: elem
    };
  } else if (!event.target) {
    event.target = elem;
  }

  // Normalizes the event properties.
  event = fixEvent(event);

  // If the passed element has a dispatcher, executes the established handlers.
  if (elemData.dispatcher) {
    elemData.dispatcher.call(elem, event, hash);
  }

  // Unless explicitly stopped or the event does not bubble (e.g. media events)
  // recursively calls this function to bubble the event up the DOM.
  if (parent && !event.isPropagationStopped() && event.bubbles === true) {
    trigger.call(null, parent, event, hash);

    // If at the top of the DOM, triggers the default action unless disabled.
  } else if (!parent && !event.defaultPrevented && event.target && event.target[event.type]) {
    if (!DomData.has(event.target)) {
      DomData.set(event.target, {});
    }
    const targetData = DomData.get(event.target);

    // Checks if the target has a default action for this event.
    if (event.target[event.type]) {
      // Temporarily disables event dispatching on the target as we have already executed the handler.
      targetData.disabled = true;
      // Executes the default action.
      if (typeof event.target[event.type] === 'function') {
        event.target[event.type]();
      }
      // Re-enables event dispatching.
      targetData.disabled = false;
    }
  }

  // Inform the triggerer if the default was prevented by returning false
  return !event.defaultPrevented;
}

/**
 * Trigger a listener only once for an event.
 *
 * @param {Element|Object} elem
 *        Element or object to bind to.
 *
 * @param {string|string[]} type
 *        Name/type of event
 *
 * @param {Event~EventListener} fn
 *        Event listener function
 */
function one(elem, type, fn) {
  if (Array.isArray(type)) {
    return _handleMultipleEvents(one, elem, type, fn);
  }
  const func = function () {
    off(elem, type, func);
    fn.apply(this, arguments);
  };

  // copy the guid to the new function so it can removed using the original function's ID
  func.guid = fn.guid = fn.guid || newGUID();
  on(elem, type, func);
}

/**
 * Trigger a listener only once and then turn if off for all
 * configured events
 *
 * @param {Element|Object} elem
 *        Element or object to bind to.
 *
 * @param {string|string[]} type
 *        Name/type of event
 *
 * @param {Event~EventListener} fn
 *        Event listener function
 */
function any(elem, type, fn) {
  const func = function () {
    off(elem, type, func);
    fn.apply(this, arguments);
  };

  // copy the guid to the new function so it can removed using the original function's ID
  func.guid = fn.guid = fn.guid || newGUID();

  // multiple ons, but one off for everything
  on(elem, type, func);
}

var Events = /*#__PURE__*/Object.freeze({
  __proto__: null,
  fixEvent: fixEvent,
  on: on,
  off: off,
  trigger: trigger,
  one: one,
  any: any
});

/**
 * @file fn.js
 * @module fn
 */
const UPDATE_REFRESH_INTERVAL = 30;

/**
 * A private, internal-only function for changing the context of a function.
 *
 * It also stores a unique id on the function so it can be easily removed from
 * events.
 *
 * @private
 * @function
 * @param    {*} context
 *           The object to bind as scope.
 *
 * @param    {Function} fn
 *           The function to be bound to a scope.
 *
 * @param    {number} [uid]
 *           An optional unique ID for the function to be set
 *
 * @return   {Function}
 *           The new function that will be bound into the context given
 */
const bind_ = function (context, fn, uid) {
  // Make sure the function has a unique ID
  if (!fn.guid) {
    fn.guid = newGUID();
  }

  // Create the new function that changes the context
  const bound = fn.bind(context);

  // Allow for the ability to individualize this function
  // Needed in the case where multiple objects might share the same prototype
  // IF both items add an event listener with the same function, then you try to remove just one
  // it will remove both because they both have the same guid.
  // when using this, you need to use the bind method when you remove the listener as well.
  // currently used in text tracks
  bound.guid = uid ? uid + '_' + fn.guid : fn.guid;
  return bound;
};

/**
 * Wraps the given function, `fn`, with a new function that only invokes `fn`
 * at most once per every `wait` milliseconds.
 *
 * @function
 * @param    {Function} fn
 *           The function to be throttled.
 *
 * @param    {number}   wait
 *           The number of milliseconds by which to throttle.
 *
 * @return   {Function}
 */
const throttle = function (fn, wait) {
  let last = window.performance.now();
  const throttled = function (...args) {
    const now = window.performance.now();
    if (now - last >= wait) {
      fn(...args);
      last = now;
    }
  };
  return throttled;
};

/**
 * Creates a debounced function that delays invoking `func` until after `wait`
 * milliseconds have elapsed since the last time the debounced function was
 * invoked.
 *
 * Inspired by lodash and underscore implementations.
 *
 * @function
 * @param    {Function} func
 *           The function to wrap with debounce behavior.
 *
 * @param    {number} wait
 *           The number of milliseconds to wait after the last invocation.
 *
 * @param    {boolean} [immediate]
 *           Whether or not to invoke the function immediately upon creation.
 *
 * @param    {Object} [context=window]
 *           The "context" in which the debounced function should debounce. For
 *           example, if this function should be tied to a Video.js player,
 *           the player can be passed here. Alternatively, defaults to the
 *           global `window` object.
 *
 * @return   {Function}
 *           A debounced function.
 */
const debounce = function (func, wait, immediate, context = window) {
  let timeout;
  const cancel = () => {
    context.clearTimeout(timeout);
    timeout = null;
  };

  /* eslint-disable consistent-this */
  const debounced = function () {
    const self = this;
    const args = arguments;
    let later = function () {
      timeout = null;
      later = null;
      if (!immediate) {
        func.apply(self, args);
      }
    };
    if (!timeout && immediate) {
      func.apply(self, args);
    }
    context.clearTimeout(timeout);
    timeout = context.setTimeout(later, wait);
  };
  /* eslint-enable consistent-this */

  debounced.cancel = cancel;
  return debounced;
};

var Fn = /*#__PURE__*/Object.freeze({
  __proto__: null,
  UPDATE_REFRESH_INTERVAL: UPDATE_REFRESH_INTERVAL,
  bind_: bind_,
  throttle: throttle,
  debounce: debounce
});

/**
 * @file src/js/event-target.js
 */
let EVENT_MAP;

/**
 * `EventTarget` is a class that can have the same API as the DOM `EventTarget`. It
 * adds shorthand functions that wrap around lengthy functions. For example:
 * the `on` function is a wrapper around `addEventListener`.
 *
 * @see [EventTarget Spec]{@link https://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-EventTarget}
 * @class EventTarget
 */
class EventTarget {
  /**
   * Adds an `event listener` to an instance of an `EventTarget`. An `event listener` is a
   * function that will get called when an event with a certain name gets triggered.
   *
   * @param {string|string[]} type
   *        An event name or an array of event names.
   *
   * @param {Function} fn
   *        The function to call with `EventTarget`s
   */
  on(type, fn) {
    // Remove the addEventListener alias before calling Events.on
    // so we don't get into an infinite type loop
    const ael = this.addEventListener;
    this.addEventListener = () => {};
    on(this, type, fn);
    this.addEventListener = ael;
  }
  /**
   * Removes an `event listener` for a specific event from an instance of `EventTarget`.
   * This makes it so that the `event listener` will no longer get called when the
   * named event happens.
   *
   * @param {string|string[]} type
   *        An event name or an array of event names.
   *
   * @param {Function} fn
   *        The function to remove.
   */
  off(type, fn) {
    off(this, type, fn);
  }
  /**
   * This function will add an `event listener` that gets triggered only once. After the
   * first trigger it will get removed. This is like adding an `event listener`
   * with {@link EventTarget#on} that calls {@link EventTarget#off} on itself.
   *
   * @param {string|string[]} type
   *        An event name or an array of event names.
   *
   * @param {Function} fn
   *        The function to be called once for each event name.
   */
  one(type, fn) {
    // Remove the addEventListener aliasing Events.on
    // so we don't get into an infinite type loop
    const ael = this.addEventListener;
    this.addEventListener = () => {};
    one(this, type, fn);
    this.addEventListener = ael;
  }
  /**
   * This function will add an `event listener` that gets triggered only once and is
   * removed from all events. This is like adding an array of `event listener`s
   * with {@link EventTarget#on} that calls {@link EventTarget#off} on all events the
   * first time it is triggered.
   *
   * @param {string|string[]} type
   *        An event name or an array of event names.
   *
   * @param {Function} fn
   *        The function to be called once for each event name.
   */
  any(type, fn) {
    // Remove the addEventListener aliasing Events.on
    // so we don't get into an infinite type loop
    const ael = this.addEventListener;
    this.addEventListener = () => {};
    any(this, type, fn);
    this.addEventListener = ael;
  }
  /**
   * This function causes an event to happen. This will then cause any `event listeners`
   * that are waiting for that event, to get called. If there are no `event listeners`
   * for an event then nothing will happen.
   *
   * If the name of the `Event` that is being triggered is in `EventTarget.allowedEvents_`.
   * Trigger will also call the `on` + `uppercaseEventName` function.
   *
   * Example:
   * 'click' is in `EventTarget.allowedEvents_`, so, trigger will attempt to call
   * `onClick` if it exists.
   *
   * @param {string|EventTarget~Event|Object} event
   *        The name of the event, an `Event`, or an object with a key of type set to
   *        an event name.
   */
  trigger(event) {
    const type = event.type || event;

    // deprecation
    // In a future version we should default target to `this`
    // similar to how we default the target to `elem` in
    // `Events.trigger`. Right now the default `target` will be
    // `document` due to the `Event.fixEvent` call.
    if (typeof event === 'string') {
      event = {
        type
      };
    }
    event = fixEvent(event);
    if (this.allowedEvents_[type] && this['on' + type]) {
      this['on' + type](event);
    }
    trigger(this, event);
  }
  queueTrigger(event) {
    // only set up EVENT_MAP if it'll be used
    if (!EVENT_MAP) {
      EVENT_MAP = new Map();
    }
    const type = event.type || event;
    let map = EVENT_MAP.get(this);
    if (!map) {
      map = new Map();
      EVENT_MAP.set(this, map);
    }
    const oldTimeout = map.get(type);
    map.delete(type);
    window.clearTimeout(oldTimeout);
    const timeout = window.setTimeout(() => {
      map.delete(type);
      // if we cleared out all timeouts for the current target, delete its map
      if (map.size === 0) {
        map = null;
        EVENT_MAP.delete(this);
      }
      this.trigger(event);
    }, 0);
    map.set(type, timeout);
  }
}

/**
 * A Custom DOM event.
 *
 * @typedef {CustomEvent} Event
 * @see [Properties]{@link https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent}
 */

/**
 * All event listeners should follow the following format.
 *
 * @callback EventTarget~EventListener
 * @this {EventTarget}
 *
 * @param {Event} event
 *        the event that triggered this function
 *
 * @param {Object} [hash]
 *        hash of data sent during the event
 */

/**
 * An object containing event names as keys and booleans as values.
 *
 * > NOTE: If an event name is set to a true value here {@link EventTarget#trigger}
 *         will have extra functionality. See that function for more information.
 *
 * @property EventTarget.prototype.allowedEvents_
 * @private
 */
EventTarget.prototype.allowedEvents_ = {};

/**
 * An alias of {@link EventTarget#on}. Allows `EventTarget` to mimic
 * the standard DOM API.
 *
 * @function
 * @see {@link EventTarget#on}
 */
EventTarget.prototype.addEventListener = EventTarget.prototype.on;

/**
 * An alias of {@link EventTarget#off}. Allows `EventTarget` to mimic
 * the standard DOM API.
 *
 * @function
 * @see {@link EventTarget#off}
 */
EventTarget.prototype.removeEventListener = EventTarget.prototype.off;

/**
 * An alias of {@link EventTarget#trigger}. Allows `EventTarget` to mimic
 * the standard DOM API.
 *
 * @function
 * @see {@link EventTarget#trigger}
 */
EventTarget.prototype.dispatchEvent = EventTarget.prototype.trigger;

/**
 * @file mixins/evented.js
 * @module evented
 */
const objName = obj => {
  if (typeof obj.name === 'function') {
    return obj.name();
  }
  if (typeof obj.name === 'string') {
    return obj.name;
  }
  if (obj.name_) {
    return obj.name_;
  }
  if (obj.constructor && obj.constructor.name) {
    return obj.constructor.name;
  }
  return typeof obj;
};

/**
 * Returns whether or not an object has had the evented mixin applied.
 *
 * @param  {Object} object
 *         An object to test.
 *
 * @return {boolean}
 *         Whether or not the object appears to be evented.
 */
const isEvented = object => object instanceof EventTarget || !!object.eventBusEl_ && ['on', 'one', 'off', 'trigger'].every(k => typeof object[k] === 'function');

/**
 * Adds a callback to run after the evented mixin applied.
 *
 * @param  {Object} object
 *         An object to Add
 * @param  {Function} callback
 *         The callback to run.
 */
const addEventedCallback = (target, callback) => {
  if (isEvented(target)) {
    callback();
  } else {
    if (!target.eventedCallbacks) {
      target.eventedCallbacks = [];
    }
    target.eventedCallbacks.push(callback);
  }
};

/**
 * Whether a value is a valid event type - non-empty string or array.
 *
 * @private
 * @param  {string|Array} type
 *         The type value to test.
 *
 * @return {boolean}
 *         Whether or not the type is a valid event type.
 */
const isValidEventType = type =>
// The regex here verifies that the `type` contains at least one non-
// whitespace character.
typeof type === 'string' && /\S/.test(type) || Array.isArray(type) && !!type.length;

/**
 * Validates a value to determine if it is a valid event target. Throws if not.
 *
 * @private
 * @throws {Error}
 *         If the target does not appear to be a valid event target.
 *
 * @param  {Object} target
 *         The object to test.
 *
 * @param  {Object} obj
 *         The evented object we are validating for
 *
 * @param  {string} fnName
 *         The name of the evented mixin function that called this.
 */
const validateTarget = (target, obj, fnName) => {
  if (!target || !target.nodeName && !isEvented(target)) {
    throw new Error(`Invalid target for ${objName(obj)}#${fnName}; must be a DOM node or evented object.`);
  }
};

/**
 * Validates a value to determine if it is a valid event target. Throws if not.
 *
 * @private
 * @throws {Error}
 *         If the type does not appear to be a valid event type.
 *
 * @param  {string|Array} type
 *         The type to test.
 *
 * @param  {Object} obj
*         The evented object we are validating for
 *
 * @param  {string} fnName
 *         The name of the evented mixin function that called this.
 */
const validateEventType = (type, obj, fnName) => {
  if (!isValidEventType(type)) {
    throw new Error(`Invalid event type for ${objName(obj)}#${fnName}; must be a non-empty string or array.`);
  }
};

/**
 * Validates a value to determine if it is a valid listener. Throws if not.
 *
 * @private
 * @throws {Error}
 *         If the listener is not a function.
 *
 * @param  {Function} listener
 *         The listener to test.
 *
 * @param  {Object} obj
 *         The evented object we are validating for
 *
 * @param  {string} fnName
 *         The name of the evented mixin function that called this.
 */
const validateListener = (listener, obj, fnName) => {
  if (typeof listener !== 'function') {
    throw new Error(`Invalid listener for ${objName(obj)}#${fnName}; must be a function.`);
  }
};

/**
 * Takes an array of arguments given to `on()` or `one()`, validates them, and
 * normalizes them into an object.
 *
 * @private
 * @param  {Object} self
 *         The evented object on which `on()` or `one()` was called. This
 *         object will be bound as the `this` value for the listener.
 *
 * @param  {Array} args
 *         An array of arguments passed to `on()` or `one()`.
 *
 * @param  {string} fnName
 *         The name of the evented mixin function that called this.
 *
 * @return {Object}
 *         An object containing useful values for `on()` or `one()` calls.
 */
const normalizeListenArgs = (self, args, fnName) => {
  // If the number of arguments is less than 3, the target is always the
  // evented object itself.
  const isTargetingSelf = args.length < 3 || args[0] === self || args[0] === self.eventBusEl_;
  let target;
  let type;
  let listener;
  if (isTargetingSelf) {
    target = self.eventBusEl_;

    // Deal with cases where we got 3 arguments, but we are still listening to
    // the evented object itself.
    if (args.length >= 3) {
      args.shift();
    }
    [type, listener] = args;
  } else {
    [target, type, listener] = args;
  }
  validateTarget(target, self, fnName);
  validateEventType(type, self, fnName);
  validateListener(listener, self, fnName);
  listener = bind_(self, listener);
  return {
    isTargetingSelf,
    target,
    type,
    listener
  };
};

/**
 * Adds the listener to the event type(s) on the target, normalizing for
 * the type of target.
 *
 * @private
 * @param  {Element|Object} target
 *         A DOM node or evented object.
 *
 * @param  {string} method
 *         The event binding method to use ("on" or "one").
 *
 * @param  {string|Array} type
 *         One or more event type(s).
 *
 * @param  {Function} listener
 *         A listener function.
 */
const listen = (target, method, type, listener) => {
  validateTarget(target, target, method);
  if (target.nodeName) {
    Events[method](target, type, listener);
  } else {
    target[method](type, listener);
  }
};

/**
 * Contains methods that provide event capabilities to an object which is passed
 * to {@link module:evented|evented}.
 *
 * @mixin EventedMixin
 */
const EventedMixin = {
  /**
   * Add a listener to an event (or events) on this object or another evented
   * object.
   *
   * @param  {string|Array|Element|Object} targetOrType
   *         If this is a string or array, it represents the event type(s)
   *         that will trigger the listener.
   *
   *         Another evented object can be passed here instead, which will
   *         cause the listener to listen for events on _that_ object.
   *
   *         In either case, the listener's `this` value will be bound to
   *         this object.
   *
   * @param  {string|Array|Function} typeOrListener
   *         If the first argument was a string or array, this should be the
   *         listener function. Otherwise, this is a string or array of event
   *         type(s).
   *
   * @param  {Function} [listener]
   *         If the first argument was another evented object, this will be
   *         the listener function.
   */
  on(...args) {
    const {
      isTargetingSelf,
      target,
      type,
      listener
    } = normalizeListenArgs(this, args, 'on');
    listen(target, 'on', type, listener);

    // If this object is listening to another evented object.
    if (!isTargetingSelf) {
      // If this object is disposed, remove the listener.
      const removeListenerOnDispose = () => this.off(target, type, listener);

      // Use the same function ID as the listener so we can remove it later it
      // using the ID of the original listener.
      removeListenerOnDispose.guid = listener.guid;

      // Add a listener to the target's dispose event as well. This ensures
      // that if the target is disposed BEFORE this object, we remove the
      // removal listener that was just added. Otherwise, we create a memory leak.
      const removeRemoverOnTargetDispose = () => this.off('dispose', removeListenerOnDispose);

      // Use the same function ID as the listener so we can remove it later
      // it using the ID of the original listener.
      removeRemoverOnTargetDispose.guid = listener.guid;
      listen(this, 'on', 'dispose', removeListenerOnDispose);
      listen(target, 'on', 'dispose', removeRemoverOnTargetDispose);
    }
  },
  /**
   * Add a listener to an event (or events) on this object or another evented
   * object. The listener will be called once per event and then removed.
   *
   * @param  {string|Array|Element|Object} targetOrType
   *         If this is a string or array, it represents the event type(s)
   *         that will trigger the listener.
   *
   *         Another evented object can be passed here instead, which will
   *         cause the listener to listen for events on _that_ object.
   *
   *         In either case, the listener's `this` value will be bound to
   *         this object.
   *
   * @param  {string|Array|Function} typeOrListener
   *         If the first argument was a string or array, this should be the
   *         listener function. Otherwise, this is a string or array of event
   *         type(s).
   *
   * @param  {Function} [listener]
   *         If the first argument was another evented object, this will be
   *         the listener function.
   */
  one(...args) {
    const {
      isTargetingSelf,
      target,
      type,
      listener
    } = normalizeListenArgs(this, args, 'one');

    // Targeting this evented object.
    if (isTargetingSelf) {
      listen(target, 'one', type, listener);

      // Targeting another evented object.
    } else {
      // TODO: This wrapper is incorrect! It should only
      //       remove the wrapper for the event type that called it.
      //       Instead all listeners are removed on the first trigger!
      //       see https://github.com/videojs/video.js/issues/5962
      const wrapper = (...largs) => {
        this.off(target, type, wrapper);
        listener.apply(null, largs);
      };

      // Use the same function ID as the listener so we can remove it later
      // it using the ID of the original listener.
      wrapper.guid = listener.guid;
      listen(target, 'one', type, wrapper);
    }
  },
  /**
   * Add a listener to an event (or events) on this object or another evented
   * object. The listener will only be called once for the first event that is triggered
   * then removed.
   *
   * @param  {string|Array|Element|Object} targetOrType
   *         If this is a string or array, it represents the event type(s)
   *         that will trigger the listener.
   *
   *         Another evented object can be passed here instead, which will
   *         cause the listener to listen for events on _that_ object.
   *
   *         In either case, the listener's `this` value will be bound to
   *         this object.
   *
   * @param  {string|Array|Function} typeOrListener
   *         If the first argument was a string or array, this should be the
   *         listener function. Otherwise, this is a string or array of event
   *         type(s).
   *
   * @param  {Function} [listener]
   *         If the first argument was another evented object, this will be
   *         the listener function.
   */
  any(...args) {
    const {
      isTargetingSelf,
      target,
      type,
      listener
    } = normalizeListenArgs(this, args, 'any');

    // Targeting this evented object.
    if (isTargetingSelf) {
      listen(target, 'any', type, listener);

      // Targeting another evented object.
    } else {
      const wrapper = (...largs) => {
        this.off(target, type, wrapper);
        listener.apply(null, largs);
      };

      // Use the same function ID as the listener so we can remove it later
      // it using the ID of the original listener.
      wrapper.guid = listener.guid;
      listen(target, 'any', type, wrapper);
    }
  },
  /**
   * Removes listener(s) from event(s) on an evented object.
   *
   * @param  {string|Array|Element|Object} [targetOrType]
   *         If this is a string or array, it represents the event type(s).
   *
   *         Another evented object can be passed here instead, in which case
   *         ALL 3 arguments are _required_.
   *
   * @param  {string|Array|Function} [typeOrListener]
   *         If the first argument was a string or array, this may be the
   *         listener function. Otherwise, this is a string or array of event
   *         type(s).
   *
   * @param  {Function} [listener]
   *         If the first argument was another evented object, this will be
   *         the listener function; otherwise, _all_ listeners bound to the
   *         event type(s) will be removed.
   */
  off(targetOrType, typeOrListener, listener) {
    // Targeting this evented object.
    if (!targetOrType || isValidEventType(targetOrType)) {
      off(this.eventBusEl_, targetOrType, typeOrListener);

      // Targeting another evented object.
    } else {
      const target = targetOrType;
      const type = typeOrListener;

      // Fail fast and in a meaningful way!
      validateTarget(target, this, 'off');
      validateEventType(type, this, 'off');
      validateListener(listener, this, 'off');

      // Ensure there's at least a guid, even if the function hasn't been used
      listener = bind_(this, listener);

      // Remove the dispose listener on this evented object, which was given
      // the same guid as the event listener in on().
      this.off('dispose', listener);
      if (target.nodeName) {
        off(target, type, listener);
        off(target, 'dispose', listener);
      } else if (isEvented(target)) {
        target.off(type, listener);
        target.off('dispose', listener);
      }
    }
  },
  /**
   * Fire an event on this evented object, causing its listeners to be called.
   *
   * @param   {string|Object} event
   *          An event type or an object with a type property.
   *
   * @param   {Object} [hash]
   *          An additional object to pass along to listeners.
   *
   * @return {boolean}
   *          Whether or not the default behavior was prevented.
   */
  trigger(event, hash) {
    validateTarget(this.eventBusEl_, this, 'trigger');
    const type = event && typeof event !== 'string' ? event.type : event;
    if (!isValidEventType(type)) {
      throw new Error(`Invalid event type for ${objName(this)}#trigger; ` + 'must be a non-empty string or object with a type key that has a non-empty value.');
    }
    return trigger(this.eventBusEl_, event, hash);
  }
};

/**
 * Applies {@link module:evented~EventedMixin|EventedMixin} to a target object.
 *
 * @param  {Object} target
 *         The object to which to add event methods.
 *
 * @param  {Object} [options={}]
 *         Options for customizing the mixin behavior.
 *
 * @param  {string} [options.eventBusKey]
 *         By default, adds a `eventBusEl_` DOM element to the target object,
 *         which is used as an event bus. If the target object already has a
 *         DOM element that should be used, pass its key here.
 *
 * @return {Object}
 *         The target object.
 */
function evented(target, options = {}) {
  const {
    eventBusKey
  } = options;

  // Set or create the eventBusEl_.
  if (eventBusKey) {
    if (!target[eventBusKey].nodeName) {
      throw new Error(`The eventBusKey "${eventBusKey}" does not refer to an element.`);
    }
    target.eventBusEl_ = target[eventBusKey];
  } else {
    target.eventBusEl_ = createEl('span', {
      className: 'vjs-event-bus'
    });
  }
  Object.assign(target, EventedMixin);
  if (target.eventedCallbacks) {
    target.eventedCallbacks.forEach(callback => {
      callback();
    });
  }

  // When any evented object is disposed, it removes all its listeners.
  target.on('dispose', () => {
    target.off();
    [target, target.el_, target.eventBusEl_].forEach(function (val) {
      if (val && DomData.has(val)) {
        DomData.delete(val);
      }
    });
    window.setTimeout(() => {
      target.eventBusEl_ = null;
    }, 0);
  });
  return target;
}

/**
 * @file mixins/stateful.js
 * @module stateful
 */

/**
 * Contains methods that provide statefulness to an object which is passed
 * to {@link module:stateful}.
 *
 * @mixin StatefulMixin
 */
const StatefulMixin = {
  /**
   * A hash containing arbitrary keys and values representing the state of
   * the object.
   *
   * @type {Object}
   */
  state: {},
  /**
   * Set the state of an object by mutating its
   * {@link module:stateful~StatefulMixin.state|state} object in place.
   *
   * @fires   module:stateful~StatefulMixin#statechanged
   * @param   {Object|Function} stateUpdates
   *          A new set of properties to shallow-merge into the plugin state.
   *          Can be a plain object or a function returning a plain object.
   *
   * @return {Object|undefined}
   *          An object containing changes that occurred. If no changes
   *          occurred, returns `undefined`.
   */
  setState(stateUpdates) {
    // Support providing the `stateUpdates` state as a function.
    if (typeof stateUpdates === 'function') {
      stateUpdates = stateUpdates();
    }
    let changes;
    each(stateUpdates, (value, key) => {
      // Record the change if the value is different from what's in the
      // current state.
      if (this.state[key] !== value) {
        changes = changes || {};
        changes[key] = {
          from: this.state[key],
          to: value
        };
      }
      this.state[key] = value;
    });

    // Only trigger "statechange" if there were changes AND we have a trigger
    // function. This allows us to not require that the target object be an
    // evented object.
    if (changes && isEvented(this)) {
      /**
       * An event triggered on an object that is both
       * {@link module:stateful|stateful} and {@link module:evented|evented}
       * indicating that its state has changed.
       *
       * @event    module:stateful~StatefulMixin#statechanged
       * @type     {Object}
       * @property {Object} changes
       *           A hash containing the properties that were changed and
       *           the values they were changed `from` and `to`.
       */
      this.trigger({
        changes,
        type: 'statechanged'
      });
    }
    return changes;
  }
};

/**
 * Applies {@link module:stateful~StatefulMixin|StatefulMixin} to a target
 * object.
 *
 * If the target object is {@link module:evented|evented} and has a
 * `handleStateChanged` method, that method will be automatically bound to the
 * `statechanged` event on itself.
 *
 * @param   {Object} target
 *          The object to be made stateful.
 *
 * @param   {Object} [defaultState]
 *          A default set of properties to populate the newly-stateful object's
 *          `state` property.
 *
 * @return {Object}
 *          Returns the `target`.
 */
function stateful(target, defaultState) {
  Object.assign(target, StatefulMixin);

  // This happens after the mixing-in because we need to replace the `state`
  // added in that step.
  target.state = Object.assign({}, target.state, defaultState);

  // Auto-bind the `handleStateChanged` method of the target object if it exists.
  if (typeof target.handleStateChanged === 'function' && isEvented(target)) {
    target.on('statechanged', target.handleStateChanged);
  }
  return target;
}

/**
 * @file str.js
 * @module to-lower-case
 */

/**
 * Lowercase the first letter of a string.
 *
 * @param {string} string
 *        String to be lowercased
 *
 * @return {string}
 *         The string with a lowercased first letter
 */
const toLowerCase = function (string) {
  if (typeof string !== 'string') {
    return string;
  }
  return string.replace(/./, w => w.toLowerCase());
};

/**
 * Uppercase the first letter of a string.
 *
 * @param {string} string
 *        String to be uppercased
 *
 * @return {string}
 *         The string with an uppercased first letter
 */
const toTitleCase = function (string) {
  if (typeof string !== 'string') {
    return string;
  }
  return string.replace(/./, w => w.toUpperCase());
};

/**
 * Compares the TitleCase versions of the two strings for equality.
 *
 * @param {string} str1
 *        The first string to compare
 *
 * @param {string} str2
 *        The second string to compare
 *
 * @return {boolean}
 *         Whether the TitleCase versions of the strings are equal
 */
const titleCaseEquals = function (str1, str2) {
  return toTitleCase(str1) === toTitleCase(str2);
};

var Str = /*#__PURE__*/Object.freeze({
  __proto__: null,
  toLowerCase: toLowerCase,
  toTitleCase: toTitleCase,
  titleCaseEquals: titleCaseEquals
});

/**
 * Player Component - Base class for all UI objects
 *
 * @file component.js
 */

/**
 * Base class for all UI Components.
 * Components are UI objects which represent both a javascript object and an element
 * in the DOM. They can be children of other components, and can have
 * children themselves.
 *
 * Components can also use methods from {@link EventTarget}
 */
class Component {
  /**
   * A callback that is called when a component is ready. Does not have any
   * parameters and any callback value will be ignored.
   *
   * @callback ReadyCallback
   * @this Component
   */

  /**
   * Creates an instance of this class.
   *
   * @param { import('./player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of component options.
   *
   * @param {Object[]} [options.children]
   *        An array of children objects to initialize this component with. Children objects have
   *        a name property that will be used if more than one component of the same type needs to be
   *        added.
   *
   * @param  {string} [options.className]
   *         A class or space separated list of classes to add the component
   *
   * @param {ReadyCallback} [ready]
   *        Function that gets called when the `Component` is ready.
   */
  constructor(player, options, ready) {
    // The component might be the player itself and we can't pass `this` to super
    if (!player && this.play) {
      this.player_ = player = this; // eslint-disable-line
    } else {
      this.player_ = player;
    }
    this.isDisposed_ = false;

    // Hold the reference to the parent component via `addChild` method
    this.parentComponent_ = null;

    // Make a copy of prototype.options_ to protect against overriding defaults
    this.options_ = merge({}, this.options_);

    // Updated options with supplied options
    options = this.options_ = merge(this.options_, options);

    // Get ID from options or options element if one is supplied
    this.id_ = options.id || options.el && options.el.id;

    // If there was no ID from the options, generate one
    if (!this.id_) {
      // Don't require the player ID function in the case of mock players
      const id = player && player.id && player.id() || 'no_player';
      this.id_ = `${id}_component_${newGUID()}`;
    }
    this.name_ = options.name || null;

    // Create element if one wasn't provided in options
    if (options.el) {
      this.el_ = options.el;
    } else if (options.createEl !== false) {
      this.el_ = this.createEl();
    }
    if (options.className && this.el_) {
      options.className.split(' ').forEach(c => this.addClass(c));
    }

    // Remove the placeholder event methods. If the component is evented, the
    // real methods are added next
    ['on', 'off', 'one', 'any', 'trigger'].forEach(fn => {
      this[fn] = undefined;
    });

    // if evented is anything except false, we want to mixin in evented
    if (options.evented !== false) {
      // Make this an evented object and use `el_`, if available, as its event bus
      evented(this, {
        eventBusKey: this.el_ ? 'el_' : null
      });
      this.handleLanguagechange = this.handleLanguagechange.bind(this);
      this.on(this.player_, 'languagechange', this.handleLanguagechange);
    }
    stateful(this, this.constructor.defaultState);
    this.children_ = [];
    this.childIndex_ = {};
    this.childNameIndex_ = {};
    this.setTimeoutIds_ = new Set();
    this.setIntervalIds_ = new Set();
    this.rafIds_ = new Set();
    this.namedRafs_ = new Map();
    this.clearingTimersOnDispose_ = false;

    // Add any child components in options
    if (options.initChildren !== false) {
      this.initChildren();
    }

    // Don't want to trigger ready here or it will go before init is actually
    // finished for all children that run this constructor
    this.ready(ready);
    if (options.reportTouchActivity !== false) {
      this.enableTouchActivity();
    }
  }

  // `on`, `off`, `one`, `any` and `trigger` are here so tsc includes them in definitions.
  // They are replaced or removed in the constructor

  /**
   * Adds an `event listener` to an instance of an `EventTarget`. An `event listener` is a
   * function that will get called when an event with a certain name gets triggered.
   *
   * @param {string|string[]} type
   *        An event name or an array of event names.
   *
   * @param {Function} fn
   *        The function to call with `EventTarget`s
   */
  on(type, fn) {}

  /**
   * Removes an `event listener` for a specific event from an instance of `EventTarget`.
   * This makes it so that the `event listener` will no longer get called when the
   * named event happens.
   *
   * @param {string|string[]} type
   *        An event name or an array of event names.
   *
   * @param {Function} fn
   *        The function to remove.
   */
  off(type, fn) {}

  /**
   * This function will add an `event listener` that gets triggered only once. After the
   * first trigger it will get removed. This is like adding an `event listener`
   * with {@link EventTarget#on} that calls {@link EventTarget#off} on itself.
   *
   * @param {string|string[]} type
   *        An event name or an array of event names.
   *
   * @param {Function} fn
   *        The function to be called once for each event name.
   */
  one(type, fn) {}

  /**
   * This function will add an `event listener` that gets triggered only once and is
   * removed from all events. This is like adding an array of `event listener`s
   * with {@link EventTarget#on} that calls {@link EventTarget#off} on all events the
   * first time it is triggered.
   *
   * @param {string|string[]} type
   *        An event name or an array of event names.
   *
   * @param {Function} fn
   *        The function to be called once for each event name.
   */
  any(type, fn) {}

  /**
   * This function causes an event to happen. This will then cause any `event listeners`
   * that are waiting for that event, to get called. If there are no `event listeners`
   * for an event then nothing will happen.
   *
   * If the name of the `Event` that is being triggered is in `EventTarget.allowedEvents_`.
   * Trigger will also call the `on` + `uppercaseEventName` function.
   *
   * Example:
   * 'click' is in `EventTarget.allowedEvents_`, so, trigger will attempt to call
   * `onClick` if it exists.
   *
   * @param {string|Event|Object} event
   *        The name of the event, an `Event`, or an object with a key of type set to
   *        an event name.
   */
  trigger(event) {}

  /**
   * Dispose of the `Component` and all child components.
   *
   * @fires Component#dispose
   *
   * @param {Object} options
   * @param {Element} options.originalEl element with which to replace player element
   */
  dispose(options = {}) {
    // Bail out if the component has already been disposed.
    if (this.isDisposed_) {
      return;
    }
    if (this.readyQueue_) {
      this.readyQueue_.length = 0;
    }

    /**
     * Triggered when a `Component` is disposed.
     *
     * @event Component#dispose
     * @type {Event}
     *
     * @property {boolean} [bubbles=false]
     *           set to false so that the dispose event does not
     *           bubble up
     */
    this.trigger({
      type: 'dispose',
      bubbles: false
    });
    this.isDisposed_ = true;

    // Dispose all children.
    if (this.children_) {
      for (let i = this.children_.length - 1; i >= 0; i--) {
        if (this.children_[i].dispose) {
          this.children_[i].dispose();
        }
      }
    }

    // Delete child references
    this.children_ = null;
    this.childIndex_ = null;
    this.childNameIndex_ = null;
    this.parentComponent_ = null;
    if (this.el_) {
      // Remove element from DOM
      if (this.el_.parentNode) {
        if (options.restoreEl) {
          this.el_.parentNode.replaceChild(options.restoreEl, this.el_);
        } else {
          this.el_.parentNode.removeChild(this.el_);
        }
      }
      this.el_ = null;
    }

    // remove reference to the player after disposing of the element
    this.player_ = null;
  }

  /**
   * Determine whether or not this component has been disposed.
   *
   * @return {boolean}
   *         If the component has been disposed, will be `true`. Otherwise, `false`.
   */
  isDisposed() {
    return Boolean(this.isDisposed_);
  }

  /**
   * Return the {@link Player} that the `Component` has attached to.
   *
   * @return { import('./player').default }
   *         The player that this `Component` has attached to.
   */
  player() {
    return this.player_;
  }

  /**
   * Deep merge of options objects with new options.
   * > Note: When both `obj` and `options` contain properties whose values are objects.
   *         The two properties get merged using {@link module:obj.merge}
   *
   * @param {Object} obj
   *        The object that contains new options.
   *
   * @return {Object}
   *         A new object of `this.options_` and `obj` merged together.
   */
  options(obj) {
    if (!obj) {
      return this.options_;
    }
    this.options_ = merge(this.options_, obj);
    return this.options_;
  }

  /**
   * Get the `Component`s DOM element
   *
   * @return {Element}
   *         The DOM element for this `Component`.
   */
  el() {
    return this.el_;
  }

  /**
   * Create the `Component`s DOM element.
   *
   * @param {string} [tagName]
   *        Element's DOM node type. e.g. 'div'
   *
   * @param {Object} [properties]
   *        An object of properties that should be set.
   *
   * @param {Object} [attributes]
   *        An object of attributes that should be set.
   *
   * @return {Element}
   *         The element that gets created.
   */
  createEl(tagName, properties, attributes) {
    return createEl(tagName, properties, attributes);
  }

  /**
   * Localize a string given the string in english.
   *
   * If tokens are provided, it'll try and run a simple token replacement on the provided string.
   * The tokens it looks for look like `{1}` with the index being 1-indexed into the tokens array.
   *
   * If a `defaultValue` is provided, it'll use that over `string`,
   * if a value isn't found in provided language files.
   * This is useful if you want to have a descriptive key for token replacement
   * but have a succinct localized string and not require `en.json` to be included.
   *
   * Currently, it is used for the progress bar timing.
   * ```js
   * {
   *   "progress bar timing: currentTime={1} duration={2}": "{1} of {2}"
   * }
   * ```
   * It is then used like so:
   * ```js
   * this.localize('progress bar timing: currentTime={1} duration{2}',
   *               [this.player_.currentTime(), this.player_.duration()],
   *               '{1} of {2}');
   * ```
   *
   * Which outputs something like: `01:23 of 24:56`.
   *
   *
   * @param {string} string
   *        The string to localize and the key to lookup in the language files.
   * @param {string[]} [tokens]
   *        If the current item has token replacements, provide the tokens here.
   * @param {string} [defaultValue]
   *        Defaults to `string`. Can be a default value to use for token replacement
   *        if the lookup key is needed to be separate.
   *
   * @return {string}
   *         The localized string or if no localization exists the english string.
   */
  localize(string, tokens, defaultValue = string) {
    const code = this.player_.language && this.player_.language();
    const languages = this.player_.languages && this.player_.languages();
    const language = languages && languages[code];
    const primaryCode = code && code.split('-')[0];
    const primaryLang = languages && languages[primaryCode];
    let localizedString = defaultValue;
    if (language && language[string]) {
      localizedString = language[string];
    } else if (primaryLang && primaryLang[string]) {
      localizedString = primaryLang[string];
    }
    if (tokens) {
      localizedString = localizedString.replace(/\{(\d+)\}/g, function (match, index) {
        const value = tokens[index - 1];
        let ret = value;
        if (typeof value === 'undefined') {
          ret = match;
        }
        return ret;
      });
    }
    return localizedString;
  }

  /**
   * Handles language change for the player in components. Should be overridden by sub-components.
   *
   * @abstract
   */
  handleLanguagechange() {}

  /**
   * Return the `Component`s DOM element. This is where children get inserted.
   * This will usually be the the same as the element returned in {@link Component#el}.
   *
   * @return {Element}
   *         The content element for this `Component`.
   */
  contentEl() {
    return this.contentEl_ || this.el_;
  }

  /**
   * Get this `Component`s ID
   *
   * @return {string}
   *         The id of this `Component`
   */
  id() {
    return this.id_;
  }

  /**
   * Get the `Component`s name. The name gets used to reference the `Component`
   * and is set during registration.
   *
   * @return {string}
   *         The name of this `Component`.
   */
  name() {
    return this.name_;
  }

  /**
   * Get an array of all child components
   *
   * @return {Array}
   *         The children
   */
  children() {
    return this.children_;
  }

  /**
   * Returns the child `Component` with the given `id`.
   *
   * @param {string} id
   *        The id of the child `Component` to get.
   *
   * @return {Component|undefined}
   *         The child `Component` with the given `id` or undefined.
   */
  getChildById(id) {
    return this.childIndex_[id];
  }

  /**
   * Returns the child `Component` with the given `name`.
   *
   * @param {string} name
   *        The name of the child `Component` to get.
   *
   * @return {Component|undefined}
   *         The child `Component` with the given `name` or undefined.
   */
  getChild(name) {
    if (!name) {
      return;
    }
    return this.childNameIndex_[name];
  }

  /**
   * Returns the descendant `Component` following the givent
   * descendant `names`. For instance ['foo', 'bar', 'baz'] would
   * try to get 'foo' on the current component, 'bar' on the 'foo'
   * component and 'baz' on the 'bar' component and return undefined
   * if any of those don't exist.
   *
   * @param {...string[]|...string} names
   *        The name of the child `Component` to get.
   *
   * @return {Component|undefined}
   *         The descendant `Component` following the given descendant
   *         `names` or undefined.
   */
  getDescendant(...names) {
    // flatten array argument into the main array
    names = names.reduce((acc, n) => acc.concat(n), []);
    let currentChild = this;
    for (let i = 0; i < names.length; i++) {
      currentChild = currentChild.getChild(names[i]);
      if (!currentChild || !currentChild.getChild) {
        return;
      }
    }
    return currentChild;
  }

  /**
   * Add a child `Component` inside the current `Component`.
   *
   *
   * @param {string|Component} child
   *        The name or instance of a child to add.
   *
   * @param {Object} [options={}]
   *        The key/value store of options that will get passed to children of
   *        the child.
   *
   * @param {number} [index=this.children_.length]
   *        The index to attempt to add a child into.
   *
   * @return {Component}
   *         The `Component` that gets added as a child. When using a string the
   *         `Component` will get created by this process.
   */
  addChild(child, options = {}, index = this.children_.length) {
    let component;
    let componentName;

    // If child is a string, create component with options
    if (typeof child === 'string') {
      componentName = toTitleCase(child);
      const componentClassName = options.componentClass || componentName;

      // Set name through options
      options.name = componentName;

      // Create a new object & element for this controls set
      // If there's no .player_, this is a player
      const ComponentClass = Component.getComponent(componentClassName);
      if (!ComponentClass) {
        throw new Error(`Component ${componentClassName} does not exist`);
      }

      // data stored directly on the videojs object may be
      // misidentified as a component to retain
      // backwards-compatibility with 4.x. check to make sure the
      // component class can be instantiated.
      if (typeof ComponentClass !== 'function') {
        return null;
      }
      component = new ComponentClass(this.player_ || this, options);

      // child is a component instance
    } else {
      component = child;
    }
    if (component.parentComponent_) {
      component.parentComponent_.removeChild(component);
    }
    this.children_.splice(index, 0, component);
    component.parentComponent_ = this;
    if (typeof component.id === 'function') {
      this.childIndex_[component.id()] = component;
    }

    // If a name wasn't used to create the component, check if we can use the
    // name function of the component
    componentName = componentName || component.name && toTitleCase(component.name());
    if (componentName) {
      this.childNameIndex_[componentName] = component;
      this.childNameIndex_[toLowerCase(componentName)] = component;
    }

    // Add the UI object's element to the container div (box)
    // Having an element is not required
    if (typeof component.el === 'function' && component.el()) {
      // If inserting before a component, insert before that component's element
      let refNode = null;
      if (this.children_[index + 1]) {
        // Most children are components, but the video tech is an HTML element
        if (this.children_[index + 1].el_) {
          refNode = this.children_[index + 1].el_;
        } else if (isEl(this.children_[index + 1])) {
          refNode = this.children_[index + 1];
        }
      }
      this.contentEl().insertBefore(component.el(), refNode);
    }

    // Return so it can stored on parent object if desired.
    return component;
  }

  /**
   * Remove a child `Component` from this `Component`s list of children. Also removes
   * the child `Component`s element from this `Component`s element.
   *
   * @param {Component} component
   *        The child `Component` to remove.
   */
  removeChild(component) {
    if (typeof component === 'string') {
      component = this.getChild(component);
    }
    if (!component || !this.children_) {
      return;
    }
    let childFound = false;
    for (let i = this.children_.length - 1; i >= 0; i--) {
      if (this.children_[i] === component) {
        childFound = true;
        this.children_.splice(i, 1);
        break;
      }
    }
    if (!childFound) {
      return;
    }
    component.parentComponent_ = null;
    this.childIndex_[component.id()] = null;
    this.childNameIndex_[toTitleCase(component.name())] = null;
    this.childNameIndex_[toLowerCase(component.name())] = null;
    const compEl = component.el();
    if (compEl && compEl.parentNode === this.contentEl()) {
      this.contentEl().removeChild(component.el());
    }
  }

  /**
   * Add and initialize default child `Component`s based upon options.
   */
  initChildren() {
    const children = this.options_.children;
    if (children) {
      // `this` is `parent`
      const parentOptions = this.options_;
      const handleAdd = child => {
        const name = child.name;
        let opts = child.opts;

        // Allow options for children to be set at the parent options
        // e.g. videojs(id, { controlBar: false });
        // instead of videojs(id, { children: { controlBar: false });
        if (parentOptions[name] !== undefined) {
          opts = parentOptions[name];
        }

        // Allow for disabling default components
        // e.g. options['children']['posterImage'] = false
        if (opts === false) {
          return;
        }

        // Allow options to be passed as a simple boolean if no configuration
        // is necessary.
        if (opts === true) {
          opts = {};
        }

        // We also want to pass the original player options
        // to each component as well so they don't need to
        // reach back into the player for options later.
        opts.playerOptions = this.options_.playerOptions;

        // Create and add the child component.
        // Add a direct reference to the child by name on the parent instance.
        // If two of the same component are used, different names should be supplied
        // for each
        const newChild = this.addChild(name, opts);
        if (newChild) {
          this[name] = newChild;
        }
      };

      // Allow for an array of children details to passed in the options
      let workingChildren;
      const Tech = Component.getComponent('Tech');
      if (Array.isArray(children)) {
        workingChildren = children;
      } else {
        workingChildren = Object.keys(children);
      }
      workingChildren
      // children that are in this.options_ but also in workingChildren  would
      // give us extra children we do not want. So, we want to filter them out.
      .concat(Object.keys(this.options_).filter(function (child) {
        return !workingChildren.some(function (wchild) {
          if (typeof wchild === 'string') {
            return child === wchild;
          }
          return child === wchild.name;
        });
      })).map(child => {
        let name;
        let opts;
        if (typeof child === 'string') {
          name = child;
          opts = children[name] || this.options_[name] || {};
        } else {
          name = child.name;
          opts = child;
        }
        return {
          name,
          opts
        };
      }).filter(child => {
        // we have to make sure that child.name isn't in the techOrder since
        // techs are registered as Components but can't aren't compatible
        // See https://github.com/videojs/video.js/issues/2772
        const c = Component.getComponent(child.opts.componentClass || toTitleCase(child.name));
        return c && !Tech.isTech(c);
      }).forEach(handleAdd);
    }
  }

  /**
   * Builds the default DOM class name. Should be overridden by sub-components.
   *
   * @return {string}
   *         The DOM class name for this object.
   *
   * @abstract
   */
  buildCSSClass() {
    // Child classes can include a function that does:
    // return 'CLASS NAME' + this._super();
    return '';
  }

  /**
   * Bind a listener to the component's ready state.
   * Different from event listeners in that if the ready event has already happened
   * it will trigger the function immediately.
   *
   * @param {ReadyCallback} fn
   *        Function that gets called when the `Component` is ready.
   *
   * @return {Component}
   *         Returns itself; method can be chained.
   */
  ready(fn, sync = false) {
    if (!fn) {
      return;
    }
    if (!this.isReady_) {
      this.readyQueue_ = this.readyQueue_ || [];
      this.readyQueue_.push(fn);
      return;
    }
    if (sync) {
      fn.call(this);
    } else {
      // Call the function asynchronously by default for consistency
      this.setTimeout(fn, 1);
    }
  }

  /**
   * Trigger all the ready listeners for this `Component`.
   *
   * @fires Component#ready
   */
  triggerReady() {
    this.isReady_ = true;

    // Ensure ready is triggered asynchronously
    this.setTimeout(function () {
      const readyQueue = this.readyQueue_;

      // Reset Ready Queue
      this.readyQueue_ = [];
      if (readyQueue && readyQueue.length > 0) {
        readyQueue.forEach(function (fn) {
          fn.call(this);
        }, this);
      }

      // Allow for using event listeners also
      /**
       * Triggered when a `Component` is ready.
       *
       * @event Component#ready
       * @type {Event}
       */
      this.trigger('ready');
    }, 1);
  }

  /**
   * Find a single DOM element matching a `selector`. This can be within the `Component`s
   * `contentEl()` or another custom context.
   *
   * @param {string} selector
   *        A valid CSS selector, which will be passed to `querySelector`.
   *
   * @param {Element|string} [context=this.contentEl()]
   *        A DOM element within which to query. Can also be a selector string in
   *        which case the first matching element will get used as context. If
   *        missing `this.contentEl()` gets used. If  `this.contentEl()` returns
   *        nothing it falls back to `document`.
   *
   * @return {Element|null}
   *         the dom element that was found, or null
   *
   * @see [Information on CSS Selectors](https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Getting_Started/Selectors)
   */
  $(selector, context) {
    return $(selector, context || this.contentEl());
  }

  /**
   * Finds all DOM element matching a `selector`. This can be within the `Component`s
   * `contentEl()` or another custom context.
   *
   * @param {string} selector
   *        A valid CSS selector, which will be passed to `querySelectorAll`.
   *
   * @param {Element|string} [context=this.contentEl()]
   *        A DOM element within which to query. Can also be a selector string in
   *        which case the first matching element will get used as context. If
   *        missing `this.contentEl()` gets used. If  `this.contentEl()` returns
   *        nothing it falls back to `document`.
   *
   * @return {NodeList}
   *         a list of dom elements that were found
   *
   * @see [Information on CSS Selectors](https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Getting_Started/Selectors)
   */
  $$(selector, context) {
    return $$(selector, context || this.contentEl());
  }

  /**
   * Check if a component's element has a CSS class name.
   *
   * @param {string} classToCheck
   *        CSS class name to check.
   *
   * @return {boolean}
   *         - True if the `Component` has the class.
   *         - False if the `Component` does not have the class`
   */
  hasClass(classToCheck) {
    return hasClass(this.el_, classToCheck);
  }

  /**
   * Add a CSS class name to the `Component`s element.
   *
   * @param {...string} classesToAdd
   *        One or more CSS class name to add.
   */
  addClass(...classesToAdd) {
    addClass(this.el_, ...classesToAdd);
  }

  /**
   * Remove a CSS class name from the `Component`s element.
   *
   * @param {...string} classesToRemove
   *        One or more CSS class name to remove.
   */
  removeClass(...classesToRemove) {
    removeClass(this.el_, ...classesToRemove);
  }

  /**
   * Add or remove a CSS class name from the component's element.
   * - `classToToggle` gets added when {@link Component#hasClass} would return false.
   * - `classToToggle` gets removed when {@link Component#hasClass} would return true.
   *
   * @param  {string} classToToggle
   *         The class to add or remove based on (@link Component#hasClass}
   *
   * @param  {boolean|Dom~predicate} [predicate]
   *         An {@link Dom~predicate} function or a boolean
   */
  toggleClass(classToToggle, predicate) {
    toggleClass(this.el_, classToToggle, predicate);
  }

  /**
   * Show the `Component`s element if it is hidden by removing the
   * 'vjs-hidden' class name from it.
   */
  show() {
    this.removeClass('vjs-hidden');
  }

  /**
   * Hide the `Component`s element if it is currently showing by adding the
   * 'vjs-hidden` class name to it.
   */
  hide() {
    this.addClass('vjs-hidden');
  }

  /**
   * Lock a `Component`s element in its visible state by adding the 'vjs-lock-showing'
   * class name to it. Used during fadeIn/fadeOut.
   *
   * @private
   */
  lockShowing() {
    this.addClass('vjs-lock-showing');
  }

  /**
   * Unlock a `Component`s element from its visible state by removing the 'vjs-lock-showing'
   * class name from it. Used during fadeIn/fadeOut.
   *
   * @private
   */
  unlockShowing() {
    this.removeClass('vjs-lock-showing');
  }

  /**
   * Get the value of an attribute on the `Component`s element.
   *
   * @param {string} attribute
   *        Name of the attribute to get the value from.
   *
   * @return {string|null}
   *         - The value of the attribute that was asked for.
   *         - Can be an empty string on some browsers if the attribute does not exist
   *           or has no value
   *         - Most browsers will return null if the attribute does not exist or has
   *           no value.
   *
   * @see [DOM API]{@link https://developer.mozilla.org/en-US/docs/Web/API/Element/getAttribute}
   */
  getAttribute(attribute) {
    return getAttribute(this.el_, attribute);
  }

  /**
   * Set the value of an attribute on the `Component`'s element
   *
   * @param {string} attribute
   *        Name of the attribute to set.
   *
   * @param {string} value
   *        Value to set the attribute to.
   *
   * @see [DOM API]{@link https://developer.mozilla.org/en-US/docs/Web/API/Element/setAttribute}
   */
  setAttribute(attribute, value) {
    setAttribute(this.el_, attribute, value);
  }

  /**
   * Remove an attribute from the `Component`s element.
   *
   * @param {string} attribute
   *        Name of the attribute to remove.
   *
   * @see [DOM API]{@link https://developer.mozilla.org/en-US/docs/Web/API/Element/removeAttribute}
   */
  removeAttribute(attribute) {
    removeAttribute(this.el_, attribute);
  }

  /**
   * Get or set the width of the component based upon the CSS styles.
   * See {@link Component#dimension} for more detailed information.
   *
   * @param {number|string} [num]
   *        The width that you want to set postfixed with '%', 'px' or nothing.
   *
   * @param {boolean} [skipListeners]
   *        Skip the componentresize event trigger
   *
   * @return {number|string}
   *         The width when getting, zero if there is no width. Can be a string
   *           postpixed with '%' or 'px'.
   */
  width(num, skipListeners) {
    return this.dimension('width', num, skipListeners);
  }

  /**
   * Get or set the height of the component based upon the CSS styles.
   * See {@link Component#dimension} for more detailed information.
   *
   * @param {number|string} [num]
   *        The height that you want to set postfixed with '%', 'px' or nothing.
   *
   * @param {boolean} [skipListeners]
   *        Skip the componentresize event trigger
   *
   * @return {number|string}
   *         The width when getting, zero if there is no width. Can be a string
   *         postpixed with '%' or 'px'.
   */
  height(num, skipListeners) {
    return this.dimension('height', num, skipListeners);
  }

  /**
   * Set both the width and height of the `Component` element at the same time.
   *
   * @param  {number|string} width
   *         Width to set the `Component`s element to.
   *
   * @param  {number|string} height
   *         Height to set the `Component`s element to.
   */
  dimensions(width, height) {
    // Skip componentresize listeners on width for optimization
    this.width(width, true);
    this.height(height);
  }

  /**
   * Get or set width or height of the `Component` element. This is the shared code
   * for the {@link Component#width} and {@link Component#height}.
   *
   * Things to know:
   * - If the width or height in an number this will return the number postfixed with 'px'.
   * - If the width/height is a percent this will return the percent postfixed with '%'
   * - Hidden elements have a width of 0 with `window.getComputedStyle`. This function
   *   defaults to the `Component`s `style.width` and falls back to `window.getComputedStyle`.
   *   See [this]{@link http://www.foliotek.com/devblog/getting-the-width-of-a-hidden-element-with-jquery-using-width/}
   *   for more information
   * - If you want the computed style of the component, use {@link Component#currentWidth}
   *   and {@link {Component#currentHeight}
   *
   * @fires Component#componentresize
   *
   * @param {string} widthOrHeight
   8        'width' or 'height'
   *
   * @param  {number|string} [num]
   8         New dimension
   *
   * @param  {boolean} [skipListeners]
   *         Skip componentresize event trigger
   *
   * @return {number}
   *         The dimension when getting or 0 if unset
   */
  dimension(widthOrHeight, num, skipListeners) {
    if (num !== undefined) {
      // Set to zero if null or literally NaN (NaN !== NaN)
      if (num === null || num !== num) {
        num = 0;
      }

      // Check if using css width/height (% or px) and adjust
      if (('' + num).indexOf('%') !== -1 || ('' + num).indexOf('px') !== -1) {
        this.el_.style[widthOrHeight] = num;
      } else if (num === 'auto') {
        this.el_.style[widthOrHeight] = '';
      } else {
        this.el_.style[widthOrHeight] = num + 'px';
      }

      // skipListeners allows us to avoid triggering the resize event when setting both width and height
      if (!skipListeners) {
        /**
         * Triggered when a component is resized.
         *
         * @event Component#componentresize
         * @type {Event}
         */
        this.trigger('componentresize');
      }
      return;
    }

    // Not setting a value, so getting it
    // Make sure element exists
    if (!this.el_) {
      return 0;
    }

    // Get dimension value from style
    const val = this.el_.style[widthOrHeight];
    const pxIndex = val.indexOf('px');
    if (pxIndex !== -1) {
      // Return the pixel value with no 'px'
      return parseInt(val.slice(0, pxIndex), 10);
    }

    // No px so using % or no style was set, so falling back to offsetWidth/height
    // If component has display:none, offset will return 0
    // TODO: handle display:none and no dimension style using px
    return parseInt(this.el_['offset' + toTitleCase(widthOrHeight)], 10);
  }

  /**
   * Get the computed width or the height of the component's element.
   *
   * Uses `window.getComputedStyle`.
   *
   * @param {string} widthOrHeight
   *        A string containing 'width' or 'height'. Whichever one you want to get.
   *
   * @return {number}
   *         The dimension that gets asked for or 0 if nothing was set
   *         for that dimension.
   */
  currentDimension(widthOrHeight) {
    let computedWidthOrHeight = 0;
    if (widthOrHeight !== 'width' && widthOrHeight !== 'height') {
      throw new Error('currentDimension only accepts width or height value');
    }
    computedWidthOrHeight = computedStyle(this.el_, widthOrHeight);

    // remove 'px' from variable and parse as integer
    computedWidthOrHeight = parseFloat(computedWidthOrHeight);

    // if the computed value is still 0, it's possible that the browser is lying
    // and we want to check the offset values.
    // This code also runs wherever getComputedStyle doesn't exist.
    if (computedWidthOrHeight === 0 || isNaN(computedWidthOrHeight)) {
      const rule = `offset${toTitleCase(widthOrHeight)}`;
      computedWidthOrHeight = this.el_[rule];
    }
    return computedWidthOrHeight;
  }

  /**
   * An object that contains width and height values of the `Component`s
   * computed style. Uses `window.getComputedStyle`.
   *
   * @typedef {Object} Component~DimensionObject
   *
   * @property {number} width
   *           The width of the `Component`s computed style.
   *
   * @property {number} height
   *           The height of the `Component`s computed style.
   */

  /**
   * Get an object that contains computed width and height values of the
   * component's element.
   *
   * Uses `window.getComputedStyle`.
   *
   * @return {Component~DimensionObject}
   *         The computed dimensions of the component's element.
   */
  currentDimensions() {
    return {
      width: this.currentDimension('width'),
      height: this.currentDimension('height')
    };
  }

  /**
   * Get the computed width of the component's element.
   *
   * Uses `window.getComputedStyle`.
   *
   * @return {number}
   *         The computed width of the component's element.
   */
  currentWidth() {
    return this.currentDimension('width');
  }

  /**
   * Get the computed height of the component's element.
   *
   * Uses `window.getComputedStyle`.
   *
   * @return {number}
   *         The computed height of the component's element.
   */
  currentHeight() {
    return this.currentDimension('height');
  }

  /**
   * Set the focus to this component
   */
  focus() {
    this.el_.focus();
  }

  /**
   * Remove the focus from this component
   */
  blur() {
    this.el_.blur();
  }

  /**
   * When this Component receives a `keydown` event which it does not process,
   *  it passes the event to the Player for handling.
   *
   * @param {KeyboardEvent} event
   *        The `keydown` event that caused this function to be called.
   */
  handleKeyDown(event) {
    if (this.player_) {
      // We only stop propagation here because we want unhandled events to fall
      // back to the browser. Exclude Tab for focus trapping.
      if (!keycode.isEventKey(event, 'Tab')) {
        event.stopPropagation();
      }
      this.player_.handleKeyDown(event);
    }
  }

  /**
   * Many components used to have a `handleKeyPress` method, which was poorly
   * named because it listened to a `keydown` event. This method name now
   * delegates to `handleKeyDown`. This means anyone calling `handleKeyPress`
   * will not see their method calls stop working.
   *
   * @param {Event} event
   *        The event that caused this function to be called.
   */
  handleKeyPress(event) {
    this.handleKeyDown(event);
  }

  /**
   * Emit a 'tap' events when touch event support gets detected. This gets used to
   * support toggling the controls through a tap on the video. They get enabled
   * because every sub-component would have extra overhead otherwise.
   *
   * @private
   * @fires Component#tap
   * @listens Component#touchstart
   * @listens Component#touchmove
   * @listens Component#touchleave
   * @listens Component#touchcancel
   * @listens Component#touchend
    */
  emitTapEvents() {
    // Track the start time so we can determine how long the touch lasted
    let touchStart = 0;
    let firstTouch = null;

    // Maximum movement allowed during a touch event to still be considered a tap
    // Other popular libs use anywhere from 2 (hammer.js) to 15,
    // so 10 seems like a nice, round number.
    const tapMovementThreshold = 10;

    // The maximum length a touch can be while still being considered a tap
    const touchTimeThreshold = 200;
    let couldBeTap;
    this.on('touchstart', function (event) {
      // If more than one finger, don't consider treating this as a click
      if (event.touches.length === 1) {
        // Copy pageX/pageY from the object
        firstTouch = {
          pageX: event.touches[0].pageX,
          pageY: event.touches[0].pageY
        };
        // Record start time so we can detect a tap vs. "touch and hold"
        touchStart = window.performance.now();
        // Reset couldBeTap tracking
        couldBeTap = true;
      }
    });
    this.on('touchmove', function (event) {
      // If more than one finger, don't consider treating this as a click
      if (event.touches.length > 1) {
        couldBeTap = false;
      } else if (firstTouch) {
        // Some devices will throw touchmoves for all but the slightest of taps.
        // So, if we moved only a small distance, this could still be a tap
        const xdiff = event.touches[0].pageX - firstTouch.pageX;
        const ydiff = event.touches[0].pageY - firstTouch.pageY;
        const touchDistance = Math.sqrt(xdiff * xdiff + ydiff * ydiff);
        if (touchDistance > tapMovementThreshold) {
          couldBeTap = false;
        }
      }
    });
    const noTap = function () {
      couldBeTap = false;
    };

    // TODO: Listen to the original target. http://youtu.be/DujfpXOKUp8?t=13m8s
    this.on('touchleave', noTap);
    this.on('touchcancel', noTap);

    // When the touch ends, measure how long it took and trigger the appropriate
    // event
    this.on('touchend', function (event) {
      firstTouch = null;
      // Proceed only if the touchmove/leave/cancel event didn't happen
      if (couldBeTap === true) {
        // Measure how long the touch lasted
        const touchTime = window.performance.now() - touchStart;

        // Make sure the touch was less than the threshold to be considered a tap
        if (touchTime < touchTimeThreshold) {
          // Don't let browser turn this into a click
          event.preventDefault();
          /**
           * Triggered when a `Component` is tapped.
           *
           * @event Component#tap
           * @type {MouseEvent}
           */
          this.trigger('tap');
          // It may be good to copy the touchend event object and change the
          // type to tap, if the other event properties aren't exact after
          // Events.fixEvent runs (e.g. event.target)
        }
      }
    });
  }

  /**
   * This function reports user activity whenever touch events happen. This can get
   * turned off by any sub-components that wants touch events to act another way.
   *
   * Report user touch activity when touch events occur. User activity gets used to
   * determine when controls should show/hide. It is simple when it comes to mouse
   * events, because any mouse event should show the controls. So we capture mouse
   * events that bubble up to the player and report activity when that happens.
   * With touch events it isn't as easy as `touchstart` and `touchend` toggle player
   * controls. So touch events can't help us at the player level either.
   *
   * User activity gets checked asynchronously. So what could happen is a tap event
   * on the video turns the controls off. Then the `touchend` event bubbles up to
   * the player. Which, if it reported user activity, would turn the controls right
   * back on. We also don't want to completely block touch events from bubbling up.
   * Furthermore a `touchmove` event and anything other than a tap, should not turn
   * controls back on.
   *
   * @listens Component#touchstart
   * @listens Component#touchmove
   * @listens Component#touchend
   * @listens Component#touchcancel
   */
  enableTouchActivity() {
    // Don't continue if the root player doesn't support reporting user activity
    if (!this.player() || !this.player().reportUserActivity) {
      return;
    }

    // listener for reporting that the user is active
    const report = bind_(this.player(), this.player().reportUserActivity);
    let touchHolding;
    this.on('touchstart', function () {
      report();
      // For as long as the they are touching the device or have their mouse down,
      // we consider them active even if they're not moving their finger or mouse.
      // So we want to continue to update that they are active
      this.clearInterval(touchHolding);
      // report at the same interval as activityCheck
      touchHolding = this.setInterval(report, 250);
    });
    const touchEnd = function (event) {
      report();
      // stop the interval that maintains activity if the touch is holding
      this.clearInterval(touchHolding);
    };
    this.on('touchmove', report);
    this.on('touchend', touchEnd);
    this.on('touchcancel', touchEnd);
  }

  /**
   * A callback that has no parameters and is bound into `Component`s context.
   *
   * @callback Component~GenericCallback
   * @this Component
   */

  /**
   * Creates a function that runs after an `x` millisecond timeout. This function is a
   * wrapper around `window.setTimeout`. There are a few reasons to use this one
   * instead though:
   * 1. It gets cleared via  {@link Component#clearTimeout} when
   *    {@link Component#dispose} gets called.
   * 2. The function callback will gets turned into a {@link Component~GenericCallback}
   *
   * > Note: You can't use `window.clearTimeout` on the id returned by this function. This
   *         will cause its dispose listener not to get cleaned up! Please use
   *         {@link Component#clearTimeout} or {@link Component#dispose} instead.
   *
   * @param {Component~GenericCallback} fn
   *        The function that will be run after `timeout`.
   *
   * @param {number} timeout
   *        Timeout in milliseconds to delay before executing the specified function.
   *
   * @return {number}
   *         Returns a timeout ID that gets used to identify the timeout. It can also
   *         get used in {@link Component#clearTimeout} to clear the timeout that
   *         was set.
   *
   * @listens Component#dispose
   * @see [Similar to]{@link https://developer.mozilla.org/en-US/docs/Web/API/WindowTimers/setTimeout}
   */
  setTimeout(fn, timeout) {
    // declare as variables so they are properly available in timeout function
    // eslint-disable-next-line
    var timeoutId;
    fn = bind_(this, fn);
    this.clearTimersOnDispose_();
    timeoutId = window.setTimeout(() => {
      if (this.setTimeoutIds_.has(timeoutId)) {
        this.setTimeoutIds_.delete(timeoutId);
      }
      fn();
    }, timeout);
    this.setTimeoutIds_.add(timeoutId);
    return timeoutId;
  }

  /**
   * Clears a timeout that gets created via `window.setTimeout` or
   * {@link Component#setTimeout}. If you set a timeout via {@link Component#setTimeout}
   * use this function instead of `window.clearTimout`. If you don't your dispose
   * listener will not get cleaned up until {@link Component#dispose}!
   *
   * @param {number} timeoutId
   *        The id of the timeout to clear. The return value of
   *        {@link Component#setTimeout} or `window.setTimeout`.
   *
   * @return {number}
   *         Returns the timeout id that was cleared.
   *
   * @see [Similar to]{@link https://developer.mozilla.org/en-US/docs/Web/API/WindowTimers/clearTimeout}
   */
  clearTimeout(timeoutId) {
    if (this.setTimeoutIds_.has(timeoutId)) {
      this.setTimeoutIds_.delete(timeoutId);
      window.clearTimeout(timeoutId);
    }
    return timeoutId;
  }

  /**
   * Creates a function that gets run every `x` milliseconds. This function is a wrapper
   * around `window.setInterval`. There are a few reasons to use this one instead though.
   * 1. It gets cleared via  {@link Component#clearInterval} when
   *    {@link Component#dispose} gets called.
   * 2. The function callback will be a {@link Component~GenericCallback}
   *
   * @param {Component~GenericCallback} fn
   *        The function to run every `x` seconds.
   *
   * @param {number} interval
   *        Execute the specified function every `x` milliseconds.
   *
   * @return {number}
   *         Returns an id that can be used to identify the interval. It can also be be used in
   *         {@link Component#clearInterval} to clear the interval.
   *
   * @listens Component#dispose
   * @see [Similar to]{@link https://developer.mozilla.org/en-US/docs/Web/API/WindowTimers/setInterval}
   */
  setInterval(fn, interval) {
    fn = bind_(this, fn);
    this.clearTimersOnDispose_();
    const intervalId = window.setInterval(fn, interval);
    this.setIntervalIds_.add(intervalId);
    return intervalId;
  }

  /**
   * Clears an interval that gets created via `window.setInterval` or
   * {@link Component#setInterval}. If you set an interval via {@link Component#setInterval}
   * use this function instead of `window.clearInterval`. If you don't your dispose
   * listener will not get cleaned up until {@link Component#dispose}!
   *
   * @param {number} intervalId
   *        The id of the interval to clear. The return value of
   *        {@link Component#setInterval} or `window.setInterval`.
   *
   * @return {number}
   *         Returns the interval id that was cleared.
   *
   * @see [Similar to]{@link https://developer.mozilla.org/en-US/docs/Web/API/WindowTimers/clearInterval}
   */
  clearInterval(intervalId) {
    if (this.setIntervalIds_.has(intervalId)) {
      this.setIntervalIds_.delete(intervalId);
      window.clearInterval(intervalId);
    }
    return intervalId;
  }

  /**
   * Queues up a callback to be passed to requestAnimationFrame (rAF), but
   * with a few extra bonuses:
   *
   * - Supports browsers that do not support rAF by falling back to
   *   {@link Component#setTimeout}.
   *
   * - The callback is turned into a {@link Component~GenericCallback} (i.e.
   *   bound to the component).
   *
   * - Automatic cancellation of the rAF callback is handled if the component
   *   is disposed before it is called.
   *
   * @param  {Component~GenericCallback} fn
   *         A function that will be bound to this component and executed just
   *         before the browser's next repaint.
   *
   * @return {number}
   *         Returns an rAF ID that gets used to identify the timeout. It can
   *         also be used in {@link Component#cancelAnimationFrame} to cancel
   *         the animation frame callback.
   *
   * @listens Component#dispose
   * @see [Similar to]{@link https://developer.mozilla.org/en-US/docs/Web/API/window/requestAnimationFrame}
   */
  requestAnimationFrame(fn) {
    this.clearTimersOnDispose_();

    // declare as variables so they are properly available in rAF function
    // eslint-disable-next-line
    var id;
    fn = bind_(this, fn);
    id = window.requestAnimationFrame(() => {
      if (this.rafIds_.has(id)) {
        this.rafIds_.delete(id);
      }
      fn();
    });
    this.rafIds_.add(id);
    return id;
  }

  /**
   * Request an animation frame, but only one named animation
   * frame will be queued. Another will never be added until
   * the previous one finishes.
   *
   * @param {string} name
   *        The name to give this requestAnimationFrame
   *
   * @param  {Component~GenericCallback} fn
   *         A function that will be bound to this component and executed just
   *         before the browser's next repaint.
   */
  requestNamedAnimationFrame(name, fn) {
    if (this.namedRafs_.has(name)) {
      return;
    }
    this.clearTimersOnDispose_();
    fn = bind_(this, fn);
    const id = this.requestAnimationFrame(() => {
      fn();
      if (this.namedRafs_.has(name)) {
        this.namedRafs_.delete(name);
      }
    });
    this.namedRafs_.set(name, id);
    return name;
  }

  /**
   * Cancels a current named animation frame if it exists.
   *
   * @param {string} name
   *        The name of the requestAnimationFrame to cancel.
   */
  cancelNamedAnimationFrame(name) {
    if (!this.namedRafs_.has(name)) {
      return;
    }
    this.cancelAnimationFrame(this.namedRafs_.get(name));
    this.namedRafs_.delete(name);
  }

  /**
   * Cancels a queued callback passed to {@link Component#requestAnimationFrame}
   * (rAF).
   *
   * If you queue an rAF callback via {@link Component#requestAnimationFrame},
   * use this function instead of `window.cancelAnimationFrame`. If you don't,
   * your dispose listener will not get cleaned up until {@link Component#dispose}!
   *
   * @param {number} id
   *        The rAF ID to clear. The return value of {@link Component#requestAnimationFrame}.
   *
   * @return {number}
   *         Returns the rAF ID that was cleared.
   *
   * @see [Similar to]{@link https://developer.mozilla.org/en-US/docs/Web/API/window/cancelAnimationFrame}
   */
  cancelAnimationFrame(id) {
    if (this.rafIds_.has(id)) {
      this.rafIds_.delete(id);
      window.cancelAnimationFrame(id);
    }
    return id;
  }

  /**
   * A function to setup `requestAnimationFrame`, `setTimeout`,
   * and `setInterval`, clearing on dispose.
   *
   * > Previously each timer added and removed dispose listeners on it's own.
   * For better performance it was decided to batch them all, and use `Set`s
   * to track outstanding timer ids.
   *
   * @private
   */
  clearTimersOnDispose_() {
    if (this.clearingTimersOnDispose_) {
      return;
    }
    this.clearingTimersOnDispose_ = true;
    this.one('dispose', () => {
      [['namedRafs_', 'cancelNamedAnimationFrame'], ['rafIds_', 'cancelAnimationFrame'], ['setTimeoutIds_', 'clearTimeout'], ['setIntervalIds_', 'clearInterval']].forEach(([idName, cancelName]) => {
        // for a `Set` key will actually be the value again
        // so forEach((val, val) =>` but for maps we want to use
        // the key.
        this[idName].forEach((val, key) => this[cancelName](key));
      });
      this.clearingTimersOnDispose_ = false;
    });
  }

  /**
   * Register a `Component` with `videojs` given the name and the component.
   *
   * > NOTE: {@link Tech}s should not be registered as a `Component`. {@link Tech}s
   *         should be registered using {@link Tech.registerTech} or
   *         {@link videojs:videojs.registerTech}.
   *
   * > NOTE: This function can also be seen on videojs as
   *         {@link videojs:videojs.registerComponent}.
   *
   * @param {string} name
   *        The name of the `Component` to register.
   *
   * @param {Component} ComponentToRegister
   *        The `Component` class to register.
   *
   * @return {Component}
   *         The `Component` that was registered.
   */
  static registerComponent(name, ComponentToRegister) {
    if (typeof name !== 'string' || !name) {
      throw new Error(`Illegal component name, "${name}"; must be a non-empty string.`);
    }
    const Tech = Component.getComponent('Tech');

    // We need to make sure this check is only done if Tech has been registered.
    const isTech = Tech && Tech.isTech(ComponentToRegister);
    const isComp = Component === ComponentToRegister || Component.prototype.isPrototypeOf(ComponentToRegister.prototype);
    if (isTech || !isComp) {
      let reason;
      if (isTech) {
        reason = 'techs must be registered using Tech.registerTech()';
      } else {
        reason = 'must be a Component subclass';
      }
      throw new Error(`Illegal component, "${name}"; ${reason}.`);
    }
    name = toTitleCase(name);
    if (!Component.components_) {
      Component.components_ = {};
    }
    const Player = Component.getComponent('Player');
    if (name === 'Player' && Player && Player.players) {
      const players = Player.players;
      const playerNames = Object.keys(players);

      // If we have players that were disposed, then their name will still be
      // in Players.players. So, we must loop through and verify that the value
      // for each item is not null. This allows registration of the Player component
      // after all players have been disposed or before any were created.
      if (players && playerNames.length > 0 && playerNames.map(pname => players[pname]).every(Boolean)) {
        throw new Error('Can not register Player component after player has been created.');
      }
    }
    Component.components_[name] = ComponentToRegister;
    Component.components_[toLowerCase(name)] = ComponentToRegister;
    return ComponentToRegister;
  }

  /**
   * Get a `Component` based on the name it was registered with.
   *
   * @param {string} name
   *        The Name of the component to get.
   *
   * @return {Component}
   *         The `Component` that got registered under the given name.
   */
  static getComponent(name) {
    if (!name || !Component.components_) {
      return;
    }
    return Component.components_[name];
  }
}
Component.registerComponent('Component', Component);

/**
 * @file time.js
 * @module time
 */

/**
 * Returns the time for the specified index at the start or end
 * of a TimeRange object.
 *
 * @typedef    {Function} TimeRangeIndex
 *
 * @param      {number} [index=0]
 *             The range number to return the time for.
 *
 * @return     {number}
 *             The time offset at the specified index.
 *
 * @deprecated The index argument must be provided.
 *             In the future, leaving it out will throw an error.
 */

/**
 * An object that contains ranges of time, which mimics {@link TimeRanges}.
 *
 * @typedef  {Object} TimeRange
 *
 * @property {number} length
 *           The number of time ranges represented by this object.
 *
 * @property {module:time~TimeRangeIndex} start
 *           Returns the time offset at which a specified time range begins.
 *
 * @property {module:time~TimeRangeIndex} end
 *           Returns the time offset at which a specified time range ends.
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/API/TimeRanges
 */

/**
 * Check if any of the time ranges are over the maximum index.
 *
 * @private
 * @param   {string} fnName
 *          The function name to use for logging
 *
 * @param   {number} index
 *          The index to check
 *
 * @param   {number} maxIndex
 *          The maximum possible index
 *
 * @throws  {Error} if the timeRanges provided are over the maxIndex
 */
function rangeCheck(fnName, index, maxIndex) {
  if (typeof index !== 'number' || index < 0 || index > maxIndex) {
    throw new Error(`Failed to execute '${fnName}' on 'TimeRanges': The index provided (${index}) is non-numeric or out of bounds (0-${maxIndex}).`);
  }
}

/**
 * Get the time for the specified index at the start or end
 * of a TimeRange object.
 *
 * @private
 * @param      {string} fnName
 *             The function name to use for logging
 *
 * @param      {string} valueIndex
 *             The property that should be used to get the time. should be
 *             'start' or 'end'
 *
 * @param      {Array} ranges
 *             An array of time ranges
 *
 * @param      {Array} [rangeIndex=0]
 *             The index to start the search at
 *
 * @return     {number}
 *             The time that offset at the specified index.
 *
 * @deprecated rangeIndex must be set to a value, in the future this will throw an error.
 * @throws     {Error} if rangeIndex is more than the length of ranges
 */
function getRange(fnName, valueIndex, ranges, rangeIndex) {
  rangeCheck(fnName, rangeIndex, ranges.length - 1);
  return ranges[rangeIndex][valueIndex];
}

/**
 * Create a time range object given ranges of time.
 *
 * @private
 * @param   {Array} [ranges]
 *          An array of time ranges.
 *
 * @return  {TimeRange}
 */
function createTimeRangesObj(ranges) {
  let timeRangesObj;
  if (ranges === undefined || ranges.length === 0) {
    timeRangesObj = {
      length: 0,
      start() {
        throw new Error('This TimeRanges object is empty');
      },
      end() {
        throw new Error('This TimeRanges object is empty');
      }
    };
  } else {
    timeRangesObj = {
      length: ranges.length,
      start: getRange.bind(null, 'start', 0, ranges),
      end: getRange.bind(null, 'end', 1, ranges)
    };
  }
  if (window.Symbol && window.Symbol.iterator) {
    timeRangesObj[window.Symbol.iterator] = () => (ranges || []).values();
  }
  return timeRangesObj;
}

/**
 * Create a `TimeRange` object which mimics an
 * {@link https://developer.mozilla.org/en-US/docs/Web/API/TimeRanges|HTML5 TimeRanges instance}.
 *
 * @param {number|Array[]} start
 *        The start of a single range (a number) or an array of ranges (an
 *        array of arrays of two numbers each).
 *
 * @param {number} end
 *        The end of a single range. Cannot be used with the array form of
 *        the `start` argument.
 *
 * @return {TimeRange}
 */
function createTimeRanges(start, end) {
  if (Array.isArray(start)) {
    return createTimeRangesObj(start);
  } else if (start === undefined || end === undefined) {
    return createTimeRangesObj();
  }
  return createTimeRangesObj([[start, end]]);
}

/**
 * Format seconds as a time string, H:MM:SS or M:SS. Supplying a guide (in
 * seconds) will force a number of leading zeros to cover the length of the
 * guide.
 *
 * @private
 * @param  {number} seconds
 *         Number of seconds to be turned into a string
 *
 * @param  {number} guide
 *         Number (in seconds) to model the string after
 *
 * @return {string}
 *         Time formatted as H:MM:SS or M:SS
 */
const defaultImplementation = function (seconds, guide) {
  seconds = seconds < 0 ? 0 : seconds;
  let s = Math.floor(seconds % 60);
  let m = Math.floor(seconds / 60 % 60);
  let h = Math.floor(seconds / 3600);
  const gm = Math.floor(guide / 60 % 60);
  const gh = Math.floor(guide / 3600);

  // handle invalid times
  if (isNaN(seconds) || seconds === Infinity) {
    // '-' is false for all relational operators (e.g. <, >=) so this setting
    // will add the minimum number of fields specified by the guide
    h = m = s = '-';
  }

  // Check if we need to show hours
  h = h > 0 || gh > 0 ? h + ':' : '';

  // If hours are showing, we may need to add a leading zero.
  // Always show at least one digit of minutes.
  m = ((h || gm >= 10) && m < 10 ? '0' + m : m) + ':';

  // Check if leading zero is need for seconds
  s = s < 10 ? '0' + s : s;
  return h + m + s;
};

// Internal pointer to the current implementation.
let implementation = defaultImplementation;

/**
 * Replaces the default formatTime implementation with a custom implementation.
 *
 * @param {Function} customImplementation
 *        A function which will be used in place of the default formatTime
 *        implementation. Will receive the current time in seconds and the
 *        guide (in seconds) as arguments.
 */
function setFormatTime(customImplementation) {
  implementation = customImplementation;
}

/**
 * Resets formatTime to the default implementation.
 */
function resetFormatTime() {
  implementation = defaultImplementation;
}

/**
 * Delegates to either the default time formatting function or a custom
 * function supplied via `setFormatTime`.
 *
 * Formats seconds as a time string (H:MM:SS or M:SS). Supplying a
 * guide (in seconds) will force a number of leading zeros to cover the
 * length of the guide.
 *
 * @example  formatTime(125, 600) === "02:05"
 * @param    {number} seconds
 *           Number of seconds to be turned into a string
 *
 * @param    {number} guide
 *           Number (in seconds) to model the string after
 *
 * @return   {string}
 *           Time formatted as H:MM:SS or M:SS
 */
function formatTime(seconds, guide = seconds) {
  return implementation(seconds, guide);
}

var Time = /*#__PURE__*/Object.freeze({
  __proto__: null,
  createTimeRanges: createTimeRanges,
  createTimeRange: createTimeRanges,
  setFormatTime: setFormatTime,
  resetFormatTime: resetFormatTime,
  formatTime: formatTime
});

/**
 * @file buffer.js
 * @module buffer
 */

/**
 * Compute the percentage of the media that has been buffered.
 *
 * @param { import('./time').TimeRange } buffered
 *        The current `TimeRanges` object representing buffered time ranges
 *
 * @param {number} duration
 *        Total duration of the media
 *
 * @return {number}
 *         Percent buffered of the total duration in decimal form.
 */
function bufferedPercent(buffered, duration) {
  let bufferedDuration = 0;
  let start;
  let end;
  if (!duration) {
    return 0;
  }
  if (!buffered || !buffered.length) {
    buffered = createTimeRanges(0, 0);
  }
  for (let i = 0; i < buffered.length; i++) {
    start = buffered.start(i);
    end = buffered.end(i);

    // buffered end can be bigger than duration by a very small fraction
    if (end > duration) {
      end = duration;
    }
    bufferedDuration += end - start;
  }
  return bufferedDuration / duration;
}

/**
 * @file media-error.js
 */

/**
 * A Custom `MediaError` class which mimics the standard HTML5 `MediaError` class.
 *
 * @param {number|string|Object|MediaError} value
 *        This can be of multiple types:
 *        - number: should be a standard error code
 *        - string: an error message (the code will be 0)
 *        - Object: arbitrary properties
 *        - `MediaError` (native): used to populate a video.js `MediaError` object
 *        - `MediaError` (video.js): will return itself if it's already a
 *          video.js `MediaError` object.
 *
 * @see [MediaError Spec]{@link https://dev.w3.org/html5/spec-author-view/video.html#mediaerror}
 * @see [Encrypted MediaError Spec]{@link https://www.w3.org/TR/2013/WD-encrypted-media-20130510/#error-codes}
 *
 * @class MediaError
 */
function MediaError(value) {
  // Allow redundant calls to this constructor to avoid having `instanceof`
  // checks peppered around the code.
  if (value instanceof MediaError) {
    return value;
  }
  if (typeof value === 'number') {
    this.code = value;
  } else if (typeof value === 'string') {
    // default code is zero, so this is a custom error
    this.message = value;
  } else if (isObject(value)) {
    // We assign the `code` property manually because native `MediaError` objects
    // do not expose it as an own/enumerable property of the object.
    if (typeof value.code === 'number') {
      this.code = value.code;
    }
    Object.assign(this, value);
  }
  if (!this.message) {
    this.message = MediaError.defaultMessages[this.code] || '';
  }
}

/**
 * The error code that refers two one of the defined `MediaError` types
 *
 * @type {Number}
 */
MediaError.prototype.code = 0;

/**
 * An optional message that to show with the error. Message is not part of the HTML5
 * video spec but allows for more informative custom errors.
 *
 * @type {String}
 */
MediaError.prototype.message = '';

/**
 * An optional status code that can be set by plugins to allow even more detail about
 * the error. For example a plugin might provide a specific HTTP status code and an
 * error message for that code. Then when the plugin gets that error this class will
 * know how to display an error message for it. This allows a custom message to show
 * up on the `Player` error overlay.
 *
 * @type {Array}
 */
MediaError.prototype.status = null;

/**
 * Errors indexed by the W3C standard. The order **CANNOT CHANGE**! See the
 * specification listed under {@link MediaError} for more information.
 *
 * @enum {array}
 * @readonly
 * @property {string} 0 - MEDIA_ERR_CUSTOM
 * @property {string} 1 - MEDIA_ERR_ABORTED
 * @property {string} 2 - MEDIA_ERR_NETWORK
 * @property {string} 3 - MEDIA_ERR_DECODE
 * @property {string} 4 - MEDIA_ERR_SRC_NOT_SUPPORTED
 * @property {string} 5 - MEDIA_ERR_ENCRYPTED
 */
MediaError.errorTypes = ['MEDIA_ERR_CUSTOM', 'MEDIA_ERR_ABORTED', 'MEDIA_ERR_NETWORK', 'MEDIA_ERR_DECODE', 'MEDIA_ERR_SRC_NOT_SUPPORTED', 'MEDIA_ERR_ENCRYPTED'];

/**
 * The default `MediaError` messages based on the {@link MediaError.errorTypes}.
 *
 * @type {Array}
 * @constant
 */
MediaError.defaultMessages = {
  1: 'You aborted the media playback',
  2: 'A network error caused the media download to fail part-way.',
  3: 'The media playback was aborted due to a corruption problem or because the media used features your browser did not support.',
  4: 'The media could not be loaded, either because the server or network failed or because the format is not supported.',
  5: 'The media is encrypted and we do not have the keys to decrypt it.'
};

// Add types as properties on MediaError
// e.g. MediaError.MEDIA_ERR_SRC_NOT_SUPPORTED = 4;
for (let errNum = 0; errNum < MediaError.errorTypes.length; errNum++) {
  MediaError[MediaError.errorTypes[errNum]] = errNum;
  // values should be accessible on both the class and instance
  MediaError.prototype[MediaError.errorTypes[errNum]] = errNum;
}

/**
 * Returns whether an object is `Promise`-like (i.e. has a `then` method).
 *
 * @param  {Object}  value
 *         An object that may or may not be `Promise`-like.
 *
 * @return {boolean}
 *         Whether or not the object is `Promise`-like.
 */
function isPromise(value) {
  return value !== undefined && value !== null && typeof value.then === 'function';
}

/**
 * Silence a Promise-like object.
 *
 * This is useful for avoiding non-harmful, but potentially confusing "uncaught
 * play promise" rejection error messages.
 *
 * @param  {Object} value
 *         An object that may or may not be `Promise`-like.
 */
function silencePromise(value) {
  if (isPromise(value)) {
    value.then(null, e => {});
  }
}

/**
 * @file text-track-list-converter.js Utilities for capturing text track state and
 * re-creating tracks based on a capture.
 *
 * @module text-track-list-converter
 */

/**
 * Examine a single {@link TextTrack} and return a JSON-compatible javascript object that
 * represents the {@link TextTrack}'s state.
 *
 * @param {TextTrack} track
 *        The text track to query.
 *
 * @return {Object}
 *         A serializable javascript representation of the TextTrack.
 * @private
 */
const trackToJson_ = function (track) {
  const ret = ['kind', 'label', 'language', 'id', 'inBandMetadataTrackDispatchType', 'mode', 'src'].reduce((acc, prop, i) => {
    if (track[prop]) {
      acc[prop] = track[prop];
    }
    return acc;
  }, {
    cues: track.cues && Array.prototype.map.call(track.cues, function (cue) {
      return {
        startTime: cue.startTime,
        endTime: cue.endTime,
        text: cue.text,
        id: cue.id
      };
    })
  });
  return ret;
};

/**
 * Examine a {@link Tech} and return a JSON-compatible javascript array that represents the
 * state of all {@link TextTrack}s currently configured. The return array is compatible with
 * {@link text-track-list-converter:jsonToTextTracks}.
 *
 * @param { import('../tech/tech').default } tech
 *        The tech object to query
 *
 * @return {Array}
 *         A serializable javascript representation of the {@link Tech}s
 *         {@link TextTrackList}.
 */
const textTracksToJson = function (tech) {
  const trackEls = tech.$$('track');
  const trackObjs = Array.prototype.map.call(trackEls, t => t.track);
  const tracks = Array.prototype.map.call(trackEls, function (trackEl) {
    const json = trackToJson_(trackEl.track);
    if (trackEl.src) {
      json.src = trackEl.src;
    }
    return json;
  });
  return tracks.concat(Array.prototype.filter.call(tech.textTracks(), function (track) {
    return trackObjs.indexOf(track) === -1;
  }).map(trackToJson_));
};

/**
 * Create a set of remote {@link TextTrack}s on a {@link Tech} based on an array of javascript
 * object {@link TextTrack} representations.
 *
 * @param {Array} json
 *        An array of `TextTrack` representation objects, like those that would be
 *        produced by `textTracksToJson`.
 *
 * @param {Tech} tech
 *        The `Tech` to create the `TextTrack`s on.
 */
const jsonToTextTracks = function (json, tech) {
  json.forEach(function (track) {
    const addedTrack = tech.addRemoteTextTrack(track).track;
    if (!track.src && track.cues) {
      track.cues.forEach(cue => addedTrack.addCue(cue));
    }
  });
  return tech.textTracks();
};
var textTrackConverter = {
  textTracksToJson,
  jsonToTextTracks,
  trackToJson_
};

/**
 * @file modal-dialog.js
 */
const MODAL_CLASS_NAME = 'vjs-modal-dialog';

/**
 * The `ModalDialog` displays over the video and its controls, which blocks
 * interaction with the player until it is closed.
 *
 * Modal dialogs include a "Close" button and will close when that button
 * is activated - or when ESC is pressed anywhere.
 *
 * @extends Component
 */
class ModalDialog extends Component {
  /**
   * Create an instance of this class.
   *
   * @param { import('./player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   *
   * @param { import('./utils/dom').ContentDescriptor} [options.content=undefined]
   *        Provide customized content for this modal.
   *
   * @param {string} [options.description]
   *        A text description for the modal, primarily for accessibility.
   *
   * @param {boolean} [options.fillAlways=false]
   *        Normally, modals are automatically filled only the first time
   *        they open. This tells the modal to refresh its content
   *        every time it opens.
   *
   * @param {string} [options.label]
   *        A text label for the modal, primarily for accessibility.
   *
   * @param {boolean} [options.pauseOnOpen=true]
   *        If `true`, playback will will be paused if playing when
   *        the modal opens, and resumed when it closes.
   *
   * @param {boolean} [options.temporary=true]
   *        If `true`, the modal can only be opened once; it will be
   *        disposed as soon as it's closed.
   *
   * @param {boolean} [options.uncloseable=false]
   *        If `true`, the user will not be able to close the modal
   *        through the UI in the normal ways. Programmatic closing is
   *        still possible.
   */
  constructor(player, options) {
    super(player, options);
    this.handleKeyDown_ = e => this.handleKeyDown(e);
    this.close_ = e => this.close(e);
    this.opened_ = this.hasBeenOpened_ = this.hasBeenFilled_ = false;
    this.closeable(!this.options_.uncloseable);
    this.content(this.options_.content);

    // Make sure the contentEl is defined AFTER any children are initialized
    // because we only want the contents of the modal in the contentEl
    // (not the UI elements like the close button).
    this.contentEl_ = createEl('div', {
      className: `${MODAL_CLASS_NAME}-content`
    }, {
      role: 'document'
    });
    this.descEl_ = createEl('p', {
      className: `${MODAL_CLASS_NAME}-description vjs-control-text`,
      id: this.el().getAttribute('aria-describedby')
    });
    textContent(this.descEl_, this.description());
    this.el_.appendChild(this.descEl_);
    this.el_.appendChild(this.contentEl_);
  }

  /**
   * Create the `ModalDialog`'s DOM element
   *
   * @return {Element}
   *         The DOM element that gets created.
   */
  createEl() {
    return super.createEl('div', {
      className: this.buildCSSClass(),
      tabIndex: -1
    }, {
      'aria-describedby': `${this.id()}_description`,
      'aria-hidden': 'true',
      'aria-label': this.label(),
      'role': 'dialog'
    });
  }
  dispose() {
    this.contentEl_ = null;
    this.descEl_ = null;
    this.previouslyActiveEl_ = null;
    super.dispose();
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `${MODAL_CLASS_NAME} vjs-hidden ${super.buildCSSClass()}`;
  }

  /**
   * Returns the label string for this modal. Primarily used for accessibility.
   *
   * @return {string}
   *         the localized or raw label of this modal.
   */
  label() {
    return this.localize(this.options_.label || 'Modal Window');
  }

  /**
   * Returns the description string for this modal. Primarily used for
   * accessibility.
   *
   * @return {string}
   *         The localized or raw description of this modal.
   */
  description() {
    let desc = this.options_.description || this.localize('This is a modal window.');

    // Append a universal closeability message if the modal is closeable.
    if (this.closeable()) {
      desc += ' ' + this.localize('This modal can be closed by pressing the Escape key or activating the close button.');
    }
    return desc;
  }

  /**
   * Opens the modal.
   *
   * @fires ModalDialog#beforemodalopen
   * @fires ModalDialog#modalopen
   */
  open() {
    if (!this.opened_) {
      const player = this.player();

      /**
        * Fired just before a `ModalDialog` is opened.
        *
        * @event ModalDialog#beforemodalopen
        * @type {Event}
        */
      this.trigger('beforemodalopen');
      this.opened_ = true;

      // Fill content if the modal has never opened before and
      // never been filled.
      if (this.options_.fillAlways || !this.hasBeenOpened_ && !this.hasBeenFilled_) {
        this.fill();
      }

      // If the player was playing, pause it and take note of its previously
      // playing state.
      this.wasPlaying_ = !player.paused();
      if (this.options_.pauseOnOpen && this.wasPlaying_) {
        player.pause();
      }
      this.on('keydown', this.handleKeyDown_);

      // Hide controls and note if they were enabled.
      this.hadControls_ = player.controls();
      player.controls(false);
      this.show();
      this.conditionalFocus_();
      this.el().setAttribute('aria-hidden', 'false');

      /**
        * Fired just after a `ModalDialog` is opened.
        *
        * @event ModalDialog#modalopen
        * @type {Event}
        */
      this.trigger('modalopen');
      this.hasBeenOpened_ = true;
    }
  }

  /**
   * If the `ModalDialog` is currently open or closed.
   *
   * @param  {boolean} [value]
   *         If given, it will open (`true`) or close (`false`) the modal.
   *
   * @return {boolean}
   *         the current open state of the modaldialog
   */
  opened(value) {
    if (typeof value === 'boolean') {
      this[value ? 'open' : 'close']();
    }
    return this.opened_;
  }

  /**
   * Closes the modal, does nothing if the `ModalDialog` is
   * not open.
   *
   * @fires ModalDialog#beforemodalclose
   * @fires ModalDialog#modalclose
   */
  close() {
    if (!this.opened_) {
      return;
    }
    const player = this.player();

    /**
      * Fired just before a `ModalDialog` is closed.
      *
      * @event ModalDialog#beforemodalclose
      * @type {Event}
      */
    this.trigger('beforemodalclose');
    this.opened_ = false;
    if (this.wasPlaying_ && this.options_.pauseOnOpen) {
      player.play();
    }
    this.off('keydown', this.handleKeyDown_);
    if (this.hadControls_) {
      player.controls(true);
    }
    this.hide();
    this.el().setAttribute('aria-hidden', 'true');

    /**
      * Fired just after a `ModalDialog` is closed.
      *
      * @event ModalDialog#modalclose
      * @type {Event}
      */
    this.trigger('modalclose');
    this.conditionalBlur_();
    if (this.options_.temporary) {
      this.dispose();
    }
  }

  /**
   * Check to see if the `ModalDialog` is closeable via the UI.
   *
   * @param  {boolean} [value]
   *         If given as a boolean, it will set the `closeable` option.
   *
   * @return {boolean}
   *         Returns the final value of the closable option.
   */
  closeable(value) {
    if (typeof value === 'boolean') {
      const closeable = this.closeable_ = !!value;
      let close = this.getChild('closeButton');

      // If this is being made closeable and has no close button, add one.
      if (closeable && !close) {
        // The close button should be a child of the modal - not its
        // content element, so temporarily change the content element.
        const temp = this.contentEl_;
        this.contentEl_ = this.el_;
        close = this.addChild('closeButton', {
          controlText: 'Close Modal Dialog'
        });
        this.contentEl_ = temp;
        this.on(close, 'close', this.close_);
      }

      // If this is being made uncloseable and has a close button, remove it.
      if (!closeable && close) {
        this.off(close, 'close', this.close_);
        this.removeChild(close);
        close.dispose();
      }
    }
    return this.closeable_;
  }

  /**
   * Fill the modal's content element with the modal's "content" option.
   * The content element will be emptied before this change takes place.
   */
  fill() {
    this.fillWith(this.content());
  }

  /**
   * Fill the modal's content element with arbitrary content.
   * The content element will be emptied before this change takes place.
   *
   * @fires ModalDialog#beforemodalfill
   * @fires ModalDialog#modalfill
   *
   * @param { import('./utils/dom').ContentDescriptor} [content]
   *        The same rules apply to this as apply to the `content` option.
   */
  fillWith(content) {
    const contentEl = this.contentEl();
    const parentEl = contentEl.parentNode;
    const nextSiblingEl = contentEl.nextSibling;

    /**
      * Fired just before a `ModalDialog` is filled with content.
      *
      * @event ModalDialog#beforemodalfill
      * @type {Event}
      */
    this.trigger('beforemodalfill');
    this.hasBeenFilled_ = true;

    // Detach the content element from the DOM before performing
    // manipulation to avoid modifying the live DOM multiple times.
    parentEl.removeChild(contentEl);
    this.empty();
    insertContent(contentEl, content);
    /**
     * Fired just after a `ModalDialog` is filled with content.
     *
     * @event ModalDialog#modalfill
     * @type {Event}
     */
    this.trigger('modalfill');

    // Re-inject the re-filled content element.
    if (nextSiblingEl) {
      parentEl.insertBefore(contentEl, nextSiblingEl);
    } else {
      parentEl.appendChild(contentEl);
    }

    // make sure that the close button is last in the dialog DOM
    const closeButton = this.getChild('closeButton');
    if (closeButton) {
      parentEl.appendChild(closeButton.el_);
    }
  }

  /**
   * Empties the content element. This happens anytime the modal is filled.
   *
   * @fires ModalDialog#beforemodalempty
   * @fires ModalDialog#modalempty
   */
  empty() {
    /**
    * Fired just before a `ModalDialog` is emptied.
    *
    * @event ModalDialog#beforemodalempty
    * @type {Event}
    */
    this.trigger('beforemodalempty');
    emptyEl(this.contentEl());

    /**
    * Fired just after a `ModalDialog` is emptied.
    *
    * @event ModalDialog#modalempty
    * @type {Event}
    */
    this.trigger('modalempty');
  }

  /**
   * Gets or sets the modal content, which gets normalized before being
   * rendered into the DOM.
   *
   * This does not update the DOM or fill the modal, but it is called during
   * that process.
   *
   * @param  { import('./utils/dom').ContentDescriptor} [value]
   *         If defined, sets the internal content value to be used on the
   *         next call(s) to `fill`. This value is normalized before being
   *         inserted. To "clear" the internal content value, pass `null`.
   *
   * @return { import('./utils/dom').ContentDescriptor}
   *         The current content of the modal dialog
   */
  content(value) {
    if (typeof value !== 'undefined') {
      this.content_ = value;
    }
    return this.content_;
  }

  /**
   * conditionally focus the modal dialog if focus was previously on the player.
   *
   * @private
   */
  conditionalFocus_() {
    const activeEl = document.activeElement;
    const playerEl = this.player_.el_;
    this.previouslyActiveEl_ = null;
    if (playerEl.contains(activeEl) || playerEl === activeEl) {
      this.previouslyActiveEl_ = activeEl;
      this.focus();
    }
  }

  /**
   * conditionally blur the element and refocus the last focused element
   *
   * @private
   */
  conditionalBlur_() {
    if (this.previouslyActiveEl_) {
      this.previouslyActiveEl_.focus();
      this.previouslyActiveEl_ = null;
    }
  }

  /**
   * Keydown handler. Attached when modal is focused.
   *
   * @listens keydown
   */
  handleKeyDown(event) {
    // Do not allow keydowns to reach out of the modal dialog.
    event.stopPropagation();
    if (keycode.isEventKey(event, 'Escape') && this.closeable()) {
      event.preventDefault();
      this.close();
      return;
    }

    // exit early if it isn't a tab key
    if (!keycode.isEventKey(event, 'Tab')) {
      return;
    }
    const focusableEls = this.focusableEls_();
    const activeEl = this.el_.querySelector(':focus');
    let focusIndex;
    for (let i = 0; i < focusableEls.length; i++) {
      if (activeEl === focusableEls[i]) {
        focusIndex = i;
        break;
      }
    }
    if (document.activeElement === this.el_) {
      focusIndex = 0;
    }
    if (event.shiftKey && focusIndex === 0) {
      focusableEls[focusableEls.length - 1].focus();
      event.preventDefault();
    } else if (!event.shiftKey && focusIndex === focusableEls.length - 1) {
      focusableEls[0].focus();
      event.preventDefault();
    }
  }

  /**
   * get all focusable elements
   *
   * @private
   */
  focusableEls_() {
    const allChildren = this.el_.querySelectorAll('*');
    return Array.prototype.filter.call(allChildren, child => {
      return (child instanceof window.HTMLAnchorElement || child instanceof window.HTMLAreaElement) && child.hasAttribute('href') || (child instanceof window.HTMLInputElement || child instanceof window.HTMLSelectElement || child instanceof window.HTMLTextAreaElement || child instanceof window.HTMLButtonElement) && !child.hasAttribute('disabled') || child instanceof window.HTMLIFrameElement || child instanceof window.HTMLObjectElement || child instanceof window.HTMLEmbedElement || child.hasAttribute('tabindex') && child.getAttribute('tabindex') !== -1 || child.hasAttribute('contenteditable');
    });
  }
}

/**
 * Default options for `ModalDialog` default options.
 *
 * @type {Object}
 * @private
 */
ModalDialog.prototype.options_ = {
  pauseOnOpen: true,
  temporary: true
};
Component.registerComponent('ModalDialog', ModalDialog);

/**
 * @file track-list.js
 */

/**
 * Common functionaliy between {@link TextTrackList}, {@link AudioTrackList}, and
 * {@link VideoTrackList}
 *
 * @extends EventTarget
 */
class TrackList extends EventTarget {
  /**
   * Create an instance of this class
   *
   * @param { import('./track').default[] } tracks
   *        A list of tracks to initialize the list with.
   *
   * @abstract
   */
  constructor(tracks = []) {
    super();
    this.tracks_ = [];

    /**
     * @memberof TrackList
     * @member {number} length
     *         The current number of `Track`s in the this Trackist.
     * @instance
     */
    Object.defineProperty(this, 'length', {
      get() {
        return this.tracks_.length;
      }
    });
    for (let i = 0; i < tracks.length; i++) {
      this.addTrack(tracks[i]);
    }
  }

  /**
   * Add a {@link Track} to the `TrackList`
   *
   * @param { import('./track').default } track
   *        The audio, video, or text track to add to the list.
   *
   * @fires TrackList#addtrack
   */
  addTrack(track) {
    const index = this.tracks_.length;
    if (!('' + index in this)) {
      Object.defineProperty(this, index, {
        get() {
          return this.tracks_[index];
        }
      });
    }

    // Do not add duplicate tracks
    if (this.tracks_.indexOf(track) === -1) {
      this.tracks_.push(track);
      /**
       * Triggered when a track is added to a track list.
       *
       * @event TrackList#addtrack
       * @type {Event}
       * @property {Track} track
       *           A reference to track that was added.
       */
      this.trigger({
        track,
        type: 'addtrack',
        target: this
      });
    }

    /**
     * Triggered when a track label is changed.
     *
     * @event TrackList#addtrack
     * @type {Event}
     * @property {Track} track
     *           A reference to track that was added.
     */
    track.labelchange_ = () => {
      this.trigger({
        track,
        type: 'labelchange',
        target: this
      });
    };
    if (isEvented(track)) {
      track.addEventListener('labelchange', track.labelchange_);
    }
  }

  /**
   * Remove a {@link Track} from the `TrackList`
   *
   * @param { import('./track').default } rtrack
   *        The audio, video, or text track to remove from the list.
   *
   * @fires TrackList#removetrack
   */
  removeTrack(rtrack) {
    let track;
    for (let i = 0, l = this.length; i < l; i++) {
      if (this[i] === rtrack) {
        track = this[i];
        if (track.off) {
          track.off();
        }
        this.tracks_.splice(i, 1);
        break;
      }
    }
    if (!track) {
      return;
    }

    /**
     * Triggered when a track is removed from track list.
     *
     * @event TrackList#removetrack
     * @type {Event}
     * @property {Track} track
     *           A reference to track that was removed.
     */
    this.trigger({
      track,
      type: 'removetrack',
      target: this
    });
  }

  /**
   * Get a Track from the TrackList by a tracks id
   *
   * @param {string} id - the id of the track to get
   * @method getTrackById
   * @return { import('./track').default }
   * @private
   */
  getTrackById(id) {
    let result = null;
    for (let i = 0, l = this.length; i < l; i++) {
      const track = this[i];
      if (track.id === id) {
        result = track;
        break;
      }
    }
    return result;
  }
}

/**
 * Triggered when a different track is selected/enabled.
 *
 * @event TrackList#change
 * @type {Event}
 */

/**
 * Events that can be called with on + eventName. See {@link EventHandler}.
 *
 * @property {Object} TrackList#allowedEvents_
 * @private
 */
TrackList.prototype.allowedEvents_ = {
  change: 'change',
  addtrack: 'addtrack',
  removetrack: 'removetrack',
  labelchange: 'labelchange'
};

// emulate attribute EventHandler support to allow for feature detection
for (const event in TrackList.prototype.allowedEvents_) {
  TrackList.prototype['on' + event] = null;
}

/**
 * @file audio-track-list.js
 */

/**
 * Anywhere we call this function we diverge from the spec
 * as we only support one enabled audiotrack at a time
 *
 * @param {AudioTrackList} list
 *        list to work on
 *
 * @param { import('./audio-track').default } track
 *        The track to skip
 *
 * @private
 */
const disableOthers$1 = function (list, track) {
  for (let i = 0; i < list.length; i++) {
    if (!Object.keys(list[i]).length || track.id === list[i].id) {
      continue;
    }
    // another audio track is enabled, disable it
    list[i].enabled = false;
  }
};

/**
 * The current list of {@link AudioTrack} for a media file.
 *
 * @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#audiotracklist}
 * @extends TrackList
 */
class AudioTrackList extends TrackList {
  /**
   * Create an instance of this class.
   *
   * @param {AudioTrack[]} [tracks=[]]
   *        A list of `AudioTrack` to instantiate the list with.
   */
  constructor(tracks = []) {
    // make sure only 1 track is enabled
    // sorted from last index to first index
    for (let i = tracks.length - 1; i >= 0; i--) {
      if (tracks[i].enabled) {
        disableOthers$1(tracks, tracks[i]);
        break;
      }
    }
    super(tracks);
    this.changing_ = false;
  }

  /**
   * Add an {@link AudioTrack} to the `AudioTrackList`.
   *
   * @param { import('./audio-track').default } track
   *        The AudioTrack to add to the list
   *
   * @fires TrackList#addtrack
   */
  addTrack(track) {
    if (track.enabled) {
      disableOthers$1(this, track);
    }
    super.addTrack(track);
    // native tracks don't have this
    if (!track.addEventListener) {
      return;
    }
    track.enabledChange_ = () => {
      // when we are disabling other tracks (since we don't support
      // more than one track at a time) we will set changing_
      // to true so that we don't trigger additional change events
      if (this.changing_) {
        return;
      }
      this.changing_ = true;
      disableOthers$1(this, track);
      this.changing_ = false;
      this.trigger('change');
    };

    /**
     * @listens AudioTrack#enabledchange
     * @fires TrackList#change
     */
    track.addEventListener('enabledchange', track.enabledChange_);
  }
  removeTrack(rtrack) {
    super.removeTrack(rtrack);
    if (rtrack.removeEventListener && rtrack.enabledChange_) {
      rtrack.removeEventListener('enabledchange', rtrack.enabledChange_);
      rtrack.enabledChange_ = null;
    }
  }
}

/**
 * @file video-track-list.js
 */

/**
 * Un-select all other {@link VideoTrack}s that are selected.
 *
 * @param {VideoTrackList} list
 *        list to work on
 *
 * @param { import('./video-track').default } track
 *        The track to skip
 *
 * @private
 */
const disableOthers = function (list, track) {
  for (let i = 0; i < list.length; i++) {
    if (!Object.keys(list[i]).length || track.id === list[i].id) {
      continue;
    }
    // another video track is enabled, disable it
    list[i].selected = false;
  }
};

/**
 * The current list of {@link VideoTrack} for a video.
 *
 * @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#videotracklist}
 * @extends TrackList
 */
class VideoTrackList extends TrackList {
  /**
   * Create an instance of this class.
   *
   * @param {VideoTrack[]} [tracks=[]]
   *        A list of `VideoTrack` to instantiate the list with.
   */
  constructor(tracks = []) {
    // make sure only 1 track is enabled
    // sorted from last index to first index
    for (let i = tracks.length - 1; i >= 0; i--) {
      if (tracks[i].selected) {
        disableOthers(tracks, tracks[i]);
        break;
      }
    }
    super(tracks);
    this.changing_ = false;

    /**
     * @member {number} VideoTrackList#selectedIndex
     *         The current index of the selected {@link VideoTrack`}.
     */
    Object.defineProperty(this, 'selectedIndex', {
      get() {
        for (let i = 0; i < this.length; i++) {
          if (this[i].selected) {
            return i;
          }
        }
        return -1;
      },
      set() {}
    });
  }

  /**
   * Add a {@link VideoTrack} to the `VideoTrackList`.
   *
   * @param { import('./video-track').default } track
   *        The VideoTrack to add to the list
   *
   * @fires TrackList#addtrack
   */
  addTrack(track) {
    if (track.selected) {
      disableOthers(this, track);
    }
    super.addTrack(track);
    // native tracks don't have this
    if (!track.addEventListener) {
      return;
    }
    track.selectedChange_ = () => {
      if (this.changing_) {
        return;
      }
      this.changing_ = true;
      disableOthers(this, track);
      this.changing_ = false;
      this.trigger('change');
    };

    /**
     * @listens VideoTrack#selectedchange
     * @fires TrackList#change
     */
    track.addEventListener('selectedchange', track.selectedChange_);
  }
  removeTrack(rtrack) {
    super.removeTrack(rtrack);
    if (rtrack.removeEventListener && rtrack.selectedChange_) {
      rtrack.removeEventListener('selectedchange', rtrack.selectedChange_);
      rtrack.selectedChange_ = null;
    }
  }
}

/**
 * @file text-track-list.js
 */

/**
 * The current list of {@link TextTrack} for a media file.
 *
 * @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#texttracklist}
 * @extends TrackList
 */
class TextTrackList extends TrackList {
  /**
   * Add a {@link TextTrack} to the `TextTrackList`
   *
   * @param { import('./text-track').default } track
   *        The text track to add to the list.
   *
   * @fires TrackList#addtrack
   */
  addTrack(track) {
    super.addTrack(track);
    if (!this.queueChange_) {
      this.queueChange_ = () => this.queueTrigger('change');
    }
    if (!this.triggerSelectedlanguagechange) {
      this.triggerSelectedlanguagechange_ = () => this.trigger('selectedlanguagechange');
    }

    /**
     * @listens TextTrack#modechange
     * @fires TrackList#change
     */
    track.addEventListener('modechange', this.queueChange_);
    const nonLanguageTextTrackKind = ['metadata', 'chapters'];
    if (nonLanguageTextTrackKind.indexOf(track.kind) === -1) {
      track.addEventListener('modechange', this.triggerSelectedlanguagechange_);
    }
  }
  removeTrack(rtrack) {
    super.removeTrack(rtrack);

    // manually remove the event handlers we added
    if (rtrack.removeEventListener) {
      if (this.queueChange_) {
        rtrack.removeEventListener('modechange', this.queueChange_);
      }
      if (this.selectedlanguagechange_) {
        rtrack.removeEventListener('modechange', this.triggerSelectedlanguagechange_);
      }
    }
  }
}

/**
 * @file html-track-element-list.js
 */

/**
 * The current list of {@link HtmlTrackElement}s.
 */
class HtmlTrackElementList {
  /**
   * Create an instance of this class.
   *
   * @param {HtmlTrackElement[]} [tracks=[]]
   *        A list of `HtmlTrackElement` to instantiate the list with.
   */
  constructor(trackElements = []) {
    this.trackElements_ = [];

    /**
     * @memberof HtmlTrackElementList
     * @member {number} length
     *         The current number of `Track`s in the this Trackist.
     * @instance
     */
    Object.defineProperty(this, 'length', {
      get() {
        return this.trackElements_.length;
      }
    });
    for (let i = 0, length = trackElements.length; i < length; i++) {
      this.addTrackElement_(trackElements[i]);
    }
  }

  /**
   * Add an {@link HtmlTrackElement} to the `HtmlTrackElementList`
   *
   * @param {HtmlTrackElement} trackElement
   *        The track element to add to the list.
   *
   * @private
   */
  addTrackElement_(trackElement) {
    const index = this.trackElements_.length;
    if (!('' + index in this)) {
      Object.defineProperty(this, index, {
        get() {
          return this.trackElements_[index];
        }
      });
    }

    // Do not add duplicate elements
    if (this.trackElements_.indexOf(trackElement) === -1) {
      this.trackElements_.push(trackElement);
    }
  }

  /**
   * Get an {@link HtmlTrackElement} from the `HtmlTrackElementList` given an
   * {@link TextTrack}.
   *
   * @param {TextTrack} track
   *        The track associated with a track element.
   *
   * @return {HtmlTrackElement|undefined}
   *         The track element that was found or undefined.
   *
   * @private
   */
  getTrackElementByTrack_(track) {
    let trackElement_;
    for (let i = 0, length = this.trackElements_.length; i < length; i++) {
      if (track === this.trackElements_[i].track) {
        trackElement_ = this.trackElements_[i];
        break;
      }
    }
    return trackElement_;
  }

  /**
   * Remove a {@link HtmlTrackElement} from the `HtmlTrackElementList`
   *
   * @param {HtmlTrackElement} trackElement
   *        The track element to remove from the list.
   *
   * @private
   */
  removeTrackElement_(trackElement) {
    for (let i = 0, length = this.trackElements_.length; i < length; i++) {
      if (trackElement === this.trackElements_[i]) {
        if (this.trackElements_[i].track && typeof this.trackElements_[i].track.off === 'function') {
          this.trackElements_[i].track.off();
        }
        if (typeof this.trackElements_[i].off === 'function') {
          this.trackElements_[i].off();
        }
        this.trackElements_.splice(i, 1);
        break;
      }
    }
  }
}

/**
 * @file text-track-cue-list.js
 */

/**
 * @typedef {Object} TextTrackCueList~TextTrackCue
 *
 * @property {string} id
 *           The unique id for this text track cue
 *
 * @property {number} startTime
 *           The start time for this text track cue
 *
 * @property {number} endTime
 *           The end time for this text track cue
 *
 * @property {boolean} pauseOnExit
 *           Pause when the end time is reached if true.
 *
 * @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#texttrackcue}
 */

/**
 * A List of TextTrackCues.
 *
 * @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#texttrackcuelist}
 */
class TextTrackCueList {
  /**
   * Create an instance of this class..
   *
   * @param {Array} cues
   *        A list of cues to be initialized with
   */
  constructor(cues) {
    TextTrackCueList.prototype.setCues_.call(this, cues);

    /**
     * @memberof TextTrackCueList
     * @member {number} length
     *         The current number of `TextTrackCue`s in the TextTrackCueList.
     * @instance
     */
    Object.defineProperty(this, 'length', {
      get() {
        return this.length_;
      }
    });
  }

  /**
   * A setter for cues in this list. Creates getters
   * an an index for the cues.
   *
   * @param {Array} cues
   *        An array of cues to set
   *
   * @private
   */
  setCues_(cues) {
    const oldLength = this.length || 0;
    let i = 0;
    const l = cues.length;
    this.cues_ = cues;
    this.length_ = cues.length;
    const defineProp = function (index) {
      if (!('' + index in this)) {
        Object.defineProperty(this, '' + index, {
          get() {
            return this.cues_[index];
          }
        });
      }
    };
    if (oldLength < l) {
      i = oldLength;
      for (; i < l; i++) {
        defineProp.call(this, i);
      }
    }
  }

  /**
   * Get a `TextTrackCue` that is currently in the `TextTrackCueList` by id.
   *
   * @param {string} id
   *        The id of the cue that should be searched for.
   *
   * @return {TextTrackCueList~TextTrackCue|null}
   *         A single cue or null if none was found.
   */
  getCueById(id) {
    let result = null;
    for (let i = 0, l = this.length; i < l; i++) {
      const cue = this[i];
      if (cue.id === id) {
        result = cue;
        break;
      }
    }
    return result;
  }
}

/**
 * @file track-kinds.js
 */

/**
 * All possible `VideoTrackKind`s
 *
 * @see https://html.spec.whatwg.org/multipage/embedded-content.html#dom-videotrack-kind
 * @typedef VideoTrack~Kind
 * @enum
 */
const VideoTrackKind = {
  alternative: 'alternative',
  captions: 'captions',
  main: 'main',
  sign: 'sign',
  subtitles: 'subtitles',
  commentary: 'commentary'
};

/**
 * All possible `AudioTrackKind`s
 *
 * @see https://html.spec.whatwg.org/multipage/embedded-content.html#dom-audiotrack-kind
 * @typedef AudioTrack~Kind
 * @enum
 */
const AudioTrackKind = {
  'alternative': 'alternative',
  'descriptions': 'descriptions',
  'main': 'main',
  'main-desc': 'main-desc',
  'translation': 'translation',
  'commentary': 'commentary'
};

/**
 * All possible `TextTrackKind`s
 *
 * @see https://html.spec.whatwg.org/multipage/embedded-content.html#dom-texttrack-kind
 * @typedef TextTrack~Kind
 * @enum
 */
const TextTrackKind = {
  subtitles: 'subtitles',
  captions: 'captions',
  descriptions: 'descriptions',
  chapters: 'chapters',
  metadata: 'metadata'
};

/**
 * All possible `TextTrackMode`s
 *
 * @see https://html.spec.whatwg.org/multipage/embedded-content.html#texttrackmode
 * @typedef TextTrack~Mode
 * @enum
 */
const TextTrackMode = {
  disabled: 'disabled',
  hidden: 'hidden',
  showing: 'showing'
};

/**
 * @file track.js
 */

/**
 * A Track class that contains all of the common functionality for {@link AudioTrack},
 * {@link VideoTrack}, and {@link TextTrack}.
 *
 * > Note: This class should not be used directly
 *
 * @see {@link https://html.spec.whatwg.org/multipage/embedded-content.html}
 * @extends EventTarget
 * @abstract
 */
class Track extends EventTarget {
  /**
   * Create an instance of this class.
   *
   * @param {Object} [options={}]
   *        Object of option names and values
   *
   * @param {string} [options.kind='']
   *        A valid kind for the track type you are creating.
   *
   * @param {string} [options.id='vjs_track_' + Guid.newGUID()]
   *        A unique id for this AudioTrack.
   *
   * @param {string} [options.label='']
   *        The menu label for this track.
   *
   * @param {string} [options.language='']
   *        A valid two character language code.
   *
   * @abstract
   */
  constructor(options = {}) {
    super();
    const trackProps = {
      id: options.id || 'vjs_track_' + newGUID(),
      kind: options.kind || '',
      language: options.language || ''
    };
    let label = options.label || '';

    /**
     * @memberof Track
     * @member {string} id
     *         The id of this track. Cannot be changed after creation.
     * @instance
     *
     * @readonly
     */

    /**
     * @memberof Track
     * @member {string} kind
     *         The kind of track that this is. Cannot be changed after creation.
     * @instance
     *
     * @readonly
     */

    /**
     * @memberof Track
     * @member {string} language
     *         The two letter language code for this track. Cannot be changed after
     *         creation.
     * @instance
     *
     * @readonly
     */

    for (const key in trackProps) {
      Object.defineProperty(this, key, {
        get() {
          return trackProps[key];
        },
        set() {}
      });
    }

    /**
     * @memberof Track
     * @member {string} label
     *         The label of this track. Cannot be changed after creation.
     * @instance
     *
     * @fires Track#labelchange
     */
    Object.defineProperty(this, 'label', {
      get() {
        return label;
      },
      set(newLabel) {
        if (newLabel !== label) {
          label = newLabel;

          /**
           * An event that fires when label changes on this track.
           *
           * > Note: This is not part of the spec!
           *
           * @event Track#labelchange
           * @type {Event}
           */
          this.trigger('labelchange');
        }
      }
    });
  }
}

/**
 * @file url.js
 * @module url
 */

/**
 * @typedef {Object} url:URLObject
 *
 * @property {string} protocol
 *           The protocol of the url that was parsed.
 *
 * @property {string} hostname
 *           The hostname of the url that was parsed.
 *
 * @property {string} port
 *           The port of the url that was parsed.
 *
 * @property {string} pathname
 *           The pathname of the url that was parsed.
 *
 * @property {string} search
 *           The search query of the url that was parsed.
 *
 * @property {string} hash
 *           The hash of the url that was parsed.
 *
 * @property {string} host
 *           The host of the url that was parsed.
 */

/**
 * Resolve and parse the elements of a URL.
 *
 * @function
 * @param    {String} url
 *           The url to parse
 *
 * @return   {url:URLObject}
 *           An object of url details
 */
const parseUrl = function (url) {
  // This entire method can be replace with URL once we are able to drop IE11

  const props = ['protocol', 'hostname', 'port', 'pathname', 'search', 'hash', 'host'];

  // add the url to an anchor and let the browser parse the URL
  const a = document.createElement('a');
  a.href = url;

  // Copy the specific URL properties to a new object
  // This is also needed for IE because the anchor loses its
  // properties when it's removed from the dom
  const details = {};
  for (let i = 0; i < props.length; i++) {
    details[props[i]] = a[props[i]];
  }

  // IE adds the port to the host property unlike everyone else. If
  // a port identifier is added for standard ports, strip it.
  if (details.protocol === 'http:') {
    details.host = details.host.replace(/:80$/, '');
  }
  if (details.protocol === 'https:') {
    details.host = details.host.replace(/:443$/, '');
  }
  if (!details.protocol) {
    details.protocol = window.location.protocol;
  }

  /* istanbul ignore if */
  if (!details.host) {
    details.host = window.location.host;
  }
  return details;
};

/**
 * Get absolute version of relative URL.
 *
 * @function
 * @param    {string} url
 *           URL to make absolute
 *
 * @return   {string}
 *           Absolute URL
 *
 * @see      http://stackoverflow.com/questions/470832/getting-an-absolute-url-from-a-relative-one-ie6-issue
 */
const getAbsoluteURL = function (url) {
  // Check if absolute URL
  if (!url.match(/^https?:\/\//)) {
    // Add the url to an anchor and let the browser parse it to convert to an absolute url
    const a = document.createElement('a');
    a.href = url;
    url = a.href;
  }
  return url;
};

/**
 * Returns the extension of the passed file name. It will return an empty string
 * if passed an invalid path.
 *
 * @function
 * @param    {string} path
 *           The fileName path like '/path/to/file.mp4'
 *
 * @return  {string}
 *           The extension in lower case or an empty string if no
 *           extension could be found.
 */
const getFileExtension = function (path) {
  if (typeof path === 'string') {
    const splitPathRe = /^(\/?)([\s\S]*?)((?:\.{1,2}|[^\/]+?)(\.([^\.\/\?]+)))(?:[\/]*|[\?].*)$/;
    const pathParts = splitPathRe.exec(path);
    if (pathParts) {
      return pathParts.pop().toLowerCase();
    }
  }
  return '';
};

/**
 * Returns whether the url passed is a cross domain request or not.
 *
 * @function
 * @param    {string} url
 *           The url to check.
 *
 * @param    {Object} [winLoc]
 *           the domain to check the url against, defaults to window.location
 *
 * @param    {string} [winLoc.protocol]
 *           The window location protocol defaults to window.location.protocol
 *
 * @param    {string} [winLoc.host]
 *           The window location host defaults to window.location.host
 *
 * @return   {boolean}
 *           Whether it is a cross domain request or not.
 */
const isCrossOrigin = function (url, winLoc = window.location) {
  const urlInfo = parseUrl(url);

  // IE8 protocol relative urls will return ':' for protocol
  const srcProtocol = urlInfo.protocol === ':' ? winLoc.protocol : urlInfo.protocol;

  // Check if url is for another domain/origin
  // IE8 doesn't know location.origin, so we won't rely on it here
  const crossOrigin = srcProtocol + urlInfo.host !== winLoc.protocol + winLoc.host;
  return crossOrigin;
};

var Url = /*#__PURE__*/Object.freeze({
  __proto__: null,
  parseUrl: parseUrl,
  getAbsoluteURL: getAbsoluteURL,
  getFileExtension: getFileExtension,
  isCrossOrigin: isCrossOrigin
});

/**
 * @file text-track.js
 */

/**
 * Takes a webvtt file contents and parses it into cues
 *
 * @param {string} srcContent
 *        webVTT file contents
 *
 * @param {TextTrack} track
 *        TextTrack to add cues to. Cues come from the srcContent.
 *
 * @private
 */
const parseCues = function (srcContent, track) {
  const parser = new window.WebVTT.Parser(window, window.vttjs, window.WebVTT.StringDecoder());
  const errors = [];
  parser.oncue = function (cue) {
    track.addCue(cue);
  };
  parser.onparsingerror = function (error) {
    errors.push(error);
  };
  parser.onflush = function () {
    track.trigger({
      type: 'loadeddata',
      target: track
    });
  };
  parser.parse(srcContent);
  if (errors.length > 0) {
    if (window.console && window.console.groupCollapsed) {
      window.console.groupCollapsed(`Text Track parsing errors for ${track.src}`);
    }
    errors.forEach(error => log.error(error));
    if (window.console && window.console.groupEnd) {
      window.console.groupEnd();
    }
  }
  parser.flush();
};

/**
 * Load a `TextTrack` from a specified url.
 *
 * @param {string} src
 *        Url to load track from.
 *
 * @param {TextTrack} track
 *        Track to add cues to. Comes from the content at the end of `url`.
 *
 * @private
 */
const loadTrack = function (src, track) {
  const opts = {
    uri: src
  };
  const crossOrigin = isCrossOrigin(src);
  if (crossOrigin) {
    opts.cors = crossOrigin;
  }
  const withCredentials = track.tech_.crossOrigin() === 'use-credentials';
  if (withCredentials) {
    opts.withCredentials = withCredentials;
  }
  XHR(opts, bind_(this, function (err, response, responseBody) {
    if (err) {
      return log.error(err, response);
    }
    track.loaded_ = true;

    // Make sure that vttjs has loaded, otherwise, wait till it finished loading
    // NOTE: this is only used for the alt/video.novtt.js build
    if (typeof window.WebVTT !== 'function') {
      if (track.tech_) {
        // to prevent use before define eslint error, we define loadHandler
        // as a let here
        track.tech_.any(['vttjsloaded', 'vttjserror'], event => {
          if (event.type === 'vttjserror') {
            log.error(`vttjs failed to load, stopping trying to process ${track.src}`);
            return;
          }
          return parseCues(responseBody, track);
        });
      }
    } else {
      parseCues(responseBody, track);
    }
  }));
};

/**
 * A representation of a single `TextTrack`.
 *
 * @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#texttrack}
 * @extends Track
 */
class TextTrack extends Track {
  /**
   * Create an instance of this class.
   *
   * @param {Object} options={}
   *        Object of option names and values
   *
   * @param { import('../tech/tech').default } options.tech
   *        A reference to the tech that owns this TextTrack.
   *
   * @param {TextTrack~Kind} [options.kind='subtitles']
   *        A valid text track kind.
   *
   * @param {TextTrack~Mode} [options.mode='disabled']
   *        A valid text track mode.
   *
   * @param {string} [options.id='vjs_track_' + Guid.newGUID()]
   *        A unique id for this TextTrack.
   *
   * @param {string} [options.label='']
   *        The menu label for this track.
   *
   * @param {string} [options.language='']
   *        A valid two character language code.
   *
   * @param {string} [options.srclang='']
   *        A valid two character language code. An alternative, but deprioritized
   *        version of `options.language`
   *
   * @param {string} [options.src]
   *        A url to TextTrack cues.
   *
   * @param {boolean} [options.default]
   *        If this track should default to on or off.
   */
  constructor(options = {}) {
    if (!options.tech) {
      throw new Error('A tech was not provided.');
    }
    const settings = merge(options, {
      kind: TextTrackKind[options.kind] || 'subtitles',
      language: options.language || options.srclang || ''
    });
    let mode = TextTrackMode[settings.mode] || 'disabled';
    const default_ = settings.default;
    if (settings.kind === 'metadata' || settings.kind === 'chapters') {
      mode = 'hidden';
    }
    super(settings);
    this.tech_ = settings.tech;
    this.cues_ = [];
    this.activeCues_ = [];
    this.preload_ = this.tech_.preloadTextTracks !== false;
    const cues = new TextTrackCueList(this.cues_);
    const activeCues = new TextTrackCueList(this.activeCues_);
    let changed = false;
    this.timeupdateHandler = bind_(this, function (event = {}) {
      if (this.tech_.isDisposed()) {
        return;
      }
      if (!this.tech_.isReady_) {
        if (event.type !== 'timeupdate') {
          this.rvf_ = this.tech_.requestVideoFrameCallback(this.timeupdateHandler);
        }
        return;
      }

      // Accessing this.activeCues for the side-effects of updating itself
      // due to its nature as a getter function. Do not remove or cues will
      // stop updating!
      // Use the setter to prevent deletion from uglify (pure_getters rule)
      this.activeCues = this.activeCues;
      if (changed) {
        this.trigger('cuechange');
        changed = false;
      }
      if (event.type !== 'timeupdate') {
        this.rvf_ = this.tech_.requestVideoFrameCallback(this.timeupdateHandler);
      }
    });
    const disposeHandler = () => {
      this.stopTracking();
    };
    this.tech_.one('dispose', disposeHandler);
    if (mode !== 'disabled') {
      this.startTracking();
    }
    Object.defineProperties(this, {
      /**
       * @memberof TextTrack
       * @member {boolean} default
       *         If this track was set to be on or off by default. Cannot be changed after
       *         creation.
       * @instance
       *
       * @readonly
       */
      default: {
        get() {
          return default_;
        },
        set() {}
      },
      /**
       * @memberof TextTrack
       * @member {string} mode
       *         Set the mode of this TextTrack to a valid {@link TextTrack~Mode}. Will
       *         not be set if setting to an invalid mode.
       * @instance
       *
       * @fires TextTrack#modechange
       */
      mode: {
        get() {
          return mode;
        },
        set(newMode) {
          if (!TextTrackMode[newMode]) {
            return;
          }
          if (mode === newMode) {
            return;
          }
          mode = newMode;
          if (!this.preload_ && mode !== 'disabled' && this.cues.length === 0) {
            // On-demand load.
            loadTrack(this.src, this);
          }
          this.stopTracking();
          if (mode !== 'disabled') {
            this.startTracking();
          }
          /**
           * An event that fires when mode changes on this track. This allows
           * the TextTrackList that holds this track to act accordingly.
           *
           * > Note: This is not part of the spec!
           *
           * @event TextTrack#modechange
           * @type {Event}
           */
          this.trigger('modechange');
        }
      },
      /**
       * @memberof TextTrack
       * @member {TextTrackCueList} cues
       *         The text track cue list for this TextTrack.
       * @instance
       */
      cues: {
        get() {
          if (!this.loaded_) {
            return null;
          }
          return cues;
        },
        set() {}
      },
      /**
       * @memberof TextTrack
       * @member {TextTrackCueList} activeCues
       *         The list text track cues that are currently active for this TextTrack.
       * @instance
       */
      activeCues: {
        get() {
          if (!this.loaded_) {
            return null;
          }

          // nothing to do
          if (this.cues.length === 0) {
            return activeCues;
          }
          const ct = this.tech_.currentTime();
          const active = [];
          for (let i = 0, l = this.cues.length; i < l; i++) {
            const cue = this.cues[i];
            if (cue.startTime <= ct && cue.endTime >= ct) {
              active.push(cue);
            }
          }
          changed = false;
          if (active.length !== this.activeCues_.length) {
            changed = true;
          } else {
            for (let i = 0; i < active.length; i++) {
              if (this.activeCues_.indexOf(active[i]) === -1) {
                changed = true;
              }
            }
          }
          this.activeCues_ = active;
          activeCues.setCues_(this.activeCues_);
          return activeCues;
        },
        // /!\ Keep this setter empty (see the timeupdate handler above)
        set() {}
      }
    });
    if (settings.src) {
      this.src = settings.src;
      if (!this.preload_) {
        // Tracks will load on-demand.
        // Act like we're loaded for other purposes.
        this.loaded_ = true;
      }
      if (this.preload_ || settings.kind !== 'subtitles' && settings.kind !== 'captions') {
        loadTrack(this.src, this);
      }
    } else {
      this.loaded_ = true;
    }
  }
  startTracking() {
    // More precise cues based on requestVideoFrameCallback with a requestAnimationFram fallback
    this.rvf_ = this.tech_.requestVideoFrameCallback(this.timeupdateHandler);
    // Also listen to timeupdate in case rVFC/rAF stops (window in background, audio in video el)
    this.tech_.on('timeupdate', this.timeupdateHandler);
  }
  stopTracking() {
    if (this.rvf_) {
      this.tech_.cancelVideoFrameCallback(this.rvf_);
      this.rvf_ = undefined;
    }
    this.tech_.off('timeupdate', this.timeupdateHandler);
  }

  /**
   * Add a cue to the internal list of cues.
   *
   * @param {TextTrack~Cue} cue
   *        The cue to add to our internal list
   */
  addCue(originalCue) {
    let cue = originalCue;
    if (window.vttjs && !(originalCue instanceof window.vttjs.VTTCue)) {
      cue = new window.vttjs.VTTCue(originalCue.startTime, originalCue.endTime, originalCue.text);
      for (const prop in originalCue) {
        if (!(prop in cue)) {
          cue[prop] = originalCue[prop];
        }
      }

      // make sure that `id` is copied over
      cue.id = originalCue.id;
      cue.originalCue_ = originalCue;
    }
    const tracks = this.tech_.textTracks();
    for (let i = 0; i < tracks.length; i++) {
      if (tracks[i] !== this) {
        tracks[i].removeCue(cue);
      }
    }
    this.cues_.push(cue);
    this.cues.setCues_(this.cues_);
  }

  /**
   * Remove a cue from our internal list
   *
   * @param {TextTrack~Cue} removeCue
   *        The cue to remove from our internal list
   */
  removeCue(removeCue) {
    let i = this.cues_.length;
    while (i--) {
      const cue = this.cues_[i];
      if (cue === removeCue || cue.originalCue_ && cue.originalCue_ === removeCue) {
        this.cues_.splice(i, 1);
        this.cues.setCues_(this.cues_);
        break;
      }
    }
  }
}

/**
 * cuechange - One or more cues in the track have become active or stopped being active.
 */
TextTrack.prototype.allowedEvents_ = {
  cuechange: 'cuechange'
};

/**
 * A representation of a single `AudioTrack`. If it is part of an {@link AudioTrackList}
 * only one `AudioTrack` in the list will be enabled at a time.
 *
 * @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#audiotrack}
 * @extends Track
 */
class AudioTrack extends Track {
  /**
   * Create an instance of this class.
   *
   * @param {Object} [options={}]
   *        Object of option names and values
   *
   * @param {AudioTrack~Kind} [options.kind='']
   *        A valid audio track kind
   *
   * @param {string} [options.id='vjs_track_' + Guid.newGUID()]
   *        A unique id for this AudioTrack.
   *
   * @param {string} [options.label='']
   *        The menu label for this track.
   *
   * @param {string} [options.language='']
   *        A valid two character language code.
   *
   * @param {boolean} [options.enabled]
   *        If this track is the one that is currently playing. If this track is part of
   *        an {@link AudioTrackList}, only one {@link AudioTrack} will be enabled.
   */
  constructor(options = {}) {
    const settings = merge(options, {
      kind: AudioTrackKind[options.kind] || ''
    });
    super(settings);
    let enabled = false;

    /**
     * @memberof AudioTrack
     * @member {boolean} enabled
     *         If this `AudioTrack` is enabled or not. When setting this will
     *         fire {@link AudioTrack#enabledchange} if the state of enabled is changed.
     * @instance
     *
     * @fires VideoTrack#selectedchange
     */
    Object.defineProperty(this, 'enabled', {
      get() {
        return enabled;
      },
      set(newEnabled) {
        // an invalid or unchanged value
        if (typeof newEnabled !== 'boolean' || newEnabled === enabled) {
          return;
        }
        enabled = newEnabled;

        /**
         * An event that fires when enabled changes on this track. This allows
         * the AudioTrackList that holds this track to act accordingly.
         *
         * > Note: This is not part of the spec! Native tracks will do
         *         this internally without an event.
         *
         * @event AudioTrack#enabledchange
         * @type {Event}
         */
        this.trigger('enabledchange');
      }
    });

    // if the user sets this track to selected then
    // set selected to that true value otherwise
    // we keep it false
    if (settings.enabled) {
      this.enabled = settings.enabled;
    }
    this.loaded_ = true;
  }
}

/**
 * A representation of a single `VideoTrack`.
 *
 * @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#videotrack}
 * @extends Track
 */
class VideoTrack extends Track {
  /**
   * Create an instance of this class.
   *
   * @param {Object} [options={}]
   *        Object of option names and values
   *
   * @param {string} [options.kind='']
   *        A valid {@link VideoTrack~Kind}
   *
   * @param {string} [options.id='vjs_track_' + Guid.newGUID()]
   *        A unique id for this AudioTrack.
   *
   * @param {string} [options.label='']
   *        The menu label for this track.
   *
   * @param {string} [options.language='']
   *        A valid two character language code.
   *
   * @param {boolean} [options.selected]
   *        If this track is the one that is currently playing.
   */
  constructor(options = {}) {
    const settings = merge(options, {
      kind: VideoTrackKind[options.kind] || ''
    });
    super(settings);
    let selected = false;

    /**
     * @memberof VideoTrack
     * @member {boolean} selected
     *         If this `VideoTrack` is selected or not. When setting this will
     *         fire {@link VideoTrack#selectedchange} if the state of selected changed.
     * @instance
     *
     * @fires VideoTrack#selectedchange
     */
    Object.defineProperty(this, 'selected', {
      get() {
        return selected;
      },
      set(newSelected) {
        // an invalid or unchanged value
        if (typeof newSelected !== 'boolean' || newSelected === selected) {
          return;
        }
        selected = newSelected;

        /**
         * An event that fires when selected changes on this track. This allows
         * the VideoTrackList that holds this track to act accordingly.
         *
         * > Note: This is not part of the spec! Native tracks will do
         *         this internally without an event.
         *
         * @event VideoTrack#selectedchange
         * @type {Event}
         */
        this.trigger('selectedchange');
      }
    });

    // if the user sets this track to selected then
    // set selected to that true value otherwise
    // we keep it false
    if (settings.selected) {
      this.selected = settings.selected;
    }
  }
}

/**
 * @file html-track-element.js
 */

/**
 * A single track represented in the DOM.
 *
 * @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#htmltrackelement}
 * @extends EventTarget
 */
class HTMLTrackElement extends EventTarget {
  /**
   * Create an instance of this class.
   *
   * @param {Object} options={}
   *        Object of option names and values
   *
   * @param { import('../tech/tech').default } options.tech
   *        A reference to the tech that owns this HTMLTrackElement.
   *
   * @param {TextTrack~Kind} [options.kind='subtitles']
   *        A valid text track kind.
   *
   * @param {TextTrack~Mode} [options.mode='disabled']
   *        A valid text track mode.
   *
   * @param {string} [options.id='vjs_track_' + Guid.newGUID()]
   *        A unique id for this TextTrack.
   *
   * @param {string} [options.label='']
   *        The menu label for this track.
   *
   * @param {string} [options.language='']
   *        A valid two character language code.
   *
   * @param {string} [options.srclang='']
   *        A valid two character language code. An alternative, but deprioritized
   *        version of `options.language`
   *
   * @param {string} [options.src]
   *        A url to TextTrack cues.
   *
   * @param {boolean} [options.default]
   *        If this track should default to on or off.
   */
  constructor(options = {}) {
    super();
    let readyState;
    const track = new TextTrack(options);
    this.kind = track.kind;
    this.src = track.src;
    this.srclang = track.language;
    this.label = track.label;
    this.default = track.default;
    Object.defineProperties(this, {
      /**
       * @memberof HTMLTrackElement
       * @member {HTMLTrackElement~ReadyState} readyState
       *         The current ready state of the track element.
       * @instance
       */
      readyState: {
        get() {
          return readyState;
        }
      },
      /**
       * @memberof HTMLTrackElement
       * @member {TextTrack} track
       *         The underlying TextTrack object.
       * @instance
       *
       */
      track: {
        get() {
          return track;
        }
      }
    });
    readyState = HTMLTrackElement.NONE;

    /**
     * @listens TextTrack#loadeddata
     * @fires HTMLTrackElement#load
     */
    track.addEventListener('loadeddata', () => {
      readyState = HTMLTrackElement.LOADED;
      this.trigger({
        type: 'load',
        target: this
      });
    });
  }
}
HTMLTrackElement.prototype.allowedEvents_ = {
  load: 'load'
};

/**
 * The text track not loaded state.
 *
 * @type {number}
 * @static
 */
HTMLTrackElement.NONE = 0;

/**
 * The text track loading state.
 *
 * @type {number}
 * @static
 */
HTMLTrackElement.LOADING = 1;

/**
 * The text track loaded state.
 *
 * @type {number}
 * @static
 */
HTMLTrackElement.LOADED = 2;

/**
 * The text track failed to load state.
 *
 * @type {number}
 * @static
 */
HTMLTrackElement.ERROR = 3;

/*
 * This file contains all track properties that are used in
 * player.js, tech.js, html5.js and possibly other techs in the future.
 */

const NORMAL = {
  audio: {
    ListClass: AudioTrackList,
    TrackClass: AudioTrack,
    capitalName: 'Audio'
  },
  video: {
    ListClass: VideoTrackList,
    TrackClass: VideoTrack,
    capitalName: 'Video'
  },
  text: {
    ListClass: TextTrackList,
    TrackClass: TextTrack,
    capitalName: 'Text'
  }
};
Object.keys(NORMAL).forEach(function (type) {
  NORMAL[type].getterName = `${type}Tracks`;
  NORMAL[type].privateName = `${type}Tracks_`;
});
const REMOTE = {
  remoteText: {
    ListClass: TextTrackList,
    TrackClass: TextTrack,
    capitalName: 'RemoteText',
    getterName: 'remoteTextTracks',
    privateName: 'remoteTextTracks_'
  },
  remoteTextEl: {
    ListClass: HtmlTrackElementList,
    TrackClass: HTMLTrackElement,
    capitalName: 'RemoteTextTrackEls',
    getterName: 'remoteTextTrackEls',
    privateName: 'remoteTextTrackEls_'
  }
};
const ALL = Object.assign({}, NORMAL, REMOTE);
REMOTE.names = Object.keys(REMOTE);
NORMAL.names = Object.keys(NORMAL);
ALL.names = [].concat(REMOTE.names).concat(NORMAL.names);

/**
 * @file tech.js
 */

/**
 * An Object containing a structure like: `{src: 'url', type: 'mimetype'}` or string
 * that just contains the src url alone.
 * * `var SourceObject = {src: 'http://ex.com/video.mp4', type: 'video/mp4'};`
   * `var SourceString = 'http://example.com/some-video.mp4';`
 *
 * @typedef {Object|string} Tech~SourceObject
 *
 * @property {string} src
 *           The url to the source
 *
 * @property {string} type
 *           The mime type of the source
 */

/**
 * A function used by {@link Tech} to create a new {@link TextTrack}.
 *
 * @private
 *
 * @param {Tech} self
 *        An instance of the Tech class.
 *
 * @param {string} kind
 *        `TextTrack` kind (subtitles, captions, descriptions, chapters, or metadata)
 *
 * @param {string} [label]
 *        Label to identify the text track
 *
 * @param {string} [language]
 *        Two letter language abbreviation
 *
 * @param {Object} [options={}]
 *        An object with additional text track options
 *
 * @return {TextTrack}
 *          The text track that was created.
 */
function createTrackHelper(self, kind, label, language, options = {}) {
  const tracks = self.textTracks();
  options.kind = kind;
  if (label) {
    options.label = label;
  }
  if (language) {
    options.language = language;
  }
  options.tech = self;
  const track = new ALL.text.TrackClass(options);
  tracks.addTrack(track);
  return track;
}

/**
 * This is the base class for media playback technology controllers, such as
 * {@link HTML5}
 *
 * @extends Component
 */
class Tech extends Component {
  /**
  * Create an instance of this Tech.
  *
  * @param {Object} [options]
  *        The key/value store of player options.
  *
  * @param {Function} [ready]
  *        Callback function to call when the `HTML5` Tech is ready.
  */
  constructor(options = {}, ready = function () {}) {
    // we don't want the tech to report user activity automatically.
    // This is done manually in addControlsListeners
    options.reportTouchActivity = false;
    super(null, options, ready);
    this.onDurationChange_ = e => this.onDurationChange(e);
    this.trackProgress_ = e => this.trackProgress(e);
    this.trackCurrentTime_ = e => this.trackCurrentTime(e);
    this.stopTrackingCurrentTime_ = e => this.stopTrackingCurrentTime(e);
    this.disposeSourceHandler_ = e => this.disposeSourceHandler(e);
    this.queuedHanders_ = new Set();

    // keep track of whether the current source has played at all to
    // implement a very limited played()
    this.hasStarted_ = false;
    this.on('playing', function () {
      this.hasStarted_ = true;
    });
    this.on('loadstart', function () {
      this.hasStarted_ = false;
    });
    ALL.names.forEach(name => {
      const props = ALL[name];
      if (options && options[props.getterName]) {
        this[props.privateName] = options[props.getterName];
      }
    });

    // Manually track progress in cases where the browser/tech doesn't report it.
    if (!this.featuresProgressEvents) {
      this.manualProgressOn();
    }

    // Manually track timeupdates in cases where the browser/tech doesn't report it.
    if (!this.featuresTimeupdateEvents) {
      this.manualTimeUpdatesOn();
    }
    ['Text', 'Audio', 'Video'].forEach(track => {
      if (options[`native${track}Tracks`] === false) {
        this[`featuresNative${track}Tracks`] = false;
      }
    });
    if (options.nativeCaptions === false || options.nativeTextTracks === false) {
      this.featuresNativeTextTracks = false;
    } else if (options.nativeCaptions === true || options.nativeTextTracks === true) {
      this.featuresNativeTextTracks = true;
    }
    if (!this.featuresNativeTextTracks) {
      this.emulateTextTracks();
    }
    this.preloadTextTracks = options.preloadTextTracks !== false;
    this.autoRemoteTextTracks_ = new ALL.text.ListClass();
    this.initTrackListeners();

    // Turn on component tap events only if not using native controls
    if (!options.nativeControlsForTouch) {
      this.emitTapEvents();
    }
    if (this.constructor) {
      this.name_ = this.constructor.name || 'Unknown Tech';
    }
  }

  /**
   * A special function to trigger source set in a way that will allow player
   * to re-trigger if the player or tech are not ready yet.
   *
   * @fires Tech#sourceset
   * @param {string} src The source string at the time of the source changing.
   */
  triggerSourceset(src) {
    if (!this.isReady_) {
      // on initial ready we have to trigger source set
      // 1ms after ready so that player can watch for it.
      this.one('ready', () => this.setTimeout(() => this.triggerSourceset(src), 1));
    }

    /**
     * Fired when the source is set on the tech causing the media element
     * to reload.
     *
     * @see {@link Player#event:sourceset}
     * @event Tech#sourceset
     * @type {Event}
     */
    this.trigger({
      src,
      type: 'sourceset'
    });
  }

  /* Fallbacks for unsupported event types
  ================================================================================ */

  /**
   * Polyfill the `progress` event for browsers that don't support it natively.
   *
   * @see {@link Tech#trackProgress}
   */
  manualProgressOn() {
    this.on('durationchange', this.onDurationChange_);
    this.manualProgress = true;

    // Trigger progress watching when a source begins loading
    this.one('ready', this.trackProgress_);
  }

  /**
   * Turn off the polyfill for `progress` events that was created in
   * {@link Tech#manualProgressOn}
   */
  manualProgressOff() {
    this.manualProgress = false;
    this.stopTrackingProgress();
    this.off('durationchange', this.onDurationChange_);
  }

  /**
   * This is used to trigger a `progress` event when the buffered percent changes. It
   * sets an interval function that will be called every 500 milliseconds to check if the
   * buffer end percent has changed.
   *
   * > This function is called by {@link Tech#manualProgressOn}
   *
   * @param {Event} event
   *        The `ready` event that caused this to run.
   *
   * @listens Tech#ready
   * @fires Tech#progress
   */
  trackProgress(event) {
    this.stopTrackingProgress();
    this.progressInterval = this.setInterval(bind_(this, function () {
      // Don't trigger unless buffered amount is greater than last time

      const numBufferedPercent = this.bufferedPercent();
      if (this.bufferedPercent_ !== numBufferedPercent) {
        /**
         * See {@link Player#progress}
         *
         * @event Tech#progress
         * @type {Event}
         */
        this.trigger('progress');
      }
      this.bufferedPercent_ = numBufferedPercent;
      if (numBufferedPercent === 1) {
        this.stopTrackingProgress();
      }
    }), 500);
  }

  /**
   * Update our internal duration on a `durationchange` event by calling
   * {@link Tech#duration}.
   *
   * @param {Event} event
   *        The `durationchange` event that caused this to run.
   *
   * @listens Tech#durationchange
   */
  onDurationChange(event) {
    this.duration_ = this.duration();
  }

  /**
   * Get and create a `TimeRange` object for buffering.
   *
   * @return { import('../utils/time').TimeRange }
   *         The time range object that was created.
   */
  buffered() {
    return createTimeRanges(0, 0);
  }

  /**
   * Get the percentage of the current video that is currently buffered.
   *
   * @return {number}
   *         A number from 0 to 1 that represents the decimal percentage of the
   *         video that is buffered.
   *
   */
  bufferedPercent() {
    return bufferedPercent(this.buffered(), this.duration_);
  }

  /**
   * Turn off the polyfill for `progress` events that was created in
   * {@link Tech#manualProgressOn}
   * Stop manually tracking progress events by clearing the interval that was set in
   * {@link Tech#trackProgress}.
   */
  stopTrackingProgress() {
    this.clearInterval(this.progressInterval);
  }

  /**
   * Polyfill the `timeupdate` event for browsers that don't support it.
   *
   * @see {@link Tech#trackCurrentTime}
   */
  manualTimeUpdatesOn() {
    this.manualTimeUpdates = true;
    this.on('play', this.trackCurrentTime_);
    this.on('pause', this.stopTrackingCurrentTime_);
  }

  /**
   * Turn off the polyfill for `timeupdate` events that was created in
   * {@link Tech#manualTimeUpdatesOn}
   */
  manualTimeUpdatesOff() {
    this.manualTimeUpdates = false;
    this.stopTrackingCurrentTime();
    this.off('play', this.trackCurrentTime_);
    this.off('pause', this.stopTrackingCurrentTime_);
  }

  /**
   * Sets up an interval function to track current time and trigger `timeupdate` every
   * 250 milliseconds.
   *
   * @listens Tech#play
   * @triggers Tech#timeupdate
   */
  trackCurrentTime() {
    if (this.currentTimeInterval) {
      this.stopTrackingCurrentTime();
    }
    this.currentTimeInterval = this.setInterval(function () {
      /**
       * Triggered at an interval of 250ms to indicated that time is passing in the video.
       *
       * @event Tech#timeupdate
       * @type {Event}
       */
      this.trigger({
        type: 'timeupdate',
        target: this,
        manuallyTriggered: true
      });

      // 42 = 24 fps // 250 is what Webkit uses // FF uses 15
    }, 250);
  }

  /**
   * Stop the interval function created in {@link Tech#trackCurrentTime} so that the
   * `timeupdate` event is no longer triggered.
   *
   * @listens {Tech#pause}
   */
  stopTrackingCurrentTime() {
    this.clearInterval(this.currentTimeInterval);

    // #1002 - if the video ends right before the next timeupdate would happen,
    // the progress bar won't make it all the way to the end
    this.trigger({
      type: 'timeupdate',
      target: this,
      manuallyTriggered: true
    });
  }

  /**
   * Turn off all event polyfills, clear the `Tech`s {@link AudioTrackList},
   * {@link VideoTrackList}, and {@link TextTrackList}, and dispose of this Tech.
   *
   * @fires Component#dispose
   */
  dispose() {
    // clear out all tracks because we can't reuse them between techs
    this.clearTracks(NORMAL.names);

    // Turn off any manual progress or timeupdate tracking
    if (this.manualProgress) {
      this.manualProgressOff();
    }
    if (this.manualTimeUpdates) {
      this.manualTimeUpdatesOff();
    }
    super.dispose();
  }

  /**
   * Clear out a single `TrackList` or an array of `TrackLists` given their names.
   *
   * > Note: Techs without source handlers should call this between sources for `video`
   *         & `audio` tracks. You don't want to use them between tracks!
   *
   * @param {string[]|string} types
   *        TrackList names to clear, valid names are `video`, `audio`, and
   *        `text`.
   */
  clearTracks(types) {
    types = [].concat(types);
    // clear out all tracks because we can't reuse them between techs
    types.forEach(type => {
      const list = this[`${type}Tracks`]() || [];
      let i = list.length;
      while (i--) {
        const track = list[i];
        if (type === 'text') {
          this.removeRemoteTextTrack(track);
        }
        list.removeTrack(track);
      }
    });
  }

  /**
   * Remove any TextTracks added via addRemoteTextTrack that are
   * flagged for automatic garbage collection
   */
  cleanupAutoTextTracks() {
    const list = this.autoRemoteTextTracks_ || [];
    let i = list.length;
    while (i--) {
      const track = list[i];
      this.removeRemoteTextTrack(track);
    }
  }

  /**
   * Reset the tech, which will removes all sources and reset the internal readyState.
   *
   * @abstract
   */
  reset() {}

  /**
   * Get the value of `crossOrigin` from the tech.
   *
   * @abstract
   *
   * @see {Html5#crossOrigin}
   */
  crossOrigin() {}

  /**
   * Set the value of `crossOrigin` on the tech.
   *
   * @abstract
   *
   * @param {string} crossOrigin the crossOrigin value
   * @see {Html5#setCrossOrigin}
   */
  setCrossOrigin() {}

  /**
   * Get or set an error on the Tech.
   *
   * @param {MediaError} [err]
   *        Error to set on the Tech
   *
   * @return {MediaError|null}
   *         The current error object on the tech, or null if there isn't one.
   */
  error(err) {
    if (err !== undefined) {
      this.error_ = new MediaError(err);
      this.trigger('error');
    }
    return this.error_;
  }

  /**
   * Returns the `TimeRange`s that have been played through for the current source.
   *
   * > NOTE: This implementation is incomplete. It does not track the played `TimeRange`.
   *         It only checks whether the source has played at all or not.
   *
   * @return {TimeRange}
   *         - A single time range if this video has played
   *         - An empty set of ranges if not.
   */
  played() {
    if (this.hasStarted_) {
      return createTimeRanges(0, 0);
    }
    return createTimeRanges();
  }

  /**
   * Start playback
   *
   * @abstract
   *
   * @see {Html5#play}
   */
  play() {}

  /**
   * Set whether we are scrubbing or not
   *
   * @abstract
   * @param {boolean} _isScrubbing
   *                  - true for we are currently scrubbing
   *                  - false for we are no longer scrubbing
   *
   * @see {Html5#setScrubbing}
   */
  setScrubbing(_isScrubbing) {}

  /**
   * Get whether we are scrubbing or not
   *
   * @abstract
   *
   * @see {Html5#scrubbing}
   */
  scrubbing() {}

  /**
   * Causes a manual time update to occur if {@link Tech#manualTimeUpdatesOn} was
   * previously called.
   *
   * @param {number} _seconds
   *        Set the current time of the media to this.
   * @fires Tech#timeupdate
   */
  setCurrentTime(_seconds) {
    // improve the accuracy of manual timeupdates
    if (this.manualTimeUpdates) {
      /**
       * A manual `timeupdate` event.
       *
       * @event Tech#timeupdate
       * @type {Event}
       */
      this.trigger({
        type: 'timeupdate',
        target: this,
        manuallyTriggered: true
      });
    }
  }

  /**
   * Turn on listeners for {@link VideoTrackList}, {@link {AudioTrackList}, and
   * {@link TextTrackList} events.
   *
   * This adds {@link EventTarget~EventListeners} for `addtrack`, and  `removetrack`.
   *
   * @fires Tech#audiotrackchange
   * @fires Tech#videotrackchange
   * @fires Tech#texttrackchange
   */
  initTrackListeners() {
    /**
      * Triggered when tracks are added or removed on the Tech {@link AudioTrackList}
      *
      * @event Tech#audiotrackchange
      * @type {Event}
      */

    /**
      * Triggered when tracks are added or removed on the Tech {@link VideoTrackList}
      *
      * @event Tech#videotrackchange
      * @type {Event}
      */

    /**
      * Triggered when tracks are added or removed on the Tech {@link TextTrackList}
      *
      * @event Tech#texttrackchange
      * @type {Event}
      */
    NORMAL.names.forEach(name => {
      const props = NORMAL[name];
      const trackListChanges = () => {
        this.trigger(`${name}trackchange`);
      };
      const tracks = this[props.getterName]();
      tracks.addEventListener('removetrack', trackListChanges);
      tracks.addEventListener('addtrack', trackListChanges);
      this.on('dispose', () => {
        tracks.removeEventListener('removetrack', trackListChanges);
        tracks.removeEventListener('addtrack', trackListChanges);
      });
    });
  }

  /**
   * Emulate TextTracks using vtt.js if necessary
   *
   * @fires Tech#vttjsloaded
   * @fires Tech#vttjserror
   */
  addWebVttScript_() {
    if (window.WebVTT) {
      return;
    }

    // Initially, Tech.el_ is a child of a dummy-div wait until the Component system
    // signals that the Tech is ready at which point Tech.el_ is part of the DOM
    // before inserting the WebVTT script
    if (document.body.contains(this.el())) {
      // load via require if available and vtt.js script location was not passed in
      // as an option. novtt builds will turn the above require call into an empty object
      // which will cause this if check to always fail.
      if (!this.options_['vtt.js'] && isPlain(vtt) && Object.keys(vtt).length > 0) {
        this.trigger('vttjsloaded');
        return;
      }

      // load vtt.js via the script location option or the cdn of no location was
      // passed in
      const script = document.createElement('script');
      script.src = this.options_['vtt.js'] || 'https://vjs.zencdn.net/vttjs/0.14.1/vtt.min.js';
      script.onload = () => {
        /**
         * Fired when vtt.js is loaded.
         *
         * @event Tech#vttjsloaded
         * @type {Event}
         */
        this.trigger('vttjsloaded');
      };
      script.onerror = () => {
        /**
         * Fired when vtt.js was not loaded due to an error
         *
         * @event Tech#vttjsloaded
         * @type {Event}
         */
        this.trigger('vttjserror');
      };
      this.on('dispose', () => {
        script.onload = null;
        script.onerror = null;
      });
      // but have not loaded yet and we set it to true before the inject so that
      // we don't overwrite the injected window.WebVTT if it loads right away
      window.WebVTT = true;
      this.el().parentNode.appendChild(script);
    } else {
      this.ready(this.addWebVttScript_);
    }
  }

  /**
   * Emulate texttracks
   *
   */
  emulateTextTracks() {
    const tracks = this.textTracks();
    const remoteTracks = this.remoteTextTracks();
    const handleAddTrack = e => tracks.addTrack(e.track);
    const handleRemoveTrack = e => tracks.removeTrack(e.track);
    remoteTracks.on('addtrack', handleAddTrack);
    remoteTracks.on('removetrack', handleRemoveTrack);
    this.addWebVttScript_();
    const updateDisplay = () => this.trigger('texttrackchange');
    const textTracksChanges = () => {
      updateDisplay();
      for (let i = 0; i < tracks.length; i++) {
        const track = tracks[i];
        track.removeEventListener('cuechange', updateDisplay);
        if (track.mode === 'showing') {
          track.addEventListener('cuechange', updateDisplay);
        }
      }
    };
    textTracksChanges();
    tracks.addEventListener('change', textTracksChanges);
    tracks.addEventListener('addtrack', textTracksChanges);
    tracks.addEventListener('removetrack', textTracksChanges);
    this.on('dispose', function () {
      remoteTracks.off('addtrack', handleAddTrack);
      remoteTracks.off('removetrack', handleRemoveTrack);
      tracks.removeEventListener('change', textTracksChanges);
      tracks.removeEventListener('addtrack', textTracksChanges);
      tracks.removeEventListener('removetrack', textTracksChanges);
      for (let i = 0; i < tracks.length; i++) {
        const track = tracks[i];
        track.removeEventListener('cuechange', updateDisplay);
      }
    });
  }

  /**
   * Create and returns a remote {@link TextTrack} object.
   *
   * @param {string} kind
   *        `TextTrack` kind (subtitles, captions, descriptions, chapters, or metadata)
   *
   * @param {string} [label]
   *        Label to identify the text track
   *
   * @param {string} [language]
   *        Two letter language abbreviation
   *
   * @return {TextTrack}
   *         The TextTrack that gets created.
   */
  addTextTrack(kind, label, language) {
    if (!kind) {
      throw new Error('TextTrack kind is required but was not provided');
    }
    return createTrackHelper(this, kind, label, language);
  }

  /**
   * Create an emulated TextTrack for use by addRemoteTextTrack
   *
   * This is intended to be overridden by classes that inherit from
   * Tech in order to create native or custom TextTracks.
   *
   * @param {Object} options
   *        The object should contain the options to initialize the TextTrack with.
   *
   * @param {string} [options.kind]
   *        `TextTrack` kind (subtitles, captions, descriptions, chapters, or metadata).
   *
   * @param {string} [options.label].
   *        Label to identify the text track
   *
   * @param {string} [options.language]
   *        Two letter language abbreviation.
   *
   * @return {HTMLTrackElement}
   *         The track element that gets created.
   */
  createRemoteTextTrack(options) {
    const track = merge(options, {
      tech: this
    });
    return new REMOTE.remoteTextEl.TrackClass(track);
  }

  /**
   * Creates a remote text track object and returns an html track element.
   *
   * > Note: This can be an emulated {@link HTMLTrackElement} or a native one.
   *
   * @param {Object} options
   *        See {@link Tech#createRemoteTextTrack} for more detailed properties.
   *
   * @param {boolean} [manualCleanup=false]
   *        - When false: the TextTrack will be automatically removed from the video
   *          element whenever the source changes
   *        - When True: The TextTrack will have to be cleaned up manually
   *
   * @return {HTMLTrackElement}
   *         An Html Track Element.
   *
   */
  addRemoteTextTrack(options = {}, manualCleanup) {
    const htmlTrackElement = this.createRemoteTextTrack(options);
    if (typeof manualCleanup !== 'boolean') {
      manualCleanup = false;
    }

    // store HTMLTrackElement and TextTrack to remote list
    this.remoteTextTrackEls().addTrackElement_(htmlTrackElement);
    this.remoteTextTracks().addTrack(htmlTrackElement.track);
    if (manualCleanup === false) {
      // create the TextTrackList if it doesn't exist
      this.ready(() => this.autoRemoteTextTracks_.addTrack(htmlTrackElement.track));
    }
    return htmlTrackElement;
  }

  /**
   * Remove a remote text track from the remote `TextTrackList`.
   *
   * @param {TextTrack} track
   *        `TextTrack` to remove from the `TextTrackList`
   */
  removeRemoteTextTrack(track) {
    const trackElement = this.remoteTextTrackEls().getTrackElementByTrack_(track);

    // remove HTMLTrackElement and TextTrack from remote list
    this.remoteTextTrackEls().removeTrackElement_(trackElement);
    this.remoteTextTracks().removeTrack(track);
    this.autoRemoteTextTracks_.removeTrack(track);
  }

  /**
   * Gets available media playback quality metrics as specified by the W3C's Media
   * Playback Quality API.
   *
   * @see [Spec]{@link https://wicg.github.io/media-playback-quality}
   *
   * @return {Object}
   *         An object with supported media playback quality metrics
   *
   * @abstract
   */
  getVideoPlaybackQuality() {
    return {};
  }

  /**
   * Attempt to create a floating video window always on top of other windows
   * so that users may continue consuming media while they interact with other
   * content sites, or applications on their device.
   *
   * @see [Spec]{@link https://wicg.github.io/picture-in-picture}
   *
   * @return {Promise|undefined}
   *         A promise with a Picture-in-Picture window if the browser supports
   *         Promises (or one was passed in as an option). It returns undefined
   *         otherwise.
   *
   * @abstract
   */
  requestPictureInPicture() {
    return Promise.reject();
  }

  /**
   * A method to check for the value of the 'disablePictureInPicture' <video> property.
   * Defaults to true, as it should be considered disabled if the tech does not support pip
   *
   * @abstract
   */
  disablePictureInPicture() {
    return true;
  }

  /**
   * A method to set or unset the 'disablePictureInPicture' <video> property.
   *
   * @abstract
   */
  setDisablePictureInPicture() {}

  /**
   * A fallback implementation of requestVideoFrameCallback using requestAnimationFrame
   *
   * @param {function} cb
   * @return {number} request id
   */
  requestVideoFrameCallback(cb) {
    const id = newGUID();
    if (!this.isReady_ || this.paused()) {
      this.queuedHanders_.add(id);
      this.one('playing', () => {
        if (this.queuedHanders_.has(id)) {
          this.queuedHanders_.delete(id);
          cb();
        }
      });
    } else {
      this.requestNamedAnimationFrame(id, cb);
    }
    return id;
  }

  /**
   * A fallback implementation of cancelVideoFrameCallback
   *
   * @param {number} id id of callback to be cancelled
   */
  cancelVideoFrameCallback(id) {
    if (this.queuedHanders_.has(id)) {
      this.queuedHanders_.delete(id);
    } else {
      this.cancelNamedAnimationFrame(id);
    }
  }

  /**
   * A method to set a poster from a `Tech`.
   *
   * @abstract
   */
  setPoster() {}

  /**
   * A method to check for the presence of the 'playsinline' <video> attribute.
   *
   * @abstract
   */
  playsinline() {}

  /**
   * A method to set or unset the 'playsinline' <video> attribute.
   *
   * @abstract
   */
  setPlaysinline() {}

  /**
   * Attempt to force override of native audio tracks.
   *
   * @param {boolean} override - If set to true native audio will be overridden,
   * otherwise native audio will potentially be used.
   *
   * @abstract
   */
  overrideNativeAudioTracks(override) {}

  /**
   * Attempt to force override of native video tracks.
   *
   * @param {boolean} override - If set to true native video will be overridden,
   * otherwise native video will potentially be used.
   *
   * @abstract
   */
  overrideNativeVideoTracks(override) {}

  /**
   * Check if the tech can support the given mime-type.
   *
   * The base tech does not support any type, but source handlers might
   * overwrite this.
   *
   * @param  {string} _type
   *         The mimetype to check for support
   *
   * @return {string}
   *         'probably', 'maybe', or empty string
   *
   * @see [Spec]{@link https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/canPlayType}
   *
   * @abstract
   */
  canPlayType(_type) {
    return '';
  }

  /**
   * Check if the type is supported by this tech.
   *
   * The base tech does not support any type, but source handlers might
   * overwrite this.
   *
   * @param {string} _type
   *        The media type to check
   * @return {string} Returns the native video element's response
   */
  static canPlayType(_type) {
    return '';
  }

  /**
   * Check if the tech can support the given source
   *
   * @param {Object} srcObj
   *        The source object
   * @param {Object} options
   *        The options passed to the tech
   * @return {string} 'probably', 'maybe', or '' (empty string)
   */
  static canPlaySource(srcObj, options) {
    return Tech.canPlayType(srcObj.type);
  }

  /*
   * Return whether the argument is a Tech or not.
   * Can be passed either a Class like `Html5` or a instance like `player.tech_`
   *
   * @param {Object} component
   *        The item to check
   *
   * @return {boolean}
   *         Whether it is a tech or not
   *         - True if it is a tech
   *         - False if it is not
   */
  static isTech(component) {
    return component.prototype instanceof Tech || component instanceof Tech || component === Tech;
  }

  /**
   * Registers a `Tech` into a shared list for videojs.
   *
   * @param {string} name
   *        Name of the `Tech` to register.
   *
   * @param {Object} tech
   *        The `Tech` class to register.
   */
  static registerTech(name, tech) {
    if (!Tech.techs_) {
      Tech.techs_ = {};
    }
    if (!Tech.isTech(tech)) {
      throw new Error(`Tech ${name} must be a Tech`);
    }
    if (!Tech.canPlayType) {
      throw new Error('Techs must have a static canPlayType method on them');
    }
    if (!Tech.canPlaySource) {
      throw new Error('Techs must have a static canPlaySource method on them');
    }
    name = toTitleCase(name);
    Tech.techs_[name] = tech;
    Tech.techs_[toLowerCase(name)] = tech;
    if (name !== 'Tech') {
      // camel case the techName for use in techOrder
      Tech.defaultTechOrder_.push(name);
    }
    return tech;
  }

  /**
   * Get a `Tech` from the shared list by name.
   *
   * @param {string} name
   *        `camelCase` or `TitleCase` name of the Tech to get
   *
   * @return {Tech|undefined}
   *         The `Tech` or undefined if there was no tech with the name requested.
   */
  static getTech(name) {
    if (!name) {
      return;
    }
    if (Tech.techs_ && Tech.techs_[name]) {
      return Tech.techs_[name];
    }
    name = toTitleCase(name);
    if (window && window.videojs && window.videojs[name]) {
      log.warn(`The ${name} tech was added to the videojs object when it should be registered using videojs.registerTech(name, tech)`);
      return window.videojs[name];
    }
  }
}

/**
 * Get the {@link VideoTrackList}
 *
 * @returns {VideoTrackList}
 * @method Tech.prototype.videoTracks
 */

/**
 * Get the {@link AudioTrackList}
 *
 * @returns {AudioTrackList}
 * @method Tech.prototype.audioTracks
 */

/**
 * Get the {@link TextTrackList}
 *
 * @returns {TextTrackList}
 * @method Tech.prototype.textTracks
 */

/**
 * Get the remote element {@link TextTrackList}
 *
 * @returns {TextTrackList}
 * @method Tech.prototype.remoteTextTracks
 */

/**
 * Get the remote element {@link HtmlTrackElementList}
 *
 * @returns {HtmlTrackElementList}
 * @method Tech.prototype.remoteTextTrackEls
 */

ALL.names.forEach(function (name) {
  const props = ALL[name];
  Tech.prototype[props.getterName] = function () {
    this[props.privateName] = this[props.privateName] || new props.ListClass();
    return this[props.privateName];
  };
});

/**
 * List of associated text tracks
 *
 * @type {TextTrackList}
 * @private
 * @property Tech#textTracks_
 */

/**
 * List of associated audio tracks.
 *
 * @type {AudioTrackList}
 * @private
 * @property Tech#audioTracks_
 */

/**
 * List of associated video tracks.
 *
 * @type {VideoTrackList}
 * @private
 * @property Tech#videoTracks_
 */

/**
 * Boolean indicating whether the `Tech` supports volume control.
 *
 * @type {boolean}
 * @default
 */
Tech.prototype.featuresVolumeControl = true;

/**
 * Boolean indicating whether the `Tech` supports muting volume.
 *
 * @type {boolean}
 * @default
 */
Tech.prototype.featuresMuteControl = true;

/**
 * Boolean indicating whether the `Tech` supports fullscreen resize control.
 * Resizing plugins using request fullscreen reloads the plugin
 *
 * @type {boolean}
 * @default
 */
Tech.prototype.featuresFullscreenResize = false;

/**
 * Boolean indicating whether the `Tech` supports changing the speed at which the video
 * plays. Examples:
 *   - Set player to play 2x (twice) as fast
 *   - Set player to play 0.5x (half) as fast
 *
 * @type {boolean}
 * @default
 */
Tech.prototype.featuresPlaybackRate = false;

/**
 * Boolean indicating whether the `Tech` supports the `progress` event.
 * This will be used to determine if {@link Tech#manualProgressOn} should be called.
 *
 * @type {boolean}
 * @default
 */
Tech.prototype.featuresProgressEvents = false;

/**
 * Boolean indicating whether the `Tech` supports the `sourceset` event.
 *
 * A tech should set this to `true` and then use {@link Tech#triggerSourceset}
 * to trigger a {@link Tech#event:sourceset} at the earliest time after getting
 * a new source.
 *
 * @type {boolean}
 * @default
 */
Tech.prototype.featuresSourceset = false;

/**
 * Boolean indicating whether the `Tech` supports the `timeupdate` event.
 * This will be used to determine if {@link Tech#manualTimeUpdates} should be called.
 *
 * @type {boolean}
 * @default
 */
Tech.prototype.featuresTimeupdateEvents = false;

/**
 * Boolean indicating whether the `Tech` supports the native `TextTrack`s.
 * This will help us integrate with native `TextTrack`s if the browser supports them.
 *
 * @type {boolean}
 * @default
 */
Tech.prototype.featuresNativeTextTracks = false;

/**
 * Boolean indicating whether the `Tech` supports `requestVideoFrameCallback`.
 *
 * @type {boolean}
 * @default
 */
Tech.prototype.featuresVideoFrameCallback = false;

/**
 * A functional mixin for techs that want to use the Source Handler pattern.
 * Source handlers are scripts for handling specific formats.
 * The source handler pattern is used for adaptive formats (HLS, DASH) that
 * manually load video data and feed it into a Source Buffer (Media Source Extensions)
 * Example: `Tech.withSourceHandlers.call(MyTech);`
 *
 * @param {Tech} _Tech
 *        The tech to add source handler functions to.
 *
 * @mixes Tech~SourceHandlerAdditions
 */
Tech.withSourceHandlers = function (_Tech) {
  /**
   * Register a source handler
   *
   * @param {Function} handler
   *        The source handler class
   *
   * @param {number} [index]
   *        Register it at the following index
   */
  _Tech.registerSourceHandler = function (handler, index) {
    let handlers = _Tech.sourceHandlers;
    if (!handlers) {
      handlers = _Tech.sourceHandlers = [];
    }
    if (index === undefined) {
      // add to the end of the list
      index = handlers.length;
    }
    handlers.splice(index, 0, handler);
  };

  /**
   * Check if the tech can support the given type. Also checks the
   * Techs sourceHandlers.
   *
   * @param {string} type
   *         The mimetype to check.
   *
   * @return {string}
   *         'probably', 'maybe', or '' (empty string)
   */
  _Tech.canPlayType = function (type) {
    const handlers = _Tech.sourceHandlers || [];
    let can;
    for (let i = 0; i < handlers.length; i++) {
      can = handlers[i].canPlayType(type);
      if (can) {
        return can;
      }
    }
    return '';
  };

  /**
   * Returns the first source handler that supports the source.
   *
   * TODO: Answer question: should 'probably' be prioritized over 'maybe'
   *
   * @param {Tech~SourceObject} source
   *        The source object
   *
   * @param {Object} options
   *        The options passed to the tech
   *
   * @return {SourceHandler|null}
   *          The first source handler that supports the source or null if
   *          no SourceHandler supports the source
   */
  _Tech.selectSourceHandler = function (source, options) {
    const handlers = _Tech.sourceHandlers || [];
    let can;
    for (let i = 0; i < handlers.length; i++) {
      can = handlers[i].canHandleSource(source, options);
      if (can) {
        return handlers[i];
      }
    }
    return null;
  };

  /**
   * Check if the tech can support the given source.
   *
   * @param {Tech~SourceObject} srcObj
   *        The source object
   *
   * @param {Object} options
   *        The options passed to the tech
   *
   * @return {string}
   *         'probably', 'maybe', or '' (empty string)
   */
  _Tech.canPlaySource = function (srcObj, options) {
    const sh = _Tech.selectSourceHandler(srcObj, options);
    if (sh) {
      return sh.canHandleSource(srcObj, options);
    }
    return '';
  };

  /**
   * When using a source handler, prefer its implementation of
   * any function normally provided by the tech.
   */
  const deferrable = ['seekable', 'seeking', 'duration'];

  /**
   * A wrapper around {@link Tech#seekable} that will call a `SourceHandler`s seekable
   * function if it exists, with a fallback to the Techs seekable function.
   *
   * @method _Tech.seekable
   */

  /**
   * A wrapper around {@link Tech#duration} that will call a `SourceHandler`s duration
   * function if it exists, otherwise it will fallback to the techs duration function.
   *
   * @method _Tech.duration
   */

  deferrable.forEach(function (fnName) {
    const originalFn = this[fnName];
    if (typeof originalFn !== 'function') {
      return;
    }
    this[fnName] = function () {
      if (this.sourceHandler_ && this.sourceHandler_[fnName]) {
        return this.sourceHandler_[fnName].apply(this.sourceHandler_, arguments);
      }
      return originalFn.apply(this, arguments);
    };
  }, _Tech.prototype);

  /**
   * Create a function for setting the source using a source object
   * and source handlers.
   * Should never be called unless a source handler was found.
   *
   * @param {Tech~SourceObject} source
   *        A source object with src and type keys
   */
  _Tech.prototype.setSource = function (source) {
    let sh = _Tech.selectSourceHandler(source, this.options_);
    if (!sh) {
      // Fall back to a native source handler when unsupported sources are
      // deliberately set
      if (_Tech.nativeSourceHandler) {
        sh = _Tech.nativeSourceHandler;
      } else {
        log.error('No source handler found for the current source.');
      }
    }

    // Dispose any existing source handler
    this.disposeSourceHandler();
    this.off('dispose', this.disposeSourceHandler_);
    if (sh !== _Tech.nativeSourceHandler) {
      this.currentSource_ = source;
    }
    this.sourceHandler_ = sh.handleSource(source, this, this.options_);
    this.one('dispose', this.disposeSourceHandler_);
  };

  /**
   * Clean up any existing SourceHandlers and listeners when the Tech is disposed.
   *
   * @listens Tech#dispose
   */
  _Tech.prototype.disposeSourceHandler = function () {
    // if we have a source and get another one
    // then we are loading something new
    // than clear all of our current tracks
    if (this.currentSource_) {
      this.clearTracks(['audio', 'video']);
      this.currentSource_ = null;
    }

    // always clean up auto-text tracks
    this.cleanupAutoTextTracks();
    if (this.sourceHandler_) {
      if (this.sourceHandler_.dispose) {
        this.sourceHandler_.dispose();
      }
      this.sourceHandler_ = null;
    }
  };
};

// The base Tech class needs to be registered as a Component. It is the only
// Tech that can be registered as a Component.
Component.registerComponent('Tech', Tech);
Tech.registerTech('Tech', Tech);

/**
 * A list of techs that should be added to techOrder on Players
 *
 * @private
 */
Tech.defaultTechOrder_ = [];

/**
 * @file middleware.js
 * @module middleware
 */
const middlewares = {};
const middlewareInstances = {};
const TERMINATOR = {};

/**
 * A middleware object is a plain JavaScript object that has methods that
 * match the {@link Tech} methods found in the lists of allowed
 * {@link module:middleware.allowedGetters|getters},
 * {@link module:middleware.allowedSetters|setters}, and
 * {@link module:middleware.allowedMediators|mediators}.
 *
 * @typedef {Object} MiddlewareObject
 */

/**
 * A middleware factory function that should return a
 * {@link module:middleware~MiddlewareObject|MiddlewareObject}.
 *
 * This factory will be called for each player when needed, with the player
 * passed in as an argument.
 *
 * @callback MiddlewareFactory
 * @param { import('../player').default } player
 *        A Video.js player.
 */

/**
 * Define a middleware that the player should use by way of a factory function
 * that returns a middleware object.
 *
 * @param  {string} type
 *         The MIME type to match or `"*"` for all MIME types.
 *
 * @param  {MiddlewareFactory} middleware
 *         A middleware factory function that will be executed for
 *         matching types.
 */
function use(type, middleware) {
  middlewares[type] = middlewares[type] || [];
  middlewares[type].push(middleware);
}

/**
 * Asynchronously sets a source using middleware by recursing through any
 * matching middlewares and calling `setSource` on each, passing along the
 * previous returned value each time.
 *
 * @param  { import('../player').default } player
 *         A {@link Player} instance.
 *
 * @param  {Tech~SourceObject} src
 *         A source object.
 *
 * @param  {Function}
 *         The next middleware to run.
 */
function setSource(player, src, next) {
  player.setTimeout(() => setSourceHelper(src, middlewares[src.type], next, player), 1);
}

/**
 * When the tech is set, passes the tech to each middleware's `setTech` method.
 *
 * @param {Object[]} middleware
 *        An array of middleware instances.
 *
 * @param { import('../tech/tech').default } tech
 *        A Video.js tech.
 */
function setTech(middleware, tech) {
  middleware.forEach(mw => mw.setTech && mw.setTech(tech));
}

/**
 * Calls a getter on the tech first, through each middleware
 * from right to left to the player.
 *
 * @param  {Object[]} middleware
 *         An array of middleware instances.
 *
 * @param  { import('../tech/tech').default } tech
 *         The current tech.
 *
 * @param  {string} method
 *         A method name.
 *
 * @return {*}
 *         The final value from the tech after middleware has intercepted it.
 */
function get(middleware, tech, method) {
  return middleware.reduceRight(middlewareIterator(method), tech[method]());
}

/**
 * Takes the argument given to the player and calls the setter method on each
 * middleware from left to right to the tech.
 *
 * @param  {Object[]} middleware
 *         An array of middleware instances.
 *
 * @param  { import('../tech/tech').default } tech
 *         The current tech.
 *
 * @param  {string} method
 *         A method name.
 *
 * @param  {*} arg
 *         The value to set on the tech.
 *
 * @return {*}
 *         The return value of the `method` of the `tech`.
 */
function set(middleware, tech, method, arg) {
  return tech[method](middleware.reduce(middlewareIterator(method), arg));
}

/**
 * Takes the argument given to the player and calls the `call` version of the
 * method on each middleware from left to right.
 *
 * Then, call the passed in method on the tech and return the result unchanged
 * back to the player, through middleware, this time from right to left.
 *
 * @param  {Object[]} middleware
 *         An array of middleware instances.
 *
 * @param  { import('../tech/tech').default } tech
 *         The current tech.
 *
 * @param  {string} method
 *         A method name.
 *
 * @param  {*} arg
 *         The value to set on the tech.
 *
 * @return {*}
 *         The return value of the `method` of the `tech`, regardless of the
 *         return values of middlewares.
 */
function mediate(middleware, tech, method, arg = null) {
  const callMethod = 'call' + toTitleCase(method);
  const middlewareValue = middleware.reduce(middlewareIterator(callMethod), arg);
  const terminated = middlewareValue === TERMINATOR;
  // deprecated. The `null` return value should instead return TERMINATOR to
  // prevent confusion if a techs method actually returns null.
  const returnValue = terminated ? null : tech[method](middlewareValue);
  executeRight(middleware, method, returnValue, terminated);
  return returnValue;
}

/**
 * Enumeration of allowed getters where the keys are method names.
 *
 * @type {Object}
 */
const allowedGetters = {
  buffered: 1,
  currentTime: 1,
  duration: 1,
  muted: 1,
  played: 1,
  paused: 1,
  seekable: 1,
  volume: 1,
  ended: 1
};

/**
 * Enumeration of allowed setters where the keys are method names.
 *
 * @type {Object}
 */
const allowedSetters = {
  setCurrentTime: 1,
  setMuted: 1,
  setVolume: 1
};

/**
 * Enumeration of allowed mediators where the keys are method names.
 *
 * @type {Object}
 */
const allowedMediators = {
  play: 1,
  pause: 1
};
function middlewareIterator(method) {
  return (value, mw) => {
    // if the previous middleware terminated, pass along the termination
    if (value === TERMINATOR) {
      return TERMINATOR;
    }
    if (mw[method]) {
      return mw[method](value);
    }
    return value;
  };
}
function executeRight(mws, method, value, terminated) {
  for (let i = mws.length - 1; i >= 0; i--) {
    const mw = mws[i];
    if (mw[method]) {
      mw[method](terminated, value);
    }
  }
}

/**
 * Clear the middleware cache for a player.
 *
 * @param  { import('../player').default } player
 *         A {@link Player} instance.
 */
function clearCacheForPlayer(player) {
  middlewareInstances[player.id()] = null;
}

/**
 * {
 *  [playerId]: [[mwFactory, mwInstance], ...]
 * }
 *
 * @private
 */
function getOrCreateFactory(player, mwFactory) {
  const mws = middlewareInstances[player.id()];
  let mw = null;
  if (mws === undefined || mws === null) {
    mw = mwFactory(player);
    middlewareInstances[player.id()] = [[mwFactory, mw]];
    return mw;
  }
  for (let i = 0; i < mws.length; i++) {
    const [mwf, mwi] = mws[i];
    if (mwf !== mwFactory) {
      continue;
    }
    mw = mwi;
  }
  if (mw === null) {
    mw = mwFactory(player);
    mws.push([mwFactory, mw]);
  }
  return mw;
}
function setSourceHelper(src = {}, middleware = [], next, player, acc = [], lastRun = false) {
  const [mwFactory, ...mwrest] = middleware;

  // if mwFactory is a string, then we're at a fork in the road
  if (typeof mwFactory === 'string') {
    setSourceHelper(src, middlewares[mwFactory], next, player, acc, lastRun);

    // if we have an mwFactory, call it with the player to get the mw,
    // then call the mw's setSource method
  } else if (mwFactory) {
    const mw = getOrCreateFactory(player, mwFactory);

    // if setSource isn't present, implicitly select this middleware
    if (!mw.setSource) {
      acc.push(mw);
      return setSourceHelper(src, mwrest, next, player, acc, lastRun);
    }
    mw.setSource(Object.assign({}, src), function (err, _src) {
      // something happened, try the next middleware on the current level
      // make sure to use the old src
      if (err) {
        return setSourceHelper(src, mwrest, next, player, acc, lastRun);
      }

      // we've succeeded, now we need to go deeper
      acc.push(mw);

      // if it's the same type, continue down the current chain
      // otherwise, we want to go down the new chain
      setSourceHelper(_src, src.type === _src.type ? mwrest : middlewares[_src.type], next, player, acc, lastRun);
    });
  } else if (mwrest.length) {
    setSourceHelper(src, mwrest, next, player, acc, lastRun);
  } else if (lastRun) {
    next(src, acc);
  } else {
    setSourceHelper(src, middlewares['*'], next, player, acc, true);
  }
}

/**
 * Mimetypes
 *
 * @see https://www.iana.org/assignments/media-types/media-types.xhtml
 * @typedef Mimetypes~Kind
 * @enum
 */
const MimetypesKind = {
  opus: 'video/ogg',
  ogv: 'video/ogg',
  mp4: 'video/mp4',
  mov: 'video/mp4',
  m4v: 'video/mp4',
  mkv: 'video/x-matroska',
  m4a: 'audio/mp4',
  mp3: 'audio/mpeg',
  aac: 'audio/aac',
  caf: 'audio/x-caf',
  flac: 'audio/flac',
  oga: 'audio/ogg',
  wav: 'audio/wav',
  m3u8: 'application/x-mpegURL',
  mpd: 'application/dash+xml',
  jpg: 'image/jpeg',
  jpeg: 'image/jpeg',
  gif: 'image/gif',
  png: 'image/png',
  svg: 'image/svg+xml',
  webp: 'image/webp'
};

/**
 * Get the mimetype of a given src url if possible
 *
 * @param {string} src
 *        The url to the src
 *
 * @return {string}
 *         return the mimetype if it was known or empty string otherwise
 */
const getMimetype = function (src = '') {
  const ext = getFileExtension(src);
  const mimetype = MimetypesKind[ext.toLowerCase()];
  return mimetype || '';
};

/**
 * Find the mime type of a given source string if possible. Uses the player
 * source cache.
 *
 * @param { import('../player').default } player
 *        The player object
 *
 * @param {string} src
 *        The source string
 *
 * @return {string}
 *         The type that was found
 */
const findMimetype = (player, src) => {
  if (!src) {
    return '';
  }

  // 1. check for the type in the `source` cache
  if (player.cache_.source.src === src && player.cache_.source.type) {
    return player.cache_.source.type;
  }

  // 2. see if we have this source in our `currentSources` cache
  const matchingSources = player.cache_.sources.filter(s => s.src === src);
  if (matchingSources.length) {
    return matchingSources[0].type;
  }

  // 3. look for the src url in source elements and use the type there
  const sources = player.$$('source');
  for (let i = 0; i < sources.length; i++) {
    const s = sources[i];
    if (s.type && s.src && s.src === src) {
      return s.type;
    }
  }

  // 4. finally fallback to our list of mime types based on src url extension
  return getMimetype(src);
};

/**
 * @module filter-source
 */

/**
 * Filter out single bad source objects or multiple source objects in an
 * array. Also flattens nested source object arrays into a 1 dimensional
 * array of source objects.
 *
 * @param {Tech~SourceObject|Tech~SourceObject[]} src
 *        The src object to filter
 *
 * @return {Tech~SourceObject[]}
 *         An array of sourceobjects containing only valid sources
 *
 * @private
 */
const filterSource = function (src) {
  // traverse array
  if (Array.isArray(src)) {
    let newsrc = [];
    src.forEach(function (srcobj) {
      srcobj = filterSource(srcobj);
      if (Array.isArray(srcobj)) {
        newsrc = newsrc.concat(srcobj);
      } else if (isObject(srcobj)) {
        newsrc.push(srcobj);
      }
    });
    src = newsrc;
  } else if (typeof src === 'string' && src.trim()) {
    // convert string into object
    src = [fixSource({
      src
    })];
  } else if (isObject(src) && typeof src.src === 'string' && src.src && src.src.trim()) {
    // src is already valid
    src = [fixSource(src)];
  } else {
    // invalid source, turn it into an empty array
    src = [];
  }
  return src;
};

/**
 * Checks src mimetype, adding it when possible
 *
 * @param {Tech~SourceObject} src
 *        The src object to check
 * @return {Tech~SourceObject}
 *        src Object with known type
 */
function fixSource(src) {
  if (!src.type) {
    const mimetype = getMimetype(src.src);
    if (mimetype) {
      src.type = mimetype;
    }
  }
  return src;
}

/**
 * @file loader.js
 */

/**
 * The `MediaLoader` is the `Component` that decides which playback technology to load
 * when a player is initialized.
 *
 * @extends Component
 */
class MediaLoader extends Component {
  /**
   * Create an instance of this class.
   *
   * @param { import('../player').default } player
   *        The `Player` that this class should attach to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   *
   * @param {Function} [ready]
   *        The function that is run when this component is ready.
   */
  constructor(player, options, ready) {
    // MediaLoader has no element
    const options_ = merge({
      createEl: false
    }, options);
    super(player, options_, ready);

    // If there are no sources when the player is initialized,
    // load the first supported playback technology.

    if (!options.playerOptions.sources || options.playerOptions.sources.length === 0) {
      for (let i = 0, j = options.playerOptions.techOrder; i < j.length; i++) {
        const techName = toTitleCase(j[i]);
        let tech = Tech.getTech(techName);

        // Support old behavior of techs being registered as components.
        // Remove once that deprecated behavior is removed.
        if (!techName) {
          tech = Component.getComponent(techName);
        }

        // Check if the browser supports this technology
        if (tech && tech.isSupported()) {
          player.loadTech_(techName);
          break;
        }
      }
    } else {
      // Loop through playback technologies (e.g. HTML5) and check for support.
      // Then load the best source.
      // A few assumptions here:
      //   All playback technologies respect preload false.
      player.src(options.playerOptions.sources);
    }
  }
}
Component.registerComponent('MediaLoader', MediaLoader);

/**
 * @file clickable-component.js
 */

/**
 * Component which is clickable or keyboard actionable, but is not a
 * native HTML button.
 *
 * @extends Component
 */
class ClickableComponent extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param  { import('./player').default } player
   *         The `Player` that this class should be attached to.
   *
   * @param  {Object} [options]
   *         The key/value store of component options.
   *
   * @param  {function} [options.clickHandler]
   *         The function to call when the button is clicked / activated
   *
   * @param  {string} [options.controlText]
   *         The text to set on the button
   *
   * @param  {string} [options.className]
   *         A class or space separated list of classes to add the component
   *
   */
  constructor(player, options) {
    super(player, options);
    if (this.options_.controlText) {
      this.controlText(this.options_.controlText);
    }
    this.handleMouseOver_ = e => this.handleMouseOver(e);
    this.handleMouseOut_ = e => this.handleMouseOut(e);
    this.handleClick_ = e => this.handleClick(e);
    this.handleKeyDown_ = e => this.handleKeyDown(e);
    this.emitTapEvents();
    this.enable();
  }

  /**
   * Create the `ClickableComponent`s DOM element.
   *
   * @param {string} [tag=div]
   *        The element's node type.
   *
   * @param {Object} [props={}]
   *        An object of properties that should be set on the element.
   *
   * @param {Object} [attributes={}]
   *        An object of attributes that should be set on the element.
   *
   * @return {Element}
   *         The element that gets created.
   */
  createEl(tag = 'div', props = {}, attributes = {}) {
    props = Object.assign({
      className: this.buildCSSClass(),
      tabIndex: 0
    }, props);
    if (tag === 'button') {
      log.error(`Creating a ClickableComponent with an HTML element of ${tag} is not supported; use a Button instead.`);
    }

    // Add ARIA attributes for clickable element which is not a native HTML button
    attributes = Object.assign({
      role: 'button'
    }, attributes);
    this.tabIndex_ = props.tabIndex;
    const el = createEl(tag, props, attributes);
    el.appendChild(createEl('span', {
      className: 'vjs-icon-placeholder'
    }, {
      'aria-hidden': true
    }));
    this.createControlTextEl(el);
    return el;
  }
  dispose() {
    // remove controlTextEl_ on dispose
    this.controlTextEl_ = null;
    super.dispose();
  }

  /**
   * Create a control text element on this `ClickableComponent`
   *
   * @param {Element} [el]
   *        Parent element for the control text.
   *
   * @return {Element}
   *         The control text element that gets created.
   */
  createControlTextEl(el) {
    this.controlTextEl_ = createEl('span', {
      className: 'vjs-control-text'
    }, {
      // let the screen reader user know that the text of the element may change
      'aria-live': 'polite'
    });
    if (el) {
      el.appendChild(this.controlTextEl_);
    }
    this.controlText(this.controlText_, el);
    return this.controlTextEl_;
  }

  /**
   * Get or set the localize text to use for the controls on the `ClickableComponent`.
   *
   * @param {string} [text]
   *        Control text for element.
   *
   * @param {Element} [el=this.el()]
   *        Element to set the title on.
   *
   * @return {string}
   *         - The control text when getting
   */
  controlText(text, el = this.el()) {
    if (text === undefined) {
      return this.controlText_ || 'Need Text';
    }
    const localizedText = this.localize(text);

    /** @protected */
    this.controlText_ = text;
    textContent(this.controlTextEl_, localizedText);
    if (!this.nonIconControl && !this.player_.options_.noUITitleAttributes) {
      // Set title attribute if only an icon is shown
      el.setAttribute('title', localizedText);
    }
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `vjs-control vjs-button ${super.buildCSSClass()}`;
  }

  /**
   * Enable this `ClickableComponent`
   */
  enable() {
    if (!this.enabled_) {
      this.enabled_ = true;
      this.removeClass('vjs-disabled');
      this.el_.setAttribute('aria-disabled', 'false');
      if (typeof this.tabIndex_ !== 'undefined') {
        this.el_.setAttribute('tabIndex', this.tabIndex_);
      }
      this.on(['tap', 'click'], this.handleClick_);
      this.on('keydown', this.handleKeyDown_);
    }
  }

  /**
   * Disable this `ClickableComponent`
   */
  disable() {
    this.enabled_ = false;
    this.addClass('vjs-disabled');
    this.el_.setAttribute('aria-disabled', 'true');
    if (typeof this.tabIndex_ !== 'undefined') {
      this.el_.removeAttribute('tabIndex');
    }
    this.off('mouseover', this.handleMouseOver_);
    this.off('mouseout', this.handleMouseOut_);
    this.off(['tap', 'click'], this.handleClick_);
    this.off('keydown', this.handleKeyDown_);
  }

  /**
   * Handles language change in ClickableComponent for the player in components
   *
   *
   */
  handleLanguagechange() {
    this.controlText(this.controlText_);
  }

  /**
   * Event handler that is called when a `ClickableComponent` receives a
   * `click` or `tap` event.
   *
   * @param {Event} event
   *        The `tap` or `click` event that caused this function to be called.
   *
   * @listens tap
   * @listens click
   * @abstract
   */
  handleClick(event) {
    if (this.options_.clickHandler) {
      this.options_.clickHandler.call(this, arguments);
    }
  }

  /**
   * Event handler that is called when a `ClickableComponent` receives a
   * `keydown` event.
   *
   * By default, if the key is Space or Enter, it will trigger a `click` event.
   *
   * @param {Event} event
   *        The `keydown` event that caused this function to be called.
   *
   * @listens keydown
   */
  handleKeyDown(event) {
    // Support Space or Enter key operation to fire a click event. Also,
    // prevent the event from propagating through the DOM and triggering
    // Player hotkeys.
    if (keycode.isEventKey(event, 'Space') || keycode.isEventKey(event, 'Enter')) {
      event.preventDefault();
      event.stopPropagation();
      this.trigger('click');
    } else {
      // Pass keypress handling up for unsupported keys
      super.handleKeyDown(event);
    }
  }
}
Component.registerComponent('ClickableComponent', ClickableComponent);

/**
 * @file poster-image.js
 */

/**
 * A `ClickableComponent` that handles showing the poster image for the player.
 *
 * @extends ClickableComponent
 */
class PosterImage extends ClickableComponent {
  /**
   * Create an instance of this class.
   *
   * @param { import('./player').default } player
   *        The `Player` that this class should attach to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.update();
    this.update_ = e => this.update(e);
    player.on('posterchange', this.update_);
  }

  /**
   * Clean up and dispose of the `PosterImage`.
   */
  dispose() {
    this.player().off('posterchange', this.update_);
    super.dispose();
  }

  /**
   * Create the `PosterImage`s DOM element.
   *
   * @return {Element}
   *         The element that gets created.
   */
  createEl() {
    // The el is an empty div to keep position in the DOM
    // A picture and img el will be inserted when a source is set
    return createEl('div', {
      className: 'vjs-poster'
    });
  }

  /**
   * Get or set the `PosterImage`'s crossOrigin option.
   *
   * @param {string|null} [value]
   *        The value to set the crossOrigin to. If an argument is
   *        given, must be one of `'anonymous'` or `'use-credentials'`, or 'null'.
   *
   * @return {string|null}
   *         - The current crossOrigin value of the `Player` when getting.
   *         - undefined when setting
   */
  crossOrigin(value) {
    // `null` can be set to unset a value
    if (typeof value === 'undefined') {
      if (this.$('img')) {
        // If the poster's element exists, give its value
        return this.$('img').crossOrigin;
      } else if (this.player_.tech_ && this.player_.tech_.isReady_) {
        // If not but the tech is ready, query the tech
        return this.player_.crossOrigin();
      }
      // Otherwise check options as the  poster is usually set before the state of crossorigin
      // can be retrieved by the getter
      return this.player_.options_.crossOrigin || this.player_.options_.crossorigin || null;
    }
    if (value !== null && value !== 'anonymous' && value !== 'use-credentials') {
      this.player_.log.warn(`crossOrigin must be null,  "anonymous" or "use-credentials", given "${value}"`);
      return;
    }
    if (this.$('img')) {
      this.$('img').crossOrigin = value;
    }
    return;
  }

  /**
   * An {@link EventTarget~EventListener} for {@link Player#posterchange} events.
   *
   * @listens Player#posterchange
   *
   * @param {Event} [event]
   *        The `Player#posterchange` event that triggered this function.
   */
  update(event) {
    const url = this.player().poster();
    this.setSrc(url);

    // If there's no poster source we should display:none on this component
    // so it's not still clickable or right-clickable
    if (url) {
      this.show();
    } else {
      this.hide();
    }
  }

  /**
   * Set the source of the `PosterImage` depending on the display method. (Re)creates
   * the inner picture and img elementss when needed.
   *
   * @param {string} [url]
   *        The URL to the source for the `PosterImage`. If not specified or falsy,
   *        any source and ant inner picture/img are removed.
   */
  setSrc(url) {
    if (!url) {
      this.el_.textContent = '';
      return;
    }
    if (!this.$('img')) {
      this.el_.appendChild(createEl('picture', {
        className: 'vjs-poster',
        // Don't want poster to be tabbable.
        tabIndex: -1
      }, {}, createEl('img', {
        loading: 'lazy',
        crossOrigin: this.crossOrigin()
      }, {
        alt: ''
      })));
    }
    this.$('img').src = url;
  }

  /**
   * An {@link EventTarget~EventListener} for clicks on the `PosterImage`. See
   * {@link ClickableComponent#handleClick} for instances where this will be triggered.
   *
   * @listens tap
   * @listens click
   * @listens keydown
   *
   * @param {Event} event
   +        The `click`, `tap` or `keydown` event that caused this function to be called.
   */
  handleClick(event) {
    // We don't want a click to trigger playback when controls are disabled
    if (!this.player_.controls()) {
      return;
    }
    if (this.player_.tech(true)) {
      this.player_.tech(true).focus();
    }
    if (this.player_.paused()) {
      silencePromise(this.player_.play());
    } else {
      this.player_.pause();
    }
  }
}

/**
 * Get or set the `PosterImage`'s crossorigin option. For the HTML5 player, this
 * sets the `crossOrigin` property on the `<img>` tag to control the CORS
 * behavior.
 *
 * @param {string|null} [value]
 *        The value to set the `PosterImages`'s crossorigin to. If an argument is
 *        given, must be one of `anonymous` or `use-credentials`.
 *
 * @return {string|null|undefined}
 *         - The current crossorigin value of the `Player` when getting.
 *         - undefined when setting
 */
PosterImage.prototype.crossorigin = PosterImage.prototype.crossOrigin;
Component.registerComponent('PosterImage', PosterImage);

/**
 * @file text-track-display.js
 */
const darkGray = '#222';
const lightGray = '#ccc';
const fontMap = {
  monospace: 'monospace',
  sansSerif: 'sans-serif',
  serif: 'serif',
  monospaceSansSerif: '"Andale Mono", "Lucida Console", monospace',
  monospaceSerif: '"Courier New", monospace',
  proportionalSansSerif: 'sans-serif',
  proportionalSerif: 'serif',
  casual: '"Comic Sans MS", Impact, fantasy',
  script: '"Monotype Corsiva", cursive',
  smallcaps: '"Andale Mono", "Lucida Console", monospace, sans-serif'
};

/**
 * Construct an rgba color from a given hex color code.
 *
 * @param {number} color
 *        Hex number for color, like #f0e or #f604e2.
 *
 * @param {number} opacity
 *        Value for opacity, 0.0 - 1.0.
 *
 * @return {string}
 *         The rgba color that was created, like 'rgba(255, 0, 0, 0.3)'.
 */
function constructColor(color, opacity) {
  let hex;
  if (color.length === 4) {
    // color looks like "#f0e"
    hex = color[1] + color[1] + color[2] + color[2] + color[3] + color[3];
  } else if (color.length === 7) {
    // color looks like "#f604e2"
    hex = color.slice(1);
  } else {
    throw new Error('Invalid color code provided, ' + color + '; must be formatted as e.g. #f0e or #f604e2.');
  }
  return 'rgba(' + parseInt(hex.slice(0, 2), 16) + ',' + parseInt(hex.slice(2, 4), 16) + ',' + parseInt(hex.slice(4, 6), 16) + ',' + opacity + ')';
}

/**
 * Try to update the style of a DOM element. Some style changes will throw an error,
 * particularly in IE8. Those should be noops.
 *
 * @param {Element} el
 *        The DOM element to be styled.
 *
 * @param {string} style
 *        The CSS property on the element that should be styled.
 *
 * @param {string} rule
 *        The style rule that should be applied to the property.
 *
 * @private
 */
function tryUpdateStyle(el, style, rule) {
  try {
    el.style[style] = rule;
  } catch (e) {
    // Satisfies linter.
    return;
  }
}

/**
 * The component for displaying text track cues.
 *
 * @extends Component
 */
class TextTrackDisplay extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   *
   * @param {Function} [ready]
   *        The function to call when `TextTrackDisplay` is ready.
   */
  constructor(player, options, ready) {
    super(player, options, ready);
    const updateDisplayHandler = e => this.updateDisplay(e);
    player.on('loadstart', e => this.toggleDisplay(e));
    player.on('texttrackchange', updateDisplayHandler);
    player.on('loadedmetadata', e => this.preselectTrack(e));

    // This used to be called during player init, but was causing an error
    // if a track should show by default and the display hadn't loaded yet.
    // Should probably be moved to an external track loader when we support
    // tracks that don't need a display.
    player.ready(bind_(this, function () {
      if (player.tech_ && player.tech_.featuresNativeTextTracks) {
        this.hide();
        return;
      }
      player.on('fullscreenchange', updateDisplayHandler);
      player.on('playerresize', updateDisplayHandler);
      const screenOrientation = window.screen.orientation || window;
      const changeOrientationEvent = window.screen.orientation ? 'change' : 'orientationchange';
      screenOrientation.addEventListener(changeOrientationEvent, updateDisplayHandler);
      player.on('dispose', () => screenOrientation.removeEventListener(changeOrientationEvent, updateDisplayHandler));
      const tracks = this.options_.playerOptions.tracks || [];
      for (let i = 0; i < tracks.length; i++) {
        this.player_.addRemoteTextTrack(tracks[i], true);
      }
      this.preselectTrack();
    }));
  }

  /**
  * Preselect a track following this precedence:
  * - matches the previously selected {@link TextTrack}'s language and kind
  * - matches the previously selected {@link TextTrack}'s language only
  * - is the first default captions track
  * - is the first default descriptions track
  *
  * @listens Player#loadstart
  */
  preselectTrack() {
    const modes = {
      captions: 1,
      subtitles: 1
    };
    const trackList = this.player_.textTracks();
    const userPref = this.player_.cache_.selectedLanguage;
    let firstDesc;
    let firstCaptions;
    let preferredTrack;
    for (let i = 0; i < trackList.length; i++) {
      const track = trackList[i];
      if (userPref && userPref.enabled && userPref.language && userPref.language === track.language && track.kind in modes) {
        // Always choose the track that matches both language and kind
        if (track.kind === userPref.kind) {
          preferredTrack = track;
          // or choose the first track that matches language
        } else if (!preferredTrack) {
          preferredTrack = track;
        }

        // clear everything if offTextTrackMenuItem was clicked
      } else if (userPref && !userPref.enabled) {
        preferredTrack = null;
        firstDesc = null;
        firstCaptions = null;
      } else if (track.default) {
        if (track.kind === 'descriptions' && !firstDesc) {
          firstDesc = track;
        } else if (track.kind in modes && !firstCaptions) {
          firstCaptions = track;
        }
      }
    }

    // The preferredTrack matches the user preference and takes
    // precedence over all the other tracks.
    // So, display the preferredTrack before the first default track
    // and the subtitles/captions track before the descriptions track
    if (preferredTrack) {
      preferredTrack.mode = 'showing';
    } else if (firstCaptions) {
      firstCaptions.mode = 'showing';
    } else if (firstDesc) {
      firstDesc.mode = 'showing';
    }
  }

  /**
   * Turn display of {@link TextTrack}'s from the current state into the other state.
   * There are only two states:
   * - 'shown'
   * - 'hidden'
   *
   * @listens Player#loadstart
   */
  toggleDisplay() {
    if (this.player_.tech_ && this.player_.tech_.featuresNativeTextTracks) {
      this.hide();
    } else {
      this.show();
    }
  }

  /**
   * Create the {@link Component}'s DOM element.
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    return super.createEl('div', {
      className: 'vjs-text-track-display'
    }, {
      'translate': 'yes',
      'aria-live': 'off',
      'aria-atomic': 'true'
    });
  }

  /**
   * Clear all displayed {@link TextTrack}s.
   */
  clearDisplay() {
    if (typeof window.WebVTT === 'function') {
      window.WebVTT.processCues(window, [], this.el_);
    }
  }

  /**
   * Update the displayed TextTrack when a either a {@link Player#texttrackchange} or
   * a {@link Player#fullscreenchange} is fired.
   *
   * @listens Player#texttrackchange
   * @listens Player#fullscreenchange
   */
  updateDisplay() {
    const tracks = this.player_.textTracks();
    const allowMultipleShowingTracks = this.options_.allowMultipleShowingTracks;
    this.clearDisplay();
    if (allowMultipleShowingTracks) {
      const showingTracks = [];
      for (let i = 0; i < tracks.length; ++i) {
        const track = tracks[i];
        if (track.mode !== 'showing') {
          continue;
        }
        showingTracks.push(track);
      }
      this.updateForTrack(showingTracks);
      return;
    }

    //  Track display prioritization model: if multiple tracks are 'showing',
    //  display the first 'subtitles' or 'captions' track which is 'showing',
    //  otherwise display the first 'descriptions' track which is 'showing'

    let descriptionsTrack = null;
    let captionsSubtitlesTrack = null;
    let i = tracks.length;
    while (i--) {
      const track = tracks[i];
      if (track.mode === 'showing') {
        if (track.kind === 'descriptions') {
          descriptionsTrack = track;
        } else {
          captionsSubtitlesTrack = track;
        }
      }
    }
    if (captionsSubtitlesTrack) {
      if (this.getAttribute('aria-live') !== 'off') {
        this.setAttribute('aria-live', 'off');
      }
      this.updateForTrack(captionsSubtitlesTrack);
    } else if (descriptionsTrack) {
      if (this.getAttribute('aria-live') !== 'assertive') {
        this.setAttribute('aria-live', 'assertive');
      }
      this.updateForTrack(descriptionsTrack);
    }
  }

  /**
   * Style {@Link TextTrack} activeCues according to {@Link TextTrackSettings}.
   *
   * @param {TextTrack} track
   *        Text track object containing active cues to style.
   */
  updateDisplayState(track) {
    const overrides = this.player_.textTrackSettings.getValues();
    const cues = track.activeCues;
    let i = cues.length;
    while (i--) {
      const cue = cues[i];
      if (!cue) {
        continue;
      }
      const cueDiv = cue.displayState;
      if (overrides.color) {
        cueDiv.firstChild.style.color = overrides.color;
      }
      if (overrides.textOpacity) {
        tryUpdateStyle(cueDiv.firstChild, 'color', constructColor(overrides.color || '#fff', overrides.textOpacity));
      }
      if (overrides.backgroundColor) {
        cueDiv.firstChild.style.backgroundColor = overrides.backgroundColor;
      }
      if (overrides.backgroundOpacity) {
        tryUpdateStyle(cueDiv.firstChild, 'backgroundColor', constructColor(overrides.backgroundColor || '#000', overrides.backgroundOpacity));
      }
      if (overrides.windowColor) {
        if (overrides.windowOpacity) {
          tryUpdateStyle(cueDiv, 'backgroundColor', constructColor(overrides.windowColor, overrides.windowOpacity));
        } else {
          cueDiv.style.backgroundColor = overrides.windowColor;
        }
      }
      if (overrides.edgeStyle) {
        if (overrides.edgeStyle === 'dropshadow') {
          cueDiv.firstChild.style.textShadow = `2px 2px 3px ${darkGray}, 2px 2px 4px ${darkGray}, 2px 2px 5px ${darkGray}`;
        } else if (overrides.edgeStyle === 'raised') {
          cueDiv.firstChild.style.textShadow = `1px 1px ${darkGray}, 2px 2px ${darkGray}, 3px 3px ${darkGray}`;
        } else if (overrides.edgeStyle === 'depressed') {
          cueDiv.firstChild.style.textShadow = `1px 1px ${lightGray}, 0 1px ${lightGray}, -1px -1px ${darkGray}, 0 -1px ${darkGray}`;
        } else if (overrides.edgeStyle === 'uniform') {
          cueDiv.firstChild.style.textShadow = `0 0 4px ${darkGray}, 0 0 4px ${darkGray}, 0 0 4px ${darkGray}, 0 0 4px ${darkGray}`;
        }
      }
      if (overrides.fontPercent && overrides.fontPercent !== 1) {
        const fontSize = window.parseFloat(cueDiv.style.fontSize);
        cueDiv.style.fontSize = fontSize * overrides.fontPercent + 'px';
        cueDiv.style.height = 'auto';
        cueDiv.style.top = 'auto';
      }
      if (overrides.fontFamily && overrides.fontFamily !== 'default') {
        if (overrides.fontFamily === 'small-caps') {
          cueDiv.firstChild.style.fontVariant = 'small-caps';
        } else {
          cueDiv.firstChild.style.fontFamily = fontMap[overrides.fontFamily];
        }
      }
    }
  }

  /**
   * Add an {@link TextTrack} to to the {@link Tech}s {@link TextTrackList}.
   *
   * @param {TextTrack|TextTrack[]} tracks
   *        Text track object or text track array to be added to the list.
   */
  updateForTrack(tracks) {
    if (!Array.isArray(tracks)) {
      tracks = [tracks];
    }
    if (typeof window.WebVTT !== 'function' || tracks.every(track => {
      return !track.activeCues;
    })) {
      return;
    }
    const cues = [];

    // push all active track cues
    for (let i = 0; i < tracks.length; ++i) {
      const track = tracks[i];
      for (let j = 0; j < track.activeCues.length; ++j) {
        cues.push(track.activeCues[j]);
      }
    }

    // removes all cues before it processes new ones
    window.WebVTT.processCues(window, cues, this.el_);

    // add unique class to each language text track & add settings styling if necessary
    for (let i = 0; i < tracks.length; ++i) {
      const track = tracks[i];
      for (let j = 0; j < track.activeCues.length; ++j) {
        const cueEl = track.activeCues[j].displayState;
        addClass(cueEl, 'vjs-text-track-cue', 'vjs-text-track-cue-' + (track.language ? track.language : i));
        if (track.language) {
          setAttribute(cueEl, 'lang', track.language);
        }
      }
      if (this.player_.textTrackSettings) {
        this.updateDisplayState(track);
      }
    }
  }
}
Component.registerComponent('TextTrackDisplay', TextTrackDisplay);

/**
 * @file loading-spinner.js
 */

/**
 * A loading spinner for use during waiting/loading events.
 *
 * @extends Component
 */
class LoadingSpinner extends Component {
  /**
   * Create the `LoadingSpinner`s DOM element.
   *
   * @return {Element}
   *         The dom element that gets created.
   */
  createEl() {
    const isAudio = this.player_.isAudio();
    const playerType = this.localize(isAudio ? 'Audio Player' : 'Video Player');
    const controlText = createEl('span', {
      className: 'vjs-control-text',
      textContent: this.localize('{1} is loading.', [playerType])
    });
    const el = super.createEl('div', {
      className: 'vjs-loading-spinner',
      dir: 'ltr'
    });
    el.appendChild(controlText);
    return el;
  }

  /**
   * Update control text on languagechange
   */
  handleLanguagechange() {
    this.$('.vjs-control-text').textContent = this.localize('{1} is loading.', [this.player_.isAudio() ? 'Audio Player' : 'Video Player']);
  }
}
Component.registerComponent('LoadingSpinner', LoadingSpinner);

/**
 * @file button.js
 */

/**
 * Base class for all buttons.
 *
 * @extends ClickableComponent
 */
class Button extends ClickableComponent {
  /**
   * Create the `Button`s DOM element.
   *
   * @param {string} [tag="button"]
   *        The element's node type. This argument is IGNORED: no matter what
   *        is passed, it will always create a `button` element.
   *
   * @param {Object} [props={}]
   *        An object of properties that should be set on the element.
   *
   * @param {Object} [attributes={}]
   *        An object of attributes that should be set on the element.
   *
   * @return {Element}
   *         The element that gets created.
   */
  createEl(tag, props = {}, attributes = {}) {
    tag = 'button';
    props = Object.assign({
      className: this.buildCSSClass()
    }, props);

    // Add attributes for button element
    attributes = Object.assign({
      // Necessary since the default button type is "submit"
      type: 'button'
    }, attributes);
    const el = createEl(tag, props, attributes);
    el.appendChild(createEl('span', {
      className: 'vjs-icon-placeholder'
    }, {
      'aria-hidden': true
    }));
    this.createControlTextEl(el);
    return el;
  }

  /**
   * Add a child `Component` inside of this `Button`.
   *
   * @param {string|Component} child
   *        The name or instance of a child to add.
   *
   * @param {Object} [options={}]
   *        The key/value store of options that will get passed to children of
   *        the child.
   *
   * @return {Component}
   *         The `Component` that gets added as a child. When using a string the
   *         `Component` will get created by this process.
   *
   * @deprecated since version 5
   */
  addChild(child, options = {}) {
    const className = this.constructor.name;
    log.warn(`Adding an actionable (user controllable) child to a Button (${className}) is not supported; use a ClickableComponent instead.`);

    // Avoid the error message generated by ClickableComponent's addChild method
    return Component.prototype.addChild.call(this, child, options);
  }

  /**
   * Enable the `Button` element so that it can be activated or clicked. Use this with
   * {@link Button#disable}.
   */
  enable() {
    super.enable();
    this.el_.removeAttribute('disabled');
  }

  /**
   * Disable the `Button` element so that it cannot be activated or clicked. Use this with
   * {@link Button#enable}.
   */
  disable() {
    super.disable();
    this.el_.setAttribute('disabled', 'disabled');
  }

  /**
   * This gets called when a `Button` has focus and `keydown` is triggered via a key
   * press.
   *
   * @param {Event} event
   *        The event that caused this function to get called.
   *
   * @listens keydown
   */
  handleKeyDown(event) {
    // Ignore Space or Enter key operation, which is handled by the browser for
    // a button - though not for its super class, ClickableComponent. Also,
    // prevent the event from propagating through the DOM and triggering Player
    // hotkeys. We do not preventDefault here because we _want_ the browser to
    // handle it.
    if (keycode.isEventKey(event, 'Space') || keycode.isEventKey(event, 'Enter')) {
      event.stopPropagation();
      return;
    }

    // Pass keypress handling up for unsupported keys
    super.handleKeyDown(event);
  }
}
Component.registerComponent('Button', Button);

/**
 * @file big-play-button.js
 */

/**
 * The initial play button that shows before the video has played. The hiding of the
 * `BigPlayButton` get done via CSS and `Player` states.
 *
 * @extends Button
 */
class BigPlayButton extends Button {
  constructor(player, options) {
    super(player, options);
    this.mouseused_ = false;
    this.on('mousedown', e => this.handleMouseDown(e));
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object. Always returns 'vjs-big-play-button'.
   */
  buildCSSClass() {
    return 'vjs-big-play-button';
  }

  /**
   * This gets called when a `BigPlayButton` "clicked". See {@link ClickableComponent}
   * for more detailed information on what a click can be.
   *
   * @param {KeyboardEvent} event
   *        The `keydown`, `tap`, or `click` event that caused this function to be
   *        called.
   *
   * @listens tap
   * @listens click
   */
  handleClick(event) {
    const playPromise = this.player_.play();

    // exit early if clicked via the mouse
    if (this.mouseused_ && event.clientX && event.clientY) {
      silencePromise(playPromise);
      if (this.player_.tech(true)) {
        this.player_.tech(true).focus();
      }
      return;
    }
    const cb = this.player_.getChild('controlBar');
    const playToggle = cb && cb.getChild('playToggle');
    if (!playToggle) {
      this.player_.tech(true).focus();
      return;
    }
    const playFocus = () => playToggle.focus();
    if (isPromise(playPromise)) {
      playPromise.then(playFocus, () => {});
    } else {
      this.setTimeout(playFocus, 1);
    }
  }
  handleKeyDown(event) {
    this.mouseused_ = false;
    super.handleKeyDown(event);
  }
  handleMouseDown(event) {
    this.mouseused_ = true;
  }
}

/**
 * The text that should display over the `BigPlayButton`s controls. Added to for localization.
 *
 * @type {string}
 * @protected
 */
BigPlayButton.prototype.controlText_ = 'Play Video';
Component.registerComponent('BigPlayButton', BigPlayButton);

/**
 * @file close-button.js
 */

/**
 * The `CloseButton` is a `{@link Button}` that fires a `close` event when
 * it gets clicked.
 *
 * @extends Button
 */
class CloseButton extends Button {
  /**
  * Creates an instance of the this class.
  *
  * @param  { import('./player').default } player
  *         The `Player` that this class should be attached to.
  *
  * @param  {Object} [options]
  *         The key/value store of player options.
  */
  constructor(player, options) {
    super(player, options);
    this.controlText(options && options.controlText || this.localize('Close'));
  }

  /**
  * Builds the default DOM `className`.
  *
  * @return {string}
  *         The DOM `className` for this object.
  */
  buildCSSClass() {
    return `vjs-close-button ${super.buildCSSClass()}`;
  }

  /**
   * This gets called when a `CloseButton` gets clicked. See
   * {@link ClickableComponent#handleClick} for more information on when
   * this will be triggered
   *
   * @param {Event} event
   *        The `keydown`, `tap`, or `click` event that caused this function to be
   *        called.
   *
   * @listens tap
   * @listens click
   * @fires CloseButton#close
   */
  handleClick(event) {
    /**
     * Triggered when the a `CloseButton` is clicked.
     *
     * @event CloseButton#close
     * @type {Event}
     *
     * @property {boolean} [bubbles=false]
     *           set to false so that the close event does not
     *           bubble up to parents if there is no listener
     */
    this.trigger({
      type: 'close',
      bubbles: false
    });
  }
  /**
   * Event handler that is called when a `CloseButton` receives a
   * `keydown` event.
   *
   * By default, if the key is Esc, it will trigger a `click` event.
   *
   * @param {Event} event
   *        The `keydown` event that caused this function to be called.
   *
   * @listens keydown
   */
  handleKeyDown(event) {
    // Esc button will trigger `click` event
    if (keycode.isEventKey(event, 'Esc')) {
      event.preventDefault();
      event.stopPropagation();
      this.trigger('click');
    } else {
      // Pass keypress handling up for unsupported keys
      super.handleKeyDown(event);
    }
  }
}
Component.registerComponent('CloseButton', CloseButton);

/**
 * @file play-toggle.js
 */

/**
 * Button to toggle between play and pause.
 *
 * @extends Button
 */
class PlayToggle extends Button {
  /**
   * Creates an instance of this class.
   *
   * @param { import('./player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options={}]
   *        The key/value store of player options.
   */
  constructor(player, options = {}) {
    super(player, options);

    // show or hide replay icon
    options.replay = options.replay === undefined || options.replay;
    this.on(player, 'play', e => this.handlePlay(e));
    this.on(player, 'pause', e => this.handlePause(e));
    if (options.replay) {
      this.on(player, 'ended', e => this.handleEnded(e));
    }
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `vjs-play-control ${super.buildCSSClass()}`;
  }

  /**
   * This gets called when an `PlayToggle` is "clicked". See
   * {@link ClickableComponent} for more detailed information on what a click can be.
   *
   * @param {Event} [event]
   *        The `keydown`, `tap`, or `click` event that caused this function to be
   *        called.
   *
   * @listens tap
   * @listens click
   */
  handleClick(event) {
    if (this.player_.paused()) {
      silencePromise(this.player_.play());
    } else {
      this.player_.pause();
    }
  }

  /**
   * This gets called once after the video has ended and the user seeks so that
   * we can change the replay button back to a play button.
   *
   * @param {Event} [event]
   *        The event that caused this function to run.
   *
   * @listens Player#seeked
   */
  handleSeeked(event) {
    this.removeClass('vjs-ended');
    if (this.player_.paused()) {
      this.handlePause(event);
    } else {
      this.handlePlay(event);
    }
  }

  /**
   * Add the vjs-playing class to the element so it can change appearance.
   *
   * @param {Event} [event]
   *        The event that caused this function to run.
   *
   * @listens Player#play
   */
  handlePlay(event) {
    this.removeClass('vjs-ended', 'vjs-paused');
    this.addClass('vjs-playing');
    // change the button text to "Pause"
    this.controlText('Pause');
  }

  /**
   * Add the vjs-paused class to the element so it can change appearance.
   *
   * @param {Event} [event]
   *        The event that caused this function to run.
   *
   * @listens Player#pause
   */
  handlePause(event) {
    this.removeClass('vjs-playing');
    this.addClass('vjs-paused');
    // change the button text to "Play"
    this.controlText('Play');
  }

  /**
   * Add the vjs-ended class to the element so it can change appearance
   *
   * @param {Event} [event]
   *        The event that caused this function to run.
   *
   * @listens Player#ended
   */
  handleEnded(event) {
    this.removeClass('vjs-playing');
    this.addClass('vjs-ended');
    // change the button text to "Replay"
    this.controlText('Replay');

    // on the next seek remove the replay button
    this.one(this.player_, 'seeked', e => this.handleSeeked(e));
  }
}

/**
 * The text that should display over the `PlayToggle`s controls. Added for localization.
 *
 * @type {string}
 * @protected
 */
PlayToggle.prototype.controlText_ = 'Play';
Component.registerComponent('PlayToggle', PlayToggle);

/**
 * @file time-display.js
 */

/**
 * Displays time information about the video
 *
 * @extends Component
 */
class TimeDisplay extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.on(player, ['timeupdate', 'ended'], e => this.updateContent(e));
    this.updateTextNode_();
  }

  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    const className = this.buildCSSClass();
    const el = super.createEl('div', {
      className: `${className} vjs-time-control vjs-control`
    });
    const span = createEl('span', {
      className: 'vjs-control-text',
      textContent: `${this.localize(this.labelText_)}\u00a0`
    }, {
      role: 'presentation'
    });
    el.appendChild(span);
    this.contentEl_ = createEl('span', {
      className: `${className}-display`
    }, {
      // span elements have no implicit role, but some screen readers (notably VoiceOver)
      // treat them as a break between items in the DOM when using arrow keys
      // (or left-to-right swipes on iOS) to read contents of a page. Using
      // role='presentation' causes VoiceOver to NOT treat this span as a break.
      role: 'presentation'
    });
    el.appendChild(this.contentEl_);
    return el;
  }
  dispose() {
    this.contentEl_ = null;
    this.textNode_ = null;
    super.dispose();
  }

  /**
   * Updates the time display text node with a new time
   *
   * @param {number} [time=0] the time to update to
   *
   * @private
   */
  updateTextNode_(time = 0) {
    time = formatTime(time);
    if (this.formattedTime_ === time) {
      return;
    }
    this.formattedTime_ = time;
    this.requestNamedAnimationFrame('TimeDisplay#updateTextNode_', () => {
      if (!this.contentEl_) {
        return;
      }
      let oldNode = this.textNode_;
      if (oldNode && this.contentEl_.firstChild !== oldNode) {
        oldNode = null;
        log.warn('TimeDisplay#updateTextnode_: Prevented replacement of text node element since it was no longer a child of this node. Appending a new node instead.');
      }
      this.textNode_ = document.createTextNode(this.formattedTime_);
      if (!this.textNode_) {
        return;
      }
      if (oldNode) {
        this.contentEl_.replaceChild(this.textNode_, oldNode);
      } else {
        this.contentEl_.appendChild(this.textNode_);
      }
    });
  }

  /**
   * To be filled out in the child class, should update the displayed time
   * in accordance with the fact that the current time has changed.
   *
   * @param {Event} [event]
   *        The `timeupdate`  event that caused this to run.
   *
   * @listens Player#timeupdate
   */
  updateContent(event) {}
}

/**
 * The text that is added to the `TimeDisplay` for screen reader users.
 *
 * @type {string}
 * @private
 */
TimeDisplay.prototype.labelText_ = 'Time';

/**
 * The text that should display over the `TimeDisplay`s controls. Added to for localization.
 *
 * @type {string}
 * @protected
 *
 * @deprecated in v7; controlText_ is not used in non-active display Components
 */
TimeDisplay.prototype.controlText_ = 'Time';
Component.registerComponent('TimeDisplay', TimeDisplay);

/**
 * @file current-time-display.js
 */

/**
 * Displays the current time
 *
 * @extends Component
 */
class CurrentTimeDisplay extends TimeDisplay {
  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return 'vjs-current-time';
  }

  /**
   * Update current time display
   *
   * @param {Event} [event]
   *        The `timeupdate` event that caused this function to run.
   *
   * @listens Player#timeupdate
   */
  updateContent(event) {
    // Allows for smooth scrubbing, when player can't keep up.
    let time;
    if (this.player_.ended()) {
      time = this.player_.duration();
    } else {
      time = this.player_.scrubbing() ? this.player_.getCache().currentTime : this.player_.currentTime();
    }
    this.updateTextNode_(time);
  }
}

/**
 * The text that is added to the `CurrentTimeDisplay` for screen reader users.
 *
 * @type {string}
 * @private
 */
CurrentTimeDisplay.prototype.labelText_ = 'Current Time';

/**
 * The text that should display over the `CurrentTimeDisplay`s controls. Added to for localization.
 *
 * @type {string}
 * @protected
 *
 * @deprecated in v7; controlText_ is not used in non-active display Components
 */
CurrentTimeDisplay.prototype.controlText_ = 'Current Time';
Component.registerComponent('CurrentTimeDisplay', CurrentTimeDisplay);

/**
 * @file duration-display.js
 */

/**
 * Displays the duration
 *
 * @extends Component
 */
class DurationDisplay extends TimeDisplay {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    const updateContent = e => this.updateContent(e);

    // we do not want to/need to throttle duration changes,
    // as they should always display the changed duration as
    // it has changed
    this.on(player, 'durationchange', updateContent);

    // Listen to loadstart because the player duration is reset when a new media element is loaded,
    // but the durationchange on the user agent will not fire.
    // @see [Spec]{@link https://www.w3.org/TR/2011/WD-html5-20110113/video.html#media-element-load-algorithm}
    this.on(player, 'loadstart', updateContent);

    // Also listen for timeupdate (in the parent) and loadedmetadata because removing those
    // listeners could have broken dependent applications/libraries. These
    // can likely be removed for 7.0.
    this.on(player, 'loadedmetadata', updateContent);
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return 'vjs-duration';
  }

  /**
   * Update duration time display.
   *
   * @param {Event} [event]
   *        The `durationchange`, `timeupdate`, or `loadedmetadata` event that caused
   *        this function to be called.
   *
   * @listens Player#durationchange
   * @listens Player#timeupdate
   * @listens Player#loadedmetadata
   */
  updateContent(event) {
    const duration = this.player_.duration();
    this.updateTextNode_(duration);
  }
}

/**
 * The text that is added to the `DurationDisplay` for screen reader users.
 *
 * @type {string}
 * @private
 */
DurationDisplay.prototype.labelText_ = 'Duration';

/**
 * The text that should display over the `DurationDisplay`s controls. Added to for localization.
 *
 * @type {string}
 * @protected
 *
 * @deprecated in v7; controlText_ is not used in non-active display Components
 */
DurationDisplay.prototype.controlText_ = 'Duration';
Component.registerComponent('DurationDisplay', DurationDisplay);

/**
 * @file time-divider.js
 */

/**
 * The separator between the current time and duration.
 * Can be hidden if it's not needed in the design.
 *
 * @extends Component
 */
class TimeDivider extends Component {
  /**
   * Create the component's DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    const el = super.createEl('div', {
      className: 'vjs-time-control vjs-time-divider'
    }, {
      // this element and its contents can be hidden from assistive techs since
      // it is made extraneous by the announcement of the control text
      // for the current time and duration displays
      'aria-hidden': true
    });
    const div = super.createEl('div');
    const span = super.createEl('span', {
      textContent: '/'
    });
    div.appendChild(span);
    el.appendChild(div);
    return el;
  }
}
Component.registerComponent('TimeDivider', TimeDivider);

/**
 * @file remaining-time-display.js
 */

/**
 * Displays the time left in the video
 *
 * @extends Component
 */
class RemainingTimeDisplay extends TimeDisplay {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.on(player, 'durationchange', e => this.updateContent(e));
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return 'vjs-remaining-time';
  }

  /**
   * Create the `Component`'s DOM element with the "minus" character prepend to the time
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    const el = super.createEl();
    if (this.options_.displayNegative !== false) {
      el.insertBefore(createEl('span', {}, {
        'aria-hidden': true
      }, '-'), this.contentEl_);
    }
    return el;
  }

  /**
   * Update remaining time display.
   *
   * @param {Event} [event]
   *        The `timeupdate` or `durationchange` event that caused this to run.
   *
   * @listens Player#timeupdate
   * @listens Player#durationchange
   */
  updateContent(event) {
    if (typeof this.player_.duration() !== 'number') {
      return;
    }
    let time;

    // @deprecated We should only use remainingTimeDisplay
    // as of video.js 7
    if (this.player_.ended()) {
      time = 0;
    } else if (this.player_.remainingTimeDisplay) {
      time = this.player_.remainingTimeDisplay();
    } else {
      time = this.player_.remainingTime();
    }
    this.updateTextNode_(time);
  }
}

/**
 * The text that is added to the `RemainingTimeDisplay` for screen reader users.
 *
 * @type {string}
 * @private
 */
RemainingTimeDisplay.prototype.labelText_ = 'Remaining Time';

/**
 * The text that should display over the `RemainingTimeDisplay`s controls. Added to for localization.
 *
 * @type {string}
 * @protected
 *
 * @deprecated in v7; controlText_ is not used in non-active display Components
 */
RemainingTimeDisplay.prototype.controlText_ = 'Remaining Time';
Component.registerComponent('RemainingTimeDisplay', RemainingTimeDisplay);

/**
 * @file live-display.js
 */

// TODO - Future make it click to snap to live

/**
 * Displays the live indicator when duration is Infinity.
 *
 * @extends Component
 */
class LiveDisplay extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('./player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.updateShowing();
    this.on(this.player(), 'durationchange', e => this.updateShowing(e));
  }

  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    const el = super.createEl('div', {
      className: 'vjs-live-control vjs-control'
    });
    this.contentEl_ = createEl('div', {
      className: 'vjs-live-display'
    }, {
      'aria-live': 'off'
    });
    this.contentEl_.appendChild(createEl('span', {
      className: 'vjs-control-text',
      textContent: `${this.localize('Stream Type')}\u00a0`
    }));
    this.contentEl_.appendChild(document.createTextNode(this.localize('LIVE')));
    el.appendChild(this.contentEl_);
    return el;
  }
  dispose() {
    this.contentEl_ = null;
    super.dispose();
  }

  /**
   * Check the duration to see if the LiveDisplay should be showing or not. Then show/hide
   * it accordingly
   *
   * @param {Event} [event]
   *        The {@link Player#durationchange} event that caused this function to run.
   *
   * @listens Player#durationchange
   */
  updateShowing(event) {
    if (this.player().duration() === Infinity) {
      this.show();
    } else {
      this.hide();
    }
  }
}
Component.registerComponent('LiveDisplay', LiveDisplay);

/**
 * @file seek-to-live.js
 */

/**
 * Displays the live indicator when duration is Infinity.
 *
 * @extends Component
 */
class SeekToLive extends Button {
  /**
   * Creates an instance of this class.
   *
   * @param { import('./player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.updateLiveEdgeStatus();
    if (this.player_.liveTracker) {
      this.updateLiveEdgeStatusHandler_ = e => this.updateLiveEdgeStatus(e);
      this.on(this.player_.liveTracker, 'liveedgechange', this.updateLiveEdgeStatusHandler_);
    }
  }

  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    const el = super.createEl('button', {
      className: 'vjs-seek-to-live-control vjs-control'
    });
    this.textEl_ = createEl('span', {
      className: 'vjs-seek-to-live-text',
      textContent: this.localize('LIVE')
    }, {
      'aria-hidden': 'true'
    });
    el.appendChild(this.textEl_);
    return el;
  }

  /**
   * Update the state of this button if we are at the live edge
   * or not
   */
  updateLiveEdgeStatus() {
    // default to live edge
    if (!this.player_.liveTracker || this.player_.liveTracker.atLiveEdge()) {
      this.setAttribute('aria-disabled', true);
      this.addClass('vjs-at-live-edge');
      this.controlText('Seek to live, currently playing live');
    } else {
      this.setAttribute('aria-disabled', false);
      this.removeClass('vjs-at-live-edge');
      this.controlText('Seek to live, currently behind live');
    }
  }

  /**
   * On click bring us as near to the live point as possible.
   * This requires that we wait for the next `live-seekable-change`
   * event which will happen every segment length seconds.
   */
  handleClick() {
    this.player_.liveTracker.seekToLiveEdge();
  }

  /**
   * Dispose of the element and stop tracking
   */
  dispose() {
    if (this.player_.liveTracker) {
      this.off(this.player_.liveTracker, 'liveedgechange', this.updateLiveEdgeStatusHandler_);
    }
    this.textEl_ = null;
    super.dispose();
  }
}
/**
 * The text that should display over the `SeekToLive`s control. Added for localization.
 *
 * @type {string}
 * @protected
 */
SeekToLive.prototype.controlText_ = 'Seek to live, currently playing live';
Component.registerComponent('SeekToLive', SeekToLive);

/**
 * @file num.js
 * @module num
 */

/**
 * Keep a number between a min and a max value
 *
 * @param {number} number
 *        The number to clamp
 *
 * @param {number} min
 *        The minimum value
 * @param {number} max
 *        The maximum value
 *
 * @return {number}
 *         the clamped number
 */
function clamp(number, min, max) {
  number = Number(number);
  return Math.min(max, Math.max(min, isNaN(number) ? min : number));
}

var Num = /*#__PURE__*/Object.freeze({
  __proto__: null,
  clamp: clamp
});

/**
 * @file slider.js
 */

/**
 * The base functionality for a slider. Can be vertical or horizontal.
 * For instance the volume bar or the seek bar on a video is a slider.
 *
 * @extends Component
 */
class Slider extends Component {
  /**
  * Create an instance of this class
  *
  * @param { import('../player').default } player
  *        The `Player` that this class should be attached to.
  *
  * @param {Object} [options]
  *        The key/value store of player options.
  */
  constructor(player, options) {
    super(player, options);
    this.handleMouseDown_ = e => this.handleMouseDown(e);
    this.handleMouseUp_ = e => this.handleMouseUp(e);
    this.handleKeyDown_ = e => this.handleKeyDown(e);
    this.handleClick_ = e => this.handleClick(e);
    this.handleMouseMove_ = e => this.handleMouseMove(e);
    this.update_ = e => this.update(e);

    // Set property names to bar to match with the child Slider class is looking for
    this.bar = this.getChild(this.options_.barName);

    // Set a horizontal or vertical class on the slider depending on the slider type
    this.vertical(!!this.options_.vertical);
    this.enable();
  }

  /**
   * Are controls are currently enabled for this slider or not.
   *
   * @return {boolean}
   *         true if controls are enabled, false otherwise
   */
  enabled() {
    return this.enabled_;
  }

  /**
   * Enable controls for this slider if they are disabled
   */
  enable() {
    if (this.enabled()) {
      return;
    }
    this.on('mousedown', this.handleMouseDown_);
    this.on('touchstart', this.handleMouseDown_);
    this.on('keydown', this.handleKeyDown_);
    this.on('click', this.handleClick_);

    // TODO: deprecated, controlsvisible does not seem to be fired
    this.on(this.player_, 'controlsvisible', this.update);
    if (this.playerEvent) {
      this.on(this.player_, this.playerEvent, this.update);
    }
    this.removeClass('disabled');
    this.setAttribute('tabindex', 0);
    this.enabled_ = true;
  }

  /**
   * Disable controls for this slider if they are enabled
   */
  disable() {
    if (!this.enabled()) {
      return;
    }
    const doc = this.bar.el_.ownerDocument;
    this.off('mousedown', this.handleMouseDown_);
    this.off('touchstart', this.handleMouseDown_);
    this.off('keydown', this.handleKeyDown_);
    this.off('click', this.handleClick_);
    this.off(this.player_, 'controlsvisible', this.update_);
    this.off(doc, 'mousemove', this.handleMouseMove_);
    this.off(doc, 'mouseup', this.handleMouseUp_);
    this.off(doc, 'touchmove', this.handleMouseMove_);
    this.off(doc, 'touchend', this.handleMouseUp_);
    this.removeAttribute('tabindex');
    this.addClass('disabled');
    if (this.playerEvent) {
      this.off(this.player_, this.playerEvent, this.update);
    }
    this.enabled_ = false;
  }

  /**
   * Create the `Slider`s DOM element.
   *
   * @param {string} type
   *        Type of element to create.
   *
   * @param {Object} [props={}]
   *        List of properties in Object form.
   *
   * @param {Object} [attributes={}]
   *        list of attributes in Object form.
   *
   * @return {Element}
   *         The element that gets created.
   */
  createEl(type, props = {}, attributes = {}) {
    // Add the slider element class to all sub classes
    props.className = props.className + ' vjs-slider';
    props = Object.assign({
      tabIndex: 0
    }, props);
    attributes = Object.assign({
      'role': 'slider',
      'aria-valuenow': 0,
      'aria-valuemin': 0,
      'aria-valuemax': 100
    }, attributes);
    return super.createEl(type, props, attributes);
  }

  /**
   * Handle `mousedown` or `touchstart` events on the `Slider`.
   *
   * @param {MouseEvent} event
   *        `mousedown` or `touchstart` event that triggered this function
   *
   * @listens mousedown
   * @listens touchstart
   * @fires Slider#slideractive
   */
  handleMouseDown(event) {
    const doc = this.bar.el_.ownerDocument;
    if (event.type === 'mousedown') {
      event.preventDefault();
    }
    // Do not call preventDefault() on touchstart in Chrome
    // to avoid console warnings. Use a 'touch-action: none' style
    // instead to prevent unintended scrolling.
    // https://developers.google.com/web/updates/2017/01/scrolling-intervention
    if (event.type === 'touchstart' && !IS_CHROME) {
      event.preventDefault();
    }
    blockTextSelection();
    this.addClass('vjs-sliding');
    /**
     * Triggered when the slider is in an active state
     *
     * @event Slider#slideractive
     * @type {MouseEvent}
     */
    this.trigger('slideractive');
    this.on(doc, 'mousemove', this.handleMouseMove_);
    this.on(doc, 'mouseup', this.handleMouseUp_);
    this.on(doc, 'touchmove', this.handleMouseMove_);
    this.on(doc, 'touchend', this.handleMouseUp_);
    this.handleMouseMove(event, true);
  }

  /**
   * Handle the `mousemove`, `touchmove`, and `mousedown` events on this `Slider`.
   * The `mousemove` and `touchmove` events will only only trigger this function during
   * `mousedown` and `touchstart`. This is due to {@link Slider#handleMouseDown} and
   * {@link Slider#handleMouseUp}.
   *
   * @param {MouseEvent} event
   *        `mousedown`, `mousemove`, `touchstart`, or `touchmove` event that triggered
   *        this function
   * @param {boolean} mouseDown this is a flag that should be set to true if `handleMouseMove` is called directly. It allows us to skip things that should not happen if coming from mouse down but should happen on regular mouse move handler. Defaults to false.
   *
   * @listens mousemove
   * @listens touchmove
   */
  handleMouseMove(event) {}

  /**
   * Handle `mouseup` or `touchend` events on the `Slider`.
   *
   * @param {MouseEvent} event
   *        `mouseup` or `touchend` event that triggered this function.
   *
   * @listens touchend
   * @listens mouseup
   * @fires Slider#sliderinactive
   */
  handleMouseUp(event) {
    const doc = this.bar.el_.ownerDocument;
    unblockTextSelection();
    this.removeClass('vjs-sliding');
    /**
     * Triggered when the slider is no longer in an active state.
     *
     * @event Slider#sliderinactive
     * @type {Event}
     */
    this.trigger('sliderinactive');
    this.off(doc, 'mousemove', this.handleMouseMove_);
    this.off(doc, 'mouseup', this.handleMouseUp_);
    this.off(doc, 'touchmove', this.handleMouseMove_);
    this.off(doc, 'touchend', this.handleMouseUp_);
    this.update();
  }

  /**
   * Update the progress bar of the `Slider`.
   *
   * @return {number}
   *          The percentage of progress the progress bar represents as a
   *          number from 0 to 1.
   */
  update() {
    // In VolumeBar init we have a setTimeout for update that pops and update
    // to the end of the execution stack. The player is destroyed before then
    // update will cause an error
    // If there's no bar...
    if (!this.el_ || !this.bar) {
      return;
    }

    // clamp progress between 0 and 1
    // and only round to four decimal places, as we round to two below
    const progress = this.getProgress();
    if (progress === this.progress_) {
      return progress;
    }
    this.progress_ = progress;
    this.requestNamedAnimationFrame('Slider#update', () => {
      // Set the new bar width or height
      const sizeKey = this.vertical() ? 'height' : 'width';

      // Convert to a percentage for css value
      this.bar.el().style[sizeKey] = (progress * 100).toFixed(2) + '%';
    });
    return progress;
  }

  /**
   * Get the percentage of the bar that should be filled
   * but clamped and rounded.
   *
   * @return {number}
   *         percentage filled that the slider is
   */
  getProgress() {
    return Number(clamp(this.getPercent(), 0, 1).toFixed(4));
  }

  /**
   * Calculate distance for slider
   *
   * @param {Event} event
   *        The event that caused this function to run.
   *
   * @return {number}
   *         The current position of the Slider.
   *         - position.x for vertical `Slider`s
   *         - position.y for horizontal `Slider`s
   */
  calculateDistance(event) {
    const position = getPointerPosition(this.el_, event);
    if (this.vertical()) {
      return position.y;
    }
    return position.x;
  }

  /**
   * Handle a `keydown` event on the `Slider`. Watches for left, right, up, and down
   * arrow keys. This function will only be called when the slider has focus. See
   * {@link Slider#handleFocus} and {@link Slider#handleBlur}.
   *
   * @param {KeyboardEvent} event
   *        the `keydown` event that caused this function to run.
   *
   * @listens keydown
   */
  handleKeyDown(event) {
    // Left and Down Arrows
    if (keycode.isEventKey(event, 'Left') || keycode.isEventKey(event, 'Down')) {
      event.preventDefault();
      event.stopPropagation();
      this.stepBack();

      // Up and Right Arrows
    } else if (keycode.isEventKey(event, 'Right') || keycode.isEventKey(event, 'Up')) {
      event.preventDefault();
      event.stopPropagation();
      this.stepForward();
    } else {
      // Pass keydown handling up for unsupported keys
      super.handleKeyDown(event);
    }
  }

  /**
   * Listener for click events on slider, used to prevent clicks
   *   from bubbling up to parent elements like button menus.
   *
   * @param {Object} event
   *        Event that caused this object to run
   */
  handleClick(event) {
    event.stopPropagation();
    event.preventDefault();
  }

  /**
   * Get/set if slider is horizontal for vertical
   *
   * @param {boolean} [bool]
   *        - true if slider is vertical,
   *        - false is horizontal
   *
   * @return {boolean}
   *         - true if slider is vertical, and getting
   *         - false if the slider is horizontal, and getting
   */
  vertical(bool) {
    if (bool === undefined) {
      return this.vertical_ || false;
    }
    this.vertical_ = !!bool;
    if (this.vertical_) {
      this.addClass('vjs-slider-vertical');
    } else {
      this.addClass('vjs-slider-horizontal');
    }
  }
}
Component.registerComponent('Slider', Slider);

/**
 * @file load-progress-bar.js
 */

// get the percent width of a time compared to the total end
const percentify = (time, end) => clamp(time / end * 100, 0, 100).toFixed(2) + '%';

/**
 * Shows loading progress
 *
 * @extends Component
 */
class LoadProgressBar extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.partEls_ = [];
    this.on(player, 'progress', e => this.update(e));
  }

  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    const el = super.createEl('div', {
      className: 'vjs-load-progress'
    });
    const wrapper = createEl('span', {
      className: 'vjs-control-text'
    });
    const loadedText = createEl('span', {
      textContent: this.localize('Loaded')
    });
    const separator = document.createTextNode(': ');
    this.percentageEl_ = createEl('span', {
      className: 'vjs-control-text-loaded-percentage',
      textContent: '0%'
    });
    el.appendChild(wrapper);
    wrapper.appendChild(loadedText);
    wrapper.appendChild(separator);
    wrapper.appendChild(this.percentageEl_);
    return el;
  }
  dispose() {
    this.partEls_ = null;
    this.percentageEl_ = null;
    super.dispose();
  }

  /**
   * Update progress bar
   *
   * @param {Event} [event]
   *        The `progress` event that caused this function to run.
   *
   * @listens Player#progress
   */
  update(event) {
    this.requestNamedAnimationFrame('LoadProgressBar#update', () => {
      const liveTracker = this.player_.liveTracker;
      const buffered = this.player_.buffered();
      const duration = liveTracker && liveTracker.isLive() ? liveTracker.seekableEnd() : this.player_.duration();
      const bufferedEnd = this.player_.bufferedEnd();
      const children = this.partEls_;
      const percent = percentify(bufferedEnd, duration);
      if (this.percent_ !== percent) {
        // update the width of the progress bar
        this.el_.style.width = percent;
        // update the control-text
        textContent(this.percentageEl_, percent);
        this.percent_ = percent;
      }

      // add child elements to represent the individual buffered time ranges
      for (let i = 0; i < buffered.length; i++) {
        const start = buffered.start(i);
        const end = buffered.end(i);
        let part = children[i];
        if (!part) {
          part = this.el_.appendChild(createEl());
          children[i] = part;
        }

        //  only update if changed
        if (part.dataset.start === start && part.dataset.end === end) {
          continue;
        }
        part.dataset.start = start;
        part.dataset.end = end;

        // set the percent based on the width of the progress bar (bufferedEnd)
        part.style.left = percentify(start, bufferedEnd);
        part.style.width = percentify(end - start, bufferedEnd);
      }

      // remove unused buffered range elements
      for (let i = children.length; i > buffered.length; i--) {
        this.el_.removeChild(children[i - 1]);
      }
      children.length = buffered.length;
    });
  }
}
Component.registerComponent('LoadProgressBar', LoadProgressBar);

/**
 * @file time-tooltip.js
 */

/**
 * Time tooltips display a time above the progress bar.
 *
 * @extends Component
 */
class TimeTooltip extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The {@link Player} that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.update = throttle(bind_(this, this.update), UPDATE_REFRESH_INTERVAL);
  }

  /**
   * Create the time tooltip DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    return super.createEl('div', {
      className: 'vjs-time-tooltip'
    }, {
      'aria-hidden': 'true'
    });
  }

  /**
   * Updates the position of the time tooltip relative to the `SeekBar`.
   *
   * @param {Object} seekBarRect
   *        The `ClientRect` for the {@link SeekBar} element.
   *
   * @param {number} seekBarPoint
   *        A number from 0 to 1, representing a horizontal reference point
   *        from the left edge of the {@link SeekBar}
   */
  update(seekBarRect, seekBarPoint, content) {
    const tooltipRect = findPosition(this.el_);
    const playerRect = getBoundingClientRect(this.player_.el());
    const seekBarPointPx = seekBarRect.width * seekBarPoint;

    // do nothing if either rect isn't available
    // for example, if the player isn't in the DOM for testing
    if (!playerRect || !tooltipRect) {
      return;
    }

    // This is the space left of the `seekBarPoint` available within the bounds
    // of the player. We calculate any gap between the left edge of the player
    // and the left edge of the `SeekBar` and add the number of pixels in the
    // `SeekBar` before hitting the `seekBarPoint`
    const spaceLeftOfPoint = seekBarRect.left - playerRect.left + seekBarPointPx;

    // This is the space right of the `seekBarPoint` available within the bounds
    // of the player. We calculate the number of pixels from the `seekBarPoint`
    // to the right edge of the `SeekBar` and add to that any gap between the
    // right edge of the `SeekBar` and the player.
    const spaceRightOfPoint = seekBarRect.width - seekBarPointPx + (playerRect.right - seekBarRect.right);

    // This is the number of pixels by which the tooltip will need to be pulled
    // further to the right to center it over the `seekBarPoint`.
    let pullTooltipBy = tooltipRect.width / 2;

    // Adjust the `pullTooltipBy` distance to the left or right depending on
    // the results of the space calculations above.
    if (spaceLeftOfPoint < pullTooltipBy) {
      pullTooltipBy += pullTooltipBy - spaceLeftOfPoint;
    } else if (spaceRightOfPoint < pullTooltipBy) {
      pullTooltipBy = spaceRightOfPoint;
    }

    // Due to the imprecision of decimal/ratio based calculations and varying
    // rounding behaviors, there are cases where the spacing adjustment is off
    // by a pixel or two. This adds insurance to these calculations.
    if (pullTooltipBy < 0) {
      pullTooltipBy = 0;
    } else if (pullTooltipBy > tooltipRect.width) {
      pullTooltipBy = tooltipRect.width;
    }

    // prevent small width fluctuations within 0.4px from
    // changing the value below.
    // This really helps for live to prevent the play
    // progress time tooltip from jittering
    pullTooltipBy = Math.round(pullTooltipBy);
    this.el_.style.right = `-${pullTooltipBy}px`;
    this.write(content);
  }

  /**
   * Write the time to the tooltip DOM element.
   *
   * @param {string} content
   *        The formatted time for the tooltip.
   */
  write(content) {
    textContent(this.el_, content);
  }

  /**
   * Updates the position of the time tooltip relative to the `SeekBar`.
   *
   * @param {Object} seekBarRect
   *        The `ClientRect` for the {@link SeekBar} element.
   *
   * @param {number} seekBarPoint
   *        A number from 0 to 1, representing a horizontal reference point
   *        from the left edge of the {@link SeekBar}
   *
   * @param {number} time
   *        The time to update the tooltip to, not used during live playback
   *
   * @param {Function} cb
   *        A function that will be called during the request animation frame
   *        for tooltips that need to do additional animations from the default
   */
  updateTime(seekBarRect, seekBarPoint, time, cb) {
    this.requestNamedAnimationFrame('TimeTooltip#updateTime', () => {
      let content;
      const duration = this.player_.duration();
      if (this.player_.liveTracker && this.player_.liveTracker.isLive()) {
        const liveWindow = this.player_.liveTracker.liveWindow();
        const secondsBehind = liveWindow - seekBarPoint * liveWindow;
        content = (secondsBehind < 1 ? '' : '-') + formatTime(secondsBehind, liveWindow);
      } else {
        content = formatTime(time, duration);
      }
      this.update(seekBarRect, seekBarPoint, content);
      if (cb) {
        cb();
      }
    });
  }
}
Component.registerComponent('TimeTooltip', TimeTooltip);

/**
 * @file play-progress-bar.js
 */

/**
 * Used by {@link SeekBar} to display media playback progress as part of the
 * {@link ProgressControl}.
 *
 * @extends Component
 */
class PlayProgressBar extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The {@link Player} that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.update = throttle(bind_(this, this.update), UPDATE_REFRESH_INTERVAL);
  }

  /**
   * Create the the DOM element for this class.
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    return super.createEl('div', {
      className: 'vjs-play-progress vjs-slider-bar'
    }, {
      'aria-hidden': 'true'
    });
  }

  /**
   * Enqueues updates to its own DOM as well as the DOM of its
   * {@link TimeTooltip} child.
   *
   * @param {Object} seekBarRect
   *        The `ClientRect` for the {@link SeekBar} element.
   *
   * @param {number} seekBarPoint
   *        A number from 0 to 1, representing a horizontal reference point
   *        from the left edge of the {@link SeekBar}
   */
  update(seekBarRect, seekBarPoint) {
    const timeTooltip = this.getChild('timeTooltip');
    if (!timeTooltip) {
      return;
    }
    const time = this.player_.scrubbing() ? this.player_.getCache().currentTime : this.player_.currentTime();
    timeTooltip.updateTime(seekBarRect, seekBarPoint, time);
  }
}

/**
 * Default options for {@link PlayProgressBar}.
 *
 * @type {Object}
 * @private
 */
PlayProgressBar.prototype.options_ = {
  children: []
};

// Time tooltips should not be added to a player on mobile devices
if (!IS_IOS && !IS_ANDROID) {
  PlayProgressBar.prototype.options_.children.push('timeTooltip');
}
Component.registerComponent('PlayProgressBar', PlayProgressBar);

/**
 * @file mouse-time-display.js
 */

/**
 * The {@link MouseTimeDisplay} component tracks mouse movement over the
 * {@link ProgressControl}. It displays an indicator and a {@link TimeTooltip}
 * indicating the time which is represented by a given point in the
 * {@link ProgressControl}.
 *
 * @extends Component
 */
class MouseTimeDisplay extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The {@link Player} that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.update = throttle(bind_(this, this.update), UPDATE_REFRESH_INTERVAL);
  }

  /**
   * Create the DOM element for this class.
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    return super.createEl('div', {
      className: 'vjs-mouse-display'
    });
  }

  /**
   * Enqueues updates to its own DOM as well as the DOM of its
   * {@link TimeTooltip} child.
   *
   * @param {Object} seekBarRect
   *        The `ClientRect` for the {@link SeekBar} element.
   *
   * @param {number} seekBarPoint
   *        A number from 0 to 1, representing a horizontal reference point
   *        from the left edge of the {@link SeekBar}
   */
  update(seekBarRect, seekBarPoint) {
    const time = seekBarPoint * this.player_.duration();
    this.getChild('timeTooltip').updateTime(seekBarRect, seekBarPoint, time, () => {
      this.el_.style.left = `${seekBarRect.width * seekBarPoint}px`;
    });
  }
}

/**
 * Default options for `MouseTimeDisplay`
 *
 * @type {Object}
 * @private
 */
MouseTimeDisplay.prototype.options_ = {
  children: ['timeTooltip']
};
Component.registerComponent('MouseTimeDisplay', MouseTimeDisplay);

/**
 * @file seek-bar.js
 */

// The number of seconds the `step*` functions move the timeline.
const STEP_SECONDS = 5;

// The multiplier of STEP_SECONDS that PgUp/PgDown move the timeline.
const PAGE_KEY_MULTIPLIER = 12;

/**
 * Seek bar and container for the progress bars. Uses {@link PlayProgressBar}
 * as its `bar`.
 *
 * @extends Slider
 */
class SeekBar extends Slider {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.setEventHandlers_();
  }

  /**
   * Sets the event handlers
   *
   * @private
   */
  setEventHandlers_() {
    this.update_ = bind_(this, this.update);
    this.update = throttle(this.update_, UPDATE_REFRESH_INTERVAL);
    this.on(this.player_, ['ended', 'durationchange', 'timeupdate'], this.update);
    if (this.player_.liveTracker) {
      this.on(this.player_.liveTracker, 'liveedgechange', this.update);
    }

    // when playing, let's ensure we smoothly update the play progress bar
    // via an interval
    this.updateInterval = null;
    this.enableIntervalHandler_ = e => this.enableInterval_(e);
    this.disableIntervalHandler_ = e => this.disableInterval_(e);
    this.on(this.player_, ['playing'], this.enableIntervalHandler_);
    this.on(this.player_, ['ended', 'pause', 'waiting'], this.disableIntervalHandler_);

    // we don't need to update the play progress if the document is hidden,
    // also, this causes the CPU to spike and eventually crash the page on IE11.
    if ('hidden' in document && 'visibilityState' in document) {
      this.on(document, 'visibilitychange', this.toggleVisibility_);
    }
  }
  toggleVisibility_(e) {
    if (document.visibilityState === 'hidden') {
      this.cancelNamedAnimationFrame('SeekBar#update');
      this.cancelNamedAnimationFrame('Slider#update');
      this.disableInterval_(e);
    } else {
      if (!this.player_.ended() && !this.player_.paused()) {
        this.enableInterval_();
      }

      // we just switched back to the page and someone may be looking, so, update ASAP
      this.update();
    }
  }
  enableInterval_() {
    if (this.updateInterval) {
      return;
    }
    this.updateInterval = this.setInterval(this.update, UPDATE_REFRESH_INTERVAL);
  }
  disableInterval_(e) {
    if (this.player_.liveTracker && this.player_.liveTracker.isLive() && e && e.type !== 'ended') {
      return;
    }
    if (!this.updateInterval) {
      return;
    }
    this.clearInterval(this.updateInterval);
    this.updateInterval = null;
  }

  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    return super.createEl('div', {
      className: 'vjs-progress-holder'
    }, {
      'aria-label': this.localize('Progress Bar')
    });
  }

  /**
   * This function updates the play progress bar and accessibility
   * attributes to whatever is passed in.
   *
   * @param {Event} [event]
   *        The `timeupdate` or `ended` event that caused this to run.
   *
   * @listens Player#timeupdate
   *
   * @return {number}
   *          The current percent at a number from 0-1
   */
  update(event) {
    // ignore updates while the tab is hidden
    if (document.visibilityState === 'hidden') {
      return;
    }
    const percent = super.update();
    this.requestNamedAnimationFrame('SeekBar#update', () => {
      const currentTime = this.player_.ended() ? this.player_.duration() : this.getCurrentTime_();
      const liveTracker = this.player_.liveTracker;
      let duration = this.player_.duration();
      if (liveTracker && liveTracker.isLive()) {
        duration = this.player_.liveTracker.liveCurrentTime();
      }
      if (this.percent_ !== percent) {
        // machine readable value of progress bar (percentage complete)
        this.el_.setAttribute('aria-valuenow', (percent * 100).toFixed(2));
        this.percent_ = percent;
      }
      if (this.currentTime_ !== currentTime || this.duration_ !== duration) {
        // human readable value of progress bar (time complete)
        this.el_.setAttribute('aria-valuetext', this.localize('progress bar timing: currentTime={1} duration={2}', [formatTime(currentTime, duration), formatTime(duration, duration)], '{1} of {2}'));
        this.currentTime_ = currentTime;
        this.duration_ = duration;
      }

      // update the progress bar time tooltip with the current time
      if (this.bar) {
        this.bar.update(getBoundingClientRect(this.el()), this.getProgress());
      }
    });
    return percent;
  }

  /**
   * Prevent liveThreshold from causing seeks to seem like they
   * are not happening from a user perspective.
   *
   * @param {number} ct
   *        current time to seek to
   */
  userSeek_(ct) {
    if (this.player_.liveTracker && this.player_.liveTracker.isLive()) {
      this.player_.liveTracker.nextSeekedFromUser();
    }
    this.player_.currentTime(ct);
  }

  /**
   * Get the value of current time but allows for smooth scrubbing,
   * when player can't keep up.
   *
   * @return {number}
   *         The current time value to display
   *
   * @private
   */
  getCurrentTime_() {
    return this.player_.scrubbing() ? this.player_.getCache().currentTime : this.player_.currentTime();
  }

  /**
   * Get the percentage of media played so far.
   *
   * @return {number}
   *         The percentage of media played so far (0 to 1).
   */
  getPercent() {
    const currentTime = this.getCurrentTime_();
    let percent;
    const liveTracker = this.player_.liveTracker;
    if (liveTracker && liveTracker.isLive()) {
      percent = (currentTime - liveTracker.seekableStart()) / liveTracker.liveWindow();

      // prevent the percent from changing at the live edge
      if (liveTracker.atLiveEdge()) {
        percent = 1;
      }
    } else {
      percent = currentTime / this.player_.duration();
    }
    return percent;
  }

  /**
   * Handle mouse down on seek bar
   *
   * @param {MouseEvent} event
   *        The `mousedown` event that caused this to run.
   *
   * @listens mousedown
   */
  handleMouseDown(event) {
    if (!isSingleLeftClick(event)) {
      return;
    }

    // Stop event propagation to prevent double fire in progress-control.js
    event.stopPropagation();
    this.videoWasPlaying = !this.player_.paused();
    this.player_.pause();
    super.handleMouseDown(event);
  }

  /**
   * Handle mouse move on seek bar
   *
   * @param {MouseEvent} event
   *        The `mousemove` event that caused this to run.
   * @param {boolean} mouseDown this is a flag that should be set to true if `handleMouseMove` is called directly. It allows us to skip things that should not happen if coming from mouse down but should happen on regular mouse move handler. Defaults to false
   *
   * @listens mousemove
   */
  handleMouseMove(event, mouseDown = false) {
    if (!isSingleLeftClick(event)) {
      return;
    }
    if (!mouseDown && !this.player_.scrubbing()) {
      this.player_.scrubbing(true);
    }
    let newTime;
    const distance = this.calculateDistance(event);
    const liveTracker = this.player_.liveTracker;
    if (!liveTracker || !liveTracker.isLive()) {
      newTime = distance * this.player_.duration();

      // Don't let video end while scrubbing.
      if (newTime === this.player_.duration()) {
        newTime = newTime - 0.1;
      }
    } else {
      if (distance >= 0.99) {
        liveTracker.seekToLiveEdge();
        return;
      }
      const seekableStart = liveTracker.seekableStart();
      const seekableEnd = liveTracker.liveCurrentTime();
      newTime = seekableStart + distance * liveTracker.liveWindow();

      // Don't let video end while scrubbing.
      if (newTime >= seekableEnd) {
        newTime = seekableEnd;
      }

      // Compensate for precision differences so that currentTime is not less
      // than seekable start
      if (newTime <= seekableStart) {
        newTime = seekableStart + 0.1;
      }

      // On android seekableEnd can be Infinity sometimes,
      // this will cause newTime to be Infinity, which is
      // not a valid currentTime.
      if (newTime === Infinity) {
        return;
      }
    }

    // Set new time (tell player to seek to new time)
    this.userSeek_(newTime);
  }
  enable() {
    super.enable();
    const mouseTimeDisplay = this.getChild('mouseTimeDisplay');
    if (!mouseTimeDisplay) {
      return;
    }
    mouseTimeDisplay.show();
  }
  disable() {
    super.disable();
    const mouseTimeDisplay = this.getChild('mouseTimeDisplay');
    if (!mouseTimeDisplay) {
      return;
    }
    mouseTimeDisplay.hide();
  }

  /**
   * Handle mouse up on seek bar
   *
   * @param {MouseEvent} event
   *        The `mouseup` event that caused this to run.
   *
   * @listens mouseup
   */
  handleMouseUp(event) {
    super.handleMouseUp(event);

    // Stop event propagation to prevent double fire in progress-control.js
    if (event) {
      event.stopPropagation();
    }
    this.player_.scrubbing(false);

    /**
     * Trigger timeupdate because we're done seeking and the time has changed.
     * This is particularly useful for if the player is paused to time the time displays.
     *
     * @event Tech#timeupdate
     * @type {Event}
     */
    this.player_.trigger({
      type: 'timeupdate',
      target: this,
      manuallyTriggered: true
    });
    if (this.videoWasPlaying) {
      silencePromise(this.player_.play());
    } else {
      // We're done seeking and the time has changed.
      // If the player is paused, make sure we display the correct time on the seek bar.
      this.update_();
    }
  }

  /**
   * Move more quickly fast forward for keyboard-only users
   */
  stepForward() {
    this.userSeek_(this.player_.currentTime() + STEP_SECONDS);
  }

  /**
   * Move more quickly rewind for keyboard-only users
   */
  stepBack() {
    this.userSeek_(this.player_.currentTime() - STEP_SECONDS);
  }

  /**
   * Toggles the playback state of the player
   * This gets called when enter or space is used on the seekbar
   *
   * @param {KeyboardEvent} event
   *        The `keydown` event that caused this function to be called
   *
   */
  handleAction(event) {
    if (this.player_.paused()) {
      this.player_.play();
    } else {
      this.player_.pause();
    }
  }

  /**
   * Called when this SeekBar has focus and a key gets pressed down.
   * Supports the following keys:
   *
   *   Space or Enter key fire a click event
   *   Home key moves to start of the timeline
   *   End key moves to end of the timeline
   *   Digit "0" through "9" keys move to 0%, 10% ... 80%, 90% of the timeline
   *   PageDown key moves back a larger step than ArrowDown
   *   PageUp key moves forward a large step
   *
   * @param {KeyboardEvent} event
   *        The `keydown` event that caused this function to be called.
   *
   * @listens keydown
   */
  handleKeyDown(event) {
    const liveTracker = this.player_.liveTracker;
    if (keycode.isEventKey(event, 'Space') || keycode.isEventKey(event, 'Enter')) {
      event.preventDefault();
      event.stopPropagation();
      this.handleAction(event);
    } else if (keycode.isEventKey(event, 'Home')) {
      event.preventDefault();
      event.stopPropagation();
      this.userSeek_(0);
    } else if (keycode.isEventKey(event, 'End')) {
      event.preventDefault();
      event.stopPropagation();
      if (liveTracker && liveTracker.isLive()) {
        this.userSeek_(liveTracker.liveCurrentTime());
      } else {
        this.userSeek_(this.player_.duration());
      }
    } else if (/^[0-9]$/.test(keycode(event))) {
      event.preventDefault();
      event.stopPropagation();
      const gotoFraction = (keycode.codes[keycode(event)] - keycode.codes['0']) * 10.0 / 100.0;
      if (liveTracker && liveTracker.isLive()) {
        this.userSeek_(liveTracker.seekableStart() + liveTracker.liveWindow() * gotoFraction);
      } else {
        this.userSeek_(this.player_.duration() * gotoFraction);
      }
    } else if (keycode.isEventKey(event, 'PgDn')) {
      event.preventDefault();
      event.stopPropagation();
      this.userSeek_(this.player_.currentTime() - STEP_SECONDS * PAGE_KEY_MULTIPLIER);
    } else if (keycode.isEventKey(event, 'PgUp')) {
      event.preventDefault();
      event.stopPropagation();
      this.userSeek_(this.player_.currentTime() + STEP_SECONDS * PAGE_KEY_MULTIPLIER);
    } else {
      // Pass keydown handling up for unsupported keys
      super.handleKeyDown(event);
    }
  }
  dispose() {
    this.disableInterval_();
    this.off(this.player_, ['ended', 'durationchange', 'timeupdate'], this.update);
    if (this.player_.liveTracker) {
      this.off(this.player_.liveTracker, 'liveedgechange', this.update);
    }
    this.off(this.player_, ['playing'], this.enableIntervalHandler_);
    this.off(this.player_, ['ended', 'pause', 'waiting'], this.disableIntervalHandler_);

    // we don't need to update the play progress if the document is hidden,
    // also, this causes the CPU to spike and eventually crash the page on IE11.
    if ('hidden' in document && 'visibilityState' in document) {
      this.off(document, 'visibilitychange', this.toggleVisibility_);
    }
    super.dispose();
  }
}

/**
 * Default options for the `SeekBar`
 *
 * @type {Object}
 * @private
 */
SeekBar.prototype.options_ = {
  children: ['loadProgressBar', 'playProgressBar'],
  barName: 'playProgressBar'
};

// MouseTimeDisplay tooltips should not be added to a player on mobile devices
if (!IS_IOS && !IS_ANDROID) {
  SeekBar.prototype.options_.children.splice(1, 0, 'mouseTimeDisplay');
}
Component.registerComponent('SeekBar', SeekBar);

/**
 * @file progress-control.js
 */

/**
 * The Progress Control component contains the seek bar, load progress,
 * and play progress.
 *
 * @extends Component
 */
class ProgressControl extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.handleMouseMove = throttle(bind_(this, this.handleMouseMove), UPDATE_REFRESH_INTERVAL);
    this.throttledHandleMouseSeek = throttle(bind_(this, this.handleMouseSeek), UPDATE_REFRESH_INTERVAL);
    this.handleMouseUpHandler_ = e => this.handleMouseUp(e);
    this.handleMouseDownHandler_ = e => this.handleMouseDown(e);
    this.enable();
  }

  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    return super.createEl('div', {
      className: 'vjs-progress-control vjs-control'
    });
  }

  /**
   * When the mouse moves over the `ProgressControl`, the pointer position
   * gets passed down to the `MouseTimeDisplay` component.
   *
   * @param {Event} event
   *        The `mousemove` event that caused this function to run.
   *
   * @listen mousemove
   */
  handleMouseMove(event) {
    const seekBar = this.getChild('seekBar');
    if (!seekBar) {
      return;
    }
    const playProgressBar = seekBar.getChild('playProgressBar');
    const mouseTimeDisplay = seekBar.getChild('mouseTimeDisplay');
    if (!playProgressBar && !mouseTimeDisplay) {
      return;
    }
    const seekBarEl = seekBar.el();
    const seekBarRect = findPosition(seekBarEl);
    let seekBarPoint = getPointerPosition(seekBarEl, event).x;

    // The default skin has a gap on either side of the `SeekBar`. This means
    // that it's possible to trigger this behavior outside the boundaries of
    // the `SeekBar`. This ensures we stay within it at all times.
    seekBarPoint = clamp(seekBarPoint, 0, 1);
    if (mouseTimeDisplay) {
      mouseTimeDisplay.update(seekBarRect, seekBarPoint);
    }
    if (playProgressBar) {
      playProgressBar.update(seekBarRect, seekBar.getProgress());
    }
  }

  /**
   * A throttled version of the {@link ProgressControl#handleMouseSeek} listener.
   *
   * @method ProgressControl#throttledHandleMouseSeek
   * @param {Event} event
   *        The `mousemove` event that caused this function to run.
   *
   * @listen mousemove
   * @listen touchmove
   */

  /**
   * Handle `mousemove` or `touchmove` events on the `ProgressControl`.
   *
   * @param {Event} event
   *        `mousedown` or `touchstart` event that triggered this function
   *
   * @listens mousemove
   * @listens touchmove
   */
  handleMouseSeek(event) {
    const seekBar = this.getChild('seekBar');
    if (seekBar) {
      seekBar.handleMouseMove(event);
    }
  }

  /**
   * Are controls are currently enabled for this progress control.
   *
   * @return {boolean}
   *         true if controls are enabled, false otherwise
   */
  enabled() {
    return this.enabled_;
  }

  /**
   * Disable all controls on the progress control and its children
   */
  disable() {
    this.children().forEach(child => child.disable && child.disable());
    if (!this.enabled()) {
      return;
    }
    this.off(['mousedown', 'touchstart'], this.handleMouseDownHandler_);
    this.off(this.el_, 'mousemove', this.handleMouseMove);
    this.removeListenersAddedOnMousedownAndTouchstart();
    this.addClass('disabled');
    this.enabled_ = false;

    // Restore normal playback state if controls are disabled while scrubbing
    if (this.player_.scrubbing()) {
      const seekBar = this.getChild('seekBar');
      this.player_.scrubbing(false);
      if (seekBar.videoWasPlaying) {
        silencePromise(this.player_.play());
      }
    }
  }

  /**
   * Enable all controls on the progress control and its children
   */
  enable() {
    this.children().forEach(child => child.enable && child.enable());
    if (this.enabled()) {
      return;
    }
    this.on(['mousedown', 'touchstart'], this.handleMouseDownHandler_);
    this.on(this.el_, 'mousemove', this.handleMouseMove);
    this.removeClass('disabled');
    this.enabled_ = true;
  }

  /**
   * Cleanup listeners after the user finishes interacting with the progress controls
   */
  removeListenersAddedOnMousedownAndTouchstart() {
    const doc = this.el_.ownerDocument;
    this.off(doc, 'mousemove', this.throttledHandleMouseSeek);
    this.off(doc, 'touchmove', this.throttledHandleMouseSeek);
    this.off(doc, 'mouseup', this.handleMouseUpHandler_);
    this.off(doc, 'touchend', this.handleMouseUpHandler_);
  }

  /**
   * Handle `mousedown` or `touchstart` events on the `ProgressControl`.
   *
   * @param {Event} event
   *        `mousedown` or `touchstart` event that triggered this function
   *
   * @listens mousedown
   * @listens touchstart
   */
  handleMouseDown(event) {
    const doc = this.el_.ownerDocument;
    const seekBar = this.getChild('seekBar');
    if (seekBar) {
      seekBar.handleMouseDown(event);
    }
    this.on(doc, 'mousemove', this.throttledHandleMouseSeek);
    this.on(doc, 'touchmove', this.throttledHandleMouseSeek);
    this.on(doc, 'mouseup', this.handleMouseUpHandler_);
    this.on(doc, 'touchend', this.handleMouseUpHandler_);
  }

  /**
   * Handle `mouseup` or `touchend` events on the `ProgressControl`.
   *
   * @param {Event} event
   *        `mouseup` or `touchend` event that triggered this function.
   *
   * @listens touchend
   * @listens mouseup
   */
  handleMouseUp(event) {
    const seekBar = this.getChild('seekBar');
    if (seekBar) {
      seekBar.handleMouseUp(event);
    }
    this.removeListenersAddedOnMousedownAndTouchstart();
  }
}

/**
 * Default options for `ProgressControl`
 *
 * @type {Object}
 * @private
 */
ProgressControl.prototype.options_ = {
  children: ['seekBar']
};
Component.registerComponent('ProgressControl', ProgressControl);

/**
 * @file picture-in-picture-toggle.js
 */

/**
 * Toggle Picture-in-Picture mode
 *
 * @extends Button
 */
class PictureInPictureToggle extends Button {
  /**
   * Creates an instance of this class.
   *
   * @param { import('./player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   *
   * @listens Player#enterpictureinpicture
   * @listens Player#leavepictureinpicture
   */
  constructor(player, options) {
    super(player, options);
    this.on(player, ['enterpictureinpicture', 'leavepictureinpicture'], e => this.handlePictureInPictureChange(e));
    this.on(player, ['disablepictureinpicturechanged', 'loadedmetadata'], e => this.handlePictureInPictureEnabledChange(e));
    this.on(player, ['loadedmetadata', 'audioonlymodechange', 'audiopostermodechange'], () => {
      // This audio detection will not detect HLS or DASH audio-only streams because there was no reliable way to detect them at the time
      const isSourceAudio = player.currentType().substring(0, 5) === 'audio';
      if (isSourceAudio || player.audioPosterMode() || player.audioOnlyMode()) {
        if (player.isInPictureInPicture()) {
          player.exitPictureInPicture();
        }
        this.hide();
      } else {
        this.show();
      }
    });

    // TODO: Deactivate button on player emptied event.
    this.disable();
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `vjs-picture-in-picture-control ${super.buildCSSClass()}`;
  }

  /**
   * Enables or disables button based on availability of a Picture-In-Picture mode.
   *
   * Enabled if
   * - `player.options().enableDocumentPictureInPicture` is true and
   *   window.documentPictureInPicture is available; or
   * - `player.disablePictureInPicture()` is false and
   *   element.requestPictureInPicture is available
   */
  handlePictureInPictureEnabledChange() {
    if (document.pictureInPictureEnabled && this.player_.disablePictureInPicture() === false || this.player_.options_.enableDocumentPictureInPicture && 'documentPictureInPicture' in window) {
      this.enable();
    } else {
      this.disable();
    }
  }

  /**
   * Handles enterpictureinpicture and leavepictureinpicture on the player and change control text accordingly.
   *
   * @param {Event} [event]
   *        The {@link Player#enterpictureinpicture} or {@link Player#leavepictureinpicture} event that caused this function to be
   *        called.
   *
   * @listens Player#enterpictureinpicture
   * @listens Player#leavepictureinpicture
   */
  handlePictureInPictureChange(event) {
    if (this.player_.isInPictureInPicture()) {
      this.controlText('Exit Picture-in-Picture');
    } else {
      this.controlText('Picture-in-Picture');
    }
    this.handlePictureInPictureEnabledChange();
  }

  /**
   * This gets called when an `PictureInPictureToggle` is "clicked". See
   * {@link ClickableComponent} for more detailed information on what a click can be.
   *
   * @param {Event} [event]
   *        The `keydown`, `tap`, or `click` event that caused this function to be
   *        called.
   *
   * @listens tap
   * @listens click
   */
  handleClick(event) {
    if (!this.player_.isInPictureInPicture()) {
      this.player_.requestPictureInPicture();
    } else {
      this.player_.exitPictureInPicture();
    }
  }
}

/**
 * The text that should display over the `PictureInPictureToggle`s controls. Added for localization.
 *
 * @type {string}
 * @protected
 */
PictureInPictureToggle.prototype.controlText_ = 'Picture-in-Picture';
Component.registerComponent('PictureInPictureToggle', PictureInPictureToggle);

/**
 * @file fullscreen-toggle.js
 */

/**
 * Toggle fullscreen video
 *
 * @extends Button
 */
class FullscreenToggle extends Button {
  /**
   * Creates an instance of this class.
   *
   * @param { import('./player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.on(player, 'fullscreenchange', e => this.handleFullscreenChange(e));
    if (document[player.fsApi_.fullscreenEnabled] === false) {
      this.disable();
    }
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `vjs-fullscreen-control ${super.buildCSSClass()}`;
  }

  /**
   * Handles fullscreenchange on the player and change control text accordingly.
   *
   * @param {Event} [event]
   *        The {@link Player#fullscreenchange} event that caused this function to be
   *        called.
   *
   * @listens Player#fullscreenchange
   */
  handleFullscreenChange(event) {
    if (this.player_.isFullscreen()) {
      this.controlText('Exit Fullscreen');
    } else {
      this.controlText('Fullscreen');
    }
  }

  /**
   * This gets called when an `FullscreenToggle` is "clicked". See
   * {@link ClickableComponent} for more detailed information on what a click can be.
   *
   * @param {Event} [event]
   *        The `keydown`, `tap`, or `click` event that caused this function to be
   *        called.
   *
   * @listens tap
   * @listens click
   */
  handleClick(event) {
    if (!this.player_.isFullscreen()) {
      this.player_.requestFullscreen();
    } else {
      this.player_.exitFullscreen();
    }
  }
}

/**
 * The text that should display over the `FullscreenToggle`s controls. Added for localization.
 *
 * @type {string}
 * @protected
 */
FullscreenToggle.prototype.controlText_ = 'Fullscreen';
Component.registerComponent('FullscreenToggle', FullscreenToggle);

/**
 * Check if volume control is supported and if it isn't hide the
 * `Component` that was passed  using the `vjs-hidden` class.
 *
 * @param { import('../../component').default } self
 *        The component that should be hidden if volume is unsupported
 *
 * @param { import('../../player').default } player
 *        A reference to the player
 *
 * @private
 */
const checkVolumeSupport = function (self, player) {
  // hide volume controls when they're not supported by the current tech
  if (player.tech_ && !player.tech_.featuresVolumeControl) {
    self.addClass('vjs-hidden');
  }
  self.on(player, 'loadstart', function () {
    if (!player.tech_.featuresVolumeControl) {
      self.addClass('vjs-hidden');
    } else {
      self.removeClass('vjs-hidden');
    }
  });
};

/**
 * @file volume-level.js
 */

/**
 * Shows volume level
 *
 * @extends Component
 */
class VolumeLevel extends Component {
  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    const el = super.createEl('div', {
      className: 'vjs-volume-level'
    });
    el.appendChild(super.createEl('span', {
      className: 'vjs-control-text'
    }));
    return el;
  }
}
Component.registerComponent('VolumeLevel', VolumeLevel);

/**
 * @file volume-level-tooltip.js
 */

/**
 * Volume level tooltips display a volume above or side by side the volume bar.
 *
 * @extends Component
 */
class VolumeLevelTooltip extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The {@link Player} that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.update = throttle(bind_(this, this.update), UPDATE_REFRESH_INTERVAL);
  }

  /**
   * Create the volume tooltip DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    return super.createEl('div', {
      className: 'vjs-volume-tooltip'
    }, {
      'aria-hidden': 'true'
    });
  }

  /**
   * Updates the position of the tooltip relative to the `VolumeBar` and
   * its content text.
   *
   * @param {Object} rangeBarRect
   *        The `ClientRect` for the {@link VolumeBar} element.
   *
   * @param {number} rangeBarPoint
   *        A number from 0 to 1, representing a horizontal/vertical reference point
   *        from the left edge of the {@link VolumeBar}
   *
   * @param {boolean} vertical
   *        Referees to the Volume control position
   *        in the control bar{@link VolumeControl}
   *
   */
  update(rangeBarRect, rangeBarPoint, vertical, content) {
    if (!vertical) {
      const tooltipRect = getBoundingClientRect(this.el_);
      const playerRect = getBoundingClientRect(this.player_.el());
      const volumeBarPointPx = rangeBarRect.width * rangeBarPoint;
      if (!playerRect || !tooltipRect) {
        return;
      }
      const spaceLeftOfPoint = rangeBarRect.left - playerRect.left + volumeBarPointPx;
      const spaceRightOfPoint = rangeBarRect.width - volumeBarPointPx + (playerRect.right - rangeBarRect.right);
      let pullTooltipBy = tooltipRect.width / 2;
      if (spaceLeftOfPoint < pullTooltipBy) {
        pullTooltipBy += pullTooltipBy - spaceLeftOfPoint;
      } else if (spaceRightOfPoint < pullTooltipBy) {
        pullTooltipBy = spaceRightOfPoint;
      }
      if (pullTooltipBy < 0) {
        pullTooltipBy = 0;
      } else if (pullTooltipBy > tooltipRect.width) {
        pullTooltipBy = tooltipRect.width;
      }
      this.el_.style.right = `-${pullTooltipBy}px`;
    }
    this.write(`${content}%`);
  }

  /**
   * Write the volume to the tooltip DOM element.
   *
   * @param {string} content
   *        The formatted volume for the tooltip.
   */
  write(content) {
    textContent(this.el_, content);
  }

  /**
   * Updates the position of the volume tooltip relative to the `VolumeBar`.
   *
   * @param {Object} rangeBarRect
   *        The `ClientRect` for the {@link VolumeBar} element.
   *
   * @param {number} rangeBarPoint
   *        A number from 0 to 1, representing a horizontal/vertical reference point
   *        from the left edge of the {@link VolumeBar}
   *
   * @param {boolean} vertical
   *        Referees to the Volume control position
   *        in the control bar{@link VolumeControl}
   *
   * @param {number} volume
   *        The volume level to update the tooltip to
   *
   * @param {Function} cb
   *        A function that will be called during the request animation frame
   *        for tooltips that need to do additional animations from the default
   */
  updateVolume(rangeBarRect, rangeBarPoint, vertical, volume, cb) {
    this.requestNamedAnimationFrame('VolumeLevelTooltip#updateVolume', () => {
      this.update(rangeBarRect, rangeBarPoint, vertical, volume.toFixed(0));
      if (cb) {
        cb();
      }
    });
  }
}
Component.registerComponent('VolumeLevelTooltip', VolumeLevelTooltip);

/**
 * @file mouse-volume-level-display.js
 */

/**
 * The {@link MouseVolumeLevelDisplay} component tracks mouse movement over the
 * {@link VolumeControl}. It displays an indicator and a {@link VolumeLevelTooltip}
 * indicating the volume level which is represented by a given point in the
 * {@link VolumeBar}.
 *
 * @extends Component
 */
class MouseVolumeLevelDisplay extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The {@link Player} that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.update = throttle(bind_(this, this.update), UPDATE_REFRESH_INTERVAL);
  }

  /**
   * Create the DOM element for this class.
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    return super.createEl('div', {
      className: 'vjs-mouse-display'
    });
  }

  /**
   * Enquires updates to its own DOM as well as the DOM of its
   * {@link VolumeLevelTooltip} child.
   *
   * @param {Object} rangeBarRect
   *        The `ClientRect` for the {@link VolumeBar} element.
   *
   * @param {number} rangeBarPoint
   *        A number from 0 to 1, representing a horizontal/vertical reference point
   *        from the left edge of the {@link VolumeBar}
   *
   * @param {boolean} vertical
   *        Referees to the Volume control position
   *        in the control bar{@link VolumeControl}
   *
   */
  update(rangeBarRect, rangeBarPoint, vertical) {
    const volume = 100 * rangeBarPoint;
    this.getChild('volumeLevelTooltip').updateVolume(rangeBarRect, rangeBarPoint, vertical, volume, () => {
      if (vertical) {
        this.el_.style.bottom = `${rangeBarRect.height * rangeBarPoint}px`;
      } else {
        this.el_.style.left = `${rangeBarRect.width * rangeBarPoint}px`;
      }
    });
  }
}

/**
 * Default options for `MouseVolumeLevelDisplay`
 *
 * @type {Object}
 * @private
 */
MouseVolumeLevelDisplay.prototype.options_ = {
  children: ['volumeLevelTooltip']
};
Component.registerComponent('MouseVolumeLevelDisplay', MouseVolumeLevelDisplay);

/**
 * @file volume-bar.js
 */

/**
 * The bar that contains the volume level and can be clicked on to adjust the level
 *
 * @extends Slider
 */
class VolumeBar extends Slider {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.on('slideractive', e => this.updateLastVolume_(e));
    this.on(player, 'volumechange', e => this.updateARIAAttributes(e));
    player.ready(() => this.updateARIAAttributes());
  }

  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    return super.createEl('div', {
      className: 'vjs-volume-bar vjs-slider-bar'
    }, {
      'aria-label': this.localize('Volume Level'),
      'aria-live': 'polite'
    });
  }

  /**
   * Handle mouse down on volume bar
   *
   * @param {Event} event
   *        The `mousedown` event that caused this to run.
   *
   * @listens mousedown
   */
  handleMouseDown(event) {
    if (!isSingleLeftClick(event)) {
      return;
    }
    super.handleMouseDown(event);
  }

  /**
   * Handle movement events on the {@link VolumeMenuButton}.
   *
   * @param {Event} event
   *        The event that caused this function to run.
   *
   * @listens mousemove
   */
  handleMouseMove(event) {
    const mouseVolumeLevelDisplay = this.getChild('mouseVolumeLevelDisplay');
    if (mouseVolumeLevelDisplay) {
      const volumeBarEl = this.el();
      const volumeBarRect = getBoundingClientRect(volumeBarEl);
      const vertical = this.vertical();
      let volumeBarPoint = getPointerPosition(volumeBarEl, event);
      volumeBarPoint = vertical ? volumeBarPoint.y : volumeBarPoint.x;
      // The default skin has a gap on either side of the `VolumeBar`. This means
      // that it's possible to trigger this behavior outside the boundaries of
      // the `VolumeBar`. This ensures we stay within it at all times.
      volumeBarPoint = clamp(volumeBarPoint, 0, 1);
      mouseVolumeLevelDisplay.update(volumeBarRect, volumeBarPoint, vertical);
    }
    if (!isSingleLeftClick(event)) {
      return;
    }
    this.checkMuted();
    this.player_.volume(this.calculateDistance(event));
  }

  /**
   * If the player is muted unmute it.
   */
  checkMuted() {
    if (this.player_.muted()) {
      this.player_.muted(false);
    }
  }

  /**
   * Get percent of volume level
   *
   * @return {number}
   *         Volume level percent as a decimal number.
   */
  getPercent() {
    if (this.player_.muted()) {
      return 0;
    }
    return this.player_.volume();
  }

  /**
   * Increase volume level for keyboard users
   */
  stepForward() {
    this.checkMuted();
    this.player_.volume(this.player_.volume() + 0.1);
  }

  /**
   * Decrease volume level for keyboard users
   */
  stepBack() {
    this.checkMuted();
    this.player_.volume(this.player_.volume() - 0.1);
  }

  /**
   * Update ARIA accessibility attributes
   *
   * @param {Event} [event]
   *        The `volumechange` event that caused this function to run.
   *
   * @listens Player#volumechange
   */
  updateARIAAttributes(event) {
    const ariaValue = this.player_.muted() ? 0 : this.volumeAsPercentage_();
    this.el_.setAttribute('aria-valuenow', ariaValue);
    this.el_.setAttribute('aria-valuetext', ariaValue + '%');
  }

  /**
   * Returns the current value of the player volume as a percentage
   *
   * @private
   */
  volumeAsPercentage_() {
    return Math.round(this.player_.volume() * 100);
  }

  /**
   * When user starts dragging the VolumeBar, store the volume and listen for
   * the end of the drag. When the drag ends, if the volume was set to zero,
   * set lastVolume to the stored volume.
   *
   * @listens slideractive
   * @private
   */
  updateLastVolume_() {
    const volumeBeforeDrag = this.player_.volume();
    this.one('sliderinactive', () => {
      if (this.player_.volume() === 0) {
        this.player_.lastVolume_(volumeBeforeDrag);
      }
    });
  }
}

/**
 * Default options for the `VolumeBar`
 *
 * @type {Object}
 * @private
 */
VolumeBar.prototype.options_ = {
  children: ['volumeLevel'],
  barName: 'volumeLevel'
};

// MouseVolumeLevelDisplay tooltip should not be added to a player on mobile devices
if (!IS_IOS && !IS_ANDROID) {
  VolumeBar.prototype.options_.children.splice(0, 0, 'mouseVolumeLevelDisplay');
}

/**
 * Call the update event for this Slider when this event happens on the player.
 *
 * @type {string}
 */
VolumeBar.prototype.playerEvent = 'volumechange';
Component.registerComponent('VolumeBar', VolumeBar);

/**
 * @file volume-control.js
 */

/**
 * The component for controlling the volume level
 *
 * @extends Component
 */
class VolumeControl extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options={}]
   *        The key/value store of player options.
   */
  constructor(player, options = {}) {
    options.vertical = options.vertical || false;

    // Pass the vertical option down to the VolumeBar if
    // the VolumeBar is turned on.
    if (typeof options.volumeBar === 'undefined' || isPlain(options.volumeBar)) {
      options.volumeBar = options.volumeBar || {};
      options.volumeBar.vertical = options.vertical;
    }
    super(player, options);

    // hide this control if volume support is missing
    checkVolumeSupport(this, player);
    this.throttledHandleMouseMove = throttle(bind_(this, this.handleMouseMove), UPDATE_REFRESH_INTERVAL);
    this.handleMouseUpHandler_ = e => this.handleMouseUp(e);
    this.on('mousedown', e => this.handleMouseDown(e));
    this.on('touchstart', e => this.handleMouseDown(e));
    this.on('mousemove', e => this.handleMouseMove(e));

    // while the slider is active (the mouse has been pressed down and
    // is dragging) or in focus we do not want to hide the VolumeBar
    this.on(this.volumeBar, ['focus', 'slideractive'], () => {
      this.volumeBar.addClass('vjs-slider-active');
      this.addClass('vjs-slider-active');
      this.trigger('slideractive');
    });
    this.on(this.volumeBar, ['blur', 'sliderinactive'], () => {
      this.volumeBar.removeClass('vjs-slider-active');
      this.removeClass('vjs-slider-active');
      this.trigger('sliderinactive');
    });
  }

  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    let orientationClass = 'vjs-volume-horizontal';
    if (this.options_.vertical) {
      orientationClass = 'vjs-volume-vertical';
    }
    return super.createEl('div', {
      className: `vjs-volume-control vjs-control ${orientationClass}`
    });
  }

  /**
   * Handle `mousedown` or `touchstart` events on the `VolumeControl`.
   *
   * @param {Event} event
   *        `mousedown` or `touchstart` event that triggered this function
   *
   * @listens mousedown
   * @listens touchstart
   */
  handleMouseDown(event) {
    const doc = this.el_.ownerDocument;
    this.on(doc, 'mousemove', this.throttledHandleMouseMove);
    this.on(doc, 'touchmove', this.throttledHandleMouseMove);
    this.on(doc, 'mouseup', this.handleMouseUpHandler_);
    this.on(doc, 'touchend', this.handleMouseUpHandler_);
  }

  /**
   * Handle `mouseup` or `touchend` events on the `VolumeControl`.
   *
   * @param {Event} event
   *        `mouseup` or `touchend` event that triggered this function.
   *
   * @listens touchend
   * @listens mouseup
   */
  handleMouseUp(event) {
    const doc = this.el_.ownerDocument;
    this.off(doc, 'mousemove', this.throttledHandleMouseMove);
    this.off(doc, 'touchmove', this.throttledHandleMouseMove);
    this.off(doc, 'mouseup', this.handleMouseUpHandler_);
    this.off(doc, 'touchend', this.handleMouseUpHandler_);
  }

  /**
   * Handle `mousedown` or `touchstart` events on the `VolumeControl`.
   *
   * @param {Event} event
   *        `mousedown` or `touchstart` event that triggered this function
   *
   * @listens mousedown
   * @listens touchstart
   */
  handleMouseMove(event) {
    this.volumeBar.handleMouseMove(event);
  }
}

/**
 * Default options for the `VolumeControl`
 *
 * @type {Object}
 * @private
 */
VolumeControl.prototype.options_ = {
  children: ['volumeBar']
};
Component.registerComponent('VolumeControl', VolumeControl);

/**
 * Check if muting volume is supported and if it isn't hide the mute toggle
 * button.
 *
 * @param { import('../../component').default } self
 *        A reference to the mute toggle button
 *
 * @param { import('../../player').default } player
 *        A reference to the player
 *
 * @private
 */
const checkMuteSupport = function (self, player) {
  // hide mute toggle button if it's not supported by the current tech
  if (player.tech_ && !player.tech_.featuresMuteControl) {
    self.addClass('vjs-hidden');
  }
  self.on(player, 'loadstart', function () {
    if (!player.tech_.featuresMuteControl) {
      self.addClass('vjs-hidden');
    } else {
      self.removeClass('vjs-hidden');
    }
  });
};

/**
 * @file mute-toggle.js
 */

/**
 * A button component for muting the audio.
 *
 * @extends Button
 */
class MuteToggle extends Button {
  /**
   * Creates an instance of this class.
   *
   * @param { import('./player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);

    // hide this control if volume support is missing
    checkMuteSupport(this, player);
    this.on(player, ['loadstart', 'volumechange'], e => this.update(e));
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `vjs-mute-control ${super.buildCSSClass()}`;
  }

  /**
   * This gets called when an `MuteToggle` is "clicked". See
   * {@link ClickableComponent} for more detailed information on what a click can be.
   *
   * @param {Event} [event]
   *        The `keydown`, `tap`, or `click` event that caused this function to be
   *        called.
   *
   * @listens tap
   * @listens click
   */
  handleClick(event) {
    const vol = this.player_.volume();
    const lastVolume = this.player_.lastVolume_();
    if (vol === 0) {
      const volumeToSet = lastVolume < 0.1 ? 0.1 : lastVolume;
      this.player_.volume(volumeToSet);
      this.player_.muted(false);
    } else {
      this.player_.muted(this.player_.muted() ? false : true);
    }
  }

  /**
   * Update the `MuteToggle` button based on the state of `volume` and `muted`
   * on the player.
   *
   * @param {Event} [event]
   *        The {@link Player#loadstart} event if this function was called
   *        through an event.
   *
   * @listens Player#loadstart
   * @listens Player#volumechange
   */
  update(event) {
    this.updateIcon_();
    this.updateControlText_();
  }

  /**
   * Update the appearance of the `MuteToggle` icon.
   *
   * Possible states (given `level` variable below):
   * - 0: crossed out
   * - 1: zero bars of volume
   * - 2: one bar of volume
   * - 3: two bars of volume
   *
   * @private
   */
  updateIcon_() {
    const vol = this.player_.volume();
    let level = 3;

    // in iOS when a player is loaded with muted attribute
    // and volume is changed with a native mute button
    // we want to make sure muted state is updated
    if (IS_IOS && this.player_.tech_ && this.player_.tech_.el_) {
      this.player_.muted(this.player_.tech_.el_.muted);
    }
    if (vol === 0 || this.player_.muted()) {
      level = 0;
    } else if (vol < 0.33) {
      level = 1;
    } else if (vol < 0.67) {
      level = 2;
    }
    removeClass(this.el_, [0, 1, 2, 3].reduce((str, i) => str + `${i ? ' ' : ''}vjs-vol-${i}`, ''));
    addClass(this.el_, `vjs-vol-${level}`);
  }

  /**
   * If `muted` has changed on the player, update the control text
   * (`title` attribute on `vjs-mute-control` element and content of
   * `vjs-control-text` element).
   *
   * @private
   */
  updateControlText_() {
    const soundOff = this.player_.muted() || this.player_.volume() === 0;
    const text = soundOff ? 'Unmute' : 'Mute';
    if (this.controlText() !== text) {
      this.controlText(text);
    }
  }
}

/**
 * The text that should display over the `MuteToggle`s controls. Added for localization.
 *
 * @type {string}
 * @protected
 */
MuteToggle.prototype.controlText_ = 'Mute';
Component.registerComponent('MuteToggle', MuteToggle);

/**
 * @file volume-control.js
 */

/**
 * A Component to contain the MuteToggle and VolumeControl so that
 * they can work together.
 *
 * @extends Component
 */
class VolumePanel extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('./player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options={}]
   *        The key/value store of player options.
   */
  constructor(player, options = {}) {
    if (typeof options.inline !== 'undefined') {
      options.inline = options.inline;
    } else {
      options.inline = true;
    }

    // pass the inline option down to the VolumeControl as vertical if
    // the VolumeControl is on.
    if (typeof options.volumeControl === 'undefined' || isPlain(options.volumeControl)) {
      options.volumeControl = options.volumeControl || {};
      options.volumeControl.vertical = !options.inline;
    }
    super(player, options);

    // this handler is used by mouse handler methods below
    this.handleKeyPressHandler_ = e => this.handleKeyPress(e);
    this.on(player, ['loadstart'], e => this.volumePanelState_(e));
    this.on(this.muteToggle, 'keyup', e => this.handleKeyPress(e));
    this.on(this.volumeControl, 'keyup', e => this.handleVolumeControlKeyUp(e));
    this.on('keydown', e => this.handleKeyPress(e));
    this.on('mouseover', e => this.handleMouseOver(e));
    this.on('mouseout', e => this.handleMouseOut(e));

    // while the slider is active (the mouse has been pressed down and
    // is dragging) we do not want to hide the VolumeBar
    this.on(this.volumeControl, ['slideractive'], this.sliderActive_);
    this.on(this.volumeControl, ['sliderinactive'], this.sliderInactive_);
  }

  /**
   * Add vjs-slider-active class to the VolumePanel
   *
   * @listens VolumeControl#slideractive
   * @private
   */
  sliderActive_() {
    this.addClass('vjs-slider-active');
  }

  /**
   * Removes vjs-slider-active class to the VolumePanel
   *
   * @listens VolumeControl#sliderinactive
   * @private
   */
  sliderInactive_() {
    this.removeClass('vjs-slider-active');
  }

  /**
   * Adds vjs-hidden or vjs-mute-toggle-only to the VolumePanel
   * depending on MuteToggle and VolumeControl state
   *
   * @listens Player#loadstart
   * @private
   */
  volumePanelState_() {
    // hide volume panel if neither volume control or mute toggle
    // are displayed
    if (this.volumeControl.hasClass('vjs-hidden') && this.muteToggle.hasClass('vjs-hidden')) {
      this.addClass('vjs-hidden');
    }

    // if only mute toggle is visible we don't want
    // volume panel expanding when hovered or active
    if (this.volumeControl.hasClass('vjs-hidden') && !this.muteToggle.hasClass('vjs-hidden')) {
      this.addClass('vjs-mute-toggle-only');
    }
  }

  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    let orientationClass = 'vjs-volume-panel-horizontal';
    if (!this.options_.inline) {
      orientationClass = 'vjs-volume-panel-vertical';
    }
    return super.createEl('div', {
      className: `vjs-volume-panel vjs-control ${orientationClass}`
    });
  }

  /**
   * Dispose of the `volume-panel` and all child components.
   */
  dispose() {
    this.handleMouseOut();
    super.dispose();
  }

  /**
   * Handles `keyup` events on the `VolumeControl`, looking for ESC, which closes
   * the volume panel and sets focus on `MuteToggle`.
   *
   * @param {Event} event
   *        The `keyup` event that caused this function to be called.
   *
   * @listens keyup
   */
  handleVolumeControlKeyUp(event) {
    if (keycode.isEventKey(event, 'Esc')) {
      this.muteToggle.focus();
    }
  }

  /**
   * This gets called when a `VolumePanel` gains hover via a `mouseover` event.
   * Turns on listening for `mouseover` event. When they happen it
   * calls `this.handleMouseOver`.
   *
   * @param {Event} event
   *        The `mouseover` event that caused this function to be called.
   *
   * @listens mouseover
   */
  handleMouseOver(event) {
    this.addClass('vjs-hover');
    on(document, 'keyup', this.handleKeyPressHandler_);
  }

  /**
   * This gets called when a `VolumePanel` gains hover via a `mouseout` event.
   * Turns on listening for `mouseout` event. When they happen it
   * calls `this.handleMouseOut`.
   *
   * @param {Event} event
   *        The `mouseout` event that caused this function to be called.
   *
   * @listens mouseout
   */
  handleMouseOut(event) {
    this.removeClass('vjs-hover');
    off(document, 'keyup', this.handleKeyPressHandler_);
  }

  /**
   * Handles `keyup` event on the document or `keydown` event on the `VolumePanel`,
   * looking for ESC, which hides the `VolumeControl`.
   *
   * @param {Event} event
   *        The keypress that triggered this event.
   *
   * @listens keydown | keyup
   */
  handleKeyPress(event) {
    if (keycode.isEventKey(event, 'Esc')) {
      this.handleMouseOut();
    }
  }
}

/**
 * Default options for the `VolumeControl`
 *
 * @type {Object}
 * @private
 */
VolumePanel.prototype.options_ = {
  children: ['muteToggle', 'volumeControl']
};
Component.registerComponent('VolumePanel', VolumePanel);

/**
 * Button to skip forward a configurable amount of time
 * through a video. Renders in the control bar.
 *
 * e.g. options: {controlBar: {skipButtons: forward: 5}}
 *
 * @extends Button
 */
class SkipForward extends Button {
  constructor(player, options) {
    super(player, options);
    this.validOptions = [5, 10, 30];
    this.skipTime = this.getSkipForwardTime();
    if (this.skipTime && this.validOptions.includes(this.skipTime)) {
      this.controlText(this.localize('Skip forward {1} seconds', [this.skipTime]));
      this.show();
    } else {
      this.hide();
    }
  }
  getSkipForwardTime() {
    const playerOptions = this.options_.playerOptions;
    return playerOptions.controlBar && playerOptions.controlBar.skipButtons && playerOptions.controlBar.skipButtons.forward;
  }
  buildCSSClass() {
    return `vjs-skip-forward-${this.getSkipForwardTime()} ${super.buildCSSClass()}`;
  }

  /**
   * On click, skips forward in the duration/seekable range by a configurable amount of seconds.
   * If the time left in the duration/seekable range is less than the configured 'skip forward' time,
   * skips to end of duration/seekable range.
   *
   * Handle a click on a `SkipForward` button
   *
   * @param {EventTarget~Event} event
   *        The `click` event that caused this function
   *        to be called
   */
  handleClick(event) {
    const currentVideoTime = this.player_.currentTime();
    const liveTracker = this.player_.liveTracker;
    const duration = liveTracker && liveTracker.isLive() ? liveTracker.seekableEnd() : this.player_.duration();
    let newTime;
    if (currentVideoTime + this.skipTime <= duration) {
      newTime = currentVideoTime + this.skipTime;
    } else {
      newTime = duration;
    }
    this.player_.currentTime(newTime);
  }

  /**
   * Update control text on languagechange
   */
  handleLanguagechange() {
    this.controlText(this.localize('Skip forward {1} seconds', [this.skipTime]));
  }
}
Component.registerComponent('SkipForward', SkipForward);

/**
 * Button to skip backward a configurable amount of time
 * through a video. Renders in the control bar.
 *
 *  * e.g. options: {controlBar: {skipButtons: backward: 5}}
 *
 * @extends Button
 */
class SkipBackward extends Button {
  constructor(player, options) {
    super(player, options);
    this.validOptions = [5, 10, 30];
    this.skipTime = this.getSkipBackwardTime();
    if (this.skipTime && this.validOptions.includes(this.skipTime)) {
      this.controlText(this.localize('Skip backward {1} seconds', [this.skipTime]));
      this.show();
    } else {
      this.hide();
    }
  }
  getSkipBackwardTime() {
    const playerOptions = this.options_.playerOptions;
    return playerOptions.controlBar && playerOptions.controlBar.skipButtons && playerOptions.controlBar.skipButtons.backward;
  }
  buildCSSClass() {
    return `vjs-skip-backward-${this.getSkipBackwardTime()} ${super.buildCSSClass()}`;
  }

  /**
   * On click, skips backward in the video by a configurable amount of seconds.
   * If the current time in the video is less than the configured 'skip backward' time,
   * skips to beginning of video or seekable range.
   *
   * Handle a click on a `SkipBackward` button
   *
   * @param {EventTarget~Event} event
   *        The `click` event that caused this function
   *        to be called
   */
  handleClick(event) {
    const currentVideoTime = this.player_.currentTime();
    const liveTracker = this.player_.liveTracker;
    const seekableStart = liveTracker && liveTracker.isLive() && liveTracker.seekableStart();
    let newTime;
    if (seekableStart && currentVideoTime - this.skipTime <= seekableStart) {
      newTime = seekableStart;
    } else if (currentVideoTime >= this.skipTime) {
      newTime = currentVideoTime - this.skipTime;
    } else {
      newTime = 0;
    }
    this.player_.currentTime(newTime);
  }

  /**
   * Update control text on languagechange
   */
  handleLanguagechange() {
    this.controlText(this.localize('Skip backward {1} seconds', [this.skipTime]));
  }
}
SkipBackward.prototype.controlText_ = 'Skip Backward';
Component.registerComponent('SkipBackward', SkipBackward);

/**
 * @file menu.js
 */

/**
 * The Menu component is used to build popup menus, including subtitle and
 * captions selection menus.
 *
 * @extends Component
 */
class Menu extends Component {
  /**
   * Create an instance of this class.
   *
   * @param { import('../player').default } player
   *        the player that this component should attach to
   *
   * @param {Object} [options]
   *        Object of option names and values
   *
   */
  constructor(player, options) {
    super(player, options);
    if (options) {
      this.menuButton_ = options.menuButton;
    }
    this.focusedChild_ = -1;
    this.on('keydown', e => this.handleKeyDown(e));

    // All the menu item instances share the same blur handler provided by the menu container.
    this.boundHandleBlur_ = e => this.handleBlur(e);
    this.boundHandleTapClick_ = e => this.handleTapClick(e);
  }

  /**
   * Add event listeners to the {@link MenuItem}.
   *
   * @param {Object} component
   *        The instance of the `MenuItem` to add listeners to.
   *
   */
  addEventListenerForItem(component) {
    if (!(component instanceof Component)) {
      return;
    }
    this.on(component, 'blur', this.boundHandleBlur_);
    this.on(component, ['tap', 'click'], this.boundHandleTapClick_);
  }

  /**
   * Remove event listeners from the {@link MenuItem}.
   *
   * @param {Object} component
   *        The instance of the `MenuItem` to remove listeners.
   *
   */
  removeEventListenerForItem(component) {
    if (!(component instanceof Component)) {
      return;
    }
    this.off(component, 'blur', this.boundHandleBlur_);
    this.off(component, ['tap', 'click'], this.boundHandleTapClick_);
  }

  /**
   * This method will be called indirectly when the component has been added
   * before the component adds to the new menu instance by `addItem`.
   * In this case, the original menu instance will remove the component
   * by calling `removeChild`.
   *
   * @param {Object} component
   *        The instance of the `MenuItem`
   */
  removeChild(component) {
    if (typeof component === 'string') {
      component = this.getChild(component);
    }
    this.removeEventListenerForItem(component);
    super.removeChild(component);
  }

  /**
   * Add a {@link MenuItem} to the menu.
   *
   * @param {Object|string} component
   *        The name or instance of the `MenuItem` to add.
   *
   */
  addItem(component) {
    const childComponent = this.addChild(component);
    if (childComponent) {
      this.addEventListenerForItem(childComponent);
    }
  }

  /**
   * Create the `Menu`s DOM element.
   *
   * @return {Element}
   *         the element that was created
   */
  createEl() {
    const contentElType = this.options_.contentElType || 'ul';
    this.contentEl_ = createEl(contentElType, {
      className: 'vjs-menu-content'
    });
    this.contentEl_.setAttribute('role', 'menu');
    const el = super.createEl('div', {
      append: this.contentEl_,
      className: 'vjs-menu'
    });
    el.appendChild(this.contentEl_);

    // Prevent clicks from bubbling up. Needed for Menu Buttons,
    // where a click on the parent is significant
    on(el, 'click', function (event) {
      event.preventDefault();
      event.stopImmediatePropagation();
    });
    return el;
  }
  dispose() {
    this.contentEl_ = null;
    this.boundHandleBlur_ = null;
    this.boundHandleTapClick_ = null;
    super.dispose();
  }

  /**
   * Called when a `MenuItem` loses focus.
   *
   * @param {Event} event
   *        The `blur` event that caused this function to be called.
   *
   * @listens blur
   */
  handleBlur(event) {
    const relatedTarget = event.relatedTarget || document.activeElement;

    // Close menu popup when a user clicks outside the menu
    if (!this.children().some(element => {
      return element.el() === relatedTarget;
    })) {
      const btn = this.menuButton_;
      if (btn && btn.buttonPressed_ && relatedTarget !== btn.el().firstChild) {
        btn.unpressButton();
      }
    }
  }

  /**
   * Called when a `MenuItem` gets clicked or tapped.
   *
   * @param {Event} event
   *        The `click` or `tap` event that caused this function to be called.
   *
   * @listens click,tap
   */
  handleTapClick(event) {
    // Unpress the associated MenuButton, and move focus back to it
    if (this.menuButton_) {
      this.menuButton_.unpressButton();
      const childComponents = this.children();
      if (!Array.isArray(childComponents)) {
        return;
      }
      const foundComponent = childComponents.filter(component => component.el() === event.target)[0];
      if (!foundComponent) {
        return;
      }

      // don't focus menu button if item is a caption settings item
      // because focus will move elsewhere
      if (foundComponent.name() !== 'CaptionSettingsMenuItem') {
        this.menuButton_.focus();
      }
    }
  }

  /**
   * Handle a `keydown` event on this menu. This listener is added in the constructor.
   *
   * @param {Event} event
   *        A `keydown` event that happened on the menu.
   *
   * @listens keydown
   */
  handleKeyDown(event) {
    // Left and Down Arrows
    if (keycode.isEventKey(event, 'Left') || keycode.isEventKey(event, 'Down')) {
      event.preventDefault();
      event.stopPropagation();
      this.stepForward();

      // Up and Right Arrows
    } else if (keycode.isEventKey(event, 'Right') || keycode.isEventKey(event, 'Up')) {
      event.preventDefault();
      event.stopPropagation();
      this.stepBack();
    }
  }

  /**
   * Move to next (lower) menu item for keyboard users.
   */
  stepForward() {
    let stepChild = 0;
    if (this.focusedChild_ !== undefined) {
      stepChild = this.focusedChild_ + 1;
    }
    this.focus(stepChild);
  }

  /**
   * Move to previous (higher) menu item for keyboard users.
   */
  stepBack() {
    let stepChild = 0;
    if (this.focusedChild_ !== undefined) {
      stepChild = this.focusedChild_ - 1;
    }
    this.focus(stepChild);
  }

  /**
   * Set focus on a {@link MenuItem} in the `Menu`.
   *
   * @param {Object|string} [item=0]
   *        Index of child item set focus on.
   */
  focus(item = 0) {
    const children = this.children().slice();
    const haveTitle = children.length && children[0].hasClass('vjs-menu-title');
    if (haveTitle) {
      children.shift();
    }
    if (children.length > 0) {
      if (item < 0) {
        item = 0;
      } else if (item >= children.length) {
        item = children.length - 1;
      }
      this.focusedChild_ = item;
      children[item].el_.focus();
    }
  }
}
Component.registerComponent('Menu', Menu);

/**
 * @file menu-button.js
 */

/**
 * A `MenuButton` class for any popup {@link Menu}.
 *
 * @extends Component
 */
class MenuButton extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options={}]
   *        The key/value store of player options.
   */
  constructor(player, options = {}) {
    super(player, options);
    this.menuButton_ = new Button(player, options);
    this.menuButton_.controlText(this.controlText_);
    this.menuButton_.el_.setAttribute('aria-haspopup', 'true');

    // Add buildCSSClass values to the button, not the wrapper
    const buttonClass = Button.prototype.buildCSSClass();
    this.menuButton_.el_.className = this.buildCSSClass() + ' ' + buttonClass;
    this.menuButton_.removeClass('vjs-control');
    this.addChild(this.menuButton_);
    this.update();
    this.enabled_ = true;
    const handleClick = e => this.handleClick(e);
    this.handleMenuKeyUp_ = e => this.handleMenuKeyUp(e);
    this.on(this.menuButton_, 'tap', handleClick);
    this.on(this.menuButton_, 'click', handleClick);
    this.on(this.menuButton_, 'keydown', e => this.handleKeyDown(e));
    this.on(this.menuButton_, 'mouseenter', () => {
      this.addClass('vjs-hover');
      this.menu.show();
      on(document, 'keyup', this.handleMenuKeyUp_);
    });
    this.on('mouseleave', e => this.handleMouseLeave(e));
    this.on('keydown', e => this.handleSubmenuKeyDown(e));
  }

  /**
   * Update the menu based on the current state of its items.
   */
  update() {
    const menu = this.createMenu();
    if (this.menu) {
      this.menu.dispose();
      this.removeChild(this.menu);
    }
    this.menu = menu;
    this.addChild(menu);

    /**
     * Track the state of the menu button
     *
     * @type {Boolean}
     * @private
     */
    this.buttonPressed_ = false;
    this.menuButton_.el_.setAttribute('aria-expanded', 'false');
    if (this.items && this.items.length <= this.hideThreshold_) {
      this.hide();
      this.menu.contentEl_.removeAttribute('role');
    } else {
      this.show();
      this.menu.contentEl_.setAttribute('role', 'menu');
    }
  }

  /**
   * Create the menu and add all items to it.
   *
   * @return {Menu}
   *         The constructed menu
   */
  createMenu() {
    const menu = new Menu(this.player_, {
      menuButton: this
    });

    /**
     * Hide the menu if the number of items is less than or equal to this threshold. This defaults
     * to 0 and whenever we add items which can be hidden to the menu we'll increment it. We list
     * it here because every time we run `createMenu` we need to reset the value.
     *
     * @protected
     * @type {Number}
     */
    this.hideThreshold_ = 0;

    // Add a title list item to the top
    if (this.options_.title) {
      const titleEl = createEl('li', {
        className: 'vjs-menu-title',
        textContent: toTitleCase(this.options_.title),
        tabIndex: -1
      });
      const titleComponent = new Component(this.player_, {
        el: titleEl
      });
      menu.addItem(titleComponent);
    }
    this.items = this.createItems();
    if (this.items) {
      // Add menu items to the menu
      for (let i = 0; i < this.items.length; i++) {
        menu.addItem(this.items[i]);
      }
    }
    return menu;
  }

  /**
   * Create the list of menu items. Specific to each subclass.
   *
   * @abstract
   */
  createItems() {}

  /**
   * Create the `MenuButtons`s DOM element.
   *
   * @return {Element}
   *         The element that gets created.
   */
  createEl() {
    return super.createEl('div', {
      className: this.buildWrapperCSSClass()
    }, {});
  }

  /**
   * Allow sub components to stack CSS class names for the wrapper element
   *
   * @return {string}
   *         The constructed wrapper DOM `className`
   */
  buildWrapperCSSClass() {
    let menuButtonClass = 'vjs-menu-button';

    // If the inline option is passed, we want to use different styles altogether.
    if (this.options_.inline === true) {
      menuButtonClass += '-inline';
    } else {
      menuButtonClass += '-popup';
    }

    // TODO: Fix the CSS so that this isn't necessary
    const buttonClass = Button.prototype.buildCSSClass();
    return `vjs-menu-button ${menuButtonClass} ${buttonClass} ${super.buildCSSClass()}`;
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    let menuButtonClass = 'vjs-menu-button';

    // If the inline option is passed, we want to use different styles altogether.
    if (this.options_.inline === true) {
      menuButtonClass += '-inline';
    } else {
      menuButtonClass += '-popup';
    }
    return `vjs-menu-button ${menuButtonClass} ${super.buildCSSClass()}`;
  }

  /**
   * Get or set the localized control text that will be used for accessibility.
   *
   * > NOTE: This will come from the internal `menuButton_` element.
   *
   * @param {string} [text]
   *        Control text for element.
   *
   * @param {Element} [el=this.menuButton_.el()]
   *        Element to set the title on.
   *
   * @return {string}
   *         - The control text when getting
   */
  controlText(text, el = this.menuButton_.el()) {
    return this.menuButton_.controlText(text, el);
  }

  /**
   * Dispose of the `menu-button` and all child components.
   */
  dispose() {
    this.handleMouseLeave();
    super.dispose();
  }

  /**
   * Handle a click on a `MenuButton`.
   * See {@link ClickableComponent#handleClick} for instances where this is called.
   *
   * @param {Event} event
   *        The `keydown`, `tap`, or `click` event that caused this function to be
   *        called.
   *
   * @listens tap
   * @listens click
   */
  handleClick(event) {
    if (this.buttonPressed_) {
      this.unpressButton();
    } else {
      this.pressButton();
    }
  }

  /**
   * Handle `mouseleave` for `MenuButton`.
   *
   * @param {Event} event
   *        The `mouseleave` event that caused this function to be called.
   *
   * @listens mouseleave
   */
  handleMouseLeave(event) {
    this.removeClass('vjs-hover');
    off(document, 'keyup', this.handleMenuKeyUp_);
  }

  /**
   * Set the focus to the actual button, not to this element
   */
  focus() {
    this.menuButton_.focus();
  }

  /**
   * Remove the focus from the actual button, not this element
   */
  blur() {
    this.menuButton_.blur();
  }

  /**
   * Handle tab, escape, down arrow, and up arrow keys for `MenuButton`. See
   * {@link ClickableComponent#handleKeyDown} for instances where this is called.
   *
   * @param {Event} event
   *        The `keydown` event that caused this function to be called.
   *
   * @listens keydown
   */
  handleKeyDown(event) {
    // Escape or Tab unpress the 'button'
    if (keycode.isEventKey(event, 'Esc') || keycode.isEventKey(event, 'Tab')) {
      if (this.buttonPressed_) {
        this.unpressButton();
      }

      // Don't preventDefault for Tab key - we still want to lose focus
      if (!keycode.isEventKey(event, 'Tab')) {
        event.preventDefault();
        // Set focus back to the menu button's button
        this.menuButton_.focus();
      }
      // Up Arrow or Down Arrow also 'press' the button to open the menu
    } else if (keycode.isEventKey(event, 'Up') || keycode.isEventKey(event, 'Down')) {
      if (!this.buttonPressed_) {
        event.preventDefault();
        this.pressButton();
      }
    }
  }

  /**
   * Handle a `keyup` event on a `MenuButton`. The listener for this is added in
   * the constructor.
   *
   * @param {Event} event
   *        Key press event
   *
   * @listens keyup
   */
  handleMenuKeyUp(event) {
    // Escape hides popup menu
    if (keycode.isEventKey(event, 'Esc') || keycode.isEventKey(event, 'Tab')) {
      this.removeClass('vjs-hover');
    }
  }

  /**
   * This method name now delegates to `handleSubmenuKeyDown`. This means
   * anyone calling `handleSubmenuKeyPress` will not see their method calls
   * stop working.
   *
   * @param {Event} event
   *        The event that caused this function to be called.
   */
  handleSubmenuKeyPress(event) {
    this.handleSubmenuKeyDown(event);
  }

  /**
   * Handle a `keydown` event on a sub-menu. The listener for this is added in
   * the constructor.
   *
   * @param {Event} event
   *        Key press event
   *
   * @listens keydown
   */
  handleSubmenuKeyDown(event) {
    // Escape or Tab unpress the 'button'
    if (keycode.isEventKey(event, 'Esc') || keycode.isEventKey(event, 'Tab')) {
      if (this.buttonPressed_) {
        this.unpressButton();
      }
      // Don't preventDefault for Tab key - we still want to lose focus
      if (!keycode.isEventKey(event, 'Tab')) {
        event.preventDefault();
        // Set focus back to the menu button's button
        this.menuButton_.focus();
      }
    }
  }

  /**
   * Put the current `MenuButton` into a pressed state.
   */
  pressButton() {
    if (this.enabled_) {
      this.buttonPressed_ = true;
      this.menu.show();
      this.menu.lockShowing();
      this.menuButton_.el_.setAttribute('aria-expanded', 'true');

      // set the focus into the submenu, except on iOS where it is resulting in
      // undesired scrolling behavior when the player is in an iframe
      if (IS_IOS && isInFrame()) {
        // Return early so that the menu isn't focused
        return;
      }
      this.menu.focus();
    }
  }

  /**
   * Take the current `MenuButton` out of a pressed state.
   */
  unpressButton() {
    if (this.enabled_) {
      this.buttonPressed_ = false;
      this.menu.unlockShowing();
      this.menu.hide();
      this.menuButton_.el_.setAttribute('aria-expanded', 'false');
    }
  }

  /**
   * Disable the `MenuButton`. Don't allow it to be clicked.
   */
  disable() {
    this.unpressButton();
    this.enabled_ = false;
    this.addClass('vjs-disabled');
    this.menuButton_.disable();
  }

  /**
   * Enable the `MenuButton`. Allow it to be clicked.
   */
  enable() {
    this.enabled_ = true;
    this.removeClass('vjs-disabled');
    this.menuButton_.enable();
  }
}
Component.registerComponent('MenuButton', MenuButton);

/**
 * @file track-button.js
 */

/**
 * The base class for buttons that toggle specific  track types (e.g. subtitles).
 *
 * @extends MenuButton
 */
class TrackButton extends MenuButton {
  /**
   * Creates an instance of this class.
   *
   * @param { import('./player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    const tracks = options.tracks;
    super(player, options);
    if (this.items.length <= 1) {
      this.hide();
    }
    if (!tracks) {
      return;
    }
    const updateHandler = bind_(this, this.update);
    tracks.addEventListener('removetrack', updateHandler);
    tracks.addEventListener('addtrack', updateHandler);
    tracks.addEventListener('labelchange', updateHandler);
    this.player_.on('ready', updateHandler);
    this.player_.on('dispose', function () {
      tracks.removeEventListener('removetrack', updateHandler);
      tracks.removeEventListener('addtrack', updateHandler);
      tracks.removeEventListener('labelchange', updateHandler);
    });
  }
}
Component.registerComponent('TrackButton', TrackButton);

/**
 * @file menu-keys.js
 */

/**
  * All keys used for operation of a menu (`MenuButton`, `Menu`, and `MenuItem`)
  * Note that 'Enter' and 'Space' are not included here (otherwise they would
  * prevent the `MenuButton` and `MenuItem` from being keyboard-clickable)
 *
  * @typedef MenuKeys
  * @array
  */
const MenuKeys = ['Tab', 'Esc', 'Up', 'Down', 'Right', 'Left'];

/**
 * @file menu-item.js
 */

/**
 * The component for a menu item. `<li>`
 *
 * @extends ClickableComponent
 */
class MenuItem extends ClickableComponent {
  /**
   * Creates an instance of the this class.
   *
   * @param { import('../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options={}]
   *        The key/value store of player options.
   *
   */
  constructor(player, options) {
    super(player, options);
    this.selectable = options.selectable;
    this.isSelected_ = options.selected || false;
    this.multiSelectable = options.multiSelectable;
    this.selected(this.isSelected_);
    if (this.selectable) {
      if (this.multiSelectable) {
        this.el_.setAttribute('role', 'menuitemcheckbox');
      } else {
        this.el_.setAttribute('role', 'menuitemradio');
      }
    } else {
      this.el_.setAttribute('role', 'menuitem');
    }
  }

  /**
   * Create the `MenuItem's DOM element
   *
   * @param {string} [type=li]
   *        Element's node type, not actually used, always set to `li`.
   *
   * @param {Object} [props={}]
   *        An object of properties that should be set on the element
   *
   * @param {Object} [attrs={}]
   *        An object of attributes that should be set on the element
   *
   * @return {Element}
   *         The element that gets created.
   */
  createEl(type, props, attrs) {
    // The control is textual, not just an icon
    this.nonIconControl = true;
    const el = super.createEl('li', Object.assign({
      className: 'vjs-menu-item',
      tabIndex: -1
    }, props), attrs);

    // swap icon with menu item text.
    el.replaceChild(createEl('span', {
      className: 'vjs-menu-item-text',
      textContent: this.localize(this.options_.label)
    }), el.querySelector('.vjs-icon-placeholder'));
    return el;
  }

  /**
   * Ignore keys which are used by the menu, but pass any other ones up. See
   * {@link ClickableComponent#handleKeyDown} for instances where this is called.
   *
   * @param {Event} event
   *        The `keydown` event that caused this function to be called.
   *
   * @listens keydown
   */
  handleKeyDown(event) {
    if (!MenuKeys.some(key => keycode.isEventKey(event, key))) {
      // Pass keydown handling up for unused keys
      super.handleKeyDown(event);
    }
  }

  /**
   * Any click on a `MenuItem` puts it into the selected state.
   * See {@link ClickableComponent#handleClick} for instances where this is called.
   *
   * @param {Event} event
   *        The `keydown`, `tap`, or `click` event that caused this function to be
   *        called.
   *
   * @listens tap
   * @listens click
   */
  handleClick(event) {
    this.selected(true);
  }

  /**
   * Set the state for this menu item as selected or not.
   *
   * @param {boolean} selected
   *        if the menu item is selected or not
   */
  selected(selected) {
    if (this.selectable) {
      if (selected) {
        this.addClass('vjs-selected');
        this.el_.setAttribute('aria-checked', 'true');
        // aria-checked isn't fully supported by browsers/screen readers,
        // so indicate selected state to screen reader in the control text.
        this.controlText(', selected');
        this.isSelected_ = true;
      } else {
        this.removeClass('vjs-selected');
        this.el_.setAttribute('aria-checked', 'false');
        // Indicate un-selected state to screen reader
        this.controlText('');
        this.isSelected_ = false;
      }
    }
  }
}
Component.registerComponent('MenuItem', MenuItem);

/**
 * @file text-track-menu-item.js
 */

/**
 * The specific menu item type for selecting a language within a text track kind
 *
 * @extends MenuItem
 */
class TextTrackMenuItem extends MenuItem {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    const track = options.track;
    const tracks = player.textTracks();

    // Modify options for parent MenuItem class's init.
    options.label = track.label || track.language || 'Unknown';
    options.selected = track.mode === 'showing';
    super(player, options);
    this.track = track;
    // Determine the relevant kind(s) of tracks for this component and filter
    // out empty kinds.
    this.kinds = (options.kinds || [options.kind || this.track.kind]).filter(Boolean);
    const changeHandler = (...args) => {
      this.handleTracksChange.apply(this, args);
    };
    const selectedLanguageChangeHandler = (...args) => {
      this.handleSelectedLanguageChange.apply(this, args);
    };
    player.on(['loadstart', 'texttrackchange'], changeHandler);
    tracks.addEventListener('change', changeHandler);
    tracks.addEventListener('selectedlanguagechange', selectedLanguageChangeHandler);
    this.on('dispose', function () {
      player.off(['loadstart', 'texttrackchange'], changeHandler);
      tracks.removeEventListener('change', changeHandler);
      tracks.removeEventListener('selectedlanguagechange', selectedLanguageChangeHandler);
    });

    // iOS7 doesn't dispatch change events to TextTrackLists when an
    // associated track's mode changes. Without something like
    // Object.observe() (also not present on iOS7), it's not
    // possible to detect changes to the mode attribute and polyfill
    // the change event. As a poor substitute, we manually dispatch
    // change events whenever the controls modify the mode.
    if (tracks.onchange === undefined) {
      let event;
      this.on(['tap', 'click'], function () {
        if (typeof window.Event !== 'object') {
          // Android 2.3 throws an Illegal Constructor error for window.Event
          try {
            event = new window.Event('change');
          } catch (err) {
            // continue regardless of error
          }
        }
        if (!event) {
          event = document.createEvent('Event');
          event.initEvent('change', true, true);
        }
        tracks.dispatchEvent(event);
      });
    }

    // set the default state based on current tracks
    this.handleTracksChange();
  }

  /**
   * This gets called when an `TextTrackMenuItem` is "clicked". See
   * {@link ClickableComponent} for more detailed information on what a click can be.
   *
   * @param {Event} event
   *        The `keydown`, `tap`, or `click` event that caused this function to be
   *        called.
   *
   * @listens tap
   * @listens click
   */
  handleClick(event) {
    const referenceTrack = this.track;
    const tracks = this.player_.textTracks();
    super.handleClick(event);
    if (!tracks) {
      return;
    }
    for (let i = 0; i < tracks.length; i++) {
      const track = tracks[i];

      // If the track from the text tracks list is not of the right kind,
      // skip it. We do not want to affect tracks of incompatible kind(s).
      if (this.kinds.indexOf(track.kind) === -1) {
        continue;
      }

      // If this text track is the component's track and it is not showing,
      // set it to showing.
      if (track === referenceTrack) {
        if (track.mode !== 'showing') {
          track.mode = 'showing';
        }

        // If this text track is not the component's track and it is not
        // disabled, set it to disabled.
      } else if (track.mode !== 'disabled') {
        track.mode = 'disabled';
      }
    }
  }

  /**
   * Handle text track list change
   *
   * @param {Event} event
   *        The `change` event that caused this function to be called.
   *
   * @listens TextTrackList#change
   */
  handleTracksChange(event) {
    const shouldBeSelected = this.track.mode === 'showing';

    // Prevent redundant selected() calls because they may cause
    // screen readers to read the appended control text unnecessarily
    if (shouldBeSelected !== this.isSelected_) {
      this.selected(shouldBeSelected);
    }
  }
  handleSelectedLanguageChange(event) {
    if (this.track.mode === 'showing') {
      const selectedLanguage = this.player_.cache_.selectedLanguage;

      // Don't replace the kind of track across the same language
      if (selectedLanguage && selectedLanguage.enabled && selectedLanguage.language === this.track.language && selectedLanguage.kind !== this.track.kind) {
        return;
      }
      this.player_.cache_.selectedLanguage = {
        enabled: true,
        language: this.track.language,
        kind: this.track.kind
      };
    }
  }
  dispose() {
    // remove reference to track object on dispose
    this.track = null;
    super.dispose();
  }
}
Component.registerComponent('TextTrackMenuItem', TextTrackMenuItem);

/**
 * @file off-text-track-menu-item.js
 */

/**
 * A special menu item for turning of a specific type of text track
 *
 * @extends TextTrackMenuItem
 */
class OffTextTrackMenuItem extends TextTrackMenuItem {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    // Create pseudo track info
    // Requires options['kind']
    options.track = {
      player,
      // it is no longer necessary to store `kind` or `kinds` on the track itself
      // since they are now stored in the `kinds` property of all instances of
      // TextTrackMenuItem, but this will remain for backwards compatibility
      kind: options.kind,
      kinds: options.kinds,
      default: false,
      mode: 'disabled'
    };
    if (!options.kinds) {
      options.kinds = [options.kind];
    }
    if (options.label) {
      options.track.label = options.label;
    } else {
      options.track.label = options.kinds.join(' and ') + ' off';
    }

    // MenuItem is selectable
    options.selectable = true;
    // MenuItem is NOT multiSelectable (i.e. only one can be marked "selected" at a time)
    options.multiSelectable = false;
    super(player, options);
  }

  /**
   * Handle text track change
   *
   * @param {Event} event
   *        The event that caused this function to run
   */
  handleTracksChange(event) {
    const tracks = this.player().textTracks();
    let shouldBeSelected = true;
    for (let i = 0, l = tracks.length; i < l; i++) {
      const track = tracks[i];
      if (this.options_.kinds.indexOf(track.kind) > -1 && track.mode === 'showing') {
        shouldBeSelected = false;
        break;
      }
    }

    // Prevent redundant selected() calls because they may cause
    // screen readers to read the appended control text unnecessarily
    if (shouldBeSelected !== this.isSelected_) {
      this.selected(shouldBeSelected);
    }
  }
  handleSelectedLanguageChange(event) {
    const tracks = this.player().textTracks();
    let allHidden = true;
    for (let i = 0, l = tracks.length; i < l; i++) {
      const track = tracks[i];
      if (['captions', 'descriptions', 'subtitles'].indexOf(track.kind) > -1 && track.mode === 'showing') {
        allHidden = false;
        break;
      }
    }
    if (allHidden) {
      this.player_.cache_.selectedLanguage = {
        enabled: false
      };
    }
  }

  /**
   * Update control text and label on languagechange
   */
  handleLanguagechange() {
    this.$('.vjs-menu-item-text').textContent = this.player_.localize(this.options_.label);
    super.handleLanguagechange();
  }
}
Component.registerComponent('OffTextTrackMenuItem', OffTextTrackMenuItem);

/**
 * @file text-track-button.js
 */

/**
 * The base class for buttons that toggle specific text track types (e.g. subtitles)
 *
 * @extends MenuButton
 */
class TextTrackButton extends TrackButton {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options={}]
   *        The key/value store of player options.
   */
  constructor(player, options = {}) {
    options.tracks = player.textTracks();
    super(player, options);
  }

  /**
   * Create a menu item for each text track
   *
   * @param {TextTrackMenuItem[]} [items=[]]
   *        Existing array of items to use during creation
   *
   * @return {TextTrackMenuItem[]}
   *         Array of menu items that were created
   */
  createItems(items = [], TrackMenuItem = TextTrackMenuItem) {
    // Label is an override for the [track] off label
    // USed to localise captions/subtitles
    let label;
    if (this.label_) {
      label = `${this.label_} off`;
    }
    // Add an OFF menu item to turn all tracks off
    items.push(new OffTextTrackMenuItem(this.player_, {
      kinds: this.kinds_,
      kind: this.kind_,
      label
    }));
    this.hideThreshold_ += 1;
    const tracks = this.player_.textTracks();
    if (!Array.isArray(this.kinds_)) {
      this.kinds_ = [this.kind_];
    }
    for (let i = 0; i < tracks.length; i++) {
      const track = tracks[i];

      // only add tracks that are of an appropriate kind and have a label
      if (this.kinds_.indexOf(track.kind) > -1) {
        const item = new TrackMenuItem(this.player_, {
          track,
          kinds: this.kinds_,
          kind: this.kind_,
          // MenuItem is selectable
          selectable: true,
          // MenuItem is NOT multiSelectable (i.e. only one can be marked "selected" at a time)
          multiSelectable: false
        });
        item.addClass(`vjs-${track.kind}-menu-item`);
        items.push(item);
      }
    }
    return items;
  }
}
Component.registerComponent('TextTrackButton', TextTrackButton);

/**
 * @file chapters-track-menu-item.js
 */

/**
 * The chapter track menu item
 *
 * @extends MenuItem
 */
class ChaptersTrackMenuItem extends MenuItem {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    const track = options.track;
    const cue = options.cue;
    const currentTime = player.currentTime();

    // Modify options for parent MenuItem class's init.
    options.selectable = true;
    options.multiSelectable = false;
    options.label = cue.text;
    options.selected = cue.startTime <= currentTime && currentTime < cue.endTime;
    super(player, options);
    this.track = track;
    this.cue = cue;
  }

  /**
   * This gets called when an `ChaptersTrackMenuItem` is "clicked". See
   * {@link ClickableComponent} for more detailed information on what a click can be.
   *
   * @param {Event} [event]
   *        The `keydown`, `tap`, or `click` event that caused this function to be
   *        called.
   *
   * @listens tap
   * @listens click
   */
  handleClick(event) {
    super.handleClick();
    this.player_.currentTime(this.cue.startTime);
  }
}
Component.registerComponent('ChaptersTrackMenuItem', ChaptersTrackMenuItem);

/**
 * @file chapters-button.js
 */

/**
 * The button component for toggling and selecting chapters
 * Chapters act much differently than other text tracks
 * Cues are navigation vs. other tracks of alternative languages
 *
 * @extends TextTrackButton
 */
class ChaptersButton extends TextTrackButton {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   *
   * @param {Function} [ready]
   *        The function to call when this function is ready.
   */
  constructor(player, options, ready) {
    super(player, options, ready);
    this.selectCurrentItem_ = () => {
      this.items.forEach(item => {
        item.selected(this.track_.activeCues[0] === item.cue);
      });
    };
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `vjs-chapters-button ${super.buildCSSClass()}`;
  }
  buildWrapperCSSClass() {
    return `vjs-chapters-button ${super.buildWrapperCSSClass()}`;
  }

  /**
   * Update the menu based on the current state of its items.
   *
   * @param {Event} [event]
   *        An event that triggered this function to run.
   *
   * @listens TextTrackList#addtrack
   * @listens TextTrackList#removetrack
   * @listens TextTrackList#change
   */
  update(event) {
    if (event && event.track && event.track.kind !== 'chapters') {
      return;
    }
    const track = this.findChaptersTrack();
    if (track !== this.track_) {
      this.setTrack(track);
      super.update();
    } else if (!this.items || track && track.cues && track.cues.length !== this.items.length) {
      // Update the menu initially or if the number of cues has changed since set
      super.update();
    }
  }

  /**
   * Set the currently selected track for the chapters button.
   *
   * @param {TextTrack} track
   *        The new track to select. Nothing will change if this is the currently selected
   *        track.
   */
  setTrack(track) {
    if (this.track_ === track) {
      return;
    }
    if (!this.updateHandler_) {
      this.updateHandler_ = this.update.bind(this);
    }

    // here this.track_ refers to the old track instance
    if (this.track_) {
      const remoteTextTrackEl = this.player_.remoteTextTrackEls().getTrackElementByTrack_(this.track_);
      if (remoteTextTrackEl) {
        remoteTextTrackEl.removeEventListener('load', this.updateHandler_);
      }
      this.track_.removeEventListener('cuechange', this.selectCurrentItem_);
      this.track_ = null;
    }
    this.track_ = track;

    // here this.track_ refers to the new track instance
    if (this.track_) {
      this.track_.mode = 'hidden';
      const remoteTextTrackEl = this.player_.remoteTextTrackEls().getTrackElementByTrack_(this.track_);
      if (remoteTextTrackEl) {
        remoteTextTrackEl.addEventListener('load', this.updateHandler_);
      }
      this.track_.addEventListener('cuechange', this.selectCurrentItem_);
    }
  }

  /**
   * Find the track object that is currently in use by this ChaptersButton
   *
   * @return {TextTrack|undefined}
   *         The current track or undefined if none was found.
   */
  findChaptersTrack() {
    const tracks = this.player_.textTracks() || [];
    for (let i = tracks.length - 1; i >= 0; i--) {
      // We will always choose the last track as our chaptersTrack
      const track = tracks[i];
      if (track.kind === this.kind_) {
        return track;
      }
    }
  }

  /**
   * Get the caption for the ChaptersButton based on the track label. This will also
   * use the current tracks localized kind as a fallback if a label does not exist.
   *
   * @return {string}
   *         The tracks current label or the localized track kind.
   */
  getMenuCaption() {
    if (this.track_ && this.track_.label) {
      return this.track_.label;
    }
    return this.localize(toTitleCase(this.kind_));
  }

  /**
   * Create menu from chapter track
   *
   * @return { import('../../menu/menu').default }
   *         New menu for the chapter buttons
   */
  createMenu() {
    this.options_.title = this.getMenuCaption();
    return super.createMenu();
  }

  /**
   * Create a menu item for each text track
   *
   * @return  { import('./text-track-menu-item').default[] }
   *         Array of menu items
   */
  createItems() {
    const items = [];
    if (!this.track_) {
      return items;
    }
    const cues = this.track_.cues;
    if (!cues) {
      return items;
    }
    for (let i = 0, l = cues.length; i < l; i++) {
      const cue = cues[i];
      const mi = new ChaptersTrackMenuItem(this.player_, {
        track: this.track_,
        cue
      });
      items.push(mi);
    }
    return items;
  }
}

/**
 * `kind` of TextTrack to look for to associate it with this menu.
 *
 * @type {string}
 * @private
 */
ChaptersButton.prototype.kind_ = 'chapters';

/**
 * The text that should display over the `ChaptersButton`s controls. Added for localization.
 *
 * @type {string}
 * @protected
 */
ChaptersButton.prototype.controlText_ = 'Chapters';
Component.registerComponent('ChaptersButton', ChaptersButton);

/**
 * @file descriptions-button.js
 */

/**
 * The button component for toggling and selecting descriptions
 *
 * @extends TextTrackButton
 */
class DescriptionsButton extends TextTrackButton {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   *
   * @param {Function} [ready]
   *        The function to call when this component is ready.
   */
  constructor(player, options, ready) {
    super(player, options, ready);
    const tracks = player.textTracks();
    const changeHandler = bind_(this, this.handleTracksChange);
    tracks.addEventListener('change', changeHandler);
    this.on('dispose', function () {
      tracks.removeEventListener('change', changeHandler);
    });
  }

  /**
   * Handle text track change
   *
   * @param {Event} event
   *        The event that caused this function to run
   *
   * @listens TextTrackList#change
   */
  handleTracksChange(event) {
    const tracks = this.player().textTracks();
    let disabled = false;

    // Check whether a track of a different kind is showing
    for (let i = 0, l = tracks.length; i < l; i++) {
      const track = tracks[i];
      if (track.kind !== this.kind_ && track.mode === 'showing') {
        disabled = true;
        break;
      }
    }

    // If another track is showing, disable this menu button
    if (disabled) {
      this.disable();
    } else {
      this.enable();
    }
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `vjs-descriptions-button ${super.buildCSSClass()}`;
  }
  buildWrapperCSSClass() {
    return `vjs-descriptions-button ${super.buildWrapperCSSClass()}`;
  }
}

/**
 * `kind` of TextTrack to look for to associate it with this menu.
 *
 * @type {string}
 * @private
 */
DescriptionsButton.prototype.kind_ = 'descriptions';

/**
 * The text that should display over the `DescriptionsButton`s controls. Added for localization.
 *
 * @type {string}
 * @protected
 */
DescriptionsButton.prototype.controlText_ = 'Descriptions';
Component.registerComponent('DescriptionsButton', DescriptionsButton);

/**
 * @file subtitles-button.js
 */

/**
 * The button component for toggling and selecting subtitles
 *
 * @extends TextTrackButton
 */
class SubtitlesButton extends TextTrackButton {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   *
   * @param {Function} [ready]
   *        The function to call when this component is ready.
   */
  constructor(player, options, ready) {
    super(player, options, ready);
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `vjs-subtitles-button ${super.buildCSSClass()}`;
  }
  buildWrapperCSSClass() {
    return `vjs-subtitles-button ${super.buildWrapperCSSClass()}`;
  }
}

/**
 * `kind` of TextTrack to look for to associate it with this menu.
 *
 * @type {string}
 * @private
 */
SubtitlesButton.prototype.kind_ = 'subtitles';

/**
 * The text that should display over the `SubtitlesButton`s controls. Added for localization.
 *
 * @type {string}
 * @protected
 */
SubtitlesButton.prototype.controlText_ = 'Subtitles';
Component.registerComponent('SubtitlesButton', SubtitlesButton);

/**
 * @file caption-settings-menu-item.js
 */

/**
 * The menu item for caption track settings menu
 *
 * @extends TextTrackMenuItem
 */
class CaptionSettingsMenuItem extends TextTrackMenuItem {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    options.track = {
      player,
      kind: options.kind,
      label: options.kind + ' settings',
      selectable: false,
      default: false,
      mode: 'disabled'
    };

    // CaptionSettingsMenuItem has no concept of 'selected'
    options.selectable = false;
    options.name = 'CaptionSettingsMenuItem';
    super(player, options);
    this.addClass('vjs-texttrack-settings');
    this.controlText(', opens ' + options.kind + ' settings dialog');
  }

  /**
   * This gets called when an `CaptionSettingsMenuItem` is "clicked". See
   * {@link ClickableComponent} for more detailed information on what a click can be.
   *
   * @param {Event} [event]
   *        The `keydown`, `tap`, or `click` event that caused this function to be
   *        called.
   *
   * @listens tap
   * @listens click
   */
  handleClick(event) {
    this.player().getChild('textTrackSettings').open();
  }

  /**
   * Update control text and label on languagechange
   */
  handleLanguagechange() {
    this.$('.vjs-menu-item-text').textContent = this.player_.localize(this.options_.kind + ' settings');
    super.handleLanguagechange();
  }
}
Component.registerComponent('CaptionSettingsMenuItem', CaptionSettingsMenuItem);

/**
 * @file captions-button.js
 */

/**
 * The button component for toggling and selecting captions
 *
 * @extends TextTrackButton
 */
class CaptionsButton extends TextTrackButton {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   *
   * @param {Function} [ready]
   *        The function to call when this component is ready.
   */
  constructor(player, options, ready) {
    super(player, options, ready);
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `vjs-captions-button ${super.buildCSSClass()}`;
  }
  buildWrapperCSSClass() {
    return `vjs-captions-button ${super.buildWrapperCSSClass()}`;
  }

  /**
   * Create caption menu items
   *
   * @return {CaptionSettingsMenuItem[]}
   *         The array of current menu items.
   */
  createItems() {
    const items = [];
    if (!(this.player().tech_ && this.player().tech_.featuresNativeTextTracks) && this.player().getChild('textTrackSettings')) {
      items.push(new CaptionSettingsMenuItem(this.player_, {
        kind: this.kind_
      }));
      this.hideThreshold_ += 1;
    }
    return super.createItems(items);
  }
}

/**
 * `kind` of TextTrack to look for to associate it with this menu.
 *
 * @type {string}
 * @private
 */
CaptionsButton.prototype.kind_ = 'captions';

/**
 * The text that should display over the `CaptionsButton`s controls. Added for localization.
 *
 * @type {string}
 * @protected
 */
CaptionsButton.prototype.controlText_ = 'Captions';
Component.registerComponent('CaptionsButton', CaptionsButton);

/**
 * @file subs-caps-menu-item.js
 */

/**
 * SubsCapsMenuItem has an [cc] icon to distinguish captions from subtitles
 * in the SubsCapsMenu.
 *
 * @extends TextTrackMenuItem
 */
class SubsCapsMenuItem extends TextTrackMenuItem {
  createEl(type, props, attrs) {
    const el = super.createEl(type, props, attrs);
    const parentSpan = el.querySelector('.vjs-menu-item-text');
    if (this.options_.track.kind === 'captions') {
      parentSpan.appendChild(createEl('span', {
        className: 'vjs-icon-placeholder'
      }, {
        'aria-hidden': true
      }));
      parentSpan.appendChild(createEl('span', {
        className: 'vjs-control-text',
        // space added as the text will visually flow with the
        // label
        textContent: ` ${this.localize('Captions')}`
      }));
    }
    return el;
  }
}
Component.registerComponent('SubsCapsMenuItem', SubsCapsMenuItem);

/**
 * @file sub-caps-button.js
 */

/**
 * The button component for toggling and selecting captions and/or subtitles
 *
 * @extends TextTrackButton
 */
class SubsCapsButton extends TextTrackButton {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   *
   * @param {Function} [ready]
   *        The function to call when this component is ready.
   */
  constructor(player, options = {}) {
    super(player, options);

    // Although North America uses "captions" in most cases for
    // "captions and subtitles" other locales use "subtitles"
    this.label_ = 'subtitles';
    if (['en', 'en-us', 'en-ca', 'fr-ca'].indexOf(this.player_.language_) > -1) {
      this.label_ = 'captions';
    }
    this.menuButton_.controlText(toTitleCase(this.label_));
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `vjs-subs-caps-button ${super.buildCSSClass()}`;
  }
  buildWrapperCSSClass() {
    return `vjs-subs-caps-button ${super.buildWrapperCSSClass()}`;
  }

  /**
   * Create caption/subtitles menu items
   *
   * @return {CaptionSettingsMenuItem[]}
   *         The array of current menu items.
   */
  createItems() {
    let items = [];
    if (!(this.player().tech_ && this.player().tech_.featuresNativeTextTracks) && this.player().getChild('textTrackSettings')) {
      items.push(new CaptionSettingsMenuItem(this.player_, {
        kind: this.label_
      }));
      this.hideThreshold_ += 1;
    }
    items = super.createItems(items, SubsCapsMenuItem);
    return items;
  }
}

/**
 * `kind`s of TextTrack to look for to associate it with this menu.
 *
 * @type {array}
 * @private
 */
SubsCapsButton.prototype.kinds_ = ['captions', 'subtitles'];

/**
 * The text that should display over the `SubsCapsButton`s controls.
 *
 *
 * @type {string}
 * @protected
 */
SubsCapsButton.prototype.controlText_ = 'Subtitles';
Component.registerComponent('SubsCapsButton', SubsCapsButton);

/**
 * @file audio-track-menu-item.js
 */

/**
 * An {@link AudioTrack} {@link MenuItem}
 *
 * @extends MenuItem
 */
class AudioTrackMenuItem extends MenuItem {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    const track = options.track;
    const tracks = player.audioTracks();

    // Modify options for parent MenuItem class's init.
    options.label = track.label || track.language || 'Unknown';
    options.selected = track.enabled;
    super(player, options);
    this.track = track;
    this.addClass(`vjs-${track.kind}-menu-item`);
    const changeHandler = (...args) => {
      this.handleTracksChange.apply(this, args);
    };
    tracks.addEventListener('change', changeHandler);
    this.on('dispose', () => {
      tracks.removeEventListener('change', changeHandler);
    });
  }
  createEl(type, props, attrs) {
    const el = super.createEl(type, props, attrs);
    const parentSpan = el.querySelector('.vjs-menu-item-text');
    if (this.options_.track.kind === 'main-desc') {
      parentSpan.appendChild(createEl('span', {
        className: 'vjs-icon-placeholder'
      }, {
        'aria-hidden': true
      }));
      parentSpan.appendChild(createEl('span', {
        className: 'vjs-control-text',
        textContent: ' ' + this.localize('Descriptions')
      }));
    }
    return el;
  }

  /**
   * This gets called when an `AudioTrackMenuItem is "clicked". See {@link ClickableComponent}
   * for more detailed information on what a click can be.
   *
   * @param {Event} [event]
   *        The `keydown`, `tap`, or `click` event that caused this function to be
   *        called.
   *
   * @listens tap
   * @listens click
   */
  handleClick(event) {
    super.handleClick(event);

    // the audio track list will automatically toggle other tracks
    // off for us.
    this.track.enabled = true;

    // when native audio tracks are used, we want to make sure that other tracks are turned off
    if (this.player_.tech_.featuresNativeAudioTracks) {
      const tracks = this.player_.audioTracks();
      for (let i = 0; i < tracks.length; i++) {
        const track = tracks[i];

        // skip the current track since we enabled it above
        if (track === this.track) {
          continue;
        }
        track.enabled = track === this.track;
      }
    }
  }

  /**
   * Handle any {@link AudioTrack} change.
   *
   * @param {Event} [event]
   *        The {@link AudioTrackList#change} event that caused this to run.
   *
   * @listens AudioTrackList#change
   */
  handleTracksChange(event) {
    this.selected(this.track.enabled);
  }
}
Component.registerComponent('AudioTrackMenuItem', AudioTrackMenuItem);

/**
 * @file audio-track-button.js
 */

/**
 * The base class for buttons that toggle specific {@link AudioTrack} types.
 *
 * @extends TrackButton
 */
class AudioTrackButton extends TrackButton {
  /**
   * Creates an instance of this class.
   *
   * @param {Player} player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options={}]
   *        The key/value store of player options.
   */
  constructor(player, options = {}) {
    options.tracks = player.audioTracks();
    super(player, options);
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `vjs-audio-button ${super.buildCSSClass()}`;
  }
  buildWrapperCSSClass() {
    return `vjs-audio-button ${super.buildWrapperCSSClass()}`;
  }

  /**
   * Create a menu item for each audio track
   *
   * @param {AudioTrackMenuItem[]} [items=[]]
   *        An array of existing menu items to use.
   *
   * @return {AudioTrackMenuItem[]}
   *         An array of menu items
   */
  createItems(items = []) {
    // if there's only one audio track, there no point in showing it
    this.hideThreshold_ = 1;
    const tracks = this.player_.audioTracks();
    for (let i = 0; i < tracks.length; i++) {
      const track = tracks[i];
      items.push(new AudioTrackMenuItem(this.player_, {
        track,
        // MenuItem is selectable
        selectable: true,
        // MenuItem is NOT multiSelectable (i.e. only one can be marked "selected" at a time)
        multiSelectable: false
      }));
    }
    return items;
  }
}

/**
 * The text that should display over the `AudioTrackButton`s controls. Added for localization.
 *
 * @type {string}
 * @protected
 */
AudioTrackButton.prototype.controlText_ = 'Audio Track';
Component.registerComponent('AudioTrackButton', AudioTrackButton);

/**
 * @file playback-rate-menu-item.js
 */

/**
 * The specific menu item type for selecting a playback rate.
 *
 * @extends MenuItem
 */
class PlaybackRateMenuItem extends MenuItem {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    const label = options.rate;
    const rate = parseFloat(label, 10);

    // Modify options for parent MenuItem class's init.
    options.label = label;
    options.selected = rate === player.playbackRate();
    options.selectable = true;
    options.multiSelectable = false;
    super(player, options);
    this.label = label;
    this.rate = rate;
    this.on(player, 'ratechange', e => this.update(e));
  }

  /**
   * This gets called when an `PlaybackRateMenuItem` is "clicked". See
   * {@link ClickableComponent} for more detailed information on what a click can be.
   *
   * @param {Event} [event]
   *        The `keydown`, `tap`, or `click` event that caused this function to be
   *        called.
   *
   * @listens tap
   * @listens click
   */
  handleClick(event) {
    super.handleClick();
    this.player().playbackRate(this.rate);
  }

  /**
   * Update the PlaybackRateMenuItem when the playbackrate changes.
   *
   * @param {Event} [event]
   *        The `ratechange` event that caused this function to run.
   *
   * @listens Player#ratechange
   */
  update(event) {
    this.selected(this.player().playbackRate() === this.rate);
  }
}

/**
 * The text that should display over the `PlaybackRateMenuItem`s controls. Added for localization.
 *
 * @type {string}
 * @private
 */
PlaybackRateMenuItem.prototype.contentElType = 'button';
Component.registerComponent('PlaybackRateMenuItem', PlaybackRateMenuItem);

/**
 * @file playback-rate-menu-button.js
 */

/**
 * The component for controlling the playback rate.
 *
 * @extends MenuButton
 */
class PlaybackRateMenuButton extends MenuButton {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../../player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.menuButton_.el_.setAttribute('aria-describedby', this.labelElId_);
    this.updateVisibility();
    this.updateLabel();
    this.on(player, 'loadstart', e => this.updateVisibility(e));
    this.on(player, 'ratechange', e => this.updateLabel(e));
    this.on(player, 'playbackrateschange', e => this.handlePlaybackRateschange(e));
  }

  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    const el = super.createEl();
    this.labelElId_ = 'vjs-playback-rate-value-label-' + this.id_;
    this.labelEl_ = createEl('div', {
      className: 'vjs-playback-rate-value',
      id: this.labelElId_,
      textContent: '1x'
    });
    el.appendChild(this.labelEl_);
    return el;
  }
  dispose() {
    this.labelEl_ = null;
    super.dispose();
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `vjs-playback-rate ${super.buildCSSClass()}`;
  }
  buildWrapperCSSClass() {
    return `vjs-playback-rate ${super.buildWrapperCSSClass()}`;
  }

  /**
   * Create the list of menu items. Specific to each subclass.
   *
   */
  createItems() {
    const rates = this.playbackRates();
    const items = [];
    for (let i = rates.length - 1; i >= 0; i--) {
      items.push(new PlaybackRateMenuItem(this.player(), {
        rate: rates[i] + 'x'
      }));
    }
    return items;
  }

  /**
   * On playbackrateschange, update the menu to account for the new items.
   *
   * @listens Player#playbackrateschange
   */
  handlePlaybackRateschange(event) {
    this.update();
  }

  /**
   * Get possible playback rates
   *
   * @return {Array}
   *         All possible playback rates
   */
  playbackRates() {
    const player = this.player();
    return player.playbackRates && player.playbackRates() || [];
  }

  /**
   * Get whether playback rates is supported by the tech
   * and an array of playback rates exists
   *
   * @return {boolean}
   *         Whether changing playback rate is supported
   */
  playbackRateSupported() {
    return this.player().tech_ && this.player().tech_.featuresPlaybackRate && this.playbackRates() && this.playbackRates().length > 0;
  }

  /**
   * Hide playback rate controls when they're no playback rate options to select
   *
   * @param {Event} [event]
   *        The event that caused this function to run.
   *
   * @listens Player#loadstart
   */
  updateVisibility(event) {
    if (this.playbackRateSupported()) {
      this.removeClass('vjs-hidden');
    } else {
      this.addClass('vjs-hidden');
    }
  }

  /**
   * Update button label when rate changed
   *
   * @param {Event} [event]
   *        The event that caused this function to run.
   *
   * @listens Player#ratechange
   */
  updateLabel(event) {
    if (this.playbackRateSupported()) {
      this.labelEl_.textContent = this.player().playbackRate() + 'x';
    }
  }
}

/**
 * The text that should display over the `PlaybackRateMenuButton`s controls.
 *
 * Added for localization.
 *
 * @type {string}
 * @protected
 */
PlaybackRateMenuButton.prototype.controlText_ = 'Playback Rate';
Component.registerComponent('PlaybackRateMenuButton', PlaybackRateMenuButton);

/**
 * @file spacer.js
 */

/**
 * Just an empty spacer element that can be used as an append point for plugins, etc.
 * Also can be used to create space between elements when necessary.
 *
 * @extends Component
 */
class Spacer extends Component {
  /**
  * Builds the default DOM `className`.
  *
  * @return {string}
  *         The DOM `className` for this object.
  */
  buildCSSClass() {
    return `vjs-spacer ${super.buildCSSClass()}`;
  }

  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl(tag = 'div', props = {}, attributes = {}) {
    if (!props.className) {
      props.className = this.buildCSSClass();
    }
    return super.createEl(tag, props, attributes);
  }
}
Component.registerComponent('Spacer', Spacer);

/**
 * @file custom-control-spacer.js
 */

/**
 * Spacer specifically meant to be used as an insertion point for new plugins, etc.
 *
 * @extends Spacer
 */
class CustomControlSpacer extends Spacer {
  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   */
  buildCSSClass() {
    return `vjs-custom-control-spacer ${super.buildCSSClass()}`;
  }

  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    return super.createEl('div', {
      className: this.buildCSSClass(),
      // No-flex/table-cell mode requires there be some content
      // in the cell to fill the remaining space of the table.
      textContent: '\u00a0'
    });
  }
}
Component.registerComponent('CustomControlSpacer', CustomControlSpacer);

/**
 * @file control-bar.js
 */

/**
 * Container of main controls.
 *
 * @extends Component
 */
class ControlBar extends Component {
  /**
   * Create the `Component`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    return super.createEl('div', {
      className: 'vjs-control-bar',
      dir: 'ltr'
    });
  }
}

/**
 * Default options for `ControlBar`
 *
 * @type {Object}
 * @private
 */
ControlBar.prototype.options_ = {
  children: ['playToggle', 'skipBackward', 'skipForward', 'volumePanel', 'currentTimeDisplay', 'timeDivider', 'durationDisplay', 'progressControl', 'liveDisplay', 'seekToLive', 'remainingTimeDisplay', 'customControlSpacer', 'playbackRateMenuButton', 'chaptersButton', 'descriptionsButton', 'subsCapsButton', 'audioTrackButton', 'fullscreenToggle']
};
if ('exitPictureInPicture' in document) {
  ControlBar.prototype.options_.children.splice(ControlBar.prototype.options_.children.length - 1, 0, 'pictureInPictureToggle');
}
Component.registerComponent('ControlBar', ControlBar);

/**
 * @file error-display.js
 */

/**
 * A display that indicates an error has occurred. This means that the video
 * is unplayable.
 *
 * @extends ModalDialog
 */
class ErrorDisplay extends ModalDialog {
  /**
   * Creates an instance of this class.
   *
   * @param  { import('./player').default } player
   *         The `Player` that this class should be attached to.
   *
   * @param  {Object} [options]
   *         The key/value store of player options.
   */
  constructor(player, options) {
    super(player, options);
    this.on(player, 'error', e => this.open(e));
  }

  /**
   * Builds the default DOM `className`.
   *
   * @return {string}
   *         The DOM `className` for this object.
   *
   * @deprecated Since version 5.
   */
  buildCSSClass() {
    return `vjs-error-display ${super.buildCSSClass()}`;
  }

  /**
   * Gets the localized error message based on the `Player`s error.
   *
   * @return {string}
   *         The `Player`s error message localized or an empty string.
   */
  content() {
    const error = this.player().error();
    return error ? this.localize(error.message) : '';
  }
}

/**
 * The default options for an `ErrorDisplay`.
 *
 * @private
 */
ErrorDisplay.prototype.options_ = Object.assign({}, ModalDialog.prototype.options_, {
  pauseOnOpen: false,
  fillAlways: true,
  temporary: false,
  uncloseable: true
});
Component.registerComponent('ErrorDisplay', ErrorDisplay);

/**
 * @file text-track-settings.js
 */
const LOCAL_STORAGE_KEY = 'vjs-text-track-settings';
const COLOR_BLACK = ['#000', 'Black'];
const COLOR_BLUE = ['#00F', 'Blue'];
const COLOR_CYAN = ['#0FF', 'Cyan'];
const COLOR_GREEN = ['#0F0', 'Green'];
const COLOR_MAGENTA = ['#F0F', 'Magenta'];
const COLOR_RED = ['#F00', 'Red'];
const COLOR_WHITE = ['#FFF', 'White'];
const COLOR_YELLOW = ['#FF0', 'Yellow'];
const OPACITY_OPAQUE = ['1', 'Opaque'];
const OPACITY_SEMI = ['0.5', 'Semi-Transparent'];
const OPACITY_TRANS = ['0', 'Transparent'];

// Configuration for the various <select> elements in the DOM of this component.
//
// Possible keys include:
//
// `default`:
//   The default option index. Only needs to be provided if not zero.
// `parser`:
//   A function which is used to parse the value from the selected option in
//   a customized way.
// `selector`:
//   The selector used to find the associated <select> element.
const selectConfigs = {
  backgroundColor: {
    selector: '.vjs-bg-color > select',
    id: 'captions-background-color-%s',
    label: 'Color',
    options: [COLOR_BLACK, COLOR_WHITE, COLOR_RED, COLOR_GREEN, COLOR_BLUE, COLOR_YELLOW, COLOR_MAGENTA, COLOR_CYAN]
  },
  backgroundOpacity: {
    selector: '.vjs-bg-opacity > select',
    id: 'captions-background-opacity-%s',
    label: 'Opacity',
    options: [OPACITY_OPAQUE, OPACITY_SEMI, OPACITY_TRANS]
  },
  color: {
    selector: '.vjs-text-color > select',
    id: 'captions-foreground-color-%s',
    label: 'Color',
    options: [COLOR_WHITE, COLOR_BLACK, COLOR_RED, COLOR_GREEN, COLOR_BLUE, COLOR_YELLOW, COLOR_MAGENTA, COLOR_CYAN]
  },
  edgeStyle: {
    selector: '.vjs-edge-style > select',
    id: '%s',
    label: 'Text Edge Style',
    options: [['none', 'None'], ['raised', 'Raised'], ['depressed', 'Depressed'], ['uniform', 'Uniform'], ['dropshadow', 'Dropshadow']]
  },
  fontFamily: {
    selector: '.vjs-font-family > select',
    id: 'captions-font-family-%s',
    label: 'Font Family',
    options: [['proportionalSansSerif', 'Proportional Sans-Serif'], ['monospaceSansSerif', 'Monospace Sans-Serif'], ['proportionalSerif', 'Proportional Serif'], ['monospaceSerif', 'Monospace Serif'], ['casual', 'Casual'], ['script', 'Script'], ['small-caps', 'Small Caps']]
  },
  fontPercent: {
    selector: '.vjs-font-percent > select',
    id: 'captions-font-size-%s',
    label: 'Font Size',
    options: [['0.50', '50%'], ['0.75', '75%'], ['1.00', '100%'], ['1.25', '125%'], ['1.50', '150%'], ['1.75', '175%'], ['2.00', '200%'], ['3.00', '300%'], ['4.00', '400%']],
    default: 2,
    parser: v => v === '1.00' ? null : Number(v)
  },
  textOpacity: {
    selector: '.vjs-text-opacity > select',
    id: 'captions-foreground-opacity-%s',
    label: 'Opacity',
    options: [OPACITY_OPAQUE, OPACITY_SEMI]
  },
  // Options for this object are defined below.
  windowColor: {
    selector: '.vjs-window-color > select',
    id: 'captions-window-color-%s',
    label: 'Color'
  },
  // Options for this object are defined below.
  windowOpacity: {
    selector: '.vjs-window-opacity > select',
    id: 'captions-window-opacity-%s',
    label: 'Opacity',
    options: [OPACITY_TRANS, OPACITY_SEMI, OPACITY_OPAQUE]
  }
};
selectConfigs.windowColor.options = selectConfigs.backgroundColor.options;

/**
 * Get the actual value of an option.
 *
 * @param  {string} value
 *         The value to get
 *
 * @param  {Function} [parser]
 *         Optional function to adjust the value.
 *
 * @return {*}
 *         - Will be `undefined` if no value exists
 *         - Will be `undefined` if the given value is "none".
 *         - Will be the actual value otherwise.
 *
 * @private
 */
function parseOptionValue(value, parser) {
  if (parser) {
    value = parser(value);
  }
  if (value && value !== 'none') {
    return value;
  }
}

/**
 * Gets the value of the selected <option> element within a <select> element.
 *
 * @param  {Element} el
 *         the element to look in
 *
 * @param  {Function} [parser]
 *         Optional function to adjust the value.
 *
 * @return {*}
 *         - Will be `undefined` if no value exists
 *         - Will be `undefined` if the given value is "none".
 *         - Will be the actual value otherwise.
 *
 * @private
 */
function getSelectedOptionValue(el, parser) {
  const value = el.options[el.options.selectedIndex].value;
  return parseOptionValue(value, parser);
}

/**
 * Sets the selected <option> element within a <select> element based on a
 * given value.
 *
 * @param {Element} el
 *        The element to look in.
 *
 * @param {string} value
 *        the property to look on.
 *
 * @param {Function} [parser]
 *        Optional function to adjust the value before comparing.
 *
 * @private
 */
function setSelectedOption(el, value, parser) {
  if (!value) {
    return;
  }
  for (let i = 0; i < el.options.length; i++) {
    if (parseOptionValue(el.options[i].value, parser) === value) {
      el.selectedIndex = i;
      break;
    }
  }
}

/**
 * Manipulate Text Tracks settings.
 *
 * @extends ModalDialog
 */
class TextTrackSettings extends ModalDialog {
  /**
   * Creates an instance of this class.
   *
   * @param { import('../player').default } player
   *         The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *         The key/value store of player options.
   */
  constructor(player, options) {
    options.temporary = false;
    super(player, options);
    this.updateDisplay = this.updateDisplay.bind(this);

    // fill the modal and pretend we have opened it
    this.fill();
    this.hasBeenOpened_ = this.hasBeenFilled_ = true;
    this.endDialog = createEl('p', {
      className: 'vjs-control-text',
      textContent: this.localize('End of dialog window.')
    });
    this.el().appendChild(this.endDialog);
    this.setDefaults();

    // Grab `persistTextTrackSettings` from the player options if not passed in child options
    if (options.persistTextTrackSettings === undefined) {
      this.options_.persistTextTrackSettings = this.options_.playerOptions.persistTextTrackSettings;
    }
    this.on(this.$('.vjs-done-button'), 'click', () => {
      this.saveSettings();
      this.close();
    });
    this.on(this.$('.vjs-default-button'), 'click', () => {
      this.setDefaults();
      this.updateDisplay();
    });
    each(selectConfigs, config => {
      this.on(this.$(config.selector), 'change', this.updateDisplay);
    });
    if (this.options_.persistTextTrackSettings) {
      this.restoreSettings();
    }
  }
  dispose() {
    this.endDialog = null;
    super.dispose();
  }

  /**
   * Create a <select> element with configured options.
   *
   * @param {string} key
   *        Configuration key to use during creation.
   *
   * @return {string}
   *         An HTML string.
   *
   * @private
   */
  createElSelect_(key, legendId = '', type = 'label') {
    const config = selectConfigs[key];
    const id = config.id.replace('%s', this.id_);
    const selectLabelledbyIds = [legendId, id].join(' ').trim();
    return [`<${type} id="${id}" class="${type === 'label' ? 'vjs-label' : ''}">`, this.localize(config.label), `</${type}>`, `<select aria-labelledby="${selectLabelledbyIds}">`].concat(config.options.map(o => {
      const optionId = id + '-' + o[1].replace(/\W+/g, '');
      return [`<option id="${optionId}" value="${o[0]}" `, `aria-labelledby="${selectLabelledbyIds} ${optionId}">`, this.localize(o[1]), '</option>'].join('');
    })).concat('</select>').join('');
  }

  /**
   * Create foreground color element for the component
   *
   * @return {string}
   *         An HTML string.
   *
   * @private
   */
  createElFgColor_() {
    const legendId = `captions-text-legend-${this.id_}`;
    return ['<fieldset class="vjs-fg vjs-track-setting">', `<legend id="${legendId}">`, this.localize('Text'), '</legend>', '<span class="vjs-text-color">', this.createElSelect_('color', legendId), '</span>', '<span class="vjs-text-opacity vjs-opacity">', this.createElSelect_('textOpacity', legendId), '</span>', '</fieldset>'].join('');
  }

  /**
   * Create background color element for the component
   *
   * @return {string}
   *         An HTML string.
   *
   * @private
   */
  createElBgColor_() {
    const legendId = `captions-background-${this.id_}`;
    return ['<fieldset class="vjs-bg vjs-track-setting">', `<legend id="${legendId}">`, this.localize('Text Background'), '</legend>', '<span class="vjs-bg-color">', this.createElSelect_('backgroundColor', legendId), '</span>', '<span class="vjs-bg-opacity vjs-opacity">', this.createElSelect_('backgroundOpacity', legendId), '</span>', '</fieldset>'].join('');
  }

  /**
   * Create window color element for the component
   *
   * @return {string}
   *         An HTML string.
   *
   * @private
   */
  createElWinColor_() {
    const legendId = `captions-window-${this.id_}`;
    return ['<fieldset class="vjs-window vjs-track-setting">', `<legend id="${legendId}">`, this.localize('Caption Area Background'), '</legend>', '<span class="vjs-window-color">', this.createElSelect_('windowColor', legendId), '</span>', '<span class="vjs-window-opacity vjs-opacity">', this.createElSelect_('windowOpacity', legendId), '</span>', '</fieldset>'].join('');
  }

  /**
   * Create color elements for the component
   *
   * @return {Element}
   *         The element that was created
   *
   * @private
   */
  createElColors_() {
    return createEl('div', {
      className: 'vjs-track-settings-colors',
      innerHTML: [this.createElFgColor_(), this.createElBgColor_(), this.createElWinColor_()].join('')
    });
  }

  /**
   * Create font elements for the component
   *
   * @return {Element}
   *         The element that was created.
   *
   * @private
   */
  createElFont_() {
    return createEl('div', {
      className: 'vjs-track-settings-font',
      innerHTML: ['<fieldset class="vjs-font-percent vjs-track-setting">', this.createElSelect_('fontPercent', '', 'legend'), '</fieldset>', '<fieldset class="vjs-edge-style vjs-track-setting">', this.createElSelect_('edgeStyle', '', 'legend'), '</fieldset>', '<fieldset class="vjs-font-family vjs-track-setting">', this.createElSelect_('fontFamily', '', 'legend'), '</fieldset>'].join('')
    });
  }

  /**
   * Create controls for the component
   *
   * @return {Element}
   *         The element that was created.
   *
   * @private
   */
  createElControls_() {
    const defaultsDescription = this.localize('restore all settings to the default values');
    return createEl('div', {
      className: 'vjs-track-settings-controls',
      innerHTML: [`<button type="button" class="vjs-default-button" title="${defaultsDescription}">`, this.localize('Reset'), `<span class="vjs-control-text"> ${defaultsDescription}</span>`, '</button>', `<button type="button" class="vjs-done-button">${this.localize('Done')}</button>`].join('')
    });
  }
  content() {
    return [this.createElColors_(), this.createElFont_(), this.createElControls_()];
  }
  label() {
    return this.localize('Caption Settings Dialog');
  }
  description() {
    return this.localize('Beginning of dialog window. Escape will cancel and close the window.');
  }
  buildCSSClass() {
    return super.buildCSSClass() + ' vjs-text-track-settings';
  }

  /**
   * Gets an object of text track settings (or null).
   *
   * @return {Object}
   *         An object with config values parsed from the DOM or localStorage.
   */
  getValues() {
    return reduce(selectConfigs, (accum, config, key) => {
      const value = getSelectedOptionValue(this.$(config.selector), config.parser);
      if (value !== undefined) {
        accum[key] = value;
      }
      return accum;
    }, {});
  }

  /**
   * Sets text track settings from an object of values.
   *
   * @param {Object} values
   *        An object with config values parsed from the DOM or localStorage.
   */
  setValues(values) {
    each(selectConfigs, (config, key) => {
      setSelectedOption(this.$(config.selector), values[key], config.parser);
    });
  }

  /**
   * Sets all `<select>` elements to their default values.
   */
  setDefaults() {
    each(selectConfigs, config => {
      const index = config.hasOwnProperty('default') ? config.default : 0;
      this.$(config.selector).selectedIndex = index;
    });
  }

  /**
   * Restore texttrack settings from localStorage
   */
  restoreSettings() {
    let values;
    try {
      values = JSON.parse(window.localStorage.getItem(LOCAL_STORAGE_KEY));
    } catch (err) {
      log.warn(err);
    }
    if (values) {
      this.setValues(values);
    }
  }

  /**
   * Save text track settings to localStorage
   */
  saveSettings() {
    if (!this.options_.persistTextTrackSettings) {
      return;
    }
    const values = this.getValues();
    try {
      if (Object.keys(values).length) {
        window.localStorage.setItem(LOCAL_STORAGE_KEY, JSON.stringify(values));
      } else {
        window.localStorage.removeItem(LOCAL_STORAGE_KEY);
      }
    } catch (err) {
      log.warn(err);
    }
  }

  /**
   * Update display of text track settings
   */
  updateDisplay() {
    const ttDisplay = this.player_.getChild('textTrackDisplay');
    if (ttDisplay) {
      ttDisplay.updateDisplay();
    }
  }

  /**
   * conditionally blur the element and refocus the captions button
   *
   * @private
   */
  conditionalBlur_() {
    this.previouslyActiveEl_ = null;
    const cb = this.player_.controlBar;
    const subsCapsBtn = cb && cb.subsCapsButton;
    const ccBtn = cb && cb.captionsButton;
    if (subsCapsBtn) {
      subsCapsBtn.focus();
    } else if (ccBtn) {
      ccBtn.focus();
    }
  }

  /**
   * Repopulate dialog with new localizations on languagechange
   */
  handleLanguagechange() {
    this.fill();
  }
}
Component.registerComponent('TextTrackSettings', TextTrackSettings);

/**
 * @file resize-manager.js
 */

/**
 * A Resize Manager. It is in charge of triggering `playerresize` on the player in the right conditions.
 *
 * It'll either create an iframe and use a debounced resize handler on it or use the new {@link https://wicg.github.io/ResizeObserver/|ResizeObserver}.
 *
 * If the ResizeObserver is available natively, it will be used. A polyfill can be passed in as an option.
 * If a `playerresize` event is not needed, the ResizeManager component can be removed from the player, see the example below.
 *
 * @example <caption>How to disable the resize manager</caption>
 * const player = videojs('#vid', {
 *   resizeManager: false
 * });
 *
 * @see {@link https://wicg.github.io/ResizeObserver/|ResizeObserver specification}
 *
 * @extends Component
 */
class ResizeManager extends Component {
  /**
   * Create the ResizeManager.
   *
   * @param {Object} player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of ResizeManager options.
   *
   * @param {Object} [options.ResizeObserver]
   *        A polyfill for ResizeObserver can be passed in here.
   *        If this is set to null it will ignore the native ResizeObserver and fall back to the iframe fallback.
   */
  constructor(player, options) {
    let RESIZE_OBSERVER_AVAILABLE = options.ResizeObserver || window.ResizeObserver;

    // if `null` was passed, we want to disable the ResizeObserver
    if (options.ResizeObserver === null) {
      RESIZE_OBSERVER_AVAILABLE = false;
    }

    // Only create an element when ResizeObserver isn't available
    const options_ = merge({
      createEl: !RESIZE_OBSERVER_AVAILABLE,
      reportTouchActivity: false
    }, options);
    super(player, options_);
    this.ResizeObserver = options.ResizeObserver || window.ResizeObserver;
    this.loadListener_ = null;
    this.resizeObserver_ = null;
    this.debouncedHandler_ = debounce(() => {
      this.resizeHandler();
    }, 100, false, this);
    if (RESIZE_OBSERVER_AVAILABLE) {
      this.resizeObserver_ = new this.ResizeObserver(this.debouncedHandler_);
      this.resizeObserver_.observe(player.el());
    } else {
      this.loadListener_ = () => {
        if (!this.el_ || !this.el_.contentWindow) {
          return;
        }
        const debouncedHandler_ = this.debouncedHandler_;
        let unloadListener_ = this.unloadListener_ = function () {
          off(this, 'resize', debouncedHandler_);
          off(this, 'unload', unloadListener_);
          unloadListener_ = null;
        };

        // safari and edge can unload the iframe before resizemanager dispose
        // we have to dispose of event handlers correctly before that happens
        on(this.el_.contentWindow, 'unload', unloadListener_);
        on(this.el_.contentWindow, 'resize', debouncedHandler_);
      };
      this.one('load', this.loadListener_);
    }
  }
  createEl() {
    return super.createEl('iframe', {
      className: 'vjs-resize-manager',
      tabIndex: -1,
      title: this.localize('No content')
    }, {
      'aria-hidden': 'true'
    });
  }

  /**
   * Called when a resize is triggered on the iframe or a resize is observed via the ResizeObserver
   *
   * @fires Player#playerresize
   */
  resizeHandler() {
    /**
     * Called when the player size has changed
     *
     * @event Player#playerresize
     * @type {Event}
     */
    // make sure player is still around to trigger
    // prevents this from causing an error after dispose
    if (!this.player_ || !this.player_.trigger) {
      return;
    }
    this.player_.trigger('playerresize');
  }
  dispose() {
    if (this.debouncedHandler_) {
      this.debouncedHandler_.cancel();
    }
    if (this.resizeObserver_) {
      if (this.player_.el()) {
        this.resizeObserver_.unobserve(this.player_.el());
      }
      this.resizeObserver_.disconnect();
    }
    if (this.loadListener_) {
      this.off('load', this.loadListener_);
    }
    if (this.el_ && this.el_.contentWindow && this.unloadListener_) {
      this.unloadListener_.call(this.el_.contentWindow);
    }
    this.ResizeObserver = null;
    this.resizeObserver = null;
    this.debouncedHandler_ = null;
    this.loadListener_ = null;
    super.dispose();
  }
}
Component.registerComponent('ResizeManager', ResizeManager);

const defaults = {
  trackingThreshold: 20,
  liveTolerance: 15
};

/*
  track when we are at the live edge, and other helpers for live playback */

/**
 * A class for checking live current time and determining when the player
 * is at or behind the live edge.
 */
class LiveTracker extends Component {
  /**
   * Creates an instance of this class.
   *
   * @param { import('./player').default } player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   *
   * @param {number} [options.trackingThreshold=20]
   *        Number of seconds of live window (seekableEnd - seekableStart) that
   *        media needs to have before the liveui will be shown.
   *
   * @param {number} [options.liveTolerance=15]
   *        Number of seconds behind live that we have to be
   *        before we will be considered non-live. Note that this will only
   *        be used when playing at the live edge. This allows large seekable end
   *        changes to not effect whether we are live or not.
   */
  constructor(player, options) {
    // LiveTracker does not need an element
    const options_ = merge(defaults, options, {
      createEl: false
    });
    super(player, options_);
    this.trackLiveHandler_ = () => this.trackLive_();
    this.handlePlay_ = e => this.handlePlay(e);
    this.handleFirstTimeupdate_ = e => this.handleFirstTimeupdate(e);
    this.handleSeeked_ = e => this.handleSeeked(e);
    this.seekToLiveEdge_ = e => this.seekToLiveEdge(e);
    this.reset_();
    this.on(this.player_, 'durationchange', e => this.handleDurationchange(e));
    // we should try to toggle tracking on canplay as native playback engines, like Safari
    // may not have the proper values for things like seekableEnd until then
    this.on(this.player_, 'canplay', () => this.toggleTracking());
  }

  /**
   * all the functionality for tracking when seek end changes
   * and for tracking how far past seek end we should be
   */
  trackLive_() {
    const seekable = this.player_.seekable();

    // skip undefined seekable
    if (!seekable || !seekable.length) {
      return;
    }
    const newTime = Number(window.performance.now().toFixed(4));
    const deltaTime = this.lastTime_ === -1 ? 0 : (newTime - this.lastTime_) / 1000;
    this.lastTime_ = newTime;
    this.pastSeekEnd_ = this.pastSeekEnd() + deltaTime;
    const liveCurrentTime = this.liveCurrentTime();
    const currentTime = this.player_.currentTime();

    // we are behind live if any are true
    // 1. the player is paused
    // 2. the user seeked to a location 2 seconds away from live
    // 3. the difference between live and current time is greater
    //    liveTolerance which defaults to 15s
    let isBehind = this.player_.paused() || this.seekedBehindLive_ || Math.abs(liveCurrentTime - currentTime) > this.options_.liveTolerance;

    // we cannot be behind if
    // 1. until we have not seen a timeupdate yet
    // 2. liveCurrentTime is Infinity, which happens on Android and Native Safari
    if (!this.timeupdateSeen_ || liveCurrentTime === Infinity) {
      isBehind = false;
    }
    if (isBehind !== this.behindLiveEdge_) {
      this.behindLiveEdge_ = isBehind;
      this.trigger('liveedgechange');
    }
  }

  /**
   * handle a durationchange event on the player
   * and start/stop tracking accordingly.
   */
  handleDurationchange() {
    this.toggleTracking();
  }

  /**
   * start/stop tracking
   */
  toggleTracking() {
    if (this.player_.duration() === Infinity && this.liveWindow() >= this.options_.trackingThreshold) {
      if (this.player_.options_.liveui) {
        this.player_.addClass('vjs-liveui');
      }
      this.startTracking();
    } else {
      this.player_.removeClass('vjs-liveui');
      this.stopTracking();
    }
  }

  /**
   * start tracking live playback
   */
  startTracking() {
    if (this.isTracking()) {
      return;
    }

    // If we haven't seen a timeupdate, we need to check whether playback
    // began before this component started tracking. This can happen commonly
    // when using autoplay.
    if (!this.timeupdateSeen_) {
      this.timeupdateSeen_ = this.player_.hasStarted();
    }
    this.trackingInterval_ = this.setInterval(this.trackLiveHandler_, UPDATE_REFRESH_INTERVAL);
    this.trackLive_();
    this.on(this.player_, ['play', 'pause'], this.trackLiveHandler_);
    if (!this.timeupdateSeen_) {
      this.one(this.player_, 'play', this.handlePlay_);
      this.one(this.player_, 'timeupdate', this.handleFirstTimeupdate_);
    } else {
      this.on(this.player_, 'seeked', this.handleSeeked_);
    }
  }

  /**
   * handle the first timeupdate on the player if it wasn't already playing
   * when live tracker started tracking.
   */
  handleFirstTimeupdate() {
    this.timeupdateSeen_ = true;
    this.on(this.player_, 'seeked', this.handleSeeked_);
  }

  /**
   * Keep track of what time a seek starts, and listen for seeked
   * to find where a seek ends.
   */
  handleSeeked() {
    const timeDiff = Math.abs(this.liveCurrentTime() - this.player_.currentTime());
    this.seekedBehindLive_ = this.nextSeekedFromUser_ && timeDiff > 2;
    this.nextSeekedFromUser_ = false;
    this.trackLive_();
  }

  /**
   * handle the first play on the player, and make sure that we seek
   * right to the live edge.
   */
  handlePlay() {
    this.one(this.player_, 'timeupdate', this.seekToLiveEdge_);
  }

  /**
   * Stop tracking, and set all internal variables to
   * their initial value.
   */
  reset_() {
    this.lastTime_ = -1;
    this.pastSeekEnd_ = 0;
    this.lastSeekEnd_ = -1;
    this.behindLiveEdge_ = true;
    this.timeupdateSeen_ = false;
    this.seekedBehindLive_ = false;
    this.nextSeekedFromUser_ = false;
    this.clearInterval(this.trackingInterval_);
    this.trackingInterval_ = null;
    this.off(this.player_, ['play', 'pause'], this.trackLiveHandler_);
    this.off(this.player_, 'seeked', this.handleSeeked_);
    this.off(this.player_, 'play', this.handlePlay_);
    this.off(this.player_, 'timeupdate', this.handleFirstTimeupdate_);
    this.off(this.player_, 'timeupdate', this.seekToLiveEdge_);
  }

  /**
   * The next seeked event is from the user. Meaning that any seek
   * > 2s behind live will be considered behind live for real and
   * liveTolerance will be ignored.
   */
  nextSeekedFromUser() {
    this.nextSeekedFromUser_ = true;
  }

  /**
   * stop tracking live playback
   */
  stopTracking() {
    if (!this.isTracking()) {
      return;
    }
    this.reset_();
    this.trigger('liveedgechange');
  }

  /**
   * A helper to get the player seekable end
   * so that we don't have to null check everywhere
   *
   * @return {number}
   *         The furthest seekable end or Infinity.
   */
  seekableEnd() {
    const seekable = this.player_.seekable();
    const seekableEnds = [];
    let i = seekable ? seekable.length : 0;
    while (i--) {
      seekableEnds.push(seekable.end(i));
    }

    // grab the furthest seekable end after sorting, or if there are none
    // default to Infinity
    return seekableEnds.length ? seekableEnds.sort()[seekableEnds.length - 1] : Infinity;
  }

  /**
   * A helper to get the player seekable start
   * so that we don't have to null check everywhere
   *
   * @return {number}
   *         The earliest seekable start or 0.
   */
  seekableStart() {
    const seekable = this.player_.seekable();
    const seekableStarts = [];
    let i = seekable ? seekable.length : 0;
    while (i--) {
      seekableStarts.push(seekable.start(i));
    }

    // grab the first seekable start after sorting, or if there are none
    // default to 0
    return seekableStarts.length ? seekableStarts.sort()[0] : 0;
  }

  /**
   * Get the live time window aka
   * the amount of time between seekable start and
   * live current time.
   *
   * @return {number}
   *         The amount of seconds that are seekable in
   *         the live video.
   */
  liveWindow() {
    const liveCurrentTime = this.liveCurrentTime();

    // if liveCurrenTime is Infinity then we don't have a liveWindow at all
    if (liveCurrentTime === Infinity) {
      return 0;
    }
    return liveCurrentTime - this.seekableStart();
  }

  /**
   * Determines if the player is live, only checks if this component
   * is tracking live playback or not
   *
   * @return {boolean}
   *         Whether liveTracker is tracking
   */
  isLive() {
    return this.isTracking();
  }

  /**
   * Determines if currentTime is at the live edge and won't fall behind
   * on each seekableendchange
   *
   * @return {boolean}
   *         Whether playback is at the live edge
   */
  atLiveEdge() {
    return !this.behindLiveEdge();
  }

  /**
   * get what we expect the live current time to be
   *
   * @return {number}
   *         The expected live current time
   */
  liveCurrentTime() {
    return this.pastSeekEnd() + this.seekableEnd();
  }

  /**
   * The number of seconds that have occurred after seekable end
   * changed. This will be reset to 0 once seekable end changes.
   *
   * @return {number}
   *         Seconds past the current seekable end
   */
  pastSeekEnd() {
    const seekableEnd = this.seekableEnd();
    if (this.lastSeekEnd_ !== -1 && seekableEnd !== this.lastSeekEnd_) {
      this.pastSeekEnd_ = 0;
    }
    this.lastSeekEnd_ = seekableEnd;
    return this.pastSeekEnd_;
  }

  /**
   * If we are currently behind the live edge, aka currentTime will be
   * behind on a seekableendchange
   *
   * @return {boolean}
   *         If we are behind the live edge
   */
  behindLiveEdge() {
    return this.behindLiveEdge_;
  }

  /**
   * Whether live tracker is currently tracking or not.
   */
  isTracking() {
    return typeof this.trackingInterval_ === 'number';
  }

  /**
   * Seek to the live edge if we are behind the live edge
   */
  seekToLiveEdge() {
    this.seekedBehindLive_ = false;
    if (this.atLiveEdge()) {
      return;
    }
    this.nextSeekedFromUser_ = false;
    this.player_.currentTime(this.liveCurrentTime());
  }

  /**
   * Dispose of liveTracker
   */
  dispose() {
    this.stopTracking();
    super.dispose();
  }
}
Component.registerComponent('LiveTracker', LiveTracker);

/**
 * Displays an element over the player which contains an optional title and
 * description for the current content.
 *
 * Much of the code for this component originated in the now obsolete
 * videojs-dock plugin: https://github.com/brightcove/videojs-dock/
 *
 * @extends Component
 */
class TitleBar extends Component {
  constructor(player, options) {
    super(player, options);
    this.on('statechanged', e => this.updateDom_());
    this.updateDom_();
  }

  /**
   * Create the `TitleBar`'s DOM element
   *
   * @return {Element}
   *         The element that was created.
   */
  createEl() {
    this.els = {
      title: createEl('div', {
        className: 'vjs-title-bar-title',
        id: `vjs-title-bar-title-${newGUID()}`
      }),
      description: createEl('div', {
        className: 'vjs-title-bar-description',
        id: `vjs-title-bar-description-${newGUID()}`
      })
    };
    return createEl('div', {
      className: 'vjs-title-bar'
    }, {}, Object.values(this.els));
  }

  /**
   * Updates the DOM based on the component's state object.
   */
  updateDom_() {
    const tech = this.player_.tech_;
    const techEl = tech && tech.el_;
    const techAriaAttrs = {
      title: 'aria-labelledby',
      description: 'aria-describedby'
    };
    ['title', 'description'].forEach(k => {
      const value = this.state[k];
      const el = this.els[k];
      const techAriaAttr = techAriaAttrs[k];
      emptyEl(el);
      if (value) {
        textContent(el, value);
      }

      // If there is a tech element available, update its ARIA attributes
      // according to whether a title and/or description have been provided.
      if (techEl) {
        techEl.removeAttribute(techAriaAttr);
        if (value) {
          techEl.setAttribute(techAriaAttr, el.id);
        }
      }
    });
    if (this.state.title || this.state.description) {
      this.show();
    } else {
      this.hide();
    }
  }

  /**
   * Update the contents of the title bar component with new title and
   * description text.
   *
   * If both title and description are missing, the title bar will be hidden.
   *
   * If either title or description are present, the title bar will be visible.
   *
   * NOTE: Any previously set value will be preserved. To unset a previously
   * set value, you must pass an empty string or null.
   *
   * For example:
   *
   * ```
   * update({title: 'foo', description: 'bar'}) // title: 'foo', description: 'bar'
   * update({description: 'bar2'}) // title: 'foo', description: 'bar2'
   * update({title: ''}) // title: '', description: 'bar2'
   * update({title: 'foo', description: null}) // title: 'foo', description: null
   * ```
   *
   * @param  {Object} [options={}]
   *         An options object. When empty, the title bar will be hidden.
   *
   * @param  {string} [options.title]
   *         A title to display in the title bar.
   *
   * @param  {string} [options.description]
   *         A description to display in the title bar.
   */
  update(options) {
    this.setState(options);
  }

  /**
   * Dispose the component.
   */
  dispose() {
    const tech = this.player_.tech_;
    const techEl = tech && tech.el_;
    if (techEl) {
      techEl.removeAttribute('aria-labelledby');
      techEl.removeAttribute('aria-describedby');
    }
    super.dispose();
    this.els = null;
  }
}
Component.registerComponent('TitleBar', TitleBar);

/**
 * This function is used to fire a sourceset when there is something
 * similar to `mediaEl.load()` being called. It will try to find the source via
 * the `src` attribute and then the `<source>` elements. It will then fire `sourceset`
 * with the source that was found or empty string if we cannot know. If it cannot
 * find a source then `sourceset` will not be fired.
 *
 * @param { import('./html5').default } tech
 *        The tech object that sourceset was setup on
 *
 * @return {boolean}
 *         returns false if the sourceset was not fired and true otherwise.
 */
const sourcesetLoad = tech => {
  const el = tech.el();

  // if `el.src` is set, that source will be loaded.
  if (el.hasAttribute('src')) {
    tech.triggerSourceset(el.src);
    return true;
  }

  /**
   * Since there isn't a src property on the media element, source elements will be used for
   * implementing the source selection algorithm. This happens asynchronously and
   * for most cases were there is more than one source we cannot tell what source will
   * be loaded, without re-implementing the source selection algorithm. At this time we are not
   * going to do that. There are three special cases that we do handle here though:
   *
   * 1. If there are no sources, do not fire `sourceset`.
   * 2. If there is only one `<source>` with a `src` property/attribute that is our `src`
   * 3. If there is more than one `<source>` but all of them have the same `src` url.
   *    That will be our src.
   */
  const sources = tech.$$('source');
  const srcUrls = [];
  let src = '';

  // if there are no sources, do not fire sourceset
  if (!sources.length) {
    return false;
  }

  // only count valid/non-duplicate source elements
  for (let i = 0; i < sources.length; i++) {
    const url = sources[i].src;
    if (url && srcUrls.indexOf(url) === -1) {
      srcUrls.push(url);
    }
  }

  // there were no valid sources
  if (!srcUrls.length) {
    return false;
  }

  // there is only one valid source element url
  // use that
  if (srcUrls.length === 1) {
    src = srcUrls[0];
  }
  tech.triggerSourceset(src);
  return true;
};

/**
 * our implementation of an `innerHTML` descriptor for browsers
 * that do not have one.
 */
const innerHTMLDescriptorPolyfill = Object.defineProperty({}, 'innerHTML', {
  get() {
    return this.cloneNode(true).innerHTML;
  },
  set(v) {
    // make a dummy node to use innerHTML on
    const dummy = document.createElement(this.nodeName.toLowerCase());

    // set innerHTML to the value provided
    dummy.innerHTML = v;

    // make a document fragment to hold the nodes from dummy
    const docFrag = document.createDocumentFragment();

    // copy all of the nodes created by the innerHTML on dummy
    // to the document fragment
    while (dummy.childNodes.length) {
      docFrag.appendChild(dummy.childNodes[0]);
    }

    // remove content
    this.innerText = '';

    // now we add all of that html in one by appending the
    // document fragment. This is how innerHTML does it.
    window.Element.prototype.appendChild.call(this, docFrag);

    // then return the result that innerHTML's setter would
    return this.innerHTML;
  }
});

/**
 * Get a property descriptor given a list of priorities and the
 * property to get.
 */
const getDescriptor = (priority, prop) => {
  let descriptor = {};
  for (let i = 0; i < priority.length; i++) {
    descriptor = Object.getOwnPropertyDescriptor(priority[i], prop);
    if (descriptor && descriptor.set && descriptor.get) {
      break;
    }
  }
  descriptor.enumerable = true;
  descriptor.configurable = true;
  return descriptor;
};
const getInnerHTMLDescriptor = tech => getDescriptor([tech.el(), window.HTMLMediaElement.prototype, window.Element.prototype, innerHTMLDescriptorPolyfill], 'innerHTML');

/**
 * Patches browser internal functions so that we can tell synchronously
 * if a `<source>` was appended to the media element. For some reason this
 * causes a `sourceset` if the the media element is ready and has no source.
 * This happens when:
 * - The page has just loaded and the media element does not have a source.
 * - The media element was emptied of all sources, then `load()` was called.
 *
 * It does this by patching the following functions/properties when they are supported:
 *
 * - `append()` - can be used to add a `<source>` element to the media element
 * - `appendChild()` - can be used to add a `<source>` element to the media element
 * - `insertAdjacentHTML()` -  can be used to add a `<source>` element to the media element
 * - `innerHTML` -  can be used to add a `<source>` element to the media element
 *
 * @param {Html5} tech
 *        The tech object that sourceset is being setup on.
 */
const firstSourceWatch = function (tech) {
  const el = tech.el();

  // make sure firstSourceWatch isn't setup twice.
  if (el.resetSourceWatch_) {
    return;
  }
  const old = {};
  const innerDescriptor = getInnerHTMLDescriptor(tech);
  const appendWrapper = appendFn => (...args) => {
    const retval = appendFn.apply(el, args);
    sourcesetLoad(tech);
    return retval;
  };
  ['append', 'appendChild', 'insertAdjacentHTML'].forEach(k => {
    if (!el[k]) {
      return;
    }

    // store the old function
    old[k] = el[k];

    // call the old function with a sourceset if a source
    // was loaded
    el[k] = appendWrapper(old[k]);
  });
  Object.defineProperty(el, 'innerHTML', merge(innerDescriptor, {
    set: appendWrapper(innerDescriptor.set)
  }));
  el.resetSourceWatch_ = () => {
    el.resetSourceWatch_ = null;
    Object.keys(old).forEach(k => {
      el[k] = old[k];
    });
    Object.defineProperty(el, 'innerHTML', innerDescriptor);
  };

  // on the first sourceset, we need to revert our changes
  tech.one('sourceset', el.resetSourceWatch_);
};

/**
 * our implementation of a `src` descriptor for browsers
 * that do not have one
 */
const srcDescriptorPolyfill = Object.defineProperty({}, 'src', {
  get() {
    if (this.hasAttribute('src')) {
      return getAbsoluteURL(window.Element.prototype.getAttribute.call(this, 'src'));
    }
    return '';
  },
  set(v) {
    window.Element.prototype.setAttribute.call(this, 'src', v);
    return v;
  }
});
const getSrcDescriptor = tech => getDescriptor([tech.el(), window.HTMLMediaElement.prototype, srcDescriptorPolyfill], 'src');

/**
 * setup `sourceset` handling on the `Html5` tech. This function
 * patches the following element properties/functions:
 *
 * - `src` - to determine when `src` is set
 * - `setAttribute()` - to determine when `src` is set
 * - `load()` - this re-triggers the source selection algorithm, and can
 *              cause a sourceset.
 *
 * If there is no source when we are adding `sourceset` support or during a `load()`
 * we also patch the functions listed in `firstSourceWatch`.
 *
 * @param {Html5} tech
 *        The tech to patch
 */
const setupSourceset = function (tech) {
  if (!tech.featuresSourceset) {
    return;
  }
  const el = tech.el();

  // make sure sourceset isn't setup twice.
  if (el.resetSourceset_) {
    return;
  }
  const srcDescriptor = getSrcDescriptor(tech);
  const oldSetAttribute = el.setAttribute;
  const oldLoad = el.load;
  Object.defineProperty(el, 'src', merge(srcDescriptor, {
    set: v => {
      const retval = srcDescriptor.set.call(el, v);

      // we use the getter here to get the actual value set on src
      tech.triggerSourceset(el.src);
      return retval;
    }
  }));
  el.setAttribute = (n, v) => {
    const retval = oldSetAttribute.call(el, n, v);
    if (/src/i.test(n)) {
      tech.triggerSourceset(el.src);
    }
    return retval;
  };
  el.load = () => {
    const retval = oldLoad.call(el);

    // if load was called, but there was no source to fire
    // sourceset on. We have to watch for a source append
    // as that can trigger a `sourceset` when the media element
    // has no source
    if (!sourcesetLoad(tech)) {
      tech.triggerSourceset('');
      firstSourceWatch(tech);
    }
    return retval;
  };
  if (el.currentSrc) {
    tech.triggerSourceset(el.currentSrc);
  } else if (!sourcesetLoad(tech)) {
    firstSourceWatch(tech);
  }
  el.resetSourceset_ = () => {
    el.resetSourceset_ = null;
    el.load = oldLoad;
    el.setAttribute = oldSetAttribute;
    Object.defineProperty(el, 'src', srcDescriptor);
    if (el.resetSourceWatch_) {
      el.resetSourceWatch_();
    }
  };
};

/**
 * @file html5.js
 */

/**
 * HTML5 Media Controller - Wrapper for HTML5 Media API
 *
 * @mixes Tech~SourceHandlerAdditions
 * @extends Tech
 */
class Html5 extends Tech {
  /**
  * Create an instance of this Tech.
  *
  * @param {Object} [options]
  *        The key/value store of player options.
  *
  * @param {Function} [ready]
  *        Callback function to call when the `HTML5` Tech is ready.
  */
  constructor(options, ready) {
    super(options, ready);
    const source = options.source;
    let crossoriginTracks = false;
    this.featuresVideoFrameCallback = this.featuresVideoFrameCallback && this.el_.tagName === 'VIDEO';

    // Set the source if one is provided
    // 1) Check if the source is new (if not, we want to keep the original so playback isn't interrupted)
    // 2) Check to see if the network state of the tag was failed at init, and if so, reset the source
    // anyway so the error gets fired.
    if (source && (this.el_.currentSrc !== source.src || options.tag && options.tag.initNetworkState_ === 3)) {
      this.setSource(source);
    } else {
      this.handleLateInit_(this.el_);
    }

    // setup sourceset after late sourceset/init
    if (options.enableSourceset) {
      this.setupSourcesetHandling_();
    }
    this.isScrubbing_ = false;
    if (this.el_.hasChildNodes()) {
      const nodes = this.el_.childNodes;
      let nodesLength = nodes.length;
      const removeNodes = [];
      while (nodesLength--) {
        const node = nodes[nodesLength];
        const nodeName = node.nodeName.toLowerCase();
        if (nodeName === 'track') {
          if (!this.featuresNativeTextTracks) {
            // Empty video tag tracks so the built-in player doesn't use them also.
            // This may not be fast enough to stop HTML5 browsers from reading the tags
            // so we'll need to turn off any default tracks if we're manually doing
            // captions and subtitles. videoElement.textTracks
            removeNodes.push(node);
          } else {
            // store HTMLTrackElement and TextTrack to remote list
            this.remoteTextTrackEls().addTrackElement_(node);
            this.remoteTextTracks().addTrack(node.track);
            this.textTracks().addTrack(node.track);
            if (!crossoriginTracks && !this.el_.hasAttribute('crossorigin') && isCrossOrigin(node.src)) {
              crossoriginTracks = true;
            }
          }
        }
      }
      for (let i = 0; i < removeNodes.length; i++) {
        this.el_.removeChild(removeNodes[i]);
      }
    }
    this.proxyNativeTracks_();
    if (this.featuresNativeTextTracks && crossoriginTracks) {
      log.warn('Text Tracks are being loaded from another origin but the crossorigin attribute isn\'t used.\n' + 'This may prevent text tracks from loading.');
    }

    // prevent iOS Safari from disabling metadata text tracks during native playback
    this.restoreMetadataTracksInIOSNativePlayer_();

    // Determine if native controls should be used
    // Our goal should be to get the custom controls on mobile solid everywhere
    // so we can remove this all together. Right now this will block custom
    // controls on touch enabled laptops like the Chrome Pixel
    if ((TOUCH_ENABLED || IS_IPHONE) && options.nativeControlsForTouch === true) {
      this.setControls(true);
    }

    // on iOS, we want to proxy `webkitbeginfullscreen` and `webkitendfullscreen`
    // into a `fullscreenchange` event
    this.proxyWebkitFullscreen_();
    this.triggerReady();
  }

  /**
   * Dispose of `HTML5` media element and remove all tracks.
   */
  dispose() {
    if (this.el_ && this.el_.resetSourceset_) {
      this.el_.resetSourceset_();
    }
    Html5.disposeMediaElement(this.el_);
    this.options_ = null;

    // tech will handle clearing of the emulated track list
    super.dispose();
  }

  /**
   * Modify the media element so that we can detect when
   * the source is changed. Fires `sourceset` just after the source has changed
   */
  setupSourcesetHandling_() {
    setupSourceset(this);
  }

  /**
   * When a captions track is enabled in the iOS Safari native player, all other
   * tracks are disabled (including metadata tracks), which nulls all of their
   * associated cue points. This will restore metadata tracks to their pre-fullscreen
   * state in those cases so that cue points are not needlessly lost.
   *
   * @private
   */
  restoreMetadataTracksInIOSNativePlayer_() {
    const textTracks = this.textTracks();
    let metadataTracksPreFullscreenState;

    // captures a snapshot of every metadata track's current state
    const takeMetadataTrackSnapshot = () => {
      metadataTracksPreFullscreenState = [];
      for (let i = 0; i < textTracks.length; i++) {
        const track = textTracks[i];
        if (track.kind === 'metadata') {
          metadataTracksPreFullscreenState.push({
            track,
            storedMode: track.mode
          });
        }
      }
    };

    // snapshot each metadata track's initial state, and update the snapshot
    // each time there is a track 'change' event
    takeMetadataTrackSnapshot();
    textTracks.addEventListener('change', takeMetadataTrackSnapshot);
    this.on('dispose', () => textTracks.removeEventListener('change', takeMetadataTrackSnapshot));
    const restoreTrackMode = () => {
      for (let i = 0; i < metadataTracksPreFullscreenState.length; i++) {
        const storedTrack = metadataTracksPreFullscreenState[i];
        if (storedTrack.track.mode === 'disabled' && storedTrack.track.mode !== storedTrack.storedMode) {
          storedTrack.track.mode = storedTrack.storedMode;
        }
      }
      // we only want this handler to be executed on the first 'change' event
      textTracks.removeEventListener('change', restoreTrackMode);
    };

    // when we enter fullscreen playback, stop updating the snapshot and
    // restore all track modes to their pre-fullscreen state
    this.on('webkitbeginfullscreen', () => {
      textTracks.removeEventListener('change', takeMetadataTrackSnapshot);

      // remove the listener before adding it just in case it wasn't previously removed
      textTracks.removeEventListener('change', restoreTrackMode);
      textTracks.addEventListener('change', restoreTrackMode);
    });

    // start updating the snapshot again after leaving fullscreen
    this.on('webkitendfullscreen', () => {
      // remove the listener before adding it just in case it wasn't previously removed
      textTracks.removeEventListener('change', takeMetadataTrackSnapshot);
      textTracks.addEventListener('change', takeMetadataTrackSnapshot);

      // remove the restoreTrackMode handler in case it wasn't triggered during fullscreen playback
      textTracks.removeEventListener('change', restoreTrackMode);
    });
  }

  /**
   * Attempt to force override of tracks for the given type
   *
   * @param {string} type - Track type to override, possible values include 'Audio',
   * 'Video', and 'Text'.
   * @param {boolean} override - If set to true native audio/video will be overridden,
   * otherwise native audio/video will potentially be used.
   * @private
   */
  overrideNative_(type, override) {
    // If there is no behavioral change don't add/remove listeners
    if (override !== this[`featuresNative${type}Tracks`]) {
      return;
    }
    const lowerCaseType = type.toLowerCase();
    if (this[`${lowerCaseType}TracksListeners_`]) {
      Object.keys(this[`${lowerCaseType}TracksListeners_`]).forEach(eventName => {
        const elTracks = this.el()[`${lowerCaseType}Tracks`];
        elTracks.removeEventListener(eventName, this[`${lowerCaseType}TracksListeners_`][eventName]);
      });
    }
    this[`featuresNative${type}Tracks`] = !override;
    this[`${lowerCaseType}TracksListeners_`] = null;
    this.proxyNativeTracksForType_(lowerCaseType);
  }

  /**
   * Attempt to force override of native audio tracks.
   *
   * @param {boolean} override - If set to true native audio will be overridden,
   * otherwise native audio will potentially be used.
   */
  overrideNativeAudioTracks(override) {
    this.overrideNative_('Audio', override);
  }

  /**
   * Attempt to force override of native video tracks.
   *
   * @param {boolean} override - If set to true native video will be overridden,
   * otherwise native video will potentially be used.
   */
  overrideNativeVideoTracks(override) {
    this.overrideNative_('Video', override);
  }

  /**
   * Proxy native track list events for the given type to our track
   * lists if the browser we are playing in supports that type of track list.
   *
   * @param {string} name - Track type; values include 'audio', 'video', and 'text'
   * @private
   */
  proxyNativeTracksForType_(name) {
    const props = NORMAL[name];
    const elTracks = this.el()[props.getterName];
    const techTracks = this[props.getterName]();
    if (!this[`featuresNative${props.capitalName}Tracks`] || !elTracks || !elTracks.addEventListener) {
      return;
    }
    const listeners = {
      change: e => {
        const event = {
          type: 'change',
          target: techTracks,
          currentTarget: techTracks,
          srcElement: techTracks
        };
        techTracks.trigger(event);

        // if we are a text track change event, we should also notify the
        // remote text track list. This can potentially cause a false positive
        // if we were to get a change event on a non-remote track and
        // we triggered the event on the remote text track list which doesn't
        // contain that track. However, best practices mean looping through the
        // list of tracks and searching for the appropriate mode value, so,
        // this shouldn't pose an issue
        if (name === 'text') {
          this[REMOTE.remoteText.getterName]().trigger(event);
        }
      },
      addtrack(e) {
        techTracks.addTrack(e.track);
      },
      removetrack(e) {
        techTracks.removeTrack(e.track);
      }
    };
    const removeOldTracks = function () {
      const removeTracks = [];
      for (let i = 0; i < techTracks.length; i++) {
        let found = false;
        for (let j = 0; j < elTracks.length; j++) {
          if (elTracks[j] === techTracks[i]) {
            found = true;
            break;
          }
        }
        if (!found) {
          removeTracks.push(techTracks[i]);
        }
      }
      while (removeTracks.length) {
        techTracks.removeTrack(removeTracks.shift());
      }
    };
    this[props.getterName + 'Listeners_'] = listeners;
    Object.keys(listeners).forEach(eventName => {
      const listener = listeners[eventName];
      elTracks.addEventListener(eventName, listener);
      this.on('dispose', e => elTracks.removeEventListener(eventName, listener));
    });

    // Remove (native) tracks that are not used anymore
    this.on('loadstart', removeOldTracks);
    this.on('dispose', e => this.off('loadstart', removeOldTracks));
  }

  /**
   * Proxy all native track list events to our track lists if the browser we are playing
   * in supports that type of track list.
   *
   * @private
   */
  proxyNativeTracks_() {
    NORMAL.names.forEach(name => {
      this.proxyNativeTracksForType_(name);
    });
  }

  /**
   * Create the `Html5` Tech's DOM element.
   *
   * @return {Element}
   *         The element that gets created.
   */
  createEl() {
    let el = this.options_.tag;

    // Check if this browser supports moving the element into the box.
    // On the iPhone video will break if you move the element,
    // So we have to create a brand new element.
    // If we ingested the player div, we do not need to move the media element.
    if (!el || !(this.options_.playerElIngest || this.movingMediaElementInDOM)) {
      // If the original tag is still there, clone and remove it.
      if (el) {
        const clone = el.cloneNode(true);
        if (el.parentNode) {
          el.parentNode.insertBefore(clone, el);
        }
        Html5.disposeMediaElement(el);
        el = clone;
      } else {
        el = document.createElement('video');

        // determine if native controls should be used
        const tagAttributes = this.options_.tag && getAttributes(this.options_.tag);
        const attributes = merge({}, tagAttributes);
        if (!TOUCH_ENABLED || this.options_.nativeControlsForTouch !== true) {
          delete attributes.controls;
        }
        setAttributes(el, Object.assign(attributes, {
          id: this.options_.techId,
          class: 'vjs-tech'
        }));
      }
      el.playerId = this.options_.playerId;
    }
    if (typeof this.options_.preload !== 'undefined') {
      setAttribute(el, 'preload', this.options_.preload);
    }
    if (this.options_.disablePictureInPicture !== undefined) {
      el.disablePictureInPicture = this.options_.disablePictureInPicture;
    }

    // Update specific tag settings, in case they were overridden
    // `autoplay` has to be *last* so that `muted` and `playsinline` are present
    // when iOS/Safari or other browsers attempt to autoplay.
    const settingsAttrs = ['loop', 'muted', 'playsinline', 'autoplay'];
    for (let i = 0; i < settingsAttrs.length; i++) {
      const attr = settingsAttrs[i];
      const value = this.options_[attr];
      if (typeof value !== 'undefined') {
        if (value) {
          setAttribute(el, attr, attr);
        } else {
          removeAttribute(el, attr);
        }
        el[attr] = value;
      }
    }
    return el;
  }

  /**
   * This will be triggered if the loadstart event has already fired, before videojs was
   * ready. Two known examples of when this can happen are:
   * 1. If we're loading the playback object after it has started loading
   * 2. The media is already playing the (often with autoplay on) then
   *
   * This function will fire another loadstart so that videojs can catchup.
   *
   * @fires Tech#loadstart
   *
   * @return {undefined}
   *         returns nothing.
   */
  handleLateInit_(el) {
    if (el.networkState === 0 || el.networkState === 3) {
      // The video element hasn't started loading the source yet
      // or didn't find a source
      return;
    }
    if (el.readyState === 0) {
      // NetworkState is set synchronously BUT loadstart is fired at the
      // end of the current stack, usually before setInterval(fn, 0).
      // So at this point we know loadstart may have already fired or is
      // about to fire, and either way the player hasn't seen it yet.
      // We don't want to fire loadstart prematurely here and cause a
      // double loadstart so we'll wait and see if it happens between now
      // and the next loop, and fire it if not.
      // HOWEVER, we also want to make sure it fires before loadedmetadata
      // which could also happen between now and the next loop, so we'll
      // watch for that also.
      let loadstartFired = false;
      const setLoadstartFired = function () {
        loadstartFired = true;
      };
      this.on('loadstart', setLoadstartFired);
      const triggerLoadstart = function () {
        // We did miss the original loadstart. Make sure the player
        // sees loadstart before loadedmetadata
        if (!loadstartFired) {
          this.trigger('loadstart');
        }
      };
      this.on('loadedmetadata', triggerLoadstart);
      this.ready(function () {
        this.off('loadstart', setLoadstartFired);
        this.off('loadedmetadata', triggerLoadstart);
        if (!loadstartFired) {
          // We did miss the original native loadstart. Fire it now.
          this.trigger('loadstart');
        }
      });
      return;
    }

    // From here on we know that loadstart already fired and we missed it.
    // The other readyState events aren't as much of a problem if we double
    // them, so not going to go to as much trouble as loadstart to prevent
    // that unless we find reason to.
    const eventsToTrigger = ['loadstart'];

    // loadedmetadata: newly equal to HAVE_METADATA (1) or greater
    eventsToTrigger.push('loadedmetadata');

    // loadeddata: newly increased to HAVE_CURRENT_DATA (2) or greater
    if (el.readyState >= 2) {
      eventsToTrigger.push('loadeddata');
    }

    // canplay: newly increased to HAVE_FUTURE_DATA (3) or greater
    if (el.readyState >= 3) {
      eventsToTrigger.push('canplay');
    }

    // canplaythrough: newly equal to HAVE_ENOUGH_DATA (4)
    if (el.readyState >= 4) {
      eventsToTrigger.push('canplaythrough');
    }

    // We still need to give the player time to add event listeners
    this.ready(function () {
      eventsToTrigger.forEach(function (type) {
        this.trigger(type);
      }, this);
    });
  }

  /**
   * Set whether we are scrubbing or not.
   * This is used to decide whether we should use `fastSeek` or not.
   * `fastSeek` is used to provide trick play on Safari browsers.
   *
   * @param {boolean} isScrubbing
   *                  - true for we are currently scrubbing
   *                  - false for we are no longer scrubbing
   */
  setScrubbing(isScrubbing) {
    this.isScrubbing_ = isScrubbing;
  }

  /**
   * Get whether we are scrubbing or not.
   *
   * @return {boolean} isScrubbing
   *                  - true for we are currently scrubbing
   *                  - false for we are no longer scrubbing
   */
  scrubbing() {
    return this.isScrubbing_;
  }

  /**
   * Set current time for the `HTML5` tech.
   *
   * @param {number} seconds
   *        Set the current time of the media to this.
   */
  setCurrentTime(seconds) {
    try {
      if (this.isScrubbing_ && this.el_.fastSeek && IS_ANY_SAFARI) {
        this.el_.fastSeek(seconds);
      } else {
        this.el_.currentTime = seconds;
      }
    } catch (e) {
      log(e, 'Video is not ready. (Video.js)');
      // this.warning(VideoJS.warnings.videoNotReady);
    }
  }

  /**
   * Get the current duration of the HTML5 media element.
   *
   * @return {number}
   *         The duration of the media or 0 if there is no duration.
   */
  duration() {
    // Android Chrome will report duration as Infinity for VOD HLS until after
    // playback has started, which triggers the live display erroneously.
    // Return NaN if playback has not started and trigger a durationupdate once
    // the duration can be reliably known.
    if (this.el_.duration === Infinity && IS_ANDROID && IS_CHROME && this.el_.currentTime === 0) {
      // Wait for the first `timeupdate` with currentTime > 0 - there may be
      // several with 0
      const checkProgress = () => {
        if (this.el_.currentTime > 0) {
          // Trigger durationchange for genuinely live video
          if (this.el_.duration === Infinity) {
            this.trigger('durationchange');
          }
          this.off('timeupdate', checkProgress);
        }
      };
      this.on('timeupdate', checkProgress);
      return NaN;
    }
    return this.el_.duration || NaN;
  }

  /**
   * Get the current width of the HTML5 media element.
   *
   * @return {number}
   *         The width of the HTML5 media element.
   */
  width() {
    return this.el_.offsetWidth;
  }

  /**
   * Get the current height of the HTML5 media element.
   *
   * @return {number}
   *         The height of the HTML5 media element.
   */
  height() {
    return this.el_.offsetHeight;
  }

  /**
   * Proxy iOS `webkitbeginfullscreen` and `webkitendfullscreen` into
   * `fullscreenchange` event.
   *
   * @private
   * @fires fullscreenchange
   * @listens webkitendfullscreen
   * @listens webkitbeginfullscreen
   * @listens webkitbeginfullscreen
   */
  proxyWebkitFullscreen_() {
    if (!('webkitDisplayingFullscreen' in this.el_)) {
      return;
    }
    const endFn = function () {
      this.trigger('fullscreenchange', {
        isFullscreen: false
      });
      // Safari will sometimes set controls on the videoelement when existing fullscreen.
      if (this.el_.controls && !this.options_.nativeControlsForTouch && this.controls()) {
        this.el_.controls = false;
      }
    };
    const beginFn = function () {
      if ('webkitPresentationMode' in this.el_ && this.el_.webkitPresentationMode !== 'picture-in-picture') {
        this.one('webkitendfullscreen', endFn);
        this.trigger('fullscreenchange', {
          isFullscreen: true,
          // set a flag in case another tech triggers fullscreenchange
          nativeIOSFullscreen: true
        });
      }
    };
    this.on('webkitbeginfullscreen', beginFn);
    this.on('dispose', () => {
      this.off('webkitbeginfullscreen', beginFn);
      this.off('webkitendfullscreen', endFn);
    });
  }

  /**
   * Check if fullscreen is supported on the video el.
   *
   * @return {boolean}
   *         - True if fullscreen is supported.
   *         - False if fullscreen is not supported.
   */
  supportsFullScreen() {
    return typeof this.el_.webkitEnterFullScreen === 'function';
  }

  /**
   * Request that the `HTML5` Tech enter fullscreen.
   */
  enterFullScreen() {
    const video = this.el_;
    if (video.paused && video.networkState <= video.HAVE_METADATA) {
      // attempt to prime the video element for programmatic access
      // this isn't necessary on the desktop but shouldn't hurt
      silencePromise(this.el_.play());

      // playing and pausing synchronously during the transition to fullscreen
      // can get iOS ~6.1 devices into a play/pause loop
      this.setTimeout(function () {
        video.pause();
        try {
          video.webkitEnterFullScreen();
        } catch (e) {
          this.trigger('fullscreenerror', e);
        }
      }, 0);
    } else {
      try {
        video.webkitEnterFullScreen();
      } catch (e) {
        this.trigger('fullscreenerror', e);
      }
    }
  }

  /**
   * Request that the `HTML5` Tech exit fullscreen.
   */
  exitFullScreen() {
    if (!this.el_.webkitDisplayingFullscreen) {
      this.trigger('fullscreenerror', new Error('The video is not fullscreen'));
      return;
    }
    this.el_.webkitExitFullScreen();
  }

  /**
   * Create a floating video window always on top of other windows so that users may
   * continue consuming media while they interact with other content sites, or
   * applications on their device.
   *
   * @see [Spec]{@link https://wicg.github.io/picture-in-picture}
   *
   * @return {Promise}
   *         A promise with a Picture-in-Picture window.
   */
  requestPictureInPicture() {
    return this.el_.requestPictureInPicture();
  }

  /**
   * Native requestVideoFrameCallback if supported by browser/tech, or fallback
   * Don't use rVCF on Safari when DRM is playing, as it doesn't fire
   * Needs to be checked later than the constructor
   * This will be a false positive for clear sources loaded after a Fairplay source
   *
   * @param {function} cb function to call
   * @return {number} id of request
   */
  requestVideoFrameCallback(cb) {
    if (this.featuresVideoFrameCallback && !this.el_.webkitKeys) {
      return this.el_.requestVideoFrameCallback(cb);
    }
    return super.requestVideoFrameCallback(cb);
  }

  /**
   * Native or fallback requestVideoFrameCallback
   *
   * @param {number} id request id to cancel
   */
  cancelVideoFrameCallback(id) {
    if (this.featuresVideoFrameCallback && !this.el_.webkitKeys) {
      this.el_.cancelVideoFrameCallback(id);
    } else {
      super.cancelVideoFrameCallback(id);
    }
  }

  /**
   * A getter/setter for the `Html5` Tech's source object.
   * > Note: Please use {@link Html5#setSource}
   *
   * @param {Tech~SourceObject} [src]
   *        The source object you want to set on the `HTML5` techs element.
   *
   * @return {Tech~SourceObject|undefined}
   *         - The current source object when a source is not passed in.
   *         - undefined when setting
   *
   * @deprecated Since version 5.
   */
  src(src) {
    if (src === undefined) {
      return this.el_.src;
    }

    // Setting src through `src` instead of `setSrc` will be deprecated
    this.setSrc(src);
  }

  /**
   * Reset the tech by removing all sources and then calling
   * {@link Html5.resetMediaElement}.
   */
  reset() {
    Html5.resetMediaElement(this.el_);
  }

  /**
   * Get the current source on the `HTML5` Tech. Falls back to returning the source from
   * the HTML5 media element.
   *
   * @return {Tech~SourceObject}
   *         The current source object from the HTML5 tech. With a fallback to the
   *         elements source.
   */
  currentSrc() {
    if (this.currentSource_) {
      return this.currentSource_.src;
    }
    return this.el_.currentSrc;
  }

  /**
   * Set controls attribute for the HTML5 media Element.
   *
   * @param {string} val
   *        Value to set the controls attribute to
   */
  setControls(val) {
    this.el_.controls = !!val;
  }

  /**
   * Create and returns a remote {@link TextTrack} object.
   *
   * @param {string} kind
   *        `TextTrack` kind (subtitles, captions, descriptions, chapters, or metadata)
   *
   * @param {string} [label]
   *        Label to identify the text track
   *
   * @param {string} [language]
   *        Two letter language abbreviation
   *
   * @return {TextTrack}
   *         The TextTrack that gets created.
   */
  addTextTrack(kind, label, language) {
    if (!this.featuresNativeTextTracks) {
      return super.addTextTrack(kind, label, language);
    }
    return this.el_.addTextTrack(kind, label, language);
  }

  /**
   * Creates either native TextTrack or an emulated TextTrack depending
   * on the value of `featuresNativeTextTracks`
   *
   * @param {Object} options
   *        The object should contain the options to initialize the TextTrack with.
   *
   * @param {string} [options.kind]
   *        `TextTrack` kind (subtitles, captions, descriptions, chapters, or metadata).
   *
   * @param {string} [options.label]
   *        Label to identify the text track
   *
   * @param {string} [options.language]
   *        Two letter language abbreviation.
   *
   * @param {boolean} [options.default]
   *        Default this track to on.
   *
   * @param {string} [options.id]
   *        The internal id to assign this track.
   *
   * @param {string} [options.src]
   *        A source url for the track.
   *
   * @return {HTMLTrackElement}
   *         The track element that gets created.
   */
  createRemoteTextTrack(options) {
    if (!this.featuresNativeTextTracks) {
      return super.createRemoteTextTrack(options);
    }
    const htmlTrackElement = document.createElement('track');
    if (options.kind) {
      htmlTrackElement.kind = options.kind;
    }
    if (options.label) {
      htmlTrackElement.label = options.label;
    }
    if (options.language || options.srclang) {
      htmlTrackElement.srclang = options.language || options.srclang;
    }
    if (options.default) {
      htmlTrackElement.default = options.default;
    }
    if (options.id) {
      htmlTrackElement.id = options.id;
    }
    if (options.src) {
      htmlTrackElement.src = options.src;
    }
    return htmlTrackElement;
  }

  /**
   * Creates a remote text track object and returns an html track element.
   *
   * @param {Object} options The object should contain values for
   * kind, language, label, and src (location of the WebVTT file)
   * @param {boolean} [manualCleanup=false] if set to true, the TextTrack
   * will not be removed from the TextTrackList and HtmlTrackElementList
   * after a source change
   * @return {HTMLTrackElement} An Html Track Element.
   * This can be an emulated {@link HTMLTrackElement} or a native one.
   *
   */
  addRemoteTextTrack(options, manualCleanup) {
    const htmlTrackElement = super.addRemoteTextTrack(options, manualCleanup);
    if (this.featuresNativeTextTracks) {
      this.el().appendChild(htmlTrackElement);
    }
    return htmlTrackElement;
  }

  /**
   * Remove remote `TextTrack` from `TextTrackList` object
   *
   * @param {TextTrack} track
   *        `TextTrack` object to remove
   */
  removeRemoteTextTrack(track) {
    super.removeRemoteTextTrack(track);
    if (this.featuresNativeTextTracks) {
      const tracks = this.$$('track');
      let i = tracks.length;
      while (i--) {
        if (track === tracks[i] || track === tracks[i].track) {
          this.el().removeChild(tracks[i]);
        }
      }
    }
  }

  /**
   * Gets available media playback quality metrics as specified by the W3C's Media
   * Playback Quality API.
   *
   * @see [Spec]{@link https://wicg.github.io/media-playback-quality}
   *
   * @return {Object}
   *         An object with supported media playback quality metrics
   */
  getVideoPlaybackQuality() {
    if (typeof this.el().getVideoPlaybackQuality === 'function') {
      return this.el().getVideoPlaybackQuality();
    }
    const videoPlaybackQuality = {};
    if (typeof this.el().webkitDroppedFrameCount !== 'undefined' && typeof this.el().webkitDecodedFrameCount !== 'undefined') {
      videoPlaybackQuality.droppedVideoFrames = this.el().webkitDroppedFrameCount;
      videoPlaybackQuality.totalVideoFrames = this.el().webkitDecodedFrameCount;
    }
    if (window.performance) {
      videoPlaybackQuality.creationTime = window.performance.now();
    }
    return videoPlaybackQuality;
  }
}

/* HTML5 Support Testing ---------------------------------------------------- */

/**
 * Element for testing browser HTML5 media capabilities
 *
 * @type {Element}
 * @constant
 * @private
 */
defineLazyProperty(Html5, 'TEST_VID', function () {
  if (!isReal()) {
    return;
  }
  const video = document.createElement('video');
  const track = document.createElement('track');
  track.kind = 'captions';
  track.srclang = 'en';
  track.label = 'English';
  video.appendChild(track);
  return video;
});

/**
 * Check if HTML5 media is supported by this browser/device.
 *
 * @return {boolean}
 *         - True if HTML5 media is supported.
 *         - False if HTML5 media is not supported.
 */
Html5.isSupported = function () {
  // IE with no Media Player is a LIAR! (#984)
  try {
    Html5.TEST_VID.volume = 0.5;
  } catch (e) {
    return false;
  }
  return !!(Html5.TEST_VID && Html5.TEST_VID.canPlayType);
};

/**
 * Check if the tech can support the given type
 *
 * @param {string} type
 *        The mimetype to check
 * @return {string} 'probably', 'maybe', or '' (empty string)
 */
Html5.canPlayType = function (type) {
  return Html5.TEST_VID.canPlayType(type);
};

/**
 * Check if the tech can support the given source
 *
 * @param {Object} srcObj
 *        The source object
 * @param {Object} options
 *        The options passed to the tech
 * @return {string} 'probably', 'maybe', or '' (empty string)
 */
Html5.canPlaySource = function (srcObj, options) {
  return Html5.canPlayType(srcObj.type);
};

/**
 * Check if the volume can be changed in this browser/device.
 * Volume cannot be changed in a lot of mobile devices.
 * Specifically, it can't be changed from 1 on iOS.
 *
 * @return {boolean}
 *         - True if volume can be controlled
 *         - False otherwise
 */
Html5.canControlVolume = function () {
  // IE will error if Windows Media Player not installed #3315
  try {
    const volume = Html5.TEST_VID.volume;
    Html5.TEST_VID.volume = volume / 2 + 0.1;
    const canControl = volume !== Html5.TEST_VID.volume;

    // With the introduction of iOS 15, there are cases where the volume is read as
    // changed but reverts back to its original state at the start of the next tick.
    // To determine whether volume can be controlled on iOS,
    // a timeout is set and the volume is checked asynchronously.
    // Since `features` doesn't currently work asynchronously, the value is manually set.
    if (canControl && IS_IOS) {
      window.setTimeout(() => {
        if (Html5 && Html5.prototype) {
          Html5.prototype.featuresVolumeControl = volume !== Html5.TEST_VID.volume;
        }
      });

      // default iOS to false, which will be updated in the timeout above.
      return false;
    }
    return canControl;
  } catch (e) {
    return false;
  }
};

/**
 * Check if the volume can be muted in this browser/device.
 * Some devices, e.g. iOS, don't allow changing volume
 * but permits muting/unmuting.
 *
 * @return {boolean}
 *      - True if volume can be muted
 *      - False otherwise
 */
Html5.canMuteVolume = function () {
  try {
    const muted = Html5.TEST_VID.muted;

    // in some versions of iOS muted property doesn't always
    // work, so we want to set both property and attribute
    Html5.TEST_VID.muted = !muted;
    if (Html5.TEST_VID.muted) {
      setAttribute(Html5.TEST_VID, 'muted', 'muted');
    } else {
      removeAttribute(Html5.TEST_VID, 'muted', 'muted');
    }
    return muted !== Html5.TEST_VID.muted;
  } catch (e) {
    return false;
  }
};

/**
 * Check if the playback rate can be changed in this browser/device.
 *
 * @return {boolean}
 *         - True if playback rate can be controlled
 *         - False otherwise
 */
Html5.canControlPlaybackRate = function () {
  // Playback rate API is implemented in Android Chrome, but doesn't do anything
  // https://github.com/videojs/video.js/issues/3180
  if (IS_ANDROID && IS_CHROME && CHROME_VERSION < 58) {
    return false;
  }
  // IE will error if Windows Media Player not installed #3315
  try {
    const playbackRate = Html5.TEST_VID.playbackRate;
    Html5.TEST_VID.playbackRate = playbackRate / 2 + 0.1;
    return playbackRate !== Html5.TEST_VID.playbackRate;
  } catch (e) {
    return false;
  }
};

/**
 * Check if we can override a video/audio elements attributes, with
 * Object.defineProperty.
 *
 * @return {boolean}
 *         - True if builtin attributes can be overridden
 *         - False otherwise
 */
Html5.canOverrideAttributes = function () {
  // if we cannot overwrite the src/innerHTML property, there is no support
  // iOS 7 safari for instance cannot do this.
  try {
    const noop = () => {};
    Object.defineProperty(document.createElement('video'), 'src', {
      get: noop,
      set: noop
    });
    Object.defineProperty(document.createElement('audio'), 'src', {
      get: noop,
      set: noop
    });
    Object.defineProperty(document.createElement('video'), 'innerHTML', {
      get: noop,
      set: noop
    });
    Object.defineProperty(document.createElement('audio'), 'innerHTML', {
      get: noop,
      set: noop
    });
  } catch (e) {
    return false;
  }
  return true;
};

/**
 * Check to see if native `TextTrack`s are supported by this browser/device.
 *
 * @return {boolean}
 *         - True if native `TextTrack`s are supported.
 *         - False otherwise
 */
Html5.supportsNativeTextTracks = function () {
  return IS_ANY_SAFARI || IS_IOS && IS_CHROME;
};

/**
 * Check to see if native `VideoTrack`s are supported by this browser/device
 *
 * @return {boolean}
 *        - True if native `VideoTrack`s are supported.
 *        - False otherwise
 */
Html5.supportsNativeVideoTracks = function () {
  return !!(Html5.TEST_VID && Html5.TEST_VID.videoTracks);
};

/**
 * Check to see if native `AudioTrack`s are supported by this browser/device
 *
 * @return {boolean}
 *        - True if native `AudioTrack`s are supported.
 *        - False otherwise
 */
Html5.supportsNativeAudioTracks = function () {
  return !!(Html5.TEST_VID && Html5.TEST_VID.audioTracks);
};

/**
 * An array of events available on the Html5 tech.
 *
 * @private
 * @type {Array}
 */
Html5.Events = ['loadstart', 'suspend', 'abort', 'error', 'emptied', 'stalled', 'loadedmetadata', 'loadeddata', 'canplay', 'canplaythrough', 'playing', 'waiting', 'seeking', 'seeked', 'ended', 'durationchange', 'timeupdate', 'progress', 'play', 'pause', 'ratechange', 'resize', 'volumechange'];

/**
 * Boolean indicating whether the `Tech` supports volume control.
 *
 * @type {boolean}
 * @default {@link Html5.canControlVolume}
 */
/**
 * Boolean indicating whether the `Tech` supports muting volume.
 *
 * @type {boolean}
 * @default {@link Html5.canMuteVolume}
 */

/**
 * Boolean indicating whether the `Tech` supports changing the speed at which the media
 * plays. Examples:
 *   - Set player to play 2x (twice) as fast
 *   - Set player to play 0.5x (half) as fast
 *
 * @type {boolean}
 * @default {@link Html5.canControlPlaybackRate}
 */

/**
 * Boolean indicating whether the `Tech` supports the `sourceset` event.
 *
 * @type {boolean}
 * @default
 */
/**
 * Boolean indicating whether the `HTML5` tech currently supports native `TextTrack`s.
 *
 * @type {boolean}
 * @default {@link Html5.supportsNativeTextTracks}
 */
/**
 * Boolean indicating whether the `HTML5` tech currently supports native `VideoTrack`s.
 *
 * @type {boolean}
 * @default {@link Html5.supportsNativeVideoTracks}
 */
/**
 * Boolean indicating whether the `HTML5` tech currently supports native `AudioTrack`s.
 *
 * @type {boolean}
 * @default {@link Html5.supportsNativeAudioTracks}
 */
[['featuresMuteControl', 'canMuteVolume'], ['featuresPlaybackRate', 'canControlPlaybackRate'], ['featuresSourceset', 'canOverrideAttributes'], ['featuresNativeTextTracks', 'supportsNativeTextTracks'], ['featuresNativeVideoTracks', 'supportsNativeVideoTracks'], ['featuresNativeAudioTracks', 'supportsNativeAudioTracks']].forEach(function ([key, fn]) {
  defineLazyProperty(Html5.prototype, key, () => Html5[fn](), true);
});
Html5.prototype.featuresVolumeControl = Html5.canControlVolume();

/**
 * Boolean indicating whether the `HTML5` tech currently supports the media element
 * moving in the DOM. iOS breaks if you move the media element, so this is set this to
 * false there. Everywhere else this should be true.
 *
 * @type {boolean}
 * @default
 */
Html5.prototype.movingMediaElementInDOM = !IS_IOS;

// TODO: Previous comment: No longer appears to be used. Can probably be removed.
//       Is this true?
/**
 * Boolean indicating whether the `HTML5` tech currently supports automatic media resize
 * when going into fullscreen.
 *
 * @type {boolean}
 * @default
 */
Html5.prototype.featuresFullscreenResize = true;

/**
 * Boolean indicating whether the `HTML5` tech currently supports the progress event.
 * If this is false, manual `progress` events will be triggered instead.
 *
 * @type {boolean}
 * @default
 */
Html5.prototype.featuresProgressEvents = true;

/**
 * Boolean indicating whether the `HTML5` tech currently supports the timeupdate event.
 * If this is false, manual `timeupdate` events will be triggered instead.
 *
 * @default
 */
Html5.prototype.featuresTimeupdateEvents = true;

/**
 * Whether the HTML5 el supports `requestVideoFrameCallback`
 *
 * @type {boolean}
 */
Html5.prototype.featuresVideoFrameCallback = !!(Html5.TEST_VID && Html5.TEST_VID.requestVideoFrameCallback);
Html5.disposeMediaElement = function (el) {
  if (!el) {
    return;
  }
  if (el.parentNode) {
    el.parentNode.removeChild(el);
  }

  // remove any child track or source nodes to prevent their loading
  while (el.hasChildNodes()) {
    el.removeChild(el.firstChild);
  }

  // remove any src reference. not setting `src=''` because that causes a warning
  // in firefox
  el.removeAttribute('src');

  // force the media element to update its loading state by calling load()
  // however IE on Windows 7N has a bug that throws an error so need a try/catch (#793)
  if (typeof el.load === 'function') {
    // wrapping in an iife so it's not deoptimized (#1060#discussion_r10324473)
    (function () {
      try {
        el.load();
      } catch (e) {
        // not supported
      }
    })();
  }
};
Html5.resetMediaElement = function (el) {
  if (!el) {
    return;
  }
  const sources = el.querySelectorAll('source');
  let i = sources.length;
  while (i--) {
    el.removeChild(sources[i]);
  }

  // remove any src reference.
  // not setting `src=''` because that throws an error
  el.removeAttribute('src');
  if (typeof el.load === 'function') {
    // wrapping in an iife so it's not deoptimized (#1060#discussion_r10324473)
    (function () {
      try {
        el.load();
      } catch (e) {
        // satisfy linter
      }
    })();
  }
};

/* Native HTML5 element property wrapping ----------------------------------- */
// Wrap native boolean attributes with getters that check both property and attribute
// The list is as followed:
// muted, defaultMuted, autoplay, controls, loop, playsinline
[
/**
 * Get the value of `muted` from the media element. `muted` indicates
 * that the volume for the media should be set to silent. This does not actually change
 * the `volume` attribute.
 *
 * @method Html5#muted
 * @return {boolean}
 *         - True if the value of `volume` should be ignored and the audio set to silent.
 *         - False if the value of `volume` should be used.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-muted}
 */
'muted',
/**
 * Get the value of `defaultMuted` from the media element. `defaultMuted` indicates
 * whether the media should start muted or not. Only changes the default state of the
 * media. `muted` and `defaultMuted` can have different values. {@link Html5#muted} indicates the
 * current state.
 *
 * @method Html5#defaultMuted
 * @return {boolean}
 *         - The value of `defaultMuted` from the media element.
 *         - True indicates that the media should start muted.
 *         - False indicates that the media should not start muted
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-defaultmuted}
 */
'defaultMuted',
/**
 * Get the value of `autoplay` from the media element. `autoplay` indicates
 * that the media should start to play as soon as the page is ready.
 *
 * @method Html5#autoplay
 * @return {boolean}
 *         - The value of `autoplay` from the media element.
 *         - True indicates that the media should start as soon as the page loads.
 *         - False indicates that the media should not start as soon as the page loads.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#attr-media-autoplay}
 */
'autoplay',
/**
 * Get the value of `controls` from the media element. `controls` indicates
 * whether the native media controls should be shown or hidden.
 *
 * @method Html5#controls
 * @return {boolean}
 *         - The value of `controls` from the media element.
 *         - True indicates that native controls should be showing.
 *         - False indicates that native controls should be hidden.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#attr-media-controls}
 */
'controls',
/**
 * Get the value of `loop` from the media element. `loop` indicates
 * that the media should return to the start of the media and continue playing once
 * it reaches the end.
 *
 * @method Html5#loop
 * @return {boolean}
 *         - The value of `loop` from the media element.
 *         - True indicates that playback should seek back to start once
 *           the end of a media is reached.
 *         - False indicates that playback should not loop back to the start when the
 *           end of the media is reached.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#attr-media-loop}
 */
'loop',
/**
 * Get the value of `playsinline` from the media element. `playsinline` indicates
 * to the browser that non-fullscreen playback is preferred when fullscreen
 * playback is the native default, such as in iOS Safari.
 *
 * @method Html5#playsinline
 * @return {boolean}
 *         - The value of `playsinline` from the media element.
 *         - True indicates that the media should play inline.
 *         - False indicates that the media should not play inline.
 *
 * @see [Spec]{@link https://html.spec.whatwg.org/#attr-video-playsinline}
 */
'playsinline'].forEach(function (prop) {
  Html5.prototype[prop] = function () {
    return this.el_[prop] || this.el_.hasAttribute(prop);
  };
});

// Wrap native boolean attributes with setters that set both property and attribute
// The list is as followed:
// setMuted, setDefaultMuted, setAutoplay, setLoop, setPlaysinline
// setControls is special-cased above
[
/**
 * Set the value of `muted` on the media element. `muted` indicates that the current
 * audio level should be silent.
 *
 * @method Html5#setMuted
 * @param {boolean} muted
 *        - True if the audio should be set to silent
 *        - False otherwise
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-muted}
 */
'muted',
/**
 * Set the value of `defaultMuted` on the media element. `defaultMuted` indicates that the current
 * audio level should be silent, but will only effect the muted level on initial playback..
 *
 * @method Html5.prototype.setDefaultMuted
 * @param {boolean} defaultMuted
 *        - True if the audio should be set to silent
 *        - False otherwise
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-defaultmuted}
 */
'defaultMuted',
/**
 * Set the value of `autoplay` on the media element. `autoplay` indicates
 * that the media should start to play as soon as the page is ready.
 *
 * @method Html5#setAutoplay
 * @param {boolean} autoplay
 *         - True indicates that the media should start as soon as the page loads.
 *         - False indicates that the media should not start as soon as the page loads.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#attr-media-autoplay}
 */
'autoplay',
/**
 * Set the value of `loop` on the media element. `loop` indicates
 * that the media should return to the start of the media and continue playing once
 * it reaches the end.
 *
 * @method Html5#setLoop
 * @param {boolean} loop
 *         - True indicates that playback should seek back to start once
 *           the end of a media is reached.
 *         - False indicates that playback should not loop back to the start when the
 *           end of the media is reached.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#attr-media-loop}
 */
'loop',
/**
 * Set the value of `playsinline` from the media element. `playsinline` indicates
 * to the browser that non-fullscreen playback is preferred when fullscreen
 * playback is the native default, such as in iOS Safari.
 *
 * @method Html5#setPlaysinline
 * @param {boolean} playsinline
 *         - True indicates that the media should play inline.
 *         - False indicates that the media should not play inline.
 *
 * @see [Spec]{@link https://html.spec.whatwg.org/#attr-video-playsinline}
 */
'playsinline'].forEach(function (prop) {
  Html5.prototype['set' + toTitleCase(prop)] = function (v) {
    this.el_[prop] = v;
    if (v) {
      this.el_.setAttribute(prop, prop);
    } else {
      this.el_.removeAttribute(prop);
    }
  };
});

// Wrap native properties with a getter
// The list is as followed
// paused, currentTime, buffered, volume, poster, preload, error, seeking
// seekable, ended, playbackRate, defaultPlaybackRate, disablePictureInPicture
// played, networkState, readyState, videoWidth, videoHeight, crossOrigin
[
/**
 * Get the value of `paused` from the media element. `paused` indicates whether the media element
 * is currently paused or not.
 *
 * @method Html5#paused
 * @return {boolean}
 *         The value of `paused` from the media element.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-paused}
 */
'paused',
/**
 * Get the value of `currentTime` from the media element. `currentTime` indicates
 * the current second that the media is at in playback.
 *
 * @method Html5#currentTime
 * @return {number}
 *         The value of `currentTime` from the media element.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-currenttime}
 */
'currentTime',
/**
 * Get the value of `buffered` from the media element. `buffered` is a `TimeRange`
 * object that represents the parts of the media that are already downloaded and
 * available for playback.
 *
 * @method Html5#buffered
 * @return {TimeRange}
 *         The value of `buffered` from the media element.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-buffered}
 */
'buffered',
/**
 * Get the value of `volume` from the media element. `volume` indicates
 * the current playback volume of audio for a media. `volume` will be a value from 0
 * (silent) to 1 (loudest and default).
 *
 * @method Html5#volume
 * @return {number}
 *         The value of `volume` from the media element. Value will be between 0-1.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-a-volume}
 */
'volume',
/**
 * Get the value of `poster` from the media element. `poster` indicates
 * that the url of an image file that can/will be shown when no media data is available.
 *
 * @method Html5#poster
 * @return {string}
 *         The value of `poster` from the media element. Value will be a url to an
 *         image.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#attr-video-poster}
 */
'poster',
/**
 * Get the value of `preload` from the media element. `preload` indicates
 * what should download before the media is interacted with. It can have the following
 * values:
 * - none: nothing should be downloaded
 * - metadata: poster and the first few frames of the media may be downloaded to get
 *   media dimensions and other metadata
 * - auto: allow the media and metadata for the media to be downloaded before
 *    interaction
 *
 * @method Html5#preload
 * @return {string}
 *         The value of `preload` from the media element. Will be 'none', 'metadata',
 *         or 'auto'.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#attr-media-preload}
 */
'preload',
/**
 * Get the value of the `error` from the media element. `error` indicates any
 * MediaError that may have occurred during playback. If error returns null there is no
 * current error.
 *
 * @method Html5#error
 * @return {MediaError|null}
 *         The value of `error` from the media element. Will be `MediaError` if there
 *         is a current error and null otherwise.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-error}
 */
'error',
/**
 * Get the value of `seeking` from the media element. `seeking` indicates whether the
 * media is currently seeking to a new position or not.
 *
 * @method Html5#seeking
 * @return {boolean}
 *         - The value of `seeking` from the media element.
 *         - True indicates that the media is currently seeking to a new position.
 *         - False indicates that the media is not seeking to a new position at this time.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-seeking}
 */
'seeking',
/**
 * Get the value of `seekable` from the media element. `seekable` returns a
 * `TimeRange` object indicating ranges of time that can currently be `seeked` to.
 *
 * @method Html5#seekable
 * @return {TimeRange}
 *         The value of `seekable` from the media element. A `TimeRange` object
 *         indicating the current ranges of time that can be seeked to.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-seekable}
 */
'seekable',
/**
 * Get the value of `ended` from the media element. `ended` indicates whether
 * the media has reached the end or not.
 *
 * @method Html5#ended
 * @return {boolean}
 *         - The value of `ended` from the media element.
 *         - True indicates that the media has ended.
 *         - False indicates that the media has not ended.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-ended}
 */
'ended',
/**
 * Get the value of `playbackRate` from the media element. `playbackRate` indicates
 * the rate at which the media is currently playing back. Examples:
 *   - if playbackRate is set to 2, media will play twice as fast.
 *   - if playbackRate is set to 0.5, media will play half as fast.
 *
 * @method Html5#playbackRate
 * @return {number}
 *         The value of `playbackRate` from the media element. A number indicating
 *         the current playback speed of the media, where 1 is normal speed.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-playbackrate}
 */
'playbackRate',
/**
 * Get the value of `defaultPlaybackRate` from the media element. `defaultPlaybackRate` indicates
 * the rate at which the media is currently playing back. This value will not indicate the current
 * `playbackRate` after playback has started, use {@link Html5#playbackRate} for that.
 *
 * Examples:
 *   - if defaultPlaybackRate is set to 2, media will play twice as fast.
 *   - if defaultPlaybackRate is set to 0.5, media will play half as fast.
 *
 * @method Html5.prototype.defaultPlaybackRate
 * @return {number}
 *         The value of `defaultPlaybackRate` from the media element. A number indicating
 *         the current playback speed of the media, where 1 is normal speed.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-playbackrate}
 */
'defaultPlaybackRate',
/**
 * Get the value of 'disablePictureInPicture' from the video element.
 *
 * @method Html5#disablePictureInPicture
 * @return {boolean} value
 *         - The value of `disablePictureInPicture` from the video element.
 *         - True indicates that the video can't be played in Picture-In-Picture mode
 *         - False indicates that the video can be played in Picture-In-Picture mode
 *
 * @see [Spec]{@link https://w3c.github.io/picture-in-picture/#disable-pip}
 */
'disablePictureInPicture',
/**
 * Get the value of `played` from the media element. `played` returns a `TimeRange`
 * object representing points in the media timeline that have been played.
 *
 * @method Html5#played
 * @return {TimeRange}
 *         The value of `played` from the media element. A `TimeRange` object indicating
 *         the ranges of time that have been played.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-played}
 */
'played',
/**
 * Get the value of `networkState` from the media element. `networkState` indicates
 * the current network state. It returns an enumeration from the following list:
 * - 0: NETWORK_EMPTY
 * - 1: NETWORK_IDLE
 * - 2: NETWORK_LOADING
 * - 3: NETWORK_NO_SOURCE
 *
 * @method Html5#networkState
 * @return {number}
 *         The value of `networkState` from the media element. This will be a number
 *         from the list in the description.
 *
 * @see [Spec] {@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-networkstate}
 */
'networkState',
/**
 * Get the value of `readyState` from the media element. `readyState` indicates
 * the current state of the media element. It returns an enumeration from the
 * following list:
 * - 0: HAVE_NOTHING
 * - 1: HAVE_METADATA
 * - 2: HAVE_CURRENT_DATA
 * - 3: HAVE_FUTURE_DATA
 * - 4: HAVE_ENOUGH_DATA
 *
 * @method Html5#readyState
 * @return {number}
 *         The value of `readyState` from the media element. This will be a number
 *         from the list in the description.
 *
 * @see [Spec] {@link https://www.w3.org/TR/html5/embedded-content-0.html#ready-states}
 */
'readyState',
/**
 * Get the value of `videoWidth` from the video element. `videoWidth` indicates
 * the current width of the video in css pixels.
 *
 * @method Html5#videoWidth
 * @return {number}
 *         The value of `videoWidth` from the video element. This will be a number
 *         in css pixels.
 *
 * @see [Spec] {@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-video-videowidth}
 */
'videoWidth',
/**
 * Get the value of `videoHeight` from the video element. `videoHeight` indicates
 * the current height of the video in css pixels.
 *
 * @method Html5#videoHeight
 * @return {number}
 *         The value of `videoHeight` from the video element. This will be a number
 *         in css pixels.
 *
 * @see [Spec] {@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-video-videowidth}
 */
'videoHeight',
/**
 * Get the value of `crossOrigin` from the media element. `crossOrigin` indicates
 * to the browser that should sent the cookies along with the requests for the
 * different assets/playlists
 *
 * @method Html5#crossOrigin
 * @return {string}
 *         - anonymous indicates that the media should not sent cookies.
 *         - use-credentials indicates that the media should sent cookies along the requests.
 *
 * @see [Spec]{@link https://html.spec.whatwg.org/#attr-media-crossorigin}
 */
'crossOrigin'].forEach(function (prop) {
  Html5.prototype[prop] = function () {
    return this.el_[prop];
  };
});

// Wrap native properties with a setter in this format:
// set + toTitleCase(name)
// The list is as follows:
// setVolume, setSrc, setPoster, setPreload, setPlaybackRate, setDefaultPlaybackRate,
// setDisablePictureInPicture, setCrossOrigin
[
/**
 * Set the value of `volume` on the media element. `volume` indicates the current
 * audio level as a percentage in decimal form. This means that 1 is 100%, 0.5 is 50%, and
 * so on.
 *
 * @method Html5#setVolume
 * @param {number} percentAsDecimal
 *        The volume percent as a decimal. Valid range is from 0-1.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-a-volume}
 */
'volume',
/**
 * Set the value of `src` on the media element. `src` indicates the current
 * {@link Tech~SourceObject} for the media.
 *
 * @method Html5#setSrc
 * @param {Tech~SourceObject} src
 *        The source object to set as the current source.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-src}
 */
'src',
/**
 * Set the value of `poster` on the media element. `poster` is the url to
 * an image file that can/will be shown when no media data is available.
 *
 * @method Html5#setPoster
 * @param {string} poster
 *        The url to an image that should be used as the `poster` for the media
 *        element.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#attr-media-poster}
 */
'poster',
/**
 * Set the value of `preload` on the media element. `preload` indicates
 * what should download before the media is interacted with. It can have the following
 * values:
 * - none: nothing should be downloaded
 * - metadata: poster and the first few frames of the media may be downloaded to get
 *   media dimensions and other metadata
 * - auto: allow the media and metadata for the media to be downloaded before
 *    interaction
 *
 * @method Html5#setPreload
 * @param {string} preload
 *         The value of `preload` to set on the media element. Must be 'none', 'metadata',
 *         or 'auto'.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#attr-media-preload}
 */
'preload',
/**
 * Set the value of `playbackRate` on the media element. `playbackRate` indicates
 * the rate at which the media should play back. Examples:
 *   - if playbackRate is set to 2, media will play twice as fast.
 *   - if playbackRate is set to 0.5, media will play half as fast.
 *
 * @method Html5#setPlaybackRate
 * @return {number}
 *         The value of `playbackRate` from the media element. A number indicating
 *         the current playback speed of the media, where 1 is normal speed.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-playbackrate}
 */
'playbackRate',
/**
 * Set the value of `defaultPlaybackRate` on the media element. `defaultPlaybackRate` indicates
 * the rate at which the media should play back upon initial startup. Changing this value
 * after a video has started will do nothing. Instead you should used {@link Html5#setPlaybackRate}.
 *
 * Example Values:
 *   - if playbackRate is set to 2, media will play twice as fast.
 *   - if playbackRate is set to 0.5, media will play half as fast.
 *
 * @method Html5.prototype.setDefaultPlaybackRate
 * @return {number}
 *         The value of `defaultPlaybackRate` from the media element. A number indicating
 *         the current playback speed of the media, where 1 is normal speed.
 *
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-defaultplaybackrate}
 */
'defaultPlaybackRate',
/**
 * Prevents the browser from suggesting a Picture-in-Picture context menu
 * or to request Picture-in-Picture automatically in some cases.
 *
 * @method Html5#setDisablePictureInPicture
 * @param {boolean} value
 *         The true value will disable Picture-in-Picture mode.
 *
 * @see [Spec]{@link https://w3c.github.io/picture-in-picture/#disable-pip}
 */
'disablePictureInPicture',
/**
 * Set the value of `crossOrigin` from the media element. `crossOrigin` indicates
 * to the browser that should sent the cookies along with the requests for the
 * different assets/playlists
 *
 * @method Html5#setCrossOrigin
 * @param {string} crossOrigin
 *         - anonymous indicates that the media should not sent cookies.
 *         - use-credentials indicates that the media should sent cookies along the requests.
 *
 * @see [Spec]{@link https://html.spec.whatwg.org/#attr-media-crossorigin}
 */
'crossOrigin'].forEach(function (prop) {
  Html5.prototype['set' + toTitleCase(prop)] = function (v) {
    this.el_[prop] = v;
  };
});

// wrap native functions with a function
// The list is as follows:
// pause, load, play
[
/**
 * A wrapper around the media elements `pause` function. This will call the `HTML5`
 * media elements `pause` function.
 *
 * @method Html5#pause
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-pause}
 */
'pause',
/**
 * A wrapper around the media elements `load` function. This will call the `HTML5`s
 * media element `load` function.
 *
 * @method Html5#load
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-load}
 */
'load',
/**
 * A wrapper around the media elements `play` function. This will call the `HTML5`s
 * media element `play` function.
 *
 * @method Html5#play
 * @see [Spec]{@link https://www.w3.org/TR/html5/embedded-content-0.html#dom-media-play}
 */
'play'].forEach(function (prop) {
  Html5.prototype[prop] = function () {
    return this.el_[prop]();
  };
});
Tech.withSourceHandlers(Html5);

/**
 * Native source handler for Html5, simply passes the source to the media element.
 *
 * @property {Tech~SourceObject} source
 *        The source object
 *
 * @property {Html5} tech
 *        The instance of the HTML5 tech.
 */
Html5.nativeSourceHandler = {};

/**
 * Check if the media element can play the given mime type.
 *
 * @param {string} type
 *        The mimetype to check
 *
 * @return {string}
 *         'probably', 'maybe', or '' (empty string)
 */
Html5.nativeSourceHandler.canPlayType = function (type) {
  // IE without MediaPlayer throws an error (#519)
  try {
    return Html5.TEST_VID.canPlayType(type);
  } catch (e) {
    return '';
  }
};

/**
 * Check if the media element can handle a source natively.
 *
 * @param {Tech~SourceObject} source
 *         The source object
 *
 * @param {Object} [options]
 *         Options to be passed to the tech.
 *
 * @return {string}
 *         'probably', 'maybe', or '' (empty string).
 */
Html5.nativeSourceHandler.canHandleSource = function (source, options) {
  // If a type was provided we should rely on that
  if (source.type) {
    return Html5.nativeSourceHandler.canPlayType(source.type);

    // If no type, fall back to checking 'video/[EXTENSION]'
  } else if (source.src) {
    const ext = getFileExtension(source.src);
    return Html5.nativeSourceHandler.canPlayType(`video/${ext}`);
  }
  return '';
};

/**
 * Pass the source to the native media element.
 *
 * @param {Tech~SourceObject} source
 *        The source object
 *
 * @param {Html5} tech
 *        The instance of the Html5 tech
 *
 * @param {Object} [options]
 *        The options to pass to the source
 */
Html5.nativeSourceHandler.handleSource = function (source, tech, options) {
  tech.setSrc(source.src);
};

/**
 * A noop for the native dispose function, as cleanup is not needed.
 */
Html5.nativeSourceHandler.dispose = function () {};

// Register the native source handler
Html5.registerSourceHandler(Html5.nativeSourceHandler);
Tech.registerTech('Html5', Html5);

/**
 * @file player.js
 */

// The following tech events are simply re-triggered
// on the player when they happen
const TECH_EVENTS_RETRIGGER = [
/**
 * Fired while the user agent is downloading media data.
 *
 * @event Player#progress
 * @type {Event}
 */
/**
 * Retrigger the `progress` event that was triggered by the {@link Tech}.
 *
 * @private
 * @method Player#handleTechProgress_
 * @fires Player#progress
 * @listens Tech#progress
 */
'progress',
/**
 * Fires when the loading of an audio/video is aborted.
 *
 * @event Player#abort
 * @type {Event}
 */
/**
 * Retrigger the `abort` event that was triggered by the {@link Tech}.
 *
 * @private
 * @method Player#handleTechAbort_
 * @fires Player#abort
 * @listens Tech#abort
 */
'abort',
/**
 * Fires when the browser is intentionally not getting media data.
 *
 * @event Player#suspend
 * @type {Event}
 */
/**
 * Retrigger the `suspend` event that was triggered by the {@link Tech}.
 *
 * @private
 * @method Player#handleTechSuspend_
 * @fires Player#suspend
 * @listens Tech#suspend
 */
'suspend',
/**
 * Fires when the current playlist is empty.
 *
 * @event Player#emptied
 * @type {Event}
 */
/**
 * Retrigger the `emptied` event that was triggered by the {@link Tech}.
 *
 * @private
 * @method Player#handleTechEmptied_
 * @fires Player#emptied
 * @listens Tech#emptied
 */
'emptied',
/**
 * Fires when the browser is trying to get media data, but data is not available.
 *
 * @event Player#stalled
 * @type {Event}
 */
/**
 * Retrigger the `stalled` event that was triggered by the {@link Tech}.
 *
 * @private
 * @method Player#handleTechStalled_
 * @fires Player#stalled
 * @listens Tech#stalled
 */
'stalled',
/**
 * Fires when the browser has loaded meta data for the audio/video.
 *
 * @event Player#loadedmetadata
 * @type {Event}
 */
/**
 * Retrigger the `loadedmetadata` event that was triggered by the {@link Tech}.
 *
 * @private
 * @method Player#handleTechLoadedmetadata_
 * @fires Player#loadedmetadata
 * @listens Tech#loadedmetadata
 */
'loadedmetadata',
/**
 * Fires when the browser has loaded the current frame of the audio/video.
 *
 * @event Player#loadeddata
 * @type {event}
 */
/**
 * Retrigger the `loadeddata` event that was triggered by the {@link Tech}.
 *
 * @private
 * @method Player#handleTechLoaddeddata_
 * @fires Player#loadeddata
 * @listens Tech#loadeddata
 */
'loadeddata',
/**
 * Fires when the current playback position has changed.
 *
 * @event Player#timeupdate
 * @type {event}
 */
/**
 * Retrigger the `timeupdate` event that was triggered by the {@link Tech}.
 *
 * @private
 * @method Player#handleTechTimeUpdate_
 * @fires Player#timeupdate
 * @listens Tech#timeupdate
 */
'timeupdate',
/**
 * Fires when the video's intrinsic dimensions change
 *
 * @event Player#resize
 * @type {event}
 */
/**
 * Retrigger the `resize` event that was triggered by the {@link Tech}.
 *
 * @private
 * @method Player#handleTechResize_
 * @fires Player#resize
 * @listens Tech#resize
 */
'resize',
/**
 * Fires when the volume has been changed
 *
 * @event Player#volumechange
 * @type {event}
 */
/**
 * Retrigger the `volumechange` event that was triggered by the {@link Tech}.
 *
 * @private
 * @method Player#handleTechVolumechange_
 * @fires Player#volumechange
 * @listens Tech#volumechange
 */
'volumechange',
/**
 * Fires when the text track has been changed
 *
 * @event Player#texttrackchange
 * @type {event}
 */
/**
 * Retrigger the `texttrackchange` event that was triggered by the {@link Tech}.
 *
 * @private
 * @method Player#handleTechTexttrackchange_
 * @fires Player#texttrackchange
 * @listens Tech#texttrackchange
 */
'texttrackchange'];

// events to queue when playback rate is zero
// this is a hash for the sole purpose of mapping non-camel-cased event names
// to camel-cased function names
const TECH_EVENTS_QUEUE = {
  canplay: 'CanPlay',
  canplaythrough: 'CanPlayThrough',
  playing: 'Playing',
  seeked: 'Seeked'
};
const BREAKPOINT_ORDER = ['tiny', 'xsmall', 'small', 'medium', 'large', 'xlarge', 'huge'];
const BREAKPOINT_CLASSES = {};

// grep: vjs-layout-tiny
// grep: vjs-layout-x-small
// grep: vjs-layout-small
// grep: vjs-layout-medium
// grep: vjs-layout-large
// grep: vjs-layout-x-large
// grep: vjs-layout-huge
BREAKPOINT_ORDER.forEach(k => {
  const v = k.charAt(0) === 'x' ? `x-${k.substring(1)}` : k;
  BREAKPOINT_CLASSES[k] = `vjs-layout-${v}`;
});
const DEFAULT_BREAKPOINTS = {
  tiny: 210,
  xsmall: 320,
  small: 425,
  medium: 768,
  large: 1440,
  xlarge: 2560,
  huge: Infinity
};

/**
 * An instance of the `Player` class is created when any of the Video.js setup methods
 * are used to initialize a video.
 *
 * After an instance has been created it can be accessed globally in three ways:
 * 1. By calling `videojs.getPlayer('example_video_1');`
 * 2. By calling `videojs('example_video_1');` (not recomended)
 * 2. By using it directly via  `videojs.players.example_video_1;`
 *
 * @extends Component
 * @global
 */
class Player extends Component {
  /**
   * Create an instance of this class.
   *
   * @param {Element} tag
   *        The original video DOM element used for configuring options.
   *
   * @param {Object} [options]
   *        Object of option names and values.
   *
   * @param {Function} [ready]
   *        Ready callback function.
   */
  constructor(tag, options, ready) {
    // Make sure tag ID exists
    tag.id = tag.id || options.id || `vjs_video_${newGUID()}`;

    // Set Options
    // The options argument overrides options set in the video tag
    // which overrides globally set options.
    // This latter part coincides with the load order
    // (tag must exist before Player)
    options = Object.assign(Player.getTagSettings(tag), options);

    // Delay the initialization of children because we need to set up
    // player properties first, and can't use `this` before `super()`
    options.initChildren = false;

    // Same with creating the element
    options.createEl = false;

    // don't auto mixin the evented mixin
    options.evented = false;

    // we don't want the player to report touch activity on itself
    // see enableTouchActivity in Component
    options.reportTouchActivity = false;

    // If language is not set, get the closest lang attribute
    if (!options.language) {
      const closest = tag.closest('[lang]');
      if (closest) {
        options.language = closest.getAttribute('lang');
      }
    }

    // Run base component initializing with new options
    super(null, options, ready);

    // Create bound methods for document listeners.
    this.boundDocumentFullscreenChange_ = e => this.documentFullscreenChange_(e);
    this.boundFullWindowOnEscKey_ = e => this.fullWindowOnEscKey(e);
    this.boundUpdateStyleEl_ = e => this.updateStyleEl_(e);
    this.boundApplyInitTime_ = e => this.applyInitTime_(e);
    this.boundUpdateCurrentBreakpoint_ = e => this.updateCurrentBreakpoint_(e);
    this.boundHandleTechClick_ = e => this.handleTechClick_(e);
    this.boundHandleTechDoubleClick_ = e => this.handleTechDoubleClick_(e);
    this.boundHandleTechTouchStart_ = e => this.handleTechTouchStart_(e);
    this.boundHandleTechTouchMove_ = e => this.handleTechTouchMove_(e);
    this.boundHandleTechTouchEnd_ = e => this.handleTechTouchEnd_(e);
    this.boundHandleTechTap_ = e => this.handleTechTap_(e);

    // default isFullscreen_ to false
    this.isFullscreen_ = false;

    // create logger
    this.log = createLogger(this.id_);

    // Hold our own reference to fullscreen api so it can be mocked in tests
    this.fsApi_ = FullscreenApi;

    // Tracks when a tech changes the poster
    this.isPosterFromTech_ = false;

    // Holds callback info that gets queued when playback rate is zero
    // and a seek is happening
    this.queuedCallbacks_ = [];

    // Turn off API access because we're loading a new tech that might load asynchronously
    this.isReady_ = false;

    // Init state hasStarted_
    this.hasStarted_ = false;

    // Init state userActive_
    this.userActive_ = false;

    // Init debugEnabled_
    this.debugEnabled_ = false;

    // Init state audioOnlyMode_
    this.audioOnlyMode_ = false;

    // Init state audioPosterMode_
    this.audioPosterMode_ = false;

    // Init state audioOnlyCache_
    this.audioOnlyCache_ = {
      playerHeight: null,
      hiddenChildren: []
    };

    // if the global option object was accidentally blown away by
    // someone, bail early with an informative error
    if (!this.options_ || !this.options_.techOrder || !this.options_.techOrder.length) {
      throw new Error('No techOrder specified. Did you overwrite ' + 'videojs.options instead of just changing the ' + 'properties you want to override?');
    }

    // Store the original tag used to set options
    this.tag = tag;

    // Store the tag attributes used to restore html5 element
    this.tagAttributes = tag && getAttributes(tag);

    // Update current language
    this.language(this.options_.language);

    // Update Supported Languages
    if (options.languages) {
      // Normalise player option languages to lowercase
      const languagesToLower = {};
      Object.getOwnPropertyNames(options.languages).forEach(function (name) {
        languagesToLower[name.toLowerCase()] = options.languages[name];
      });
      this.languages_ = languagesToLower;
    } else {
      this.languages_ = Player.prototype.options_.languages;
    }
    this.resetCache_();

    // Set poster
    this.poster_ = options.poster || '';

    // Set controls
    this.controls_ = !!options.controls;

    // Original tag settings stored in options
    // now remove immediately so native controls don't flash.
    // May be turned back on by HTML5 tech if nativeControlsForTouch is true
    tag.controls = false;
    tag.removeAttribute('controls');
    this.changingSrc_ = false;
    this.playCallbacks_ = [];
    this.playTerminatedQueue_ = [];

    // the attribute overrides the option
    if (tag.hasAttribute('autoplay')) {
      this.autoplay(true);
    } else {
      // otherwise use the setter to validate and
      // set the correct value.
      this.autoplay(this.options_.autoplay);
    }

    // check plugins
    if (options.plugins) {
      Object.keys(options.plugins).forEach(name => {
        if (typeof this[name] !== 'function') {
          throw new Error(`plugin "${name}" does not exist`);
        }
      });
    }

    /*
     * Store the internal state of scrubbing
     *
     * @private
     * @return {Boolean} True if the user is scrubbing
     */
    this.scrubbing_ = false;
    this.el_ = this.createEl();

    // Make this an evented object and use `el_` as its event bus.
    evented(this, {
      eventBusKey: 'el_'
    });

    // listen to document and player fullscreenchange handlers so we receive those events
    // before a user can receive them so we can update isFullscreen appropriately.
    // make sure that we listen to fullscreenchange events before everything else to make sure that
    // our isFullscreen method is updated properly for internal components as well as external.
    if (this.fsApi_.requestFullscreen) {
      on(document, this.fsApi_.fullscreenchange, this.boundDocumentFullscreenChange_);
      this.on(this.fsApi_.fullscreenchange, this.boundDocumentFullscreenChange_);
    }
    if (this.fluid_) {
      this.on(['playerreset', 'resize'], this.boundUpdateStyleEl_);
    }
    // We also want to pass the original player options to each component and plugin
    // as well so they don't need to reach back into the player for options later.
    // We also need to do another copy of this.options_ so we don't end up with
    // an infinite loop.
    const playerOptionsCopy = merge(this.options_);

    // Load plugins
    if (options.plugins) {
      Object.keys(options.plugins).forEach(name => {
        this[name](options.plugins[name]);
      });
    }

    // Enable debug mode to fire debugon event for all plugins.
    if (options.debug) {
      this.debug(true);
    }
    this.options_.playerOptions = playerOptionsCopy;
    this.middleware_ = [];
    this.playbackRates(options.playbackRates);
    this.initChildren();

    // Set isAudio based on whether or not an audio tag was used
    this.isAudio(tag.nodeName.toLowerCase() === 'audio');

    // Update controls className. Can't do this when the controls are initially
    // set because the element doesn't exist yet.
    if (this.controls()) {
      this.addClass('vjs-controls-enabled');
    } else {
      this.addClass('vjs-controls-disabled');
    }

    // Set ARIA label and region role depending on player type
    this.el_.setAttribute('role', 'region');
    if (this.isAudio()) {
      this.el_.setAttribute('aria-label', this.localize('Audio Player'));
    } else {
      this.el_.setAttribute('aria-label', this.localize('Video Player'));
    }
    if (this.isAudio()) {
      this.addClass('vjs-audio');
    }

    // TODO: Make this smarter. Toggle user state between touching/mousing
    // using events, since devices can have both touch and mouse events.
    // TODO: Make this check be performed again when the window switches between monitors
    // (See https://github.com/videojs/video.js/issues/5683)
    if (TOUCH_ENABLED) {
      this.addClass('vjs-touch-enabled');
    }

    // iOS Safari has broken hover handling
    if (!IS_IOS) {
      this.addClass('vjs-workinghover');
    }

    // Make player easily findable by ID
    Player.players[this.id_] = this;

    // Add a major version class to aid css in plugins
    const majorVersion = version.split('.')[0];
    this.addClass(`vjs-v${majorVersion}`);

    // When the player is first initialized, trigger activity so components
    // like the control bar show themselves if needed
    this.userActive(true);
    this.reportUserActivity();
    this.one('play', e => this.listenForUserActivity_(e));
    this.on('keydown', e => this.handleKeyDown(e));
    this.on('languagechange', e => this.handleLanguagechange(e));
    this.breakpoints(this.options_.breakpoints);
    this.responsive(this.options_.responsive);

    // Calling both the audio mode methods after the player is fully
    // setup to be able to listen to the events triggered by them
    this.on('ready', () => {
      // Calling the audioPosterMode method first so that
      // the audioOnlyMode can take precedence when both options are set to true
      this.audioPosterMode(this.options_.audioPosterMode);
      this.audioOnlyMode(this.options_.audioOnlyMode);
    });
  }

  /**
   * Destroys the video player and does any necessary cleanup.
   *
   * This is especially helpful if you are dynamically adding and removing videos
   * to/from the DOM.
   *
   * @fires Player#dispose
   */
  dispose() {
    /**
     * Called when the player is being disposed of.
     *
     * @event Player#dispose
     * @type {Event}
     */
    this.trigger('dispose');
    // prevent dispose from being called twice
    this.off('dispose');

    // Make sure all player-specific document listeners are unbound. This is
    off(document, this.fsApi_.fullscreenchange, this.boundDocumentFullscreenChange_);
    off(document, 'keydown', this.boundFullWindowOnEscKey_);
    if (this.styleEl_ && this.styleEl_.parentNode) {
      this.styleEl_.parentNode.removeChild(this.styleEl_);
      this.styleEl_ = null;
    }

    // Kill reference to this player
    Player.players[this.id_] = null;
    if (this.tag && this.tag.player) {
      this.tag.player = null;
    }
    if (this.el_ && this.el_.player) {
      this.el_.player = null;
    }
    if (this.tech_) {
      this.tech_.dispose();
      this.isPosterFromTech_ = false;
      this.poster_ = '';
    }
    if (this.playerElIngest_) {
      this.playerElIngest_ = null;
    }
    if (this.tag) {
      this.tag = null;
    }
    clearCacheForPlayer(this);

    // remove all event handlers for track lists
    // all tracks and track listeners are removed on
    // tech dispose
    ALL.names.forEach(name => {
      const props = ALL[name];
      const list = this[props.getterName]();

      // if it is not a native list
      // we have to manually remove event listeners
      if (list && list.off) {
        list.off();
      }
    });

    // the actual .el_ is removed here, or replaced if
    super.dispose({
      restoreEl: this.options_.restoreEl
    });
  }

  /**
   * Create the `Player`'s DOM element.
   *
   * @return {Element}
   *         The DOM element that gets created.
   */
  createEl() {
    let tag = this.tag;
    let el;
    let playerElIngest = this.playerElIngest_ = tag.parentNode && tag.parentNode.hasAttribute && tag.parentNode.hasAttribute('data-vjs-player');
    const divEmbed = this.tag.tagName.toLowerCase() === 'video-js';
    if (playerElIngest) {
      el = this.el_ = tag.parentNode;
    } else if (!divEmbed) {
      el = this.el_ = super.createEl('div');
    }

    // Copy over all the attributes from the tag, including ID and class
    // ID will now reference player box, not the video tag
    const attrs = getAttributes(tag);
    if (divEmbed) {
      el = this.el_ = tag;
      tag = this.tag = document.createElement('video');
      while (el.children.length) {
        tag.appendChild(el.firstChild);
      }
      if (!hasClass(el, 'video-js')) {
        addClass(el, 'video-js');
      }
      el.appendChild(tag);
      playerElIngest = this.playerElIngest_ = el;
      // move properties over from our custom `video-js` element
      // to our new `video` element. This will move things like
      // `src` or `controls` that were set via js before the player
      // was initialized.
      Object.keys(el).forEach(k => {
        try {
          tag[k] = el[k];
        } catch (e) {
          // we got a a property like outerHTML which we can't actually copy, ignore it
        }
      });
    }

    // set tabindex to -1 to remove the video element from the focus order
    tag.setAttribute('tabindex', '-1');
    attrs.tabindex = '-1';

    // Workaround for #4583 on Chrome (on Windows) with JAWS.
    // See https://github.com/FreedomScientific/VFO-standards-support/issues/78
    // Note that we can't detect if JAWS is being used, but this ARIA attribute
    // doesn't change behavior of Chrome if JAWS is not being used
    if (IS_CHROME && IS_WINDOWS) {
      tag.setAttribute('role', 'application');
      attrs.role = 'application';
    }

    // Remove width/height attrs from tag so CSS can make it 100% width/height
    tag.removeAttribute('width');
    tag.removeAttribute('height');
    if ('width' in attrs) {
      delete attrs.width;
    }
    if ('height' in attrs) {
      delete attrs.height;
    }
    Object.getOwnPropertyNames(attrs).forEach(function (attr) {
      // don't copy over the class attribute to the player element when we're in a div embed
      // the class is already set up properly in the divEmbed case
      // and we want to make sure that the `video-js` class doesn't get lost
      if (!(divEmbed && attr === 'class')) {
        el.setAttribute(attr, attrs[attr]);
      }
      if (divEmbed) {
        tag.setAttribute(attr, attrs[attr]);
      }
    });

    // Update tag id/class for use as HTML5 playback tech
    // Might think we should do this after embedding in container so .vjs-tech class
    // doesn't flash 100% width/height, but class only applies with .video-js parent
    tag.playerId = tag.id;
    tag.id += '_html5_api';
    tag.className = 'vjs-tech';

    // Make player findable on elements
    tag.player = el.player = this;
    // Default state of video is paused
    this.addClass('vjs-paused');

    // Add a style element in the player that we'll use to set the width/height
    // of the player in a way that's still overridable by CSS, just like the
    // video element
    if (window.VIDEOJS_NO_DYNAMIC_STYLE !== true) {
      this.styleEl_ = createStyleElement('vjs-styles-dimensions');
      const defaultsStyleEl = $('.vjs-styles-defaults');
      const head = $('head');
      head.insertBefore(this.styleEl_, defaultsStyleEl ? defaultsStyleEl.nextSibling : head.firstChild);
    }
    this.fill_ = false;
    this.fluid_ = false;

    // Pass in the width/height/aspectRatio options which will update the style el
    this.width(this.options_.width);
    this.height(this.options_.height);
    this.fill(this.options_.fill);
    this.fluid(this.options_.fluid);
    this.aspectRatio(this.options_.aspectRatio);
    // support both crossOrigin and crossorigin to reduce confusion and issues around the name
    this.crossOrigin(this.options_.crossOrigin || this.options_.crossorigin);

    // Hide any links within the video/audio tag,
    // because IE doesn't hide them completely from screen readers.
    const links = tag.getElementsByTagName('a');
    for (let i = 0; i < links.length; i++) {
      const linkEl = links.item(i);
      addClass(linkEl, 'vjs-hidden');
      linkEl.setAttribute('hidden', 'hidden');
    }

    // insertElFirst seems to cause the networkState to flicker from 3 to 2, so
    // keep track of the original for later so we can know if the source originally failed
    tag.initNetworkState_ = tag.networkState;

    // Wrap video tag in div (el/box) container
    if (tag.parentNode && !playerElIngest) {
      tag.parentNode.insertBefore(el, tag);
    }

    // insert the tag as the first child of the player element
    // then manually add it to the children array so that this.addChild
    // will work properly for other components
    //
    // Breaks iPhone, fixed in HTML5 setup.
    prependTo(tag, el);
    this.children_.unshift(tag);

    // Set lang attr on player to ensure CSS :lang() in consistent with player
    // if it's been set to something different to the doc
    this.el_.setAttribute('lang', this.language_);
    this.el_.setAttribute('translate', 'no');
    this.el_ = el;
    return el;
  }

  /**
   * Get or set the `Player`'s crossOrigin option. For the HTML5 player, this
   * sets the `crossOrigin` property on the `<video>` tag to control the CORS
   * behavior.
   *
   * @see [Video Element Attributes]{@link https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video#attr-crossorigin}
   *
   * @param {string|null} [value]
   *        The value to set the `Player`'s crossOrigin to. If an argument is
   *        given, must be one of `'anonymous'` or `'use-credentials'`, or 'null'.
   *
   * @return {string|null|undefined}
   *         - The current crossOrigin value of the `Player` when getting.
   *         - undefined when setting
   */
  crossOrigin(value) {
    // `null` can be set to unset a value
    if (typeof value === 'undefined') {
      return this.techGet_('crossOrigin');
    }
    if (value !== null && value !== 'anonymous' && value !== 'use-credentials') {
      log.warn(`crossOrigin must be null,  "anonymous" or "use-credentials", given "${value}"`);
      return;
    }
    this.techCall_('setCrossOrigin', value);
    if (this.posterImage) {
      this.posterImage.crossOrigin(value);
    }
    return;
  }

  /**
   * A getter/setter for the `Player`'s width. Returns the player's configured value.
   * To get the current width use `currentWidth()`.
   *
   * @param {number} [value]
   *        The value to set the `Player`'s width to.
   *
   * @return {number}
   *         The current width of the `Player` when getting.
   */
  width(value) {
    return this.dimension('width', value);
  }

  /**
   * A getter/setter for the `Player`'s height. Returns the player's configured value.
   * To get the current height use `currentheight()`.
   *
   * @param {number} [value]
   *        The value to set the `Player`'s height to.
   *
   * @return {number}
   *         The current height of the `Player` when getting.
   */
  height(value) {
    return this.dimension('height', value);
  }

  /**
   * A getter/setter for the `Player`'s width & height.
   *
   * @param {string} dimension
   *        This string can be:
   *        - 'width'
   *        - 'height'
   *
   * @param {number} [value]
   *        Value for dimension specified in the first argument.
   *
   * @return {number}
   *         The dimension arguments value when getting (width/height).
   */
  dimension(dimension, value) {
    const privDimension = dimension + '_';
    if (value === undefined) {
      return this[privDimension] || 0;
    }
    if (value === '' || value === 'auto') {
      // If an empty string is given, reset the dimension to be automatic
      this[privDimension] = undefined;
      this.updateStyleEl_();
      return;
    }
    const parsedVal = parseFloat(value);
    if (isNaN(parsedVal)) {
      log.error(`Improper value "${value}" supplied for for ${dimension}`);
      return;
    }
    this[privDimension] = parsedVal;
    this.updateStyleEl_();
  }

  /**
   * A getter/setter/toggler for the vjs-fluid `className` on the `Player`.
   *
   * Turning this on will turn off fill mode.
   *
   * @param {boolean} [bool]
   *        - A value of true adds the class.
   *        - A value of false removes the class.
   *        - No value will be a getter.
   *
   * @return {boolean|undefined}
   *         - The value of fluid when getting.
   *         - `undefined` when setting.
   */
  fluid(bool) {
    if (bool === undefined) {
      return !!this.fluid_;
    }
    this.fluid_ = !!bool;
    if (isEvented(this)) {
      this.off(['playerreset', 'resize'], this.boundUpdateStyleEl_);
    }
    if (bool) {
      this.addClass('vjs-fluid');
      this.fill(false);
      addEventedCallback(this, () => {
        this.on(['playerreset', 'resize'], this.boundUpdateStyleEl_);
      });
    } else {
      this.removeClass('vjs-fluid');
    }
    this.updateStyleEl_();
  }

  /**
   * A getter/setter/toggler for the vjs-fill `className` on the `Player`.
   *
   * Turning this on will turn off fluid mode.
   *
   * @param {boolean} [bool]
   *        - A value of true adds the class.
   *        - A value of false removes the class.
   *        - No value will be a getter.
   *
   * @return {boolean|undefined}
   *         - The value of fluid when getting.
   *         - `undefined` when setting.
   */
  fill(bool) {
    if (bool === undefined) {
      return !!this.fill_;
    }
    this.fill_ = !!bool;
    if (bool) {
      this.addClass('vjs-fill');
      this.fluid(false);
    } else {
      this.removeClass('vjs-fill');
    }
  }

  /**
   * Get/Set the aspect ratio
   *
   * @param {string} [ratio]
   *        Aspect ratio for player
   *
   * @return {string|undefined}
   *         returns the current aspect ratio when getting
   */

  /**
   * A getter/setter for the `Player`'s aspect ratio.
   *
   * @param {string} [ratio]
   *        The value to set the `Player`'s aspect ratio to.
   *
   * @return {string|undefined}
   *         - The current aspect ratio of the `Player` when getting.
   *         - undefined when setting
   */
  aspectRatio(ratio) {
    if (ratio === undefined) {
      return this.aspectRatio_;
    }

    // Check for width:height format
    if (!/^\d+\:\d+$/.test(ratio)) {
      throw new Error('Improper value supplied for aspect ratio. The format should be width:height, for example 16:9.');
    }
    this.aspectRatio_ = ratio;

    // We're assuming if you set an aspect ratio you want fluid mode,
    // because in fixed mode you could calculate width and height yourself.
    this.fluid(true);
    this.updateStyleEl_();
  }

  /**
   * Update styles of the `Player` element (height, width and aspect ratio).
   *
   * @private
   * @listens Tech#loadedmetadata
   */
  updateStyleEl_() {
    if (window.VIDEOJS_NO_DYNAMIC_STYLE === true) {
      const width = typeof this.width_ === 'number' ? this.width_ : this.options_.width;
      const height = typeof this.height_ === 'number' ? this.height_ : this.options_.height;
      const techEl = this.tech_ && this.tech_.el();
      if (techEl) {
        if (width >= 0) {
          techEl.width = width;
        }
        if (height >= 0) {
          techEl.height = height;
        }
      }
      return;
    }
    let width;
    let height;
    let aspectRatio;
    let idClass;

    // The aspect ratio is either used directly or to calculate width and height.
    if (this.aspectRatio_ !== undefined && this.aspectRatio_ !== 'auto') {
      // Use any aspectRatio that's been specifically set
      aspectRatio = this.aspectRatio_;
    } else if (this.videoWidth() > 0) {
      // Otherwise try to get the aspect ratio from the video metadata
      aspectRatio = this.videoWidth() + ':' + this.videoHeight();
    } else {
      // Or use a default. The video element's is 2:1, but 16:9 is more common.
      aspectRatio = '16:9';
    }

    // Get the ratio as a decimal we can use to calculate dimensions
    const ratioParts = aspectRatio.split(':');
    const ratioMultiplier = ratioParts[1] / ratioParts[0];
    if (this.width_ !== undefined) {
      // Use any width that's been specifically set
      width = this.width_;
    } else if (this.height_ !== undefined) {
      // Or calculate the width from the aspect ratio if a height has been set
      width = this.height_ / ratioMultiplier;
    } else {
      // Or use the video's metadata, or use the video el's default of 300
      width = this.videoWidth() || 300;
    }
    if (this.height_ !== undefined) {
      // Use any height that's been specifically set
      height = this.height_;
    } else {
      // Otherwise calculate the height from the ratio and the width
      height = width * ratioMultiplier;
    }

    // Ensure the CSS class is valid by starting with an alpha character
    if (/^[^a-zA-Z]/.test(this.id())) {
      idClass = 'dimensions-' + this.id();
    } else {
      idClass = this.id() + '-dimensions';
    }

    // Ensure the right class is still on the player for the style element
    this.addClass(idClass);
    setTextContent(this.styleEl_, `
      .${idClass} {
        width: ${width}px;
        height: ${height}px;
      }

      .${idClass}.vjs-fluid:not(.vjs-audio-only-mode) {
        padding-top: ${ratioMultiplier * 100}%;
      }
    `);
  }

  /**
   * Load/Create an instance of playback {@link Tech} including element
   * and API methods. Then append the `Tech` element in `Player` as a child.
   *
   * @param {string} techName
   *        name of the playback technology
   *
   * @param {string} source
   *        video source
   *
   * @private
   */
  loadTech_(techName, source) {
    // Pause and remove current playback technology
    if (this.tech_) {
      this.unloadTech_();
    }
    const titleTechName = toTitleCase(techName);
    const camelTechName = techName.charAt(0).toLowerCase() + techName.slice(1);

    // get rid of the HTML5 video tag as soon as we are using another tech
    if (titleTechName !== 'Html5' && this.tag) {
      Tech.getTech('Html5').disposeMediaElement(this.tag);
      this.tag.player = null;
      this.tag = null;
    }
    this.techName_ = titleTechName;

    // Turn off API access because we're loading a new tech that might load asynchronously
    this.isReady_ = false;
    let autoplay = this.autoplay();

    // if autoplay is a string (or `true` with normalizeAutoplay: true) we pass false to the tech
    // because the player is going to handle autoplay on `loadstart`
    if (typeof this.autoplay() === 'string' || this.autoplay() === true && this.options_.normalizeAutoplay) {
      autoplay = false;
    }

    // Grab tech-specific options from player options and add source and parent element to use.
    const techOptions = {
      source,
      autoplay,
      'nativeControlsForTouch': this.options_.nativeControlsForTouch,
      'playerId': this.id(),
      'techId': `${this.id()}_${camelTechName}_api`,
      'playsinline': this.options_.playsinline,
      'preload': this.options_.preload,
      'loop': this.options_.loop,
      'disablePictureInPicture': this.options_.disablePictureInPicture,
      'muted': this.options_.muted,
      'poster': this.poster(),
      'language': this.language(),
      'playerElIngest': this.playerElIngest_ || false,
      'vtt.js': this.options_['vtt.js'],
      'canOverridePoster': !!this.options_.techCanOverridePoster,
      'enableSourceset': this.options_.enableSourceset
    };
    ALL.names.forEach(name => {
      const props = ALL[name];
      techOptions[props.getterName] = this[props.privateName];
    });
    Object.assign(techOptions, this.options_[titleTechName]);
    Object.assign(techOptions, this.options_[camelTechName]);
    Object.assign(techOptions, this.options_[techName.toLowerCase()]);
    if (this.tag) {
      techOptions.tag = this.tag;
    }
    if (source && source.src === this.cache_.src && this.cache_.currentTime > 0) {
      techOptions.startTime = this.cache_.currentTime;
    }

    // Initialize tech instance
    const TechClass = Tech.getTech(techName);
    if (!TechClass) {
      throw new Error(`No Tech named '${titleTechName}' exists! '${titleTechName}' should be registered using videojs.registerTech()'`);
    }
    this.tech_ = new TechClass(techOptions);

    // player.triggerReady is always async, so don't need this to be async
    this.tech_.ready(bind_(this, this.handleTechReady_), true);
    textTrackConverter.jsonToTextTracks(this.textTracksJson_ || [], this.tech_);

    // Listen to all HTML5-defined events and trigger them on the player
    TECH_EVENTS_RETRIGGER.forEach(event => {
      this.on(this.tech_, event, e => this[`handleTech${toTitleCase(event)}_`](e));
    });
    Object.keys(TECH_EVENTS_QUEUE).forEach(event => {
      this.on(this.tech_, event, eventObj => {
        if (this.tech_.playbackRate() === 0 && this.tech_.seeking()) {
          this.queuedCallbacks_.push({
            callback: this[`handleTech${TECH_EVENTS_QUEUE[event]}_`].bind(this),
            event: eventObj
          });
          return;
        }
        this[`handleTech${TECH_EVENTS_QUEUE[event]}_`](eventObj);
      });
    });
    this.on(this.tech_, 'loadstart', e => this.handleTechLoadStart_(e));
    this.on(this.tech_, 'sourceset', e => this.handleTechSourceset_(e));
    this.on(this.tech_, 'waiting', e => this.handleTechWaiting_(e));
    this.on(this.tech_, 'ended', e => this.handleTechEnded_(e));
    this.on(this.tech_, 'seeking', e => this.handleTechSeeking_(e));
    this.on(this.tech_, 'play', e => this.handleTechPlay_(e));
    this.on(this.tech_, 'pause', e => this.handleTechPause_(e));
    this.on(this.tech_, 'durationchange', e => this.handleTechDurationChange_(e));
    this.on(this.tech_, 'fullscreenchange', (e, data) => this.handleTechFullscreenChange_(e, data));
    this.on(this.tech_, 'fullscreenerror', (e, err) => this.handleTechFullscreenError_(e, err));
    this.on(this.tech_, 'enterpictureinpicture', e => this.handleTechEnterPictureInPicture_(e));
    this.on(this.tech_, 'leavepictureinpicture', e => this.handleTechLeavePictureInPicture_(e));
    this.on(this.tech_, 'error', e => this.handleTechError_(e));
    this.on(this.tech_, 'posterchange', e => this.handleTechPosterChange_(e));
    this.on(this.tech_, 'textdata', e => this.handleTechTextData_(e));
    this.on(this.tech_, 'ratechange', e => this.handleTechRateChange_(e));
    this.on(this.tech_, 'loadedmetadata', this.boundUpdateStyleEl_);
    this.usingNativeControls(this.techGet_('controls'));
    if (this.controls() && !this.usingNativeControls()) {
      this.addTechControlsListeners_();
    }

    // Add the tech element in the DOM if it was not already there
    // Make sure to not insert the original video element if using Html5
    if (this.tech_.el().parentNode !== this.el() && (titleTechName !== 'Html5' || !this.tag)) {
      prependTo(this.tech_.el(), this.el());
    }

    // Get rid of the original video tag reference after the first tech is loaded
    if (this.tag) {
      this.tag.player = null;
      this.tag = null;
    }
  }

  /**
   * Unload and dispose of the current playback {@link Tech}.
   *
   * @private
   */
  unloadTech_() {
    // Save the current text tracks so that we can reuse the same text tracks with the next tech
    ALL.names.forEach(name => {
      const props = ALL[name];
      this[props.privateName] = this[props.getterName]();
    });
    this.textTracksJson_ = textTrackConverter.textTracksToJson(this.tech_);
    this.isReady_ = false;
    this.tech_.dispose();
    this.tech_ = false;
    if (this.isPosterFromTech_) {
      this.poster_ = '';
      this.trigger('posterchange');
    }
    this.isPosterFromTech_ = false;
  }

  /**
   * Return a reference to the current {@link Tech}.
   * It will print a warning by default about the danger of using the tech directly
   * but any argument that is passed in will silence the warning.
   *
   * @param {*} [safety]
   *        Anything passed in to silence the warning
   *
   * @return {Tech}
   *         The Tech
   */
  tech(safety) {
    if (safety === undefined) {
      log.warn('Using the tech directly can be dangerous. I hope you know what you\'re doing.\n' + 'See https://github.com/videojs/video.js/issues/2617 for more info.\n');
    }
    return this.tech_;
  }

  /**
   * Set up click and touch listeners for the playback element
   *
   * - On desktops: a click on the video itself will toggle playback
   * - On mobile devices: a click on the video toggles controls
   *   which is done by toggling the user state between active and
   *   inactive
   * - A tap can signal that a user has become active or has become inactive
   *   e.g. a quick tap on an iPhone movie should reveal the controls. Another
   *   quick tap should hide them again (signaling the user is in an inactive
   *   viewing state)
   * - In addition to this, we still want the user to be considered inactive after
   *   a few seconds of inactivity.
   *
   * > Note: the only part of iOS interaction we can't mimic with this setup
   * is a touch and hold on the video element counting as activity in order to
   * keep the controls showing, but that shouldn't be an issue. A touch and hold
   * on any controls will still keep the user active
   *
   * @private
   */
  addTechControlsListeners_() {
    // Make sure to remove all the previous listeners in case we are called multiple times.
    this.removeTechControlsListeners_();
    this.on(this.tech_, 'click', this.boundHandleTechClick_);
    this.on(this.tech_, 'dblclick', this.boundHandleTechDoubleClick_);

    // If the controls were hidden we don't want that to change without a tap event
    // so we'll check if the controls were already showing before reporting user
    // activity
    this.on(this.tech_, 'touchstart', this.boundHandleTechTouchStart_);
    this.on(this.tech_, 'touchmove', this.boundHandleTechTouchMove_);
    this.on(this.tech_, 'touchend', this.boundHandleTechTouchEnd_);

    // The tap listener needs to come after the touchend listener because the tap
    // listener cancels out any reportedUserActivity when setting userActive(false)
    this.on(this.tech_, 'tap', this.boundHandleTechTap_);
  }

  /**
   * Remove the listeners used for click and tap controls. This is needed for
   * toggling to controls disabled, where a tap/touch should do nothing.
   *
   * @private
   */
  removeTechControlsListeners_() {
    // We don't want to just use `this.off()` because there might be other needed
    // listeners added by techs that extend this.
    this.off(this.tech_, 'tap', this.boundHandleTechTap_);
    this.off(this.tech_, 'touchstart', this.boundHandleTechTouchStart_);
    this.off(this.tech_, 'touchmove', this.boundHandleTechTouchMove_);
    this.off(this.tech_, 'touchend', this.boundHandleTechTouchEnd_);
    this.off(this.tech_, 'click', this.boundHandleTechClick_);
    this.off(this.tech_, 'dblclick', this.boundHandleTechDoubleClick_);
  }

  /**
   * Player waits for the tech to be ready
   *
   * @private
   */
  handleTechReady_() {
    this.triggerReady();

    // Keep the same volume as before
    if (this.cache_.volume) {
      this.techCall_('setVolume', this.cache_.volume);
    }

    // Look if the tech found a higher resolution poster while loading
    this.handleTechPosterChange_();

    // Update the duration if available
    this.handleTechDurationChange_();
  }

  /**
   * Retrigger the `loadstart` event that was triggered by the {@link Tech}.
   *
   * @fires Player#loadstart
   * @listens Tech#loadstart
   * @private
   */
  handleTechLoadStart_() {
    // TODO: Update to use `emptied` event instead. See #1277.

    this.removeClass('vjs-ended', 'vjs-seeking');

    // reset the error state
    this.error(null);

    // Update the duration
    this.handleTechDurationChange_();
    if (!this.paused()) {
      /**
       * Fired when the user agent begins looking for media data
       *
       * @event Player#loadstart
       * @type {Event}
       */
      this.trigger('loadstart');
    } else {
      // reset the hasStarted state
      this.hasStarted(false);
      this.trigger('loadstart');
    }

    // autoplay happens after loadstart for the browser,
    // so we mimic that behavior
    this.manualAutoplay_(this.autoplay() === true && this.options_.normalizeAutoplay ? 'play' : this.autoplay());
  }

  /**
   * Handle autoplay string values, rather than the typical boolean
   * values that should be handled by the tech. Note that this is not
   * part of any specification. Valid values and what they do can be
   * found on the autoplay getter at Player#autoplay()
   */
  manualAutoplay_(type) {
    if (!this.tech_ || typeof type !== 'string') {
      return;
    }

    // Save original muted() value, set muted to true, and attempt to play().
    // On promise rejection, restore muted from saved value
    const resolveMuted = () => {
      const previouslyMuted = this.muted();
      this.muted(true);
      const restoreMuted = () => {
        this.muted(previouslyMuted);
      };

      // restore muted on play terminatation
      this.playTerminatedQueue_.push(restoreMuted);
      const mutedPromise = this.play();
      if (!isPromise(mutedPromise)) {
        return;
      }
      return mutedPromise.catch(err => {
        restoreMuted();
        throw new Error(`Rejection at manualAutoplay. Restoring muted value. ${err ? err : ''}`);
      });
    };
    let promise;

    // if muted defaults to true
    // the only thing we can do is call play
    if (type === 'any' && !this.muted()) {
      promise = this.play();
      if (isPromise(promise)) {
        promise = promise.catch(resolveMuted);
      }
    } else if (type === 'muted' && !this.muted()) {
      promise = resolveMuted();
    } else {
      promise = this.play();
    }
    if (!isPromise(promise)) {
      return;
    }
    return promise.then(() => {
      this.trigger({
        type: 'autoplay-success',
        autoplay: type
      });
    }).catch(() => {
      this.trigger({
        type: 'autoplay-failure',
        autoplay: type
      });
    });
  }

  /**
   * Update the internal source caches so that we return the correct source from
   * `src()`, `currentSource()`, and `currentSources()`.
   *
   * > Note: `currentSources` will not be updated if the source that is passed in exists
   *         in the current `currentSources` cache.
   *
   *
   * @param {Tech~SourceObject} srcObj
   *        A string or object source to update our caches to.
   */
  updateSourceCaches_(srcObj = '') {
    let src = srcObj;
    let type = '';
    if (typeof src !== 'string') {
      src = srcObj.src;
      type = srcObj.type;
    }

    // make sure all the caches are set to default values
    // to prevent null checking
    this.cache_.source = this.cache_.source || {};
    this.cache_.sources = this.cache_.sources || [];

    // try to get the type of the src that was passed in
    if (src && !type) {
      type = findMimetype(this, src);
    }

    // update `currentSource` cache always
    this.cache_.source = merge({}, srcObj, {
      src,
      type
    });
    const matchingSources = this.cache_.sources.filter(s => s.src && s.src === src);
    const sourceElSources = [];
    const sourceEls = this.$$('source');
    const matchingSourceEls = [];
    for (let i = 0; i < sourceEls.length; i++) {
      const sourceObj = getAttributes(sourceEls[i]);
      sourceElSources.push(sourceObj);
      if (sourceObj.src && sourceObj.src === src) {
        matchingSourceEls.push(sourceObj.src);
      }
    }

    // if we have matching source els but not matching sources
    // the current source cache is not up to date
    if (matchingSourceEls.length && !matchingSources.length) {
      this.cache_.sources = sourceElSources;
      // if we don't have matching source or source els set the
      // sources cache to the `currentSource` cache
    } else if (!matchingSources.length) {
      this.cache_.sources = [this.cache_.source];
    }

    // update the tech `src` cache
    this.cache_.src = src;
  }

  /**
   * *EXPERIMENTAL* Fired when the source is set or changed on the {@link Tech}
   * causing the media element to reload.
   *
   * It will fire for the initial source and each subsequent source.
   * This event is a custom event from Video.js and is triggered by the {@link Tech}.
   *
   * The event object for this event contains a `src` property that will contain the source
   * that was available when the event was triggered. This is generally only necessary if Video.js
   * is switching techs while the source was being changed.
   *
   * It is also fired when `load` is called on the player (or media element)
   * because the {@link https://html.spec.whatwg.org/multipage/media.html#dom-media-load|specification for `load`}
   * says that the resource selection algorithm needs to be aborted and restarted.
   * In this case, it is very likely that the `src` property will be set to the
   * empty string `""` to indicate we do not know what the source will be but
   * that it is changing.
   *
   * *This event is currently still experimental and may change in minor releases.*
   * __To use this, pass `enableSourceset` option to the player.__
   *
   * @event Player#sourceset
   * @type {Event}
   * @prop {string} src
   *                The source url available when the `sourceset` was triggered.
   *                It will be an empty string if we cannot know what the source is
   *                but know that the source will change.
   */
  /**
   * Retrigger the `sourceset` event that was triggered by the {@link Tech}.
   *
   * @fires Player#sourceset
   * @listens Tech#sourceset
   * @private
   */
  handleTechSourceset_(event) {
    // only update the source cache when the source
    // was not updated using the player api
    if (!this.changingSrc_) {
      let updateSourceCaches = src => this.updateSourceCaches_(src);
      const playerSrc = this.currentSource().src;
      const eventSrc = event.src;

      // if we have a playerSrc that is not a blob, and a tech src that is a blob
      if (playerSrc && !/^blob:/.test(playerSrc) && /^blob:/.test(eventSrc)) {
        // if both the tech source and the player source were updated we assume
        // something like @videojs/http-streaming did the sourceset and skip updating the source cache.
        if (!this.lastSource_ || this.lastSource_.tech !== eventSrc && this.lastSource_.player !== playerSrc) {
          updateSourceCaches = () => {};
        }
      }

      // update the source to the initial source right away
      // in some cases this will be empty string
      updateSourceCaches(eventSrc);

      // if the `sourceset` `src` was an empty string
      // wait for a `loadstart` to update the cache to `currentSrc`.
      // If a sourceset happens before a `loadstart`, we reset the state
      if (!event.src) {
        this.tech_.any(['sourceset', 'loadstart'], e => {
          // if a sourceset happens before a `loadstart` there
          // is nothing to do as this `handleTechSourceset_`
          // will be called again and this will be handled there.
          if (e.type === 'sourceset') {
            return;
          }
          const techSrc = this.techGet('currentSrc');
          this.lastSource_.tech = techSrc;
          this.updateSourceCaches_(techSrc);
        });
      }
    }
    this.lastSource_ = {
      player: this.currentSource().src,
      tech: event.src
    };
    this.trigger({
      src: event.src,
      type: 'sourceset'
    });
  }

  /**
   * Add/remove the vjs-has-started class
   *
   *
   * @param {boolean} request
   *        - true: adds the class
   *        - false: remove the class
   *
   * @return {boolean}
   *         the boolean value of hasStarted_
   */
  hasStarted(request) {
    if (request === undefined) {
      // act as getter, if we have no request to change
      return this.hasStarted_;
    }
    if (request === this.hasStarted_) {
      return;
    }
    this.hasStarted_ = request;
    if (this.hasStarted_) {
      this.addClass('vjs-has-started');
    } else {
      this.removeClass('vjs-has-started');
    }
  }

  /**
   * Fired whenever the media begins or resumes playback
   *
   * @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#dom-media-play}
   * @fires Player#play
   * @listens Tech#play
   * @private
   */
  handleTechPlay_() {
    this.removeClass('vjs-ended', 'vjs-paused');
    this.addClass('vjs-playing');

    // hide the poster when the user hits play
    this.hasStarted(true);
    /**
     * Triggered whenever an {@link Tech#play} event happens. Indicates that
     * playback has started or resumed.
     *
     * @event Player#play
     * @type {Event}
     */
    this.trigger('play');
  }

  /**
   * Retrigger the `ratechange` event that was triggered by the {@link Tech}.
   *
   * If there were any events queued while the playback rate was zero, fire
   * those events now.
   *
   * @private
   * @method Player#handleTechRateChange_
   * @fires Player#ratechange
   * @listens Tech#ratechange
   */
  handleTechRateChange_() {
    if (this.tech_.playbackRate() > 0 && this.cache_.lastPlaybackRate === 0) {
      this.queuedCallbacks_.forEach(queued => queued.callback(queued.event));
      this.queuedCallbacks_ = [];
    }
    this.cache_.lastPlaybackRate = this.tech_.playbackRate();
    /**
     * Fires when the playing speed of the audio/video is changed
     *
     * @event Player#ratechange
     * @type {event}
     */
    this.trigger('ratechange');
  }

  /**
   * Retrigger the `waiting` event that was triggered by the {@link Tech}.
   *
   * @fires Player#waiting
   * @listens Tech#waiting
   * @private
   */
  handleTechWaiting_() {
    this.addClass('vjs-waiting');
    /**
     * A readyState change on the DOM element has caused playback to stop.
     *
     * @event Player#waiting
     * @type {Event}
     */
    this.trigger('waiting');

    // Browsers may emit a timeupdate event after a waiting event. In order to prevent
    // premature removal of the waiting class, wait for the time to change.
    const timeWhenWaiting = this.currentTime();
    const timeUpdateListener = () => {
      if (timeWhenWaiting !== this.currentTime()) {
        this.removeClass('vjs-waiting');
        this.off('timeupdate', timeUpdateListener);
      }
    };
    this.on('timeupdate', timeUpdateListener);
  }

  /**
   * Retrigger the `canplay` event that was triggered by the {@link Tech}.
   * > Note: This is not consistent between browsers. See #1351
   *
   * @fires Player#canplay
   * @listens Tech#canplay
   * @private
   */
  handleTechCanPlay_() {
    this.removeClass('vjs-waiting');
    /**
     * The media has a readyState of HAVE_FUTURE_DATA or greater.
     *
     * @event Player#canplay
     * @type {Event}
     */
    this.trigger('canplay');
  }

  /**
   * Retrigger the `canplaythrough` event that was triggered by the {@link Tech}.
   *
   * @fires Player#canplaythrough
   * @listens Tech#canplaythrough
   * @private
   */
  handleTechCanPlayThrough_() {
    this.removeClass('vjs-waiting');
    /**
     * The media has a readyState of HAVE_ENOUGH_DATA or greater. This means that the
     * entire media file can be played without buffering.
     *
     * @event Player#canplaythrough
     * @type {Event}
     */
    this.trigger('canplaythrough');
  }

  /**
   * Retrigger the `playing` event that was triggered by the {@link Tech}.
   *
   * @fires Player#playing
   * @listens Tech#playing
   * @private
   */
  handleTechPlaying_() {
    this.removeClass('vjs-waiting');
    /**
     * The media is no longer blocked from playback, and has started playing.
     *
     * @event Player#playing
     * @type {Event}
     */
    this.trigger('playing');
  }

  /**
   * Retrigger the `seeking` event that was triggered by the {@link Tech}.
   *
   * @fires Player#seeking
   * @listens Tech#seeking
   * @private
   */
  handleTechSeeking_() {
    this.addClass('vjs-seeking');
    /**
     * Fired whenever the player is jumping to a new time
     *
     * @event Player#seeking
     * @type {Event}
     */
    this.trigger('seeking');
  }

  /**
   * Retrigger the `seeked` event that was triggered by the {@link Tech}.
   *
   * @fires Player#seeked
   * @listens Tech#seeked
   * @private
   */
  handleTechSeeked_() {
    this.removeClass('vjs-seeking', 'vjs-ended');
    /**
     * Fired when the player has finished jumping to a new time
     *
     * @event Player#seeked
     * @type {Event}
     */
    this.trigger('seeked');
  }

  /**
   * Retrigger the `pause` event that was triggered by the {@link Tech}.
   *
   * @fires Player#pause
   * @listens Tech#pause
   * @private
   */
  handleTechPause_() {
    this.removeClass('vjs-playing');
    this.addClass('vjs-paused');
    /**
     * Fired whenever the media has been paused
     *
     * @event Player#pause
     * @type {Event}
     */
    this.trigger('pause');
  }

  /**
   * Retrigger the `ended` event that was triggered by the {@link Tech}.
   *
   * @fires Player#ended
   * @listens Tech#ended
   * @private
   */
  handleTechEnded_() {
    this.addClass('vjs-ended');
    this.removeClass('vjs-waiting');
    if (this.options_.loop) {
      this.currentTime(0);
      this.play();
    } else if (!this.paused()) {
      this.pause();
    }

    /**
     * Fired when the end of the media resource is reached (currentTime == duration)
     *
     * @event Player#ended
     * @type {Event}
     */
    this.trigger('ended');
  }

  /**
   * Fired when the duration of the media resource is first known or changed
   *
   * @listens Tech#durationchange
   * @private
   */
  handleTechDurationChange_() {
    this.duration(this.techGet_('duration'));
  }

  /**
   * Handle a click on the media element to play/pause
   *
   * @param {Event} event
   *        the event that caused this function to trigger
   *
   * @listens Tech#click
   * @private
   */
  handleTechClick_(event) {
    // When controls are disabled a click should not toggle playback because
    // the click is considered a control
    if (!this.controls_) {
      return;
    }
    if (this.options_ === undefined || this.options_.userActions === undefined || this.options_.userActions.click === undefined || this.options_.userActions.click !== false) {
      if (this.options_ !== undefined && this.options_.userActions !== undefined && typeof this.options_.userActions.click === 'function') {
        this.options_.userActions.click.call(this, event);
      } else if (this.paused()) {
        silencePromise(this.play());
      } else {
        this.pause();
      }
    }
  }

  /**
   * Handle a double-click on the media element to enter/exit fullscreen
   *
   * @param {Event} event
   *        the event that caused this function to trigger
   *
   * @listens Tech#dblclick
   * @private
   */
  handleTechDoubleClick_(event) {
    if (!this.controls_) {
      return;
    }

    // we do not want to toggle fullscreen state
    // when double-clicking inside a control bar or a modal
    const inAllowedEls = Array.prototype.some.call(this.$$('.vjs-control-bar, .vjs-modal-dialog'), el => el.contains(event.target));
    if (!inAllowedEls) {
      /*
       * options.userActions.doubleClick
       *
       * If `undefined` or `true`, double-click toggles fullscreen if controls are present
       * Set to `false` to disable double-click handling
       * Set to a function to substitute an external double-click handler
       */
      if (this.options_ === undefined || this.options_.userActions === undefined || this.options_.userActions.doubleClick === undefined || this.options_.userActions.doubleClick !== false) {
        if (this.options_ !== undefined && this.options_.userActions !== undefined && typeof this.options_.userActions.doubleClick === 'function') {
          this.options_.userActions.doubleClick.call(this, event);
        } else if (this.isFullscreen()) {
          this.exitFullscreen();
        } else {
          this.requestFullscreen();
        }
      }
    }
  }

  /**
   * Handle a tap on the media element. It will toggle the user
   * activity state, which hides and shows the controls.
   *
   * @listens Tech#tap
   * @private
   */
  handleTechTap_() {
    this.userActive(!this.userActive());
  }

  /**
   * Handle touch to start
   *
   * @listens Tech#touchstart
   * @private
   */
  handleTechTouchStart_() {
    this.userWasActive = this.userActive();
  }

  /**
   * Handle touch to move
   *
   * @listens Tech#touchmove
   * @private
   */
  handleTechTouchMove_() {
    if (this.userWasActive) {
      this.reportUserActivity();
    }
  }

  /**
   * Handle touch to end
   *
   * @param {Event} event
   *        the touchend event that triggered
   *        this function
   *
   * @listens Tech#touchend
   * @private
   */
  handleTechTouchEnd_(event) {
    // Stop the mouse events from also happening
    if (event.cancelable) {
      event.preventDefault();
    }
  }

  /**
   * @private
   */
  toggleFullscreenClass_() {
    if (this.isFullscreen()) {
      this.addClass('vjs-fullscreen');
    } else {
      this.removeClass('vjs-fullscreen');
    }
  }

  /**
   * when the document fschange event triggers it calls this
   */
  documentFullscreenChange_(e) {
    const targetPlayer = e.target.player;

    // if another player was fullscreen
    // do a null check for targetPlayer because older firefox's would put document as e.target
    if (targetPlayer && targetPlayer !== this) {
      return;
    }
    const el = this.el();
    let isFs = document[this.fsApi_.fullscreenElement] === el;
    if (!isFs && el.matches) {
      isFs = el.matches(':' + this.fsApi_.fullscreen);
    } else if (!isFs && el.msMatchesSelector) {
      isFs = el.msMatchesSelector(':' + this.fsApi_.fullscreen);
    }
    this.isFullscreen(isFs);
  }

  /**
   * Handle Tech Fullscreen Change
   *
   * @param {Event} event
   *        the fullscreenchange event that triggered this function
   *
   * @param {Object} data
   *        the data that was sent with the event
   *
   * @private
   * @listens Tech#fullscreenchange
   * @fires Player#fullscreenchange
   */
  handleTechFullscreenChange_(event, data) {
    if (data) {
      if (data.nativeIOSFullscreen) {
        this.addClass('vjs-ios-native-fs');
        this.tech_.one('webkitendfullscreen', () => {
          this.removeClass('vjs-ios-native-fs');
        });
      }
      this.isFullscreen(data.isFullscreen);
    }
  }
  handleTechFullscreenError_(event, err) {
    this.trigger('fullscreenerror', err);
  }

  /**
   * @private
   */
  togglePictureInPictureClass_() {
    if (this.isInPictureInPicture()) {
      this.addClass('vjs-picture-in-picture');
    } else {
      this.removeClass('vjs-picture-in-picture');
    }
  }

  /**
   * Handle Tech Enter Picture-in-Picture.
   *
   * @param {Event} event
   *        the enterpictureinpicture event that triggered this function
   *
   * @private
   * @listens Tech#enterpictureinpicture
   */
  handleTechEnterPictureInPicture_(event) {
    this.isInPictureInPicture(true);
  }

  /**
   * Handle Tech Leave Picture-in-Picture.
   *
   * @param {Event} event
   *        the leavepictureinpicture event that triggered this function
   *
   * @private
   * @listens Tech#leavepictureinpicture
   */
  handleTechLeavePictureInPicture_(event) {
    this.isInPictureInPicture(false);
  }

  /**
   * Fires when an error occurred during the loading of an audio/video.
   *
   * @private
   * @listens Tech#error
   */
  handleTechError_() {
    const error = this.tech_.error();
    this.error(error);
  }

  /**
   * Retrigger the `textdata` event that was triggered by the {@link Tech}.
   *
   * @fires Player#textdata
   * @listens Tech#textdata
   * @private
   */
  handleTechTextData_() {
    let data = null;
    if (arguments.length > 1) {
      data = arguments[1];
    }

    /**
     * Fires when we get a textdata event from tech
     *
     * @event Player#textdata
     * @type {Event}
     */
    this.trigger('textdata', data);
  }

  /**
   * Get object for cached values.
   *
   * @return {Object}
   *         get the current object cache
   */
  getCache() {
    return this.cache_;
  }

  /**
   * Resets the internal cache object.
   *
   * Using this function outside the player constructor or reset method may
   * have unintended side-effects.
   *
   * @private
   */
  resetCache_() {
    this.cache_ = {
      // Right now, the currentTime is not _really_ cached because it is always
      // retrieved from the tech (see: currentTime). However, for completeness,
      // we set it to zero here to ensure that if we do start actually caching
      // it, we reset it along with everything else.
      currentTime: 0,
      initTime: 0,
      inactivityTimeout: this.options_.inactivityTimeout,
      duration: NaN,
      lastVolume: 1,
      lastPlaybackRate: this.defaultPlaybackRate(),
      media: null,
      src: '',
      source: {},
      sources: [],
      playbackRates: [],
      volume: 1
    };
  }

  /**
   * Pass values to the playback tech
   *
   * @param {string} [method]
   *        the method to call
   *
   * @param {Object} arg
   *        the argument to pass
   *
   * @private
   */
  techCall_(method, arg) {
    // If it's not ready yet, call method when it is

    this.ready(function () {
      if (method in allowedSetters) {
        return set(this.middleware_, this.tech_, method, arg);
      } else if (method in allowedMediators) {
        return mediate(this.middleware_, this.tech_, method, arg);
      }
      try {
        if (this.tech_) {
          this.tech_[method](arg);
        }
      } catch (e) {
        log(e);
        throw e;
      }
    }, true);
  }

  /**
   * Mediate attempt to call playback tech method
   * and return the value of the method called.
   *
   * @param {string} method
   *        Tech method
   *
   * @return {*}
   *         Value returned by the tech method called, undefined if tech
   *         is not ready or tech method is not present
   *
   * @private
   */
  techGet_(method) {
    if (!this.tech_ || !this.tech_.isReady_) {
      return;
    }
    if (method in allowedGetters) {
      return get(this.middleware_, this.tech_, method);
    } else if (method in allowedMediators) {
      return mediate(this.middleware_, this.tech_, method);
    }

    // Log error when playback tech object is present but method
    // is undefined or unavailable
    try {
      return this.tech_[method]();
    } catch (e) {
      // When building additional tech libs, an expected method may not be defined yet
      if (this.tech_[method] === undefined) {
        log(`Video.js: ${method} method not defined for ${this.techName_} playback technology.`, e);
        throw e;
      }

      // When a method isn't available on the object it throws a TypeError
      if (e.name === 'TypeError') {
        log(`Video.js: ${method} unavailable on ${this.techName_} playback technology element.`, e);
        this.tech_.isReady_ = false;
        throw e;
      }

      // If error unknown, just log and throw
      log(e);
      throw e;
    }
  }

  /**
   * Attempt to begin playback at the first opportunity.
   *
   * @return {Promise|undefined}
   *         Returns a promise if the browser supports Promises (or one
   *         was passed in as an option). This promise will be resolved on
   *         the return value of play. If this is undefined it will fulfill the
   *         promise chain otherwise the promise chain will be fulfilled when
   *         the promise from play is fulfilled.
   */
  play() {
    return new Promise(resolve => {
      this.play_(resolve);
    });
  }

  /**
   * The actual logic for play, takes a callback that will be resolved on the
   * return value of play. This allows us to resolve to the play promise if there
   * is one on modern browsers.
   *
   * @private
   * @param {Function} [callback]
   *        The callback that should be called when the techs play is actually called
   */
  play_(callback = silencePromise) {
    this.playCallbacks_.push(callback);
    const isSrcReady = Boolean(!this.changingSrc_ && (this.src() || this.currentSrc()));
    const isSafariOrIOS = Boolean(IS_ANY_SAFARI || IS_IOS);

    // treat calls to play_ somewhat like the `one` event function
    if (this.waitToPlay_) {
      this.off(['ready', 'loadstart'], this.waitToPlay_);
      this.waitToPlay_ = null;
    }

    // if the player/tech is not ready or the src itself is not ready
    // queue up a call to play on `ready` or `loadstart`
    if (!this.isReady_ || !isSrcReady) {
      this.waitToPlay_ = e => {
        this.play_();
      };
      this.one(['ready', 'loadstart'], this.waitToPlay_);

      // if we are in Safari, there is a high chance that loadstart will trigger after the gesture timeperiod
      // in that case, we need to prime the video element by calling load so it'll be ready in time
      if (!isSrcReady && isSafariOrIOS) {
        this.load();
      }
      return;
    }

    // If the player/tech is ready and we have a source, we can attempt playback.
    const val = this.techGet_('play');

    // For native playback, reset the progress bar if we get a play call from a replay.
    const isNativeReplay = isSafariOrIOS && this.hasClass('vjs-ended');
    if (isNativeReplay) {
      this.resetProgressBar_();
    }
    // play was terminated if the returned value is null
    if (val === null) {
      this.runPlayTerminatedQueue_();
    } else {
      this.runPlayCallbacks_(val);
    }
  }

  /**
   * These functions will be run when if play is terminated. If play
   * runPlayCallbacks_ is run these function will not be run. This allows us
   * to differentiate between a terminated play and an actual call to play.
   */
  runPlayTerminatedQueue_() {
    const queue = this.playTerminatedQueue_.slice(0);
    this.playTerminatedQueue_ = [];
    queue.forEach(function (q) {
      q();
    });
  }

  /**
   * When a callback to play is delayed we have to run these
   * callbacks when play is actually called on the tech. This function
   * runs the callbacks that were delayed and accepts the return value
   * from the tech.
   *
   * @param {undefined|Promise} val
   *        The return value from the tech.
   */
  runPlayCallbacks_(val) {
    const callbacks = this.playCallbacks_.slice(0);
    this.playCallbacks_ = [];
    // clear play terminatedQueue since we finished a real play
    this.playTerminatedQueue_ = [];
    callbacks.forEach(function (cb) {
      cb(val);
    });
  }

  /**
   * Pause the video playback
   *
   * @return {Player}
   *         A reference to the player object this function was called on
   */
  pause() {
    this.techCall_('pause');
  }

  /**
   * Check if the player is paused or has yet to play
   *
   * @return {boolean}
   *         - false: if the media is currently playing
   *         - true: if media is not currently playing
   */
  paused() {
    // The initial state of paused should be true (in Safari it's actually false)
    return this.techGet_('paused') === false ? false : true;
  }

  /**
   * Get a TimeRange object representing the current ranges of time that the user
   * has played.
   *
   * @return { import('./utils/time').TimeRange }
   *         A time range object that represents all the increments of time that have
   *         been played.
   */
  played() {
    return this.techGet_('played') || createTimeRanges(0, 0);
  }

  /**
   * Returns whether or not the user is "scrubbing". Scrubbing is
   * when the user has clicked the progress bar handle and is
   * dragging it along the progress bar.
   *
   * @param {boolean} [isScrubbing]
   *        whether the user is or is not scrubbing
   *
   * @return {boolean}
   *         The value of scrubbing when getting
   */
  scrubbing(isScrubbing) {
    if (typeof isScrubbing === 'undefined') {
      return this.scrubbing_;
    }
    this.scrubbing_ = !!isScrubbing;
    this.techCall_('setScrubbing', this.scrubbing_);
    if (isScrubbing) {
      this.addClass('vjs-scrubbing');
    } else {
      this.removeClass('vjs-scrubbing');
    }
  }

  /**
   * Get or set the current time (in seconds)
   *
   * @param {number|string} [seconds]
   *        The time to seek to in seconds
   *
   * @return {number}
   *         - the current time in seconds when getting
   */
  currentTime(seconds) {
    if (typeof seconds !== 'undefined') {
      if (seconds < 0) {
        seconds = 0;
      }
      if (!this.isReady_ || this.changingSrc_ || !this.tech_ || !this.tech_.isReady_) {
        this.cache_.initTime = seconds;
        this.off('canplay', this.boundApplyInitTime_);
        this.one('canplay', this.boundApplyInitTime_);
        return;
      }
      this.techCall_('setCurrentTime', seconds);
      this.cache_.initTime = 0;
      return;
    }

    // cache last currentTime and return. default to 0 seconds
    //
    // Caching the currentTime is meant to prevent a massive amount of reads on the tech's
    // currentTime when scrubbing, but may not provide much performance benefit after all.
    // Should be tested. Also something has to read the actual current time or the cache will
    // never get updated.
    this.cache_.currentTime = this.techGet_('currentTime') || 0;
    return this.cache_.currentTime;
  }

  /**
   * Apply the value of initTime stored in cache as currentTime.
   *
   * @private
   */
  applyInitTime_() {
    this.currentTime(this.cache_.initTime);
  }

  /**
   * Normally gets the length in time of the video in seconds;
   * in all but the rarest use cases an argument will NOT be passed to the method
   *
   * > **NOTE**: The video must have started loading before the duration can be
   * known, and depending on preload behaviour may not be known until the video starts
   * playing.
   *
   * @fires Player#durationchange
   *
   * @param {number} [seconds]
   *        The duration of the video to set in seconds
   *
   * @return {number}
   *         - The duration of the video in seconds when getting
   */
  duration(seconds) {
    if (seconds === undefined) {
      // return NaN if the duration is not known
      return this.cache_.duration !== undefined ? this.cache_.duration : NaN;
    }
    seconds = parseFloat(seconds);

    // Standardize on Infinity for signaling video is live
    if (seconds < 0) {
      seconds = Infinity;
    }
    if (seconds !== this.cache_.duration) {
      // Cache the last set value for optimized scrubbing
      this.cache_.duration = seconds;
      if (seconds === Infinity) {
        this.addClass('vjs-live');
      } else {
        this.removeClass('vjs-live');
      }
      if (!isNaN(seconds)) {
        // Do not fire durationchange unless the duration value is known.
        // @see [Spec]{@link https://www.w3.org/TR/2011/WD-html5-20110113/video.html#media-element-load-algorithm}

        /**
         * @event Player#durationchange
         * @type {Event}
         */
        this.trigger('durationchange');
      }
    }
  }

  /**
   * Calculates how much time is left in the video. Not part
   * of the native video API.
   *
   * @return {number}
   *         The time remaining in seconds
   */
  remainingTime() {
    return this.duration() - this.currentTime();
  }

  /**
   * A remaining time function that is intended to be used when
   * the time is to be displayed directly to the user.
   *
   * @return {number}
   *         The rounded time remaining in seconds
   */
  remainingTimeDisplay() {
    return Math.floor(this.duration()) - Math.floor(this.currentTime());
  }

  //
  // Kind of like an array of portions of the video that have been downloaded.

  /**
   * Get a TimeRange object with an array of the times of the video
   * that have been downloaded. If you just want the percent of the
   * video that's been downloaded, use bufferedPercent.
   *
   * @see [Buffered Spec]{@link http://dev.w3.org/html5/spec/video.html#dom-media-buffered}
   *
   * @return { import('./utils/time').TimeRange }
   *         A mock {@link TimeRanges} object (following HTML spec)
   */
  buffered() {
    let buffered = this.techGet_('buffered');
    if (!buffered || !buffered.length) {
      buffered = createTimeRanges(0, 0);
    }
    return buffered;
  }

  /**
   * Get the percent (as a decimal) of the video that's been downloaded.
   * This method is not a part of the native HTML video API.
   *
   * @return {number}
   *         A decimal between 0 and 1 representing the percent
   *         that is buffered 0 being 0% and 1 being 100%
   */
  bufferedPercent() {
    return bufferedPercent(this.buffered(), this.duration());
  }

  /**
   * Get the ending time of the last buffered time range
   * This is used in the progress bar to encapsulate all time ranges.
   *
   * @return {number}
   *         The end of the last buffered time range
   */
  bufferedEnd() {
    const buffered = this.buffered();
    const duration = this.duration();
    let end = buffered.end(buffered.length - 1);
    if (end > duration) {
      end = duration;
    }
    return end;
  }

  /**
   * Get or set the current volume of the media
   *
   * @param  {number} [percentAsDecimal]
   *         The new volume as a decimal percent:
   *         - 0 is muted/0%/off
   *         - 1.0 is 100%/full
   *         - 0.5 is half volume or 50%
   *
   * @return {number}
   *         The current volume as a percent when getting
   */
  volume(percentAsDecimal) {
    let vol;
    if (percentAsDecimal !== undefined) {
      // Force value to between 0 and 1
      vol = Math.max(0, Math.min(1, parseFloat(percentAsDecimal)));
      this.cache_.volume = vol;
      this.techCall_('setVolume', vol);
      if (vol > 0) {
        this.lastVolume_(vol);
      }
      return;
    }

    // Default to 1 when returning current volume.
    vol = parseFloat(this.techGet_('volume'));
    return isNaN(vol) ? 1 : vol;
  }

  /**
   * Get the current muted state, or turn mute on or off
   *
   * @param {boolean} [muted]
   *        - true to mute
   *        - false to unmute
   *
   * @return {boolean}
   *         - true if mute is on and getting
   *         - false if mute is off and getting
   */
  muted(muted) {
    if (muted !== undefined) {
      this.techCall_('setMuted', muted);
      return;
    }
    return this.techGet_('muted') || false;
  }

  /**
   * Get the current defaultMuted state, or turn defaultMuted on or off. defaultMuted
   * indicates the state of muted on initial playback.
   *
   * ```js
   *   var myPlayer = videojs('some-player-id');
   *
   *   myPlayer.src("http://www.example.com/path/to/video.mp4");
   *
   *   // get, should be false
   *   console.log(myPlayer.defaultMuted());
   *   // set to true
   *   myPlayer.defaultMuted(true);
   *   // get should be true
   *   console.log(myPlayer.defaultMuted());
   * ```
   *
   * @param {boolean} [defaultMuted]
   *        - true to mute
   *        - false to unmute
   *
   * @return {boolean|Player}
   *         - true if defaultMuted is on and getting
   *         - false if defaultMuted is off and getting
   *         - A reference to the current player when setting
   */
  defaultMuted(defaultMuted) {
    if (defaultMuted !== undefined) {
      return this.techCall_('setDefaultMuted', defaultMuted);
    }
    return this.techGet_('defaultMuted') || false;
  }

  /**
   * Get the last volume, or set it
   *
   * @param  {number} [percentAsDecimal]
   *         The new last volume as a decimal percent:
   *         - 0 is muted/0%/off
   *         - 1.0 is 100%/full
   *         - 0.5 is half volume or 50%
   *
   * @return {number}
   *         the current value of lastVolume as a percent when getting
   *
   * @private
   */
  lastVolume_(percentAsDecimal) {
    if (percentAsDecimal !== undefined && percentAsDecimal !== 0) {
      this.cache_.lastVolume = percentAsDecimal;
      return;
    }
    return this.cache_.lastVolume;
  }

  /**
   * Check if current tech can support native fullscreen
   * (e.g. with built in controls like iOS)
   *
   * @return {boolean}
   *         if native fullscreen is supported
   */
  supportsFullScreen() {
    return this.techGet_('supportsFullScreen') || false;
  }

  /**
   * Check if the player is in fullscreen mode or tell the player that it
   * is or is not in fullscreen mode.
   *
   * > NOTE: As of the latest HTML5 spec, isFullscreen is no longer an official
   * property and instead document.fullscreenElement is used. But isFullscreen is
   * still a valuable property for internal player workings.
   *
   * @param  {boolean} [isFS]
   *         Set the players current fullscreen state
   *
   * @return {boolean}
   *         - true if fullscreen is on and getting
   *         - false if fullscreen is off and getting
   */
  isFullscreen(isFS) {
    if (isFS !== undefined) {
      const oldValue = this.isFullscreen_;
      this.isFullscreen_ = Boolean(isFS);

      // if we changed fullscreen state and we're in prefixed mode, trigger fullscreenchange
      // this is the only place where we trigger fullscreenchange events for older browsers
      // fullWindow mode is treated as a prefixed event and will get a fullscreenchange event as well
      if (this.isFullscreen_ !== oldValue && this.fsApi_.prefixed) {
        /**
           * @event Player#fullscreenchange
           * @type {Event}
           */
        this.trigger('fullscreenchange');
      }
      this.toggleFullscreenClass_();
      return;
    }
    return this.isFullscreen_;
  }

  /**
   * Increase the size of the video to full screen
   * In some browsers, full screen is not supported natively, so it enters
   * "full window mode", where the video fills the browser window.
   * In browsers and devices that support native full screen, sometimes the
   * browser's default controls will be shown, and not the Video.js custom skin.
   * This includes most mobile devices (iOS, Android) and older versions of
   * Safari.
   *
   * @param  {Object} [fullscreenOptions]
   *         Override the player fullscreen options
   *
   * @fires Player#fullscreenchange
   */
  requestFullscreen(fullscreenOptions) {
    if (this.isInPictureInPicture()) {
      this.exitPictureInPicture();
    }
    const self = this;
    return new Promise((resolve, reject) => {
      function offHandler() {
        self.off('fullscreenerror', errorHandler);
        self.off('fullscreenchange', changeHandler);
      }
      function changeHandler() {
        offHandler();
        resolve();
      }
      function errorHandler(e, err) {
        offHandler();
        reject(err);
      }
      self.one('fullscreenchange', changeHandler);
      self.one('fullscreenerror', errorHandler);
      const promise = self.requestFullscreenHelper_(fullscreenOptions);
      if (promise) {
        promise.then(offHandler, offHandler);
        promise.then(resolve, reject);
      }
    });
  }
  requestFullscreenHelper_(fullscreenOptions) {
    let fsOptions;

    // Only pass fullscreen options to requestFullscreen in spec-compliant browsers.
    // Use defaults or player configured option unless passed directly to this method.
    if (!this.fsApi_.prefixed) {
      fsOptions = this.options_.fullscreen && this.options_.fullscreen.options || {};
      if (fullscreenOptions !== undefined) {
        fsOptions = fullscreenOptions;
      }
    }

    // This method works as follows:
    // 1. if a fullscreen api is available, use it
    //   1. call requestFullscreen with potential options
    //   2. if we got a promise from above, use it to update isFullscreen()
    // 2. otherwise, if the tech supports fullscreen, call `enterFullScreen` on it.
    //   This is particularly used for iPhone, older iPads, and non-safari browser on iOS.
    // 3. otherwise, use "fullWindow" mode
    if (this.fsApi_.requestFullscreen) {
      const promise = this.el_[this.fsApi_.requestFullscreen](fsOptions);

      // Even on browsers with promise support this may not return a promise
      if (promise) {
        promise.then(() => this.isFullscreen(true), () => this.isFullscreen(false));
      }
      return promise;
    } else if (this.tech_.supportsFullScreen() && !this.options_.preferFullWindow === true) {
      // we can't take the video.js controls fullscreen but we can go fullscreen
      // with native controls
      this.techCall_('enterFullScreen');
    } else {
      // fullscreen isn't supported so we'll just stretch the video element to
      // fill the viewport
      this.enterFullWindow();
    }
  }

  /**
   * Return the video to its normal size after having been in full screen mode
   *
   * @fires Player#fullscreenchange
   */
  exitFullscreen() {
    const self = this;
    return new Promise((resolve, reject) => {
      function offHandler() {
        self.off('fullscreenerror', errorHandler);
        self.off('fullscreenchange', changeHandler);
      }
      function changeHandler() {
        offHandler();
        resolve();
      }
      function errorHandler(e, err) {
        offHandler();
        reject(err);
      }
      self.one('fullscreenchange', changeHandler);
      self.one('fullscreenerror', errorHandler);
      const promise = self.exitFullscreenHelper_();
      if (promise) {
        promise.then(offHandler, offHandler);
        // map the promise to our resolve/reject methods
        promise.then(resolve, reject);
      }
    });
  }
  exitFullscreenHelper_() {
    if (this.fsApi_.requestFullscreen) {
      const promise = document[this.fsApi_.exitFullscreen]();

      // Even on browsers with promise support this may not return a promise
      if (promise) {
        // we're splitting the promise here, so, we want to catch the
        // potential error so that this chain doesn't have unhandled errors
        silencePromise(promise.then(() => this.isFullscreen(false)));
      }
      return promise;
    } else if (this.tech_.supportsFullScreen() && !this.options_.preferFullWindow === true) {
      this.techCall_('exitFullScreen');
    } else {
      this.exitFullWindow();
    }
  }

  /**
   * When fullscreen isn't supported we can stretch the
   * video container to as wide as the browser will let us.
   *
   * @fires Player#enterFullWindow
   */
  enterFullWindow() {
    this.isFullscreen(true);
    this.isFullWindow = true;

    // Storing original doc overflow value to return to when fullscreen is off
    this.docOrigOverflow = document.documentElement.style.overflow;

    // Add listener for esc key to exit fullscreen
    on(document, 'keydown', this.boundFullWindowOnEscKey_);

    // Hide any scroll bars
    document.documentElement.style.overflow = 'hidden';

    // Apply fullscreen styles
    addClass(document.body, 'vjs-full-window');

    /**
     * @event Player#enterFullWindow
     * @type {Event}
     */
    this.trigger('enterFullWindow');
  }

  /**
   * Check for call to either exit full window or
   * full screen on ESC key
   *
   * @param {string} event
   *        Event to check for key press
   */
  fullWindowOnEscKey(event) {
    if (keycode.isEventKey(event, 'Esc')) {
      if (this.isFullscreen() === true) {
        if (!this.isFullWindow) {
          this.exitFullscreen();
        } else {
          this.exitFullWindow();
        }
      }
    }
  }

  /**
   * Exit full window
   *
   * @fires Player#exitFullWindow
   */
  exitFullWindow() {
    this.isFullscreen(false);
    this.isFullWindow = false;
    off(document, 'keydown', this.boundFullWindowOnEscKey_);

    // Unhide scroll bars.
    document.documentElement.style.overflow = this.docOrigOverflow;

    // Remove fullscreen styles
    removeClass(document.body, 'vjs-full-window');

    // Resize the box, controller, and poster to original sizes
    // this.positionAll();
    /**
     * @event Player#exitFullWindow
     * @type {Event}
     */
    this.trigger('exitFullWindow');
  }

  /**
   * Disable Picture-in-Picture mode.
   *
   * @param {boolean} value
   *                  - true will disable Picture-in-Picture mode
   *                  - false will enable Picture-in-Picture mode
   */
  disablePictureInPicture(value) {
    if (value === undefined) {
      return this.techGet_('disablePictureInPicture');
    }
    this.techCall_('setDisablePictureInPicture', value);
    this.options_.disablePictureInPicture = value;
    this.trigger('disablepictureinpicturechanged');
  }

  /**
   * Check if the player is in Picture-in-Picture mode or tell the player that it
   * is or is not in Picture-in-Picture mode.
   *
   * @param  {boolean} [isPiP]
   *         Set the players current Picture-in-Picture state
   *
   * @return {boolean}
   *         - true if Picture-in-Picture is on and getting
   *         - false if Picture-in-Picture is off and getting
   */
  isInPictureInPicture(isPiP) {
    if (isPiP !== undefined) {
      this.isInPictureInPicture_ = !!isPiP;
      this.togglePictureInPictureClass_();
      return;
    }
    return !!this.isInPictureInPicture_;
  }

  /**
   * Create a floating video window always on top of other windows so that users may
   * continue consuming media while they interact with other content sites, or
   * applications on their device.
   *
   * This can use document picture-in-picture or element picture in picture
   *
   * Set `enableDocumentPictureInPicture` to `true` to use docPiP on a supported browser
   * Else set `disablePictureInPicture` to `false` to disable elPiP on a supported browser
   *
   *
   * @see [Spec]{@link https://w3c.github.io/picture-in-picture/}
   * @see [Spec]{@link https://wicg.github.io/document-picture-in-picture/}
   *
   * @fires Player#enterpictureinpicture
   *
   * @return {Promise}
   *         A promise with a Picture-in-Picture window.
   */
  requestPictureInPicture() {
    if (this.options_.enableDocumentPictureInPicture && window.documentPictureInPicture) {
      const pipContainer = document.createElement(this.el().tagName);
      pipContainer.classList = this.el().classList;
      pipContainer.classList.add('vjs-pip-container');
      if (this.posterImage) {
        pipContainer.appendChild(this.posterImage.el().cloneNode(true));
      }
      if (this.titleBar) {
        pipContainer.appendChild(this.titleBar.el().cloneNode(true));
      }
      pipContainer.appendChild(createEl('p', {
        className: 'vjs-pip-text'
      }, {}, this.localize('Playing in picture-in-picture')));
      return window.documentPictureInPicture.requestWindow({
        // The aspect ratio won't be correct, Chrome bug https://crbug.com/1407629
        initialAspectRatio: this.videoWidth() / this.videoHeight(),
        copyStyleSheets: true
      }).then(pipWindow => {
        this.el_.parentNode.insertBefore(pipContainer, this.el_);
        pipWindow.document.body.append(this.el_);
        pipWindow.document.body.classList.add('vjs-pip-window');
        this.player_.isInPictureInPicture(true);
        this.player_.trigger('enterpictureinpicture');

        // Listen for the PiP closing event to move the video back.
        pipWindow.addEventListener('unload', event => {
          const pipVideo = event.target.querySelector('.video-js');
          pipContainer.replaceWith(pipVideo);
          this.player_.isInPictureInPicture(false);
          this.player_.trigger('leavepictureinpicture');
        });
        return pipWindow;
      });
    }
    if ('pictureInPictureEnabled' in document && this.disablePictureInPicture() === false) {
      /**
       * This event fires when the player enters picture in picture mode
       *
       * @event Player#enterpictureinpicture
       * @type {Event}
       */
      return this.techGet_('requestPictureInPicture');
    }
    return Promise.reject('No PiP mode is available');
  }

  /**
   * Exit Picture-in-Picture mode.
   *
   * @see [Spec]{@link https://wicg.github.io/picture-in-picture}
   *
   * @fires Player#leavepictureinpicture
   *
   * @return {Promise}
   *         A promise.
   */
  exitPictureInPicture() {
    if (window.documentPictureInPicture && window.documentPictureInPicture.window) {
      // With documentPictureInPicture, Player#leavepictureinpicture is fired in the unload handler
      window.documentPictureInPicture.window.close();
      return Promise.resolve();
    }
    if ('pictureInPictureEnabled' in document) {
      /**
       * This event fires when the player leaves picture in picture mode
       *
       * @event Player#leavepictureinpicture
       * @type {Event}
       */
      return document.exitPictureInPicture();
    }
  }

  /**
   * Called when this Player has focus and a key gets pressed down, or when
   * any Component of this player receives a key press that it doesn't handle.
   * This allows player-wide hotkeys (either as defined below, or optionally
   * by an external function).
   *
   * @param {Event} event
   *        The `keydown` event that caused this function to be called.
   *
   * @listens keydown
   */
  handleKeyDown(event) {
    const {
      userActions
    } = this.options_;

    // Bail out if hotkeys are not configured.
    if (!userActions || !userActions.hotkeys) {
      return;
    }

    // Function that determines whether or not to exclude an element from
    // hotkeys handling.
    const excludeElement = el => {
      const tagName = el.tagName.toLowerCase();

      // The first and easiest test is for `contenteditable` elements.
      if (el.isContentEditable) {
        return true;
      }

      // Inputs matching these types will still trigger hotkey handling as
      // they are not text inputs.
      const allowedInputTypes = ['button', 'checkbox', 'hidden', 'radio', 'reset', 'submit'];
      if (tagName === 'input') {
        return allowedInputTypes.indexOf(el.type) === -1;
      }

      // The final test is by tag name. These tags will be excluded entirely.
      const excludedTags = ['textarea'];
      return excludedTags.indexOf(tagName) !== -1;
    };

    // Bail out if the user is focused on an interactive form element.
    if (excludeElement(this.el_.ownerDocument.activeElement)) {
      return;
    }
    if (typeof userActions.hotkeys === 'function') {
      userActions.hotkeys.call(this, event);
    } else {
      this.handleHotkeys(event);
    }
  }

  /**
   * Called when this Player receives a hotkey keydown event.
   * Supported player-wide hotkeys are:
   *
   *   f          - toggle fullscreen
   *   m          - toggle mute
   *   k or Space - toggle play/pause
   *
   * @param {Event} event
   *        The `keydown` event that caused this function to be called.
   */
  handleHotkeys(event) {
    const hotkeys = this.options_.userActions ? this.options_.userActions.hotkeys : {};

    // set fullscreenKey, muteKey, playPauseKey from `hotkeys`, use defaults if not set
    const {
      fullscreenKey = keydownEvent => keycode.isEventKey(keydownEvent, 'f'),
      muteKey = keydownEvent => keycode.isEventKey(keydownEvent, 'm'),
      playPauseKey = keydownEvent => keycode.isEventKey(keydownEvent, 'k') || keycode.isEventKey(keydownEvent, 'Space')
    } = hotkeys;
    if (fullscreenKey.call(this, event)) {
      event.preventDefault();
      event.stopPropagation();
      const FSToggle = Component.getComponent('FullscreenToggle');
      if (document[this.fsApi_.fullscreenEnabled] !== false) {
        FSToggle.prototype.handleClick.call(this, event);
      }
    } else if (muteKey.call(this, event)) {
      event.preventDefault();
      event.stopPropagation();
      const MuteToggle = Component.getComponent('MuteToggle');
      MuteToggle.prototype.handleClick.call(this, event);
    } else if (playPauseKey.call(this, event)) {
      event.preventDefault();
      event.stopPropagation();
      const PlayToggle = Component.getComponent('PlayToggle');
      PlayToggle.prototype.handleClick.call(this, event);
    }
  }

  /**
   * Check whether the player can play a given mimetype
   *
   * @see https://www.w3.org/TR/2011/WD-html5-20110113/video.html#dom-navigator-canplaytype
   *
   * @param {string} type
   *        The mimetype to check
   *
   * @return {string}
   *         'probably', 'maybe', or '' (empty string)
   */
  canPlayType(type) {
    let can;

    // Loop through each playback technology in the options order
    for (let i = 0, j = this.options_.techOrder; i < j.length; i++) {
      const techName = j[i];
      let tech = Tech.getTech(techName);

      // Support old behavior of techs being registered as components.
      // Remove once that deprecated behavior is removed.
      if (!tech) {
        tech = Component.getComponent(techName);
      }

      // Check if the current tech is defined before continuing
      if (!tech) {
        log.error(`The "${techName}" tech is undefined. Skipped browser support check for that tech.`);
        continue;
      }

      // Check if the browser supports this technology
      if (tech.isSupported()) {
        can = tech.canPlayType(type);
        if (can) {
          return can;
        }
      }
    }
    return '';
  }

  /**
   * Select source based on tech-order or source-order
   * Uses source-order selection if `options.sourceOrder` is truthy. Otherwise,
   * defaults to tech-order selection
   *
   * @param {Array} sources
   *        The sources for a media asset
   *
   * @return {Object|boolean}
   *         Object of source and tech order or false
   */
  selectSource(sources) {
    // Get only the techs specified in `techOrder` that exist and are supported by the
    // current platform
    const techs = this.options_.techOrder.map(techName => {
      return [techName, Tech.getTech(techName)];
    }).filter(([techName, tech]) => {
      // Check if the current tech is defined before continuing
      if (tech) {
        // Check if the browser supports this technology
        return tech.isSupported();
      }
      log.error(`The "${techName}" tech is undefined. Skipped browser support check for that tech.`);
      return false;
    });

    // Iterate over each `innerArray` element once per `outerArray` element and execute
    // `tester` with both. If `tester` returns a non-falsy value, exit early and return
    // that value.
    const findFirstPassingTechSourcePair = function (outerArray, innerArray, tester) {
      let found;
      outerArray.some(outerChoice => {
        return innerArray.some(innerChoice => {
          found = tester(outerChoice, innerChoice);
          if (found) {
            return true;
          }
        });
      });
      return found;
    };
    let foundSourceAndTech;
    const flip = fn => (a, b) => fn(b, a);
    const finder = ([techName, tech], source) => {
      if (tech.canPlaySource(source, this.options_[techName.toLowerCase()])) {
        return {
          source,
          tech: techName
        };
      }
    };

    // Depending on the truthiness of `options.sourceOrder`, we swap the order of techs and sources
    // to select from them based on their priority.
    if (this.options_.sourceOrder) {
      // Source-first ordering
      foundSourceAndTech = findFirstPassingTechSourcePair(sources, techs, flip(finder));
    } else {
      // Tech-first ordering
      foundSourceAndTech = findFirstPassingTechSourcePair(techs, sources, finder);
    }
    return foundSourceAndTech || false;
  }

  /**
   * Executes source setting and getting logic
   *
   * @param {Tech~SourceObject|Tech~SourceObject[]|string} [source]
   *        A SourceObject, an array of SourceObjects, or a string referencing
   *        a URL to a media source. It is _highly recommended_ that an object
   *        or array of objects is used here, so that source selection
   *        algorithms can take the `type` into account.
   *
   *        If not provided, this method acts as a getter.
   * @param {boolean} isRetry
   *        Indicates whether this is being called internally as a result of a retry
   *
   * @return {string|undefined}
   *         If the `source` argument is missing, returns the current source
   *         URL. Otherwise, returns nothing/undefined.
   */
  handleSrc_(source, isRetry) {
    // getter usage
    if (typeof source === 'undefined') {
      return this.cache_.src || '';
    }

    // Reset retry behavior for new source
    if (this.resetRetryOnError_) {
      this.resetRetryOnError_();
    }

    // filter out invalid sources and turn our source into
    // an array of source objects
    const sources = filterSource(source);

    // if a source was passed in then it is invalid because
    // it was filtered to a zero length Array. So we have to
    // show an error
    if (!sources.length) {
      this.setTimeout(function () {
        this.error({
          code: 4,
          message: this.options_.notSupportedMessage
        });
      }, 0);
      return;
    }

    // initial sources
    this.changingSrc_ = true;

    // Only update the cached source list if we are not retrying a new source after error,
    // since in that case we want to include the failed source(s) in the cache
    if (!isRetry) {
      this.cache_.sources = sources;
    }
    this.updateSourceCaches_(sources[0]);

    // middlewareSource is the source after it has been changed by middleware
    setSource(this, sources[0], (middlewareSource, mws) => {
      this.middleware_ = mws;

      // since sourceSet is async we have to update the cache again after we select a source since
      // the source that is selected could be out of order from the cache update above this callback.
      if (!isRetry) {
        this.cache_.sources = sources;
      }
      this.updateSourceCaches_(middlewareSource);
      const err = this.src_(middlewareSource);
      if (err) {
        if (sources.length > 1) {
          return this.handleSrc_(sources.slice(1));
        }
        this.changingSrc_ = false;

        // We need to wrap this in a timeout to give folks a chance to add error event handlers
        this.setTimeout(function () {
          this.error({
            code: 4,
            message: this.options_.notSupportedMessage
          });
        }, 0);

        // we could not find an appropriate tech, but let's still notify the delegate that this is it
        // this needs a better comment about why this is needed
        this.triggerReady();
        return;
      }
      setTech(mws, this.tech_);
    });

    // Try another available source if this one fails before playback.
    if (sources.length > 1) {
      const retry = () => {
        // Remove the error modal
        this.error(null);
        this.handleSrc_(sources.slice(1), true);
      };
      const stopListeningForErrors = () => {
        this.off('error', retry);
      };
      this.one('error', retry);
      this.one('playing', stopListeningForErrors);
      this.resetRetryOnError_ = () => {
        this.off('error', retry);
        this.off('playing', stopListeningForErrors);
      };
    }
  }

  /**
   * Get or set the video source.
   *
   * @param {Tech~SourceObject|Tech~SourceObject[]|string} [source]
   *        A SourceObject, an array of SourceObjects, or a string referencing
   *        a URL to a media source. It is _highly recommended_ that an object
   *        or array of objects is used here, so that source selection
   *        algorithms can take the `type` into account.
   *
   *        If not provided, this method acts as a getter.
   *
   * @return {string|undefined}
   *         If the `source` argument is missing, returns the current source
   *         URL. Otherwise, returns nothing/undefined.
   */
  src(source) {
    return this.handleSrc_(source, false);
  }

  /**
   * Set the source object on the tech, returns a boolean that indicates whether
   * there is a tech that can play the source or not
   *
   * @param {Tech~SourceObject} source
   *        The source object to set on the Tech
   *
   * @return {boolean}
   *         - True if there is no Tech to playback this source
   *         - False otherwise
   *
   * @private
   */
  src_(source) {
    const sourceTech = this.selectSource([source]);
    if (!sourceTech) {
      return true;
    }
    if (!titleCaseEquals(sourceTech.tech, this.techName_)) {
      this.changingSrc_ = true;
      // load this technology with the chosen source
      this.loadTech_(sourceTech.tech, sourceTech.source);
      this.tech_.ready(() => {
        this.changingSrc_ = false;
      });
      return false;
    }

    // wait until the tech is ready to set the source
    // and set it synchronously if possible (#2326)
    this.ready(function () {
      // The setSource tech method was added with source handlers
      // so older techs won't support it
      // We need to check the direct prototype for the case where subclasses
      // of the tech do not support source handlers
      if (this.tech_.constructor.prototype.hasOwnProperty('setSource')) {
        this.techCall_('setSource', source);
      } else {
        this.techCall_('src', source.src);
      }
      this.changingSrc_ = false;
    }, true);
    return false;
  }

  /**
   * Begin loading the src data.
   */
  load() {
    this.techCall_('load');
  }

  /**
   * Reset the player. Loads the first tech in the techOrder,
   * removes all the text tracks in the existing `tech`,
   * and calls `reset` on the `tech`.
   */
  reset() {
    if (this.paused()) {
      this.doReset_();
    } else {
      const playPromise = this.play();
      silencePromise(playPromise.then(() => this.doReset_()));
    }
  }
  doReset_() {
    if (this.tech_) {
      this.tech_.clearTracks('text');
    }
    this.resetCache_();
    this.poster('');
    this.loadTech_(this.options_.techOrder[0], null);
    this.techCall_('reset');
    this.resetControlBarUI_();
    if (isEvented(this)) {
      this.trigger('playerreset');
    }
  }

  /**
   * Reset Control Bar's UI by calling sub-methods that reset
   * all of Control Bar's components
   */
  resetControlBarUI_() {
    this.resetProgressBar_();
    this.resetPlaybackRate_();
    this.resetVolumeBar_();
  }

  /**
   * Reset tech's progress so progress bar is reset in the UI
   */
  resetProgressBar_() {
    this.currentTime(0);
    const {
      currentTimeDisplay,
      durationDisplay,
      progressControl,
      remainingTimeDisplay
    } = this.controlBar || {};
    const {
      seekBar
    } = progressControl || {};
    if (currentTimeDisplay) {
      currentTimeDisplay.updateContent();
    }
    if (durationDisplay) {
      durationDisplay.updateContent();
    }
    if (remainingTimeDisplay) {
      remainingTimeDisplay.updateContent();
    }
    if (seekBar) {
      seekBar.update();
      if (seekBar.loadProgressBar) {
        seekBar.loadProgressBar.update();
      }
    }
  }

  /**
   * Reset Playback ratio
   */
  resetPlaybackRate_() {
    this.playbackRate(this.defaultPlaybackRate());
    this.handleTechRateChange_();
  }

  /**
   * Reset Volume bar
   */
  resetVolumeBar_() {
    this.volume(1.0);
    this.trigger('volumechange');
  }

  /**
   * Returns all of the current source objects.
   *
   * @return {Tech~SourceObject[]}
   *         The current source objects
   */
  currentSources() {
    const source = this.currentSource();
    const sources = [];

    // assume `{}` or `{ src }`
    if (Object.keys(source).length !== 0) {
      sources.push(source);
    }
    return this.cache_.sources || sources;
  }

  /**
   * Returns the current source object.
   *
   * @return {Tech~SourceObject}
   *         The current source object
   */
  currentSource() {
    return this.cache_.source || {};
  }

  /**
   * Returns the fully qualified URL of the current source value e.g. http://mysite.com/video.mp4
   * Can be used in conjunction with `currentType` to assist in rebuilding the current source object.
   *
   * @return {string}
   *         The current source
   */
  currentSrc() {
    return this.currentSource() && this.currentSource().src || '';
  }

  /**
   * Get the current source type e.g. video/mp4
   * This can allow you rebuild the current source object so that you could load the same
   * source and tech later
   *
   * @return {string}
   *         The source MIME type
   */
  currentType() {
    return this.currentSource() && this.currentSource().type || '';
  }

  /**
   * Get or set the preload attribute
   *
   * @param {boolean} [value]
   *        - true means that we should preload
   *        - false means that we should not preload
   *
   * @return {string}
   *         The preload attribute value when getting
   */
  preload(value) {
    if (value !== undefined) {
      this.techCall_('setPreload', value);
      this.options_.preload = value;
      return;
    }
    return this.techGet_('preload');
  }

  /**
   * Get or set the autoplay option. When this is a boolean it will
   * modify the attribute on the tech. When this is a string the attribute on
   * the tech will be removed and `Player` will handle autoplay on loadstarts.
   *
   * @param {boolean|string} [value]
   *        - true: autoplay using the browser behavior
   *        - false: do not autoplay
   *        - 'play': call play() on every loadstart
   *        - 'muted': call muted() then play() on every loadstart
   *        - 'any': call play() on every loadstart. if that fails call muted() then play().
   *        - *: values other than those listed here will be set `autoplay` to true
   *
   * @return {boolean|string}
   *         The current value of autoplay when getting
   */
  autoplay(value) {
    // getter usage
    if (value === undefined) {
      return this.options_.autoplay || false;
    }
    let techAutoplay;

    // if the value is a valid string set it to that, or normalize `true` to 'play', if need be
    if (typeof value === 'string' && /(any|play|muted)/.test(value) || value === true && this.options_.normalizeAutoplay) {
      this.options_.autoplay = value;
      this.manualAutoplay_(typeof value === 'string' ? value : 'play');
      techAutoplay = false;

      // any falsy value sets autoplay to false in the browser,
      // lets do the same
    } else if (!value) {
      this.options_.autoplay = false;

      // any other value (ie truthy) sets autoplay to true
    } else {
      this.options_.autoplay = true;
    }
    techAutoplay = typeof techAutoplay === 'undefined' ? this.options_.autoplay : techAutoplay;

    // if we don't have a tech then we do not queue up
    // a setAutoplay call on tech ready. We do this because the
    // autoplay option will be passed in the constructor and we
    // do not need to set it twice
    if (this.tech_) {
      this.techCall_('setAutoplay', techAutoplay);
    }
  }

  /**
   * Set or unset the playsinline attribute.
   * Playsinline tells the browser that non-fullscreen playback is preferred.
   *
   * @param {boolean} [value]
   *        - true means that we should try to play inline by default
   *        - false means that we should use the browser's default playback mode,
   *          which in most cases is inline. iOS Safari is a notable exception
   *          and plays fullscreen by default.
   *
   * @return {string|Player}
   *         - the current value of playsinline
   *         - the player when setting
   *
   * @see [Spec]{@link https://html.spec.whatwg.org/#attr-video-playsinline}
   */
  playsinline(value) {
    if (value !== undefined) {
      this.techCall_('setPlaysinline', value);
      this.options_.playsinline = value;
      return this;
    }
    return this.techGet_('playsinline');
  }

  /**
   * Get or set the loop attribute on the video element.
   *
   * @param {boolean} [value]
   *        - true means that we should loop the video
   *        - false means that we should not loop the video
   *
   * @return {boolean}
   *         The current value of loop when getting
   */
  loop(value) {
    if (value !== undefined) {
      this.techCall_('setLoop', value);
      this.options_.loop = value;
      return;
    }
    return this.techGet_('loop');
  }

  /**
   * Get or set the poster image source url
   *
   * @fires Player#posterchange
   *
   * @param {string} [src]
   *        Poster image source URL
   *
   * @return {string}
   *         The current value of poster when getting
   */
  poster(src) {
    if (src === undefined) {
      return this.poster_;
    }

    // The correct way to remove a poster is to set as an empty string
    // other falsey values will throw errors
    if (!src) {
      src = '';
    }
    if (src === this.poster_) {
      return;
    }

    // update the internal poster variable
    this.poster_ = src;

    // update the tech's poster
    this.techCall_('setPoster', src);
    this.isPosterFromTech_ = false;

    // alert components that the poster has been set
    /**
     * This event fires when the poster image is changed on the player.
     *
     * @event Player#posterchange
     * @type {Event}
     */
    this.trigger('posterchange');
  }

  /**
   * Some techs (e.g. YouTube) can provide a poster source in an
   * asynchronous way. We want the poster component to use this
   * poster source so that it covers up the tech's controls.
   * (YouTube's play button). However we only want to use this
   * source if the player user hasn't set a poster through
   * the normal APIs.
   *
   * @fires Player#posterchange
   * @listens Tech#posterchange
   * @private
   */
  handleTechPosterChange_() {
    if ((!this.poster_ || this.options_.techCanOverridePoster) && this.tech_ && this.tech_.poster) {
      const newPoster = this.tech_.poster() || '';
      if (newPoster !== this.poster_) {
        this.poster_ = newPoster;
        this.isPosterFromTech_ = true;

        // Let components know the poster has changed
        this.trigger('posterchange');
      }
    }
  }

  /**
   * Get or set whether or not the controls are showing.
   *
   * @fires Player#controlsenabled
   *
   * @param {boolean} [bool]
   *        - true to turn controls on
   *        - false to turn controls off
   *
   * @return {boolean}
   *         The current value of controls when getting
   */
  controls(bool) {
    if (bool === undefined) {
      return !!this.controls_;
    }
    bool = !!bool;

    // Don't trigger a change event unless it actually changed
    if (this.controls_ === bool) {
      return;
    }
    this.controls_ = bool;
    if (this.usingNativeControls()) {
      this.techCall_('setControls', bool);
    }
    if (this.controls_) {
      this.removeClass('vjs-controls-disabled');
      this.addClass('vjs-controls-enabled');
      /**
       * @event Player#controlsenabled
       * @type {Event}
       */
      this.trigger('controlsenabled');
      if (!this.usingNativeControls()) {
        this.addTechControlsListeners_();
      }
    } else {
      this.removeClass('vjs-controls-enabled');
      this.addClass('vjs-controls-disabled');
      /**
       * @event Player#controlsdisabled
       * @type {Event}
       */
      this.trigger('controlsdisabled');
      if (!this.usingNativeControls()) {
        this.removeTechControlsListeners_();
      }
    }
  }

  /**
   * Toggle native controls on/off. Native controls are the controls built into
   * devices (e.g. default iPhone controls) or other techs
   * (e.g. Vimeo Controls)
   * **This should only be set by the current tech, because only the tech knows
   * if it can support native controls**
   *
   * @fires Player#usingnativecontrols
   * @fires Player#usingcustomcontrols
   *
   * @param {boolean} [bool]
   *        - true to turn native controls on
   *        - false to turn native controls off
   *
   * @return {boolean}
   *         The current value of native controls when getting
   */
  usingNativeControls(bool) {
    if (bool === undefined) {
      return !!this.usingNativeControls_;
    }
    bool = !!bool;

    // Don't trigger a change event unless it actually changed
    if (this.usingNativeControls_ === bool) {
      return;
    }
    this.usingNativeControls_ = bool;
    if (this.usingNativeControls_) {
      this.addClass('vjs-using-native-controls');

      /**
       * player is using the native device controls
       *
       * @event Player#usingnativecontrols
       * @type {Event}
       */
      this.trigger('usingnativecontrols');
    } else {
      this.removeClass('vjs-using-native-controls');

      /**
       * player is using the custom HTML controls
       *
       * @event Player#usingcustomcontrols
       * @type {Event}
       */
      this.trigger('usingcustomcontrols');
    }
  }

  /**
   * Set or get the current MediaError
   *
   * @fires Player#error
   *
   * @param  {MediaError|string|number} [err]
   *         A MediaError or a string/number to be turned
   *         into a MediaError
   *
   * @return {MediaError|null}
   *         The current MediaError when getting (or null)
   */
  error(err) {
    if (err === undefined) {
      return this.error_ || null;
    }

    // allow hooks to modify error object
    hooks('beforeerror').forEach(hookFunction => {
      const newErr = hookFunction(this, err);
      if (!(isObject(newErr) && !Array.isArray(newErr) || typeof newErr === 'string' || typeof newErr === 'number' || newErr === null)) {
        this.log.error('please return a value that MediaError expects in beforeerror hooks');
        return;
      }
      err = newErr;
    });

    // Suppress the first error message for no compatible source until
    // user interaction
    if (this.options_.suppressNotSupportedError && err && err.code === 4) {
      const triggerSuppressedError = function () {
        this.error(err);
      };
      this.options_.suppressNotSupportedError = false;
      this.any(['click', 'touchstart'], triggerSuppressedError);
      this.one('loadstart', function () {
        this.off(['click', 'touchstart'], triggerSuppressedError);
      });
      return;
    }

    // restoring to default
    if (err === null) {
      this.error_ = err;
      this.removeClass('vjs-error');
      if (this.errorDisplay) {
        this.errorDisplay.close();
      }
      return;
    }
    this.error_ = new MediaError(err);

    // add the vjs-error classname to the player
    this.addClass('vjs-error');

    // log the name of the error type and any message
    // IE11 logs "[object object]" and required you to expand message to see error object
    log.error(`(CODE:${this.error_.code} ${MediaError.errorTypes[this.error_.code]})`, this.error_.message, this.error_);

    /**
     * @event Player#error
     * @type {Event}
     */
    this.trigger('error');

    // notify hooks of the per player error
    hooks('error').forEach(hookFunction => hookFunction(this, this.error_));
    return;
  }

  /**
   * Report user activity
   *
   * @param {Object} event
   *        Event object
   */
  reportUserActivity(event) {
    this.userActivity_ = true;
  }

  /**
   * Get/set if user is active
   *
   * @fires Player#useractive
   * @fires Player#userinactive
   *
   * @param {boolean} [bool]
   *        - true if the user is active
   *        - false if the user is inactive
   *
   * @return {boolean}
   *         The current value of userActive when getting
   */
  userActive(bool) {
    if (bool === undefined) {
      return this.userActive_;
    }
    bool = !!bool;
    if (bool === this.userActive_) {
      return;
    }
    this.userActive_ = bool;
    if (this.userActive_) {
      this.userActivity_ = true;
      this.removeClass('vjs-user-inactive');
      this.addClass('vjs-user-active');
      /**
       * @event Player#useractive
       * @type {Event}
       */
      this.trigger('useractive');
      return;
    }

    // Chrome/Safari/IE have bugs where when you change the cursor it can
    // trigger a mousemove event. This causes an issue when you're hiding
    // the cursor when the user is inactive, and a mousemove signals user
    // activity. Making it impossible to go into inactive mode. Specifically
    // this happens in fullscreen when we really need to hide the cursor.
    //
    // When this gets resolved in ALL browsers it can be removed
    // https://code.google.com/p/chromium/issues/detail?id=103041
    if (this.tech_) {
      this.tech_.one('mousemove', function (e) {
        e.stopPropagation();
        e.preventDefault();
      });
    }
    this.userActivity_ = false;
    this.removeClass('vjs-user-active');
    this.addClass('vjs-user-inactive');
    /**
     * @event Player#userinactive
     * @type {Event}
     */
    this.trigger('userinactive');
  }

  /**
   * Listen for user activity based on timeout value
   *
   * @private
   */
  listenForUserActivity_() {
    let mouseInProgress;
    let lastMoveX;
    let lastMoveY;
    const handleActivity = bind_(this, this.reportUserActivity);
    const handleMouseMove = function (e) {
      // #1068 - Prevent mousemove spamming
      // Chrome Bug: https://code.google.com/p/chromium/issues/detail?id=366970
      if (e.screenX !== lastMoveX || e.screenY !== lastMoveY) {
        lastMoveX = e.screenX;
        lastMoveY = e.screenY;
        handleActivity();
      }
    };
    const handleMouseDown = function () {
      handleActivity();
      // For as long as the they are touching the device or have their mouse down,
      // we consider them active even if they're not moving their finger or mouse.
      // So we want to continue to update that they are active
      this.clearInterval(mouseInProgress);
      // Setting userActivity=true now and setting the interval to the same time
      // as the activityCheck interval (250) should ensure we never miss the
      // next activityCheck
      mouseInProgress = this.setInterval(handleActivity, 250);
    };
    const handleMouseUpAndMouseLeave = function (event) {
      handleActivity();
      // Stop the interval that maintains activity if the mouse/touch is down
      this.clearInterval(mouseInProgress);
    };

    // Any mouse movement will be considered user activity
    this.on('mousedown', handleMouseDown);
    this.on('mousemove', handleMouseMove);
    this.on('mouseup', handleMouseUpAndMouseLeave);
    this.on('mouseleave', handleMouseUpAndMouseLeave);
    const controlBar = this.getChild('controlBar');

    // Fixes bug on Android & iOS where when tapping progressBar (when control bar is displayed)
    // controlBar would no longer be hidden by default timeout.
    if (controlBar && !IS_IOS && !IS_ANDROID) {
      controlBar.on('mouseenter', function (event) {
        if (this.player().options_.inactivityTimeout !== 0) {
          this.player().cache_.inactivityTimeout = this.player().options_.inactivityTimeout;
        }
        this.player().options_.inactivityTimeout = 0;
      });
      controlBar.on('mouseleave', function (event) {
        this.player().options_.inactivityTimeout = this.player().cache_.inactivityTimeout;
      });
    }

    // Listen for keyboard navigation
    // Shouldn't need to use inProgress interval because of key repeat
    this.on('keydown', handleActivity);
    this.on('keyup', handleActivity);

    // Run an interval every 250 milliseconds instead of stuffing everything into
    // the mousemove/touchmove function itself, to prevent performance degradation.
    // `this.reportUserActivity` simply sets this.userActivity_ to true, which
    // then gets picked up by this loop
    // http://ejohn.org/blog/learning-from-twitter/
    let inactivityTimeout;
    this.setInterval(function () {
      // Check to see if mouse/touch activity has happened
      if (!this.userActivity_) {
        return;
      }

      // Reset the activity tracker
      this.userActivity_ = false;

      // If the user state was inactive, set the state to active
      this.userActive(true);

      // Clear any existing inactivity timeout to start the timer over
      this.clearTimeout(inactivityTimeout);
      const timeout = this.options_.inactivityTimeout;
      if (timeout <= 0) {
        return;
      }

      // In <timeout> milliseconds, if no more activity has occurred the
      // user will be considered inactive
      inactivityTimeout = this.setTimeout(function () {
        // Protect against the case where the inactivityTimeout can trigger just
        // before the next user activity is picked up by the activity check loop
        // causing a flicker
        if (!this.userActivity_) {
          this.userActive(false);
        }
      }, timeout);
    }, 250);
  }

  /**
   * Gets or sets the current playback rate. A playback rate of
   * 1.0 represents normal speed and 0.5 would indicate half-speed
   * playback, for instance.
   *
   * @see https://html.spec.whatwg.org/multipage/embedded-content.html#dom-media-playbackrate
   *
   * @param {number} [rate]
   *       New playback rate to set.
   *
   * @return {number}
   *         The current playback rate when getting or 1.0
   */
  playbackRate(rate) {
    if (rate !== undefined) {
      // NOTE: this.cache_.lastPlaybackRate is set from the tech handler
      // that is registered above
      this.techCall_('setPlaybackRate', rate);
      return;
    }
    if (this.tech_ && this.tech_.featuresPlaybackRate) {
      return this.cache_.lastPlaybackRate || this.techGet_('playbackRate');
    }
    return 1.0;
  }

  /**
   * Gets or sets the current default playback rate. A default playback rate of
   * 1.0 represents normal speed and 0.5 would indicate half-speed playback, for instance.
   * defaultPlaybackRate will only represent what the initial playbackRate of a video was, not
   * not the current playbackRate.
   *
   * @see https://html.spec.whatwg.org/multipage/embedded-content.html#dom-media-defaultplaybackrate
   *
   * @param {number} [rate]
   *       New default playback rate to set.
   *
   * @return {number|Player}
   *         - The default playback rate when getting or 1.0
   *         - the player when setting
   */
  defaultPlaybackRate(rate) {
    if (rate !== undefined) {
      return this.techCall_('setDefaultPlaybackRate', rate);
    }
    if (this.tech_ && this.tech_.featuresPlaybackRate) {
      return this.techGet_('defaultPlaybackRate');
    }
    return 1.0;
  }

  /**
   * Gets or sets the audio flag
   *
   * @param {boolean} bool
   *        - true signals that this is an audio player
   *        - false signals that this is not an audio player
   *
   * @return {boolean}
   *         The current value of isAudio when getting
   */
  isAudio(bool) {
    if (bool !== undefined) {
      this.isAudio_ = !!bool;
      return;
    }
    return !!this.isAudio_;
  }
  enableAudioOnlyUI_() {
    // Update styling immediately to show the control bar so we can get its height
    this.addClass('vjs-audio-only-mode');
    const playerChildren = this.children();
    const controlBar = this.getChild('ControlBar');
    const controlBarHeight = controlBar && controlBar.currentHeight();

    // Hide all player components except the control bar. Control bar components
    // needed only for video are hidden with CSS
    playerChildren.forEach(child => {
      if (child === controlBar) {
        return;
      }
      if (child.el_ && !child.hasClass('vjs-hidden')) {
        child.hide();
        this.audioOnlyCache_.hiddenChildren.push(child);
      }
    });
    this.audioOnlyCache_.playerHeight = this.currentHeight();

    // Set the player height the same as the control bar
    this.height(controlBarHeight);
    this.trigger('audioonlymodechange');
  }
  disableAudioOnlyUI_() {
    this.removeClass('vjs-audio-only-mode');

    // Show player components that were previously hidden
    this.audioOnlyCache_.hiddenChildren.forEach(child => child.show());

    // Reset player height
    this.height(this.audioOnlyCache_.playerHeight);
    this.trigger('audioonlymodechange');
  }

  /**
   * Get the current audioOnlyMode state or set audioOnlyMode to true or false.
   *
   * Setting this to `true` will hide all player components except the control bar,
   * as well as control bar components needed only for video.
   *
   * @param {boolean} [value]
   *         The value to set audioOnlyMode to.
   *
   * @return {Promise|boolean}
   *        A Promise is returned when setting the state, and a boolean when getting
   *        the present state
   */
  audioOnlyMode(value) {
    if (typeof value !== 'boolean' || value === this.audioOnlyMode_) {
      return this.audioOnlyMode_;
    }
    this.audioOnlyMode_ = value;

    // Enable Audio Only Mode
    if (value) {
      const exitPromises = [];

      // Fullscreen and PiP are not supported in audioOnlyMode, so exit if we need to.
      if (this.isInPictureInPicture()) {
        exitPromises.push(this.exitPictureInPicture());
      }
      if (this.isFullscreen()) {
        exitPromises.push(this.exitFullscreen());
      }
      if (this.audioPosterMode()) {
        exitPromises.push(this.audioPosterMode(false));
      }
      return Promise.all(exitPromises).then(() => this.enableAudioOnlyUI_());
    }

    // Disable Audio Only Mode
    return Promise.resolve().then(() => this.disableAudioOnlyUI_());
  }
  enablePosterModeUI_() {
    // Hide the video element and show the poster image to enable posterModeUI
    const tech = this.tech_ && this.tech_;
    tech.hide();
    this.addClass('vjs-audio-poster-mode');
    this.trigger('audiopostermodechange');
  }
  disablePosterModeUI_() {
    // Show the video element and hide the poster image to disable posterModeUI
    const tech = this.tech_ && this.tech_;
    tech.show();
    this.removeClass('vjs-audio-poster-mode');
    this.trigger('audiopostermodechange');
  }

  /**
   * Get the current audioPosterMode state or set audioPosterMode to true or false
   *
   * @param {boolean} [value]
   *         The value to set audioPosterMode to.
   *
   * @return {Promise|boolean}
   *         A Promise is returned when setting the state, and a boolean when getting
   *        the present state
   */
  audioPosterMode(value) {
    if (typeof value !== 'boolean' || value === this.audioPosterMode_) {
      return this.audioPosterMode_;
    }
    this.audioPosterMode_ = value;
    if (value) {
      if (this.audioOnlyMode()) {
        const audioOnlyModePromise = this.audioOnlyMode(false);
        return audioOnlyModePromise.then(() => {
          // enable audio poster mode after audio only mode is disabled
          this.enablePosterModeUI_();
        });
      }
      return Promise.resolve().then(() => {
        // enable audio poster mode
        this.enablePosterModeUI_();
      });
    }
    return Promise.resolve().then(() => {
      // disable audio poster mode
      this.disablePosterModeUI_();
    });
  }

  /**
   * A helper method for adding a {@link TextTrack} to our
   * {@link TextTrackList}.
   *
   * In addition to the W3C settings we allow adding additional info through options.
   *
   * @see http://www.w3.org/html/wg/drafts/html/master/embedded-content-0.html#dom-media-addtexttrack
   *
   * @param {string} [kind]
   *        the kind of TextTrack you are adding
   *
   * @param {string} [label]
   *        the label to give the TextTrack label
   *
   * @param {string} [language]
   *        the language to set on the TextTrack
   *
   * @return {TextTrack|undefined}
   *         the TextTrack that was added or undefined
   *         if there is no tech
   */
  addTextTrack(kind, label, language) {
    if (this.tech_) {
      return this.tech_.addTextTrack(kind, label, language);
    }
  }

  /**
   * Create a remote {@link TextTrack} and an {@link HTMLTrackElement}.
   *
   * @param {Object} options
   *        Options to pass to {@link HTMLTrackElement} during creation. See
   *        {@link HTMLTrackElement} for object properties that you should use.
   *
   * @param {boolean} [manualCleanup=false] if set to true, the TextTrack will not be removed
   *                                        from the TextTrackList and HtmlTrackElementList
   *                                        after a source change
   *
   * @return { import('./tracks/html-track-element').default }
   *         the HTMLTrackElement that was created and added
   *         to the HtmlTrackElementList and the remote
   *         TextTrackList
   *
   */
  addRemoteTextTrack(options, manualCleanup) {
    if (this.tech_) {
      return this.tech_.addRemoteTextTrack(options, manualCleanup);
    }
  }

  /**
   * Remove a remote {@link TextTrack} from the respective
   * {@link TextTrackList} and {@link HtmlTrackElementList}.
   *
   * @param {Object} track
   *        Remote {@link TextTrack} to remove
   *
   * @return {undefined}
   *         does not return anything
   */
  removeRemoteTextTrack(obj = {}) {
    let {
      track
    } = obj;
    if (!track) {
      track = obj;
    }

    // destructure the input into an object with a track argument, defaulting to arguments[0]
    // default the whole argument to an empty object if nothing was passed in

    if (this.tech_) {
      return this.tech_.removeRemoteTextTrack(track);
    }
  }

  /**
   * Gets available media playback quality metrics as specified by the W3C's Media
   * Playback Quality API.
   *
   * @see [Spec]{@link https://wicg.github.io/media-playback-quality}
   *
   * @return {Object|undefined}
   *         An object with supported media playback quality metrics or undefined if there
   *         is no tech or the tech does not support it.
   */
  getVideoPlaybackQuality() {
    return this.techGet_('getVideoPlaybackQuality');
  }

  /**
   * Get video width
   *
   * @return {number}
   *         current video width
   */
  videoWidth() {
    return this.tech_ && this.tech_.videoWidth && this.tech_.videoWidth() || 0;
  }

  /**
   * Get video height
   *
   * @return {number}
   *         current video height
   */
  videoHeight() {
    return this.tech_ && this.tech_.videoHeight && this.tech_.videoHeight() || 0;
  }

  /**
   * The player's language code.
   *
   * Changing the language will trigger
   * [languagechange]{@link Player#event:languagechange}
   * which Components can use to update control text.
   * ClickableComponent will update its control text by default on
   * [languagechange]{@link Player#event:languagechange}.
   *
   * @fires Player#languagechange
   *
   * @param {string} [code]
   *        the language code to set the player to
   *
   * @return {string}
   *         The current language code when getting
   */
  language(code) {
    if (code === undefined) {
      return this.language_;
    }
    if (this.language_ !== String(code).toLowerCase()) {
      this.language_ = String(code).toLowerCase();

      // during first init, it's possible some things won't be evented
      if (isEvented(this)) {
        /**
        * fires when the player language change
        *
        * @event Player#languagechange
        * @type {Event}
        */
        this.trigger('languagechange');
      }
    }
  }

  /**
   * Get the player's language dictionary
   * Merge every time, because a newly added plugin might call videojs.addLanguage() at any time
   * Languages specified directly in the player options have precedence
   *
   * @return {Array}
   *         An array of of supported languages
   */
  languages() {
    return merge(Player.prototype.options_.languages, this.languages_);
  }

  /**
   * returns a JavaScript object representing the current track
   * information. **DOES not return it as JSON**
   *
   * @return {Object}
   *         Object representing the current of track info
   */
  toJSON() {
    const options = merge(this.options_);
    const tracks = options.tracks;
    options.tracks = [];
    for (let i = 0; i < tracks.length; i++) {
      let track = tracks[i];

      // deep merge tracks and null out player so no circular references
      track = merge(track);
      track.player = undefined;
      options.tracks[i] = track;
    }
    return options;
  }

  /**
   * Creates a simple modal dialog (an instance of the {@link ModalDialog}
   * component) that immediately overlays the player with arbitrary
   * content and removes itself when closed.
   *
   * @param {string|Function|Element|Array|null} content
   *        Same as {@link ModalDialog#content}'s param of the same name.
   *        The most straight-forward usage is to provide a string or DOM
   *        element.
   *
   * @param {Object} [options]
   *        Extra options which will be passed on to the {@link ModalDialog}.
   *
   * @return {ModalDialog}
   *         the {@link ModalDialog} that was created
   */
  createModal(content, options) {
    options = options || {};
    options.content = content || '';
    const modal = new ModalDialog(this, options);
    this.addChild(modal);
    modal.on('dispose', () => {
      this.removeChild(modal);
    });
    modal.open();
    return modal;
  }

  /**
   * Change breakpoint classes when the player resizes.
   *
   * @private
   */
  updateCurrentBreakpoint_() {
    if (!this.responsive()) {
      return;
    }
    const currentBreakpoint = this.currentBreakpoint();
    const currentWidth = this.currentWidth();
    for (let i = 0; i < BREAKPOINT_ORDER.length; i++) {
      const candidateBreakpoint = BREAKPOINT_ORDER[i];
      const maxWidth = this.breakpoints_[candidateBreakpoint];
      if (currentWidth <= maxWidth) {
        // The current breakpoint did not change, nothing to do.
        if (currentBreakpoint === candidateBreakpoint) {
          return;
        }

        // Only remove a class if there is a current breakpoint.
        if (currentBreakpoint) {
          this.removeClass(BREAKPOINT_CLASSES[currentBreakpoint]);
        }
        this.addClass(BREAKPOINT_CLASSES[candidateBreakpoint]);
        this.breakpoint_ = candidateBreakpoint;
        break;
      }
    }
  }

  /**
   * Removes the current breakpoint.
   *
   * @private
   */
  removeCurrentBreakpoint_() {
    const className = this.currentBreakpointClass();
    this.breakpoint_ = '';
    if (className) {
      this.removeClass(className);
    }
  }

  /**
   * Get or set breakpoints on the player.
   *
   * Calling this method with an object or `true` will remove any previous
   * custom breakpoints and start from the defaults again.
   *
   * @param  {Object|boolean} [breakpoints]
   *         If an object is given, it can be used to provide custom
   *         breakpoints. If `true` is given, will set default breakpoints.
   *         If this argument is not given, will simply return the current
   *         breakpoints.
   *
   * @param  {number} [breakpoints.tiny]
   *         The maximum width for the "vjs-layout-tiny" class.
   *
   * @param  {number} [breakpoints.xsmall]
   *         The maximum width for the "vjs-layout-x-small" class.
   *
   * @param  {number} [breakpoints.small]
   *         The maximum width for the "vjs-layout-small" class.
   *
   * @param  {number} [breakpoints.medium]
   *         The maximum width for the "vjs-layout-medium" class.
   *
   * @param  {number} [breakpoints.large]
   *         The maximum width for the "vjs-layout-large" class.
   *
   * @param  {number} [breakpoints.xlarge]
   *         The maximum width for the "vjs-layout-x-large" class.
   *
   * @param  {number} [breakpoints.huge]
   *         The maximum width for the "vjs-layout-huge" class.
   *
   * @return {Object}
   *         An object mapping breakpoint names to maximum width values.
   */
  breakpoints(breakpoints) {
    // Used as a getter.
    if (breakpoints === undefined) {
      return Object.assign(this.breakpoints_);
    }
    this.breakpoint_ = '';
    this.breakpoints_ = Object.assign({}, DEFAULT_BREAKPOINTS, breakpoints);

    // When breakpoint definitions change, we need to update the currently
    // selected breakpoint.
    this.updateCurrentBreakpoint_();

    // Clone the breakpoints before returning.
    return Object.assign(this.breakpoints_);
  }

  /**
   * Get or set a flag indicating whether or not this player should adjust
   * its UI based on its dimensions.
   *
   * @param  {boolean} value
   *         Should be `true` if the player should adjust its UI based on its
   *         dimensions; otherwise, should be `false`.
   *
   * @return {boolean}
   *         Will be `true` if this player should adjust its UI based on its
   *         dimensions; otherwise, will be `false`.
   */
  responsive(value) {
    // Used as a getter.
    if (value === undefined) {
      return this.responsive_;
    }
    value = Boolean(value);
    const current = this.responsive_;

    // Nothing changed.
    if (value === current) {
      return;
    }

    // The value actually changed, set it.
    this.responsive_ = value;

    // Start listening for breakpoints and set the initial breakpoint if the
    // player is now responsive.
    if (value) {
      this.on('playerresize', this.boundUpdateCurrentBreakpoint_);
      this.updateCurrentBreakpoint_();

      // Stop listening for breakpoints if the player is no longer responsive.
    } else {
      this.off('playerresize', this.boundUpdateCurrentBreakpoint_);
      this.removeCurrentBreakpoint_();
    }
    return value;
  }

  /**
   * Get current breakpoint name, if any.
   *
   * @return {string}
   *         If there is currently a breakpoint set, returns a the key from the
   *         breakpoints object matching it. Otherwise, returns an empty string.
   */
  currentBreakpoint() {
    return this.breakpoint_;
  }

  /**
   * Get the current breakpoint class name.
   *
   * @return {string}
   *         The matching class name (e.g. `"vjs-layout-tiny"` or
   *         `"vjs-layout-large"`) for the current breakpoint. Empty string if
   *         there is no current breakpoint.
   */
  currentBreakpointClass() {
    return BREAKPOINT_CLASSES[this.breakpoint_] || '';
  }

  /**
   * An object that describes a single piece of media.
   *
   * Properties that are not part of this type description will be retained; so,
   * this can be viewed as a generic metadata storage mechanism as well.
   *
   * @see      {@link https://wicg.github.io/mediasession/#the-mediametadata-interface}
   * @typedef  {Object} Player~MediaObject
   *
   * @property {string} [album]
   *           Unused, except if this object is passed to the `MediaSession`
   *           API.
   *
   * @property {string} [artist]
   *           Unused, except if this object is passed to the `MediaSession`
   *           API.
   *
   * @property {Object[]} [artwork]
   *           Unused, except if this object is passed to the `MediaSession`
   *           API. If not specified, will be populated via the `poster`, if
   *           available.
   *
   * @property {string} [poster]
   *           URL to an image that will display before playback.
   *
   * @property {Tech~SourceObject|Tech~SourceObject[]|string} [src]
   *           A single source object, an array of source objects, or a string
   *           referencing a URL to a media source. It is _highly recommended_
   *           that an object or array of objects is used here, so that source
   *           selection algorithms can take the `type` into account.
   *
   * @property {string} [title]
   *           Unused, except if this object is passed to the `MediaSession`
   *           API.
   *
   * @property {Object[]} [textTracks]
   *           An array of objects to be used to create text tracks, following
   *           the {@link https://www.w3.org/TR/html50/embedded-content-0.html#the-track-element|native track element format}.
   *           For ease of removal, these will be created as "remote" text
   *           tracks and set to automatically clean up on source changes.
   *
   *           These objects may have properties like `src`, `kind`, `label`,
   *           and `language`, see {@link Tech#createRemoteTextTrack}.
   */

  /**
   * Populate the player using a {@link Player~MediaObject|MediaObject}.
   *
   * @param  {Player~MediaObject} media
   *         A media object.
   *
   * @param  {Function} ready
   *         A callback to be called when the player is ready.
   */
  loadMedia(media, ready) {
    if (!media || typeof media !== 'object') {
      return;
    }
    this.reset();

    // Clone the media object so it cannot be mutated from outside.
    this.cache_.media = merge(media);
    const {
      artist,
      artwork,
      description,
      poster,
      src,
      textTracks,
      title
    } = this.cache_.media;

    // If `artwork` is not given, create it using `poster`.
    if (!artwork && poster) {
      this.cache_.media.artwork = [{
        src: poster,
        type: getMimetype(poster)
      }];
    }
    if (src) {
      this.src(src);
    }
    if (poster) {
      this.poster(poster);
    }
    if (Array.isArray(textTracks)) {
      textTracks.forEach(tt => this.addRemoteTextTrack(tt, false));
    }
    if (this.titleBar) {
      this.titleBar.update({
        title,
        description: description || artist || ''
      });
    }
    this.ready(ready);
  }

  /**
   * Get a clone of the current {@link Player~MediaObject} for this player.
   *
   * If the `loadMedia` method has not been used, will attempt to return a
   * {@link Player~MediaObject} based on the current state of the player.
   *
   * @return {Player~MediaObject}
   */
  getMedia() {
    if (!this.cache_.media) {
      const poster = this.poster();
      const src = this.currentSources();
      const textTracks = Array.prototype.map.call(this.remoteTextTracks(), tt => ({
        kind: tt.kind,
        label: tt.label,
        language: tt.language,
        src: tt.src
      }));
      const media = {
        src,
        textTracks
      };
      if (poster) {
        media.poster = poster;
        media.artwork = [{
          src: media.poster,
          type: getMimetype(media.poster)
        }];
      }
      return media;
    }
    return merge(this.cache_.media);
  }

  /**
   * Gets tag settings
   *
   * @param {Element} tag
   *        The player tag
   *
   * @return {Object}
   *         An object containing all of the settings
   *         for a player tag
   */
  static getTagSettings(tag) {
    const baseOptions = {
      sources: [],
      tracks: []
    };
    const tagOptions = getAttributes(tag);
    const dataSetup = tagOptions['data-setup'];
    if (hasClass(tag, 'vjs-fill')) {
      tagOptions.fill = true;
    }
    if (hasClass(tag, 'vjs-fluid')) {
      tagOptions.fluid = true;
    }

    // Check if data-setup attr exists.
    if (dataSetup !== null) {
      // Parse options JSON
      // If empty string, make it a parsable json object.
      const [err, data] = safeParseTuple(dataSetup || '{}');
      if (err) {
        log.error(err);
      }
      Object.assign(tagOptions, data);
    }
    Object.assign(baseOptions, tagOptions);

    // Get tag children settings
    if (tag.hasChildNodes()) {
      const children = tag.childNodes;
      for (let i = 0, j = children.length; i < j; i++) {
        const child = children[i];
        // Change case needed: http://ejohn.org/blog/nodename-case-sensitivity/
        const childName = child.nodeName.toLowerCase();
        if (childName === 'source') {
          baseOptions.sources.push(getAttributes(child));
        } else if (childName === 'track') {
          baseOptions.tracks.push(getAttributes(child));
        }
      }
    }
    return baseOptions;
  }

  /**
   * Set debug mode to enable/disable logs at info level.
   *
   * @param {boolean} enabled
   * @fires Player#debugon
   * @fires Player#debugoff
   */
  debug(enabled) {
    if (enabled === undefined) {
      return this.debugEnabled_;
    }
    if (enabled) {
      this.trigger('debugon');
      this.previousLogLevel_ = this.log.level;
      this.log.level('debug');
      this.debugEnabled_ = true;
    } else {
      this.trigger('debugoff');
      this.log.level(this.previousLogLevel_);
      this.previousLogLevel_ = undefined;
      this.debugEnabled_ = false;
    }
  }

  /**
   * Set or get current playback rates.
   * Takes an array and updates the playback rates menu with the new items.
   * Pass in an empty array to hide the menu.
   * Values other than arrays are ignored.
   *
   * @fires Player#playbackrateschange
   * @param {number[]} newRates
   *                   The new rates that the playback rates menu should update to.
   *                   An empty array will hide the menu
   * @return {number[]} When used as a getter will return the current playback rates
   */
  playbackRates(newRates) {
    if (newRates === undefined) {
      return this.cache_.playbackRates;
    }

    // ignore any value that isn't an array
    if (!Array.isArray(newRates)) {
      return;
    }

    // ignore any arrays that don't only contain numbers
    if (!newRates.every(rate => typeof rate === 'number')) {
      return;
    }
    this.cache_.playbackRates = newRates;

    /**
    * fires when the playback rates in a player are changed
    *
    * @event Player#playbackrateschange
    * @type {Event}
    */
    this.trigger('playbackrateschange');
  }
}

/**
 * Get the {@link VideoTrackList}
 *
 * @link https://html.spec.whatwg.org/multipage/embedded-content.html#videotracklist
 *
 * @return {VideoTrackList}
 *         the current video track list
 *
 * @method Player.prototype.videoTracks
 */

/**
 * Get the {@link AudioTrackList}
 *
 * @link https://html.spec.whatwg.org/multipage/embedded-content.html#audiotracklist
 *
 * @return {AudioTrackList}
 *         the current audio track list
 *
 * @method Player.prototype.audioTracks
 */

/**
 * Get the {@link TextTrackList}
 *
 * @link http://www.w3.org/html/wg/drafts/html/master/embedded-content-0.html#dom-media-texttracks
 *
 * @return {TextTrackList}
 *         the current text track list
 *
 * @method Player.prototype.textTracks
 */

/**
 * Get the remote {@link TextTrackList}
 *
 * @return {TextTrackList}
 *         The current remote text track list
 *
 * @method Player.prototype.remoteTextTracks
 */

/**
 * Get the remote {@link HtmlTrackElementList} tracks.
 *
 * @return {HtmlTrackElementList}
 *         The current remote text track element list
 *
 * @method Player.prototype.remoteTextTrackEls
 */

ALL.names.forEach(function (name) {
  const props = ALL[name];
  Player.prototype[props.getterName] = function () {
    if (this.tech_) {
      return this.tech_[props.getterName]();
    }

    // if we have not yet loadTech_, we create {video,audio,text}Tracks_
    // these will be passed to the tech during loading
    this[props.privateName] = this[props.privateName] || new props.ListClass();
    return this[props.privateName];
  };
});

/**
 * Get or set the `Player`'s crossorigin option. For the HTML5 player, this
 * sets the `crossOrigin` property on the `<video>` tag to control the CORS
 * behavior.
 *
 * @see [Video Element Attributes]{@link https://developer.mozilla.org/en-US/docs/Web/HTML/Element/video#attr-crossorigin}
 *
 * @param {string} [value]
 *        The value to set the `Player`'s crossorigin to. If an argument is
 *        given, must be one of `anonymous` or `use-credentials`.
 *
 * @return {string|undefined}
 *         - The current crossorigin value of the `Player` when getting.
 *         - undefined when setting
 */
Player.prototype.crossorigin = Player.prototype.crossOrigin;

/**
 * Global enumeration of players.
 *
 * The keys are the player IDs and the values are either the {@link Player}
 * instance or `null` for disposed players.
 *
 * @type {Object}
 */
Player.players = {};
const navigator = window.navigator;

/*
 * Player instance options, surfaced using options
 * options = Player.prototype.options_
 * Make changes in options, not here.
 *
 * @type {Object}
 * @private
 */
Player.prototype.options_ = {
  // Default order of fallback technology
  techOrder: Tech.defaultTechOrder_,
  html5: {},
  // enable sourceset by default
  enableSourceset: true,
  // default inactivity timeout
  inactivityTimeout: 2000,
  // default playback rates
  playbackRates: [],
  // Add playback rate selection by adding rates
  // 'playbackRates': [0.5, 1, 1.5, 2],
  liveui: false,
  // Included control sets
  children: ['mediaLoader', 'posterImage', 'titleBar', 'textTrackDisplay', 'loadingSpinner', 'bigPlayButton', 'liveTracker', 'controlBar', 'errorDisplay', 'textTrackSettings', 'resizeManager'],
  language: navigator && (navigator.languages && navigator.languages[0] || navigator.userLanguage || navigator.language) || 'en',
  // locales and their language translations
  languages: {},
  // Default message to show when a video cannot be played.
  notSupportedMessage: 'No compatible source was found for this media.',
  normalizeAutoplay: false,
  fullscreen: {
    options: {
      navigationUI: 'hide'
    }
  },
  breakpoints: {},
  responsive: false,
  audioOnlyMode: false,
  audioPosterMode: false
};
[
/**
 * Returns whether or not the player is in the "ended" state.
 *
 * @return {Boolean} True if the player is in the ended state, false if not.
 * @method Player#ended
 */
'ended',
/**
 * Returns whether or not the player is in the "seeking" state.
 *
 * @return {Boolean} True if the player is in the seeking state, false if not.
 * @method Player#seeking
 */
'seeking',
/**
 * Returns the TimeRanges of the media that are currently available
 * for seeking to.
 *
 * @return {TimeRanges} the seekable intervals of the media timeline
 * @method Player#seekable
 */
'seekable',
/**
 * Returns the current state of network activity for the element, from
 * the codes in the list below.
 * - NETWORK_EMPTY (numeric value 0)
 *   The element has not yet been initialised. All attributes are in
 *   their initial states.
 * - NETWORK_IDLE (numeric value 1)
 *   The element's resource selection algorithm is active and has
 *   selected a resource, but it is not actually using the network at
 *   this time.
 * - NETWORK_LOADING (numeric value 2)
 *   The user agent is actively trying to download data.
 * - NETWORK_NO_SOURCE (numeric value 3)
 *   The element's resource selection algorithm is active, but it has
 *   not yet found a resource to use.
 *
 * @see https://html.spec.whatwg.org/multipage/embedded-content.html#network-states
 * @return {number} the current network activity state
 * @method Player#networkState
 */
'networkState',
/**
 * Returns a value that expresses the current state of the element
 * with respect to rendering the current playback position, from the
 * codes in the list below.
 * - HAVE_NOTHING (numeric value 0)
 *   No information regarding the media resource is available.
 * - HAVE_METADATA (numeric value 1)
 *   Enough of the resource has been obtained that the duration of the
 *   resource is available.
 * - HAVE_CURRENT_DATA (numeric value 2)
 *   Data for the immediate current playback position is available.
 * - HAVE_FUTURE_DATA (numeric value 3)
 *   Data for the immediate current playback position is available, as
 *   well as enough data for the user agent to advance the current
 *   playback position in the direction of playback.
 * - HAVE_ENOUGH_DATA (numeric value 4)
 *   The user agent estimates that enough data is available for
 *   playback to proceed uninterrupted.
 *
 * @see https://html.spec.whatwg.org/multipage/embedded-content.html#dom-media-readystate
 * @return {number} the current playback rendering state
 * @method Player#readyState
 */
'readyState'].forEach(function (fn) {
  Player.prototype[fn] = function () {
    return this.techGet_(fn);
  };
});
TECH_EVENTS_RETRIGGER.forEach(function (event) {
  Player.prototype[`handleTech${toTitleCase(event)}_`] = function () {
    return this.trigger(event);
  };
});

/**
 * Fired when the player has initial duration and dimension information
 *
 * @event Player#loadedmetadata
 * @type {Event}
 */

/**
 * Fired when the player has downloaded data at the current playback position
 *
 * @event Player#loadeddata
 * @type {Event}
 */

/**
 * Fired when the current playback position has changed *
 * During playback this is fired every 15-250 milliseconds, depending on the
 * playback technology in use.
 *
 * @event Player#timeupdate
 * @type {Event}
 */

/**
 * Fired when the volume changes
 *
 * @event Player#volumechange
 * @type {Event}
 */

/**
 * Reports whether or not a player has a plugin available.
 *
 * This does not report whether or not the plugin has ever been initialized
 * on this player. For that, [usingPlugin]{@link Player#usingPlugin}.
 *
 * @method Player#hasPlugin
 * @param  {string}  name
 *         The name of a plugin.
 *
 * @return {boolean}
 *         Whether or not this player has the requested plugin available.
 */

/**
 * Reports whether or not a player is using a plugin by name.
 *
 * For basic plugins, this only reports whether the plugin has _ever_ been
 * initialized on this player.
 *
 * @method Player#usingPlugin
 * @param  {string} name
 *         The name of a plugin.
 *
 * @return {boolean}
 *         Whether or not this player is using the requested plugin.
 */

Component.registerComponent('Player', Player);

/**
 * @file plugin.js
 */

/**
 * The base plugin name.
 *
 * @private
 * @constant
 * @type {string}
 */
const BASE_PLUGIN_NAME = 'plugin';

/**
 * The key on which a player's active plugins cache is stored.
 *
 * @private
 * @constant
 * @type     {string}
 */
const PLUGIN_CACHE_KEY = 'activePlugins_';

/**
 * Stores registered plugins in a private space.
 *
 * @private
 * @type    {Object}
 */
const pluginStorage = {};

/**
 * Reports whether or not a plugin has been registered.
 *
 * @private
 * @param   {string} name
 *          The name of a plugin.
 *
 * @return {boolean}
 *          Whether or not the plugin has been registered.
 */
const pluginExists = name => pluginStorage.hasOwnProperty(name);

/**
 * Get a single registered plugin by name.
 *
 * @private
 * @param   {string} name
 *          The name of a plugin.
 *
 * @return {typeof Plugin|Function|undefined}
 *          The plugin (or undefined).
 */
const getPlugin = name => pluginExists(name) ? pluginStorage[name] : undefined;

/**
 * Marks a plugin as "active" on a player.
 *
 * Also, ensures that the player has an object for tracking active plugins.
 *
 * @private
 * @param   {Player} player
 *          A Video.js player instance.
 *
 * @param   {string} name
 *          The name of a plugin.
 */
const markPluginAsActive = (player, name) => {
  player[PLUGIN_CACHE_KEY] = player[PLUGIN_CACHE_KEY] || {};
  player[PLUGIN_CACHE_KEY][name] = true;
};

/**
 * Triggers a pair of plugin setup events.
 *
 * @private
 * @param  {Player} player
 *         A Video.js player instance.
 *
 * @param  {Plugin~PluginEventHash} hash
 *         A plugin event hash.
 *
 * @param  {boolean} [before]
 *         If true, prefixes the event name with "before". In other words,
 *         use this to trigger "beforepluginsetup" instead of "pluginsetup".
 */
const triggerSetupEvent = (player, hash, before) => {
  const eventName = (before ? 'before' : '') + 'pluginsetup';
  player.trigger(eventName, hash);
  player.trigger(eventName + ':' + hash.name, hash);
};

/**
 * Takes a basic plugin function and returns a wrapper function which marks
 * on the player that the plugin has been activated.
 *
 * @private
 * @param   {string} name
 *          The name of the plugin.
 *
 * @param   {Function} plugin
 *          The basic plugin.
 *
 * @return {Function}
 *          A wrapper function for the given plugin.
 */
const createBasicPlugin = function (name, plugin) {
  const basicPluginWrapper = function () {
    // We trigger the "beforepluginsetup" and "pluginsetup" events on the player
    // regardless, but we want the hash to be consistent with the hash provided
    // for advanced plugins.
    //
    // The only potentially counter-intuitive thing here is the `instance` in
    // the "pluginsetup" event is the value returned by the `plugin` function.
    triggerSetupEvent(this, {
      name,
      plugin,
      instance: null
    }, true);
    const instance = plugin.apply(this, arguments);
    markPluginAsActive(this, name);
    triggerSetupEvent(this, {
      name,
      plugin,
      instance
    });
    return instance;
  };
  Object.keys(plugin).forEach(function (prop) {
    basicPluginWrapper[prop] = plugin[prop];
  });
  return basicPluginWrapper;
};

/**
 * Takes a plugin sub-class and returns a factory function for generating
 * instances of it.
 *
 * This factory function will replace itself with an instance of the requested
 * sub-class of Plugin.
 *
 * @private
 * @param   {string} name
 *          The name of the plugin.
 *
 * @param   {Plugin} PluginSubClass
 *          The advanced plugin.
 *
 * @return {Function}
 */
const createPluginFactory = (name, PluginSubClass) => {
  // Add a `name` property to the plugin prototype so that each plugin can
  // refer to itself by name.
  PluginSubClass.prototype.name = name;
  return function (...args) {
    triggerSetupEvent(this, {
      name,
      plugin: PluginSubClass,
      instance: null
    }, true);
    const instance = new PluginSubClass(...[this, ...args]);

    // The plugin is replaced by a function that returns the current instance.
    this[name] = () => instance;
    triggerSetupEvent(this, instance.getEventHash());
    return instance;
  };
};

/**
 * Parent class for all advanced plugins.
 *
 * @mixes   module:evented~EventedMixin
 * @mixes   module:stateful~StatefulMixin
 * @fires   Player#beforepluginsetup
 * @fires   Player#beforepluginsetup:$name
 * @fires   Player#pluginsetup
 * @fires   Player#pluginsetup:$name
 * @listens Player#dispose
 * @throws  {Error}
 *          If attempting to instantiate the base {@link Plugin} class
 *          directly instead of via a sub-class.
 */
class Plugin {
  /**
   * Creates an instance of this class.
   *
   * Sub-classes should call `super` to ensure plugins are properly initialized.
   *
   * @param {Player} player
   *        A Video.js player instance.
   */
  constructor(player) {
    if (this.constructor === Plugin) {
      throw new Error('Plugin must be sub-classed; not directly instantiated.');
    }
    this.player = player;
    if (!this.log) {
      this.log = this.player.log.createLogger(this.name);
    }

    // Make this object evented, but remove the added `trigger` method so we
    // use the prototype version instead.
    evented(this);
    delete this.trigger;
    stateful(this, this.constructor.defaultState);
    markPluginAsActive(player, this.name);

    // Auto-bind the dispose method so we can use it as a listener and unbind
    // it later easily.
    this.dispose = this.dispose.bind(this);

    // If the player is disposed, dispose the plugin.
    player.on('dispose', this.dispose);
  }

  /**
   * Get the version of the plugin that was set on <pluginName>.VERSION
   */
  version() {
    return this.constructor.VERSION;
  }

  /**
   * Each event triggered by plugins includes a hash of additional data with
   * conventional properties.
   *
   * This returns that object or mutates an existing hash.
   *
   * @param   {Object} [hash={}]
   *          An object to be used as event an event hash.
   *
   * @return {Plugin~PluginEventHash}
   *          An event hash object with provided properties mixed-in.
   */
  getEventHash(hash = {}) {
    hash.name = this.name;
    hash.plugin = this.constructor;
    hash.instance = this;
    return hash;
  }

  /**
   * Triggers an event on the plugin object and overrides
   * {@link module:evented~EventedMixin.trigger|EventedMixin.trigger}.
   *
   * @param   {string|Object} event
   *          An event type or an object with a type property.
   *
   * @param   {Object} [hash={}]
   *          Additional data hash to merge with a
   *          {@link Plugin~PluginEventHash|PluginEventHash}.
   *
   * @return {boolean}
   *          Whether or not default was prevented.
   */
  trigger(event, hash = {}) {
    return trigger(this.eventBusEl_, event, this.getEventHash(hash));
  }

  /**
   * Handles "statechanged" events on the plugin. No-op by default, override by
   * subclassing.
   *
   * @abstract
   * @param    {Event} e
   *           An event object provided by a "statechanged" event.
   *
   * @param    {Object} e.changes
   *           An object describing changes that occurred with the "statechanged"
   *           event.
   */
  handleStateChanged(e) {}

  /**
   * Disposes a plugin.
   *
   * Subclasses can override this if they want, but for the sake of safety,
   * it's probably best to subscribe the "dispose" event.
   *
   * @fires Plugin#dispose
   */
  dispose() {
    const {
      name,
      player
    } = this;

    /**
     * Signals that a advanced plugin is about to be disposed.
     *
     * @event Plugin#dispose
     * @type  {Event}
     */
    this.trigger('dispose');
    this.off();
    player.off('dispose', this.dispose);

    // Eliminate any possible sources of leaking memory by clearing up
    // references between the player and the plugin instance and nulling out
    // the plugin's state and replacing methods with a function that throws.
    player[PLUGIN_CACHE_KEY][name] = false;
    this.player = this.state = null;

    // Finally, replace the plugin name on the player with a new factory
    // function, so that the plugin is ready to be set up again.
    player[name] = createPluginFactory(name, pluginStorage[name]);
  }

  /**
   * Determines if a plugin is a basic plugin (i.e. not a sub-class of `Plugin`).
   *
   * @param   {string|Function} plugin
   *          If a string, matches the name of a plugin. If a function, will be
   *          tested directly.
   *
   * @return {boolean}
   *          Whether or not a plugin is a basic plugin.
   */
  static isBasic(plugin) {
    const p = typeof plugin === 'string' ? getPlugin(plugin) : plugin;
    return typeof p === 'function' && !Plugin.prototype.isPrototypeOf(p.prototype);
  }

  /**
   * Register a Video.js plugin.
   *
   * @param   {string} name
   *          The name of the plugin to be registered. Must be a string and
   *          must not match an existing plugin or a method on the `Player`
   *          prototype.
   *
   * @param   {typeof Plugin|Function} plugin
   *          A sub-class of `Plugin` or a function for basic plugins.
   *
   * @return {typeof Plugin|Function}
   *          For advanced plugins, a factory function for that plugin. For
   *          basic plugins, a wrapper function that initializes the plugin.
   */
  static registerPlugin(name, plugin) {
    if (typeof name !== 'string') {
      throw new Error(`Illegal plugin name, "${name}", must be a string, was ${typeof name}.`);
    }
    if (pluginExists(name)) {
      log.warn(`A plugin named "${name}" already exists. You may want to avoid re-registering plugins!`);
    } else if (Player.prototype.hasOwnProperty(name)) {
      throw new Error(`Illegal plugin name, "${name}", cannot share a name with an existing player method!`);
    }
    if (typeof plugin !== 'function') {
      throw new Error(`Illegal plugin for "${name}", must be a function, was ${typeof plugin}.`);
    }
    pluginStorage[name] = plugin;

    // Add a player prototype method for all sub-classed plugins (but not for
    // the base Plugin class).
    if (name !== BASE_PLUGIN_NAME) {
      if (Plugin.isBasic(plugin)) {
        Player.prototype[name] = createBasicPlugin(name, plugin);
      } else {
        Player.prototype[name] = createPluginFactory(name, plugin);
      }
    }
    return plugin;
  }

  /**
   * De-register a Video.js plugin.
   *
   * @param  {string} name
   *         The name of the plugin to be de-registered. Must be a string that
   *         matches an existing plugin.
   *
   * @throws {Error}
   *         If an attempt is made to de-register the base plugin.
   */
  static deregisterPlugin(name) {
    if (name === BASE_PLUGIN_NAME) {
      throw new Error('Cannot de-register base plugin.');
    }
    if (pluginExists(name)) {
      delete pluginStorage[name];
      delete Player.prototype[name];
    }
  }

  /**
   * Gets an object containing multiple Video.js plugins.
   *
   * @param   {Array} [names]
   *          If provided, should be an array of plugin names. Defaults to _all_
   *          plugin names.
   *
   * @return {Object|undefined}
   *          An object containing plugin(s) associated with their name(s) or
   *          `undefined` if no matching plugins exist).
   */
  static getPlugins(names = Object.keys(pluginStorage)) {
    let result;
    names.forEach(name => {
      const plugin = getPlugin(name);
      if (plugin) {
        result = result || {};
        result[name] = plugin;
      }
    });
    return result;
  }

  /**
   * Gets a plugin's version, if available
   *
   * @param   {string} name
   *          The name of a plugin.
   *
   * @return {string}
   *          The plugin's version or an empty string.
   */
  static getPluginVersion(name) {
    const plugin = getPlugin(name);
    return plugin && plugin.VERSION || '';
  }
}

/**
 * Gets a plugin by name if it exists.
 *
 * @static
 * @method   getPlugin
 * @memberOf Plugin
 * @param    {string} name
 *           The name of a plugin.
 *
 * @returns  {typeof Plugin|Function|undefined}
 *           The plugin (or `undefined`).
 */
Plugin.getPlugin = getPlugin;

/**
 * The name of the base plugin class as it is registered.
 *
 * @type {string}
 */
Plugin.BASE_PLUGIN_NAME = BASE_PLUGIN_NAME;
Plugin.registerPlugin(BASE_PLUGIN_NAME, Plugin);

/**
 * Documented in player.js
 *
 * @ignore
 */
Player.prototype.usingPlugin = function (name) {
  return !!this[PLUGIN_CACHE_KEY] && this[PLUGIN_CACHE_KEY][name] === true;
};

/**
 * Documented in player.js
 *
 * @ignore
 */
Player.prototype.hasPlugin = function (name) {
  return !!pluginExists(name);
};

/**
 * Signals that a plugin is about to be set up on a player.
 *
 * @event    Player#beforepluginsetup
 * @type     {Plugin~PluginEventHash}
 */

/**
 * Signals that a plugin is about to be set up on a player - by name. The name
 * is the name of the plugin.
 *
 * @event    Player#beforepluginsetup:$name
 * @type     {Plugin~PluginEventHash}
 */

/**
 * Signals that a plugin has just been set up on a player.
 *
 * @event    Player#pluginsetup
 * @type     {Plugin~PluginEventHash}
 */

/**
 * Signals that a plugin has just been set up on a player - by name. The name
 * is the name of the plugin.
 *
 * @event    Player#pluginsetup:$name
 * @type     {Plugin~PluginEventHash}
 */

/**
 * @typedef  {Object} Plugin~PluginEventHash
 *
 * @property {string} instance
 *           For basic plugins, the return value of the plugin function. For
 *           advanced plugins, the plugin instance on which the event is fired.
 *
 * @property {string} name
 *           The name of the plugin.
 *
 * @property {string} plugin
 *           For basic plugins, the plugin function. For advanced plugins, the
 *           plugin class/constructor.
 */

/**
 * @file deprecate.js
 * @module deprecate
 */

/**
 * Decorate a function with a deprecation message the first time it is called.
 *
 * @param  {string}   message
 *         A deprecation message to log the first time the returned function
 *         is called.
 *
 * @param  {Function} fn
 *         The function to be deprecated.
 *
 * @return {Function}
 *         A wrapper function that will log a deprecation warning the first
 *         time it is called. The return value will be the return value of
 *         the wrapped function.
 */
function deprecate(message, fn) {
  let warned = false;
  return function (...args) {
    if (!warned) {
      log.warn(message);
    }
    warned = true;
    return fn.apply(this, args);
  };
}

/**
 * Internal function used to mark a function as deprecated in the next major
 * version with consistent messaging.
 *
 * @param  {number}   major   The major version where it will be removed
 * @param  {string}   oldName The old function name
 * @param  {string}   newName The new function name
 * @param  {Function} fn      The function to deprecate
 * @return {Function}         The decorated function
 */
function deprecateForMajor(major, oldName, newName, fn) {
  return deprecate(`${oldName} is deprecated and will be removed in ${major}.0; please use ${newName} instead.`, fn);
}

/**
 * @file video.js
 * @module videojs
 */

/**
 * Normalize an `id` value by trimming off a leading `#`
 *
 * @private
 * @param   {string} id
 *          A string, maybe with a leading `#`.
 *
 * @return {string}
 *          The string, without any leading `#`.
 */
const normalizeId = id => id.indexOf('#') === 0 ? id.slice(1) : id;

/**
 * A callback that is called when a component is ready. Does not have any
 * parameters and any callback value will be ignored. See: {@link Component~ReadyCallback}
 *
 * @callback ReadyCallback
 */

/**
 * The `videojs()` function doubles as the main function for users to create a
 * {@link Player} instance as well as the main library namespace.
 *
 * It can also be used as a getter for a pre-existing {@link Player} instance.
 * However, we _strongly_ recommend using `videojs.getPlayer()` for this
 * purpose because it avoids any potential for unintended initialization.
 *
 * Due to [limitations](https://github.com/jsdoc3/jsdoc/issues/955#issuecomment-313829149)
 * of our JSDoc template, we cannot properly document this as both a function
 * and a namespace, so its function signature is documented here.
 *
 * #### Arguments
 * ##### id
 * string|Element, **required**
 *
 * Video element or video element ID.
 *
 * ##### options
 * Object, optional
 *
 * Options object for providing settings.
 * See: [Options Guide](https://docs.videojs.com/tutorial-options.html).
 *
 * ##### ready
 * {@link Component~ReadyCallback}, optional
 *
 * A function to be called when the {@link Player} and {@link Tech} are ready.
 *
 * #### Return Value
 *
 * The `videojs()` function returns a {@link Player} instance.
 *
 * @namespace
 *
 * @borrows AudioTrack as AudioTrack
 * @borrows Component.getComponent as getComponent
 * @borrows module:events.on as on
 * @borrows module:events.one as one
 * @borrows module:events.off as off
 * @borrows module:events.trigger as trigger
 * @borrows EventTarget as EventTarget
 * @borrows module:middleware.use as use
 * @borrows Player.players as players
 * @borrows Plugin.registerPlugin as registerPlugin
 * @borrows Plugin.deregisterPlugin as deregisterPlugin
 * @borrows Plugin.getPlugins as getPlugins
 * @borrows Plugin.getPlugin as getPlugin
 * @borrows Plugin.getPluginVersion as getPluginVersion
 * @borrows Tech.getTech as getTech
 * @borrows Tech.registerTech as registerTech
 * @borrows TextTrack as TextTrack
 * @borrows VideoTrack as VideoTrack
 *
 * @param  {string|Element} id
 *         Video element or video element ID.
 *
 * @param  {Object} [options]
 *         Options object for providing settings.
 *         See: [Options Guide](https://docs.videojs.com/tutorial-options.html).
 *
 * @param  {ReadyCallback} [ready]
 *         A function to be called when the {@link Player} and {@link Tech} are
 *         ready.
 *
 * @return {Player}
 *         The `videojs()` function returns a {@link Player|Player} instance.
 */
function videojs(id, options, ready) {
  let player = videojs.getPlayer(id);
  if (player) {
    if (options) {
      log.warn(`Player "${id}" is already initialised. Options will not be applied.`);
    }
    if (ready) {
      player.ready(ready);
    }
    return player;
  }
  const el = typeof id === 'string' ? $('#' + normalizeId(id)) : id;
  if (!isEl(el)) {
    throw new TypeError('The element or ID supplied is not valid. (videojs)');
  }

  // document.body.contains(el) will only check if el is contained within that one document.
  // This causes problems for elements in iframes.
  // Instead, use the element's ownerDocument instead of the global document.
  // This will make sure that the element is indeed in the dom of that document.
  // Additionally, check that the document in question has a default view.
  // If the document is no longer attached to the dom, the defaultView of the document will be null.
  if (!el.ownerDocument.defaultView || !el.ownerDocument.body.contains(el)) {
    log.warn('The element supplied is not included in the DOM');
  }
  options = options || {};

  // Store a copy of the el before modification, if it is to be restored in destroy()
  // If div ingest, store the parent div
  if (options.restoreEl === true) {
    options.restoreEl = (el.parentNode && el.parentNode.hasAttribute('data-vjs-player') ? el.parentNode : el).cloneNode(true);
  }
  hooks('beforesetup').forEach(hookFunction => {
    const opts = hookFunction(el, merge(options));
    if (!isObject(opts) || Array.isArray(opts)) {
      log.error('please return an object in beforesetup hooks');
      return;
    }
    options = merge(options, opts);
  });

  // We get the current "Player" component here in case an integration has
  // replaced it with a custom player.
  const PlayerComponent = Component.getComponent('Player');
  player = new PlayerComponent(el, options, ready);
  hooks('setup').forEach(hookFunction => hookFunction(player));
  return player;
}
videojs.hooks_ = hooks_;
videojs.hooks = hooks;
videojs.hook = hook;
videojs.hookOnce = hookOnce;
videojs.removeHook = removeHook;

// Add default styles
if (window.VIDEOJS_NO_DYNAMIC_STYLE !== true && isReal()) {
  let style = $('.vjs-styles-defaults');
  if (!style) {
    style = createStyleElement('vjs-styles-defaults');
    const head = $('head');
    if (head) {
      head.insertBefore(style, head.firstChild);
    }
    setTextContent(style, `
      .video-js {
        width: 300px;
        height: 150px;
      }

      .vjs-fluid:not(.vjs-audio-only-mode) {
        padding-top: 56.25%
      }
    `);
  }
}

// Run Auto-load players
// You have to wait at least once in case this script is loaded after your
// video in the DOM (weird behavior only with minified version)
autoSetupTimeout(1, videojs);

/**
 * Current Video.js version. Follows [semantic versioning](https://semver.org/).
 *
 * @type {string}
 */
videojs.VERSION = version;

/**
 * The global options object. These are the settings that take effect
 * if no overrides are specified when the player is created.
 *
 * @type {Object}
 */
videojs.options = Player.prototype.options_;

/**
 * Get an object with the currently created players, keyed by player ID
 *
 * @return {Object}
 *         The created players
 */
videojs.getPlayers = () => Player.players;

/**
 * Get a single player based on an ID or DOM element.
 *
 * This is useful if you want to check if an element or ID has an associated
 * Video.js player, but not create one if it doesn't.
 *
 * @param   {string|Element} id
 *          An HTML element - `<video>`, `<audio>`, or `<video-js>` -
 *          or a string matching the `id` of such an element.
 *
 * @return {Player|undefined}
 *          A player instance or `undefined` if there is no player instance
 *          matching the argument.
 */
videojs.getPlayer = id => {
  const players = Player.players;
  let tag;
  if (typeof id === 'string') {
    const nId = normalizeId(id);
    const player = players[nId];
    if (player) {
      return player;
    }
    tag = $('#' + nId);
  } else {
    tag = id;
  }
  if (isEl(tag)) {
    const {
      player,
      playerId
    } = tag;

    // Element may have a `player` property referring to an already created
    // player instance. If so, return that.
    if (player || players[playerId]) {
      return player || players[playerId];
    }
  }
};

/**
 * Returns an array of all current players.
 *
 * @return {Array}
 *         An array of all players. The array will be in the order that
 *         `Object.keys` provides, which could potentially vary between
 *         JavaScript engines.
 *
 */
videojs.getAllPlayers = () =>
// Disposed players leave a key with a `null` value, so we need to make sure
// we filter those out.
Object.keys(Player.players).map(k => Player.players[k]).filter(Boolean);
videojs.players = Player.players;
videojs.getComponent = Component.getComponent;

/**
 * Register a component so it can referred to by name. Used when adding to other
 * components, either through addChild `component.addChild('myComponent')` or through
 * default children options  `{ children: ['myComponent'] }`.
 *
 * > NOTE: You could also just initialize the component before adding.
 * `component.addChild(new MyComponent());`
 *
 * @param {string} name
 *        The class name of the component
 *
 * @param {Component} comp
 *        The component class
 *
 * @return {Component}
 *         The newly registered component
 */
videojs.registerComponent = (name, comp) => {
  if (Tech.isTech(comp)) {
    log.warn(`The ${name} tech was registered as a component. It should instead be registered using videojs.registerTech(name, tech)`);
  }
  Component.registerComponent.call(Component, name, comp);
};
videojs.getTech = Tech.getTech;
videojs.registerTech = Tech.registerTech;
videojs.use = use;

/**
 * An object that can be returned by a middleware to signify
 * that the middleware is being terminated.
 *
 * @type {object}
 * @property {object} middleware.TERMINATOR
 */
Object.defineProperty(videojs, 'middleware', {
  value: {},
  writeable: false,
  enumerable: true
});
Object.defineProperty(videojs.middleware, 'TERMINATOR', {
  value: TERMINATOR,
  writeable: false,
  enumerable: true
});

/**
 * A reference to the {@link module:browser|browser utility module} as an object.
 *
 * @type {Object}
 * @see  {@link module:browser|browser}
 */
videojs.browser = browser;

/**
 * A reference to the {@link module:obj|obj utility module} as an object.
 *
 * @type {Object}
 * @see  {@link module:obj|obj}
 */
videojs.obj = Obj;

/**
 * Deprecated reference to the {@link module:obj.merge|merge function}
 *
 * @type {Function}
 * @see {@link module:obj.merge|merge}
 * @deprecated Deprecated and will be removed in 9.0. Please use videojs.obj.merge instead.
 */
videojs.mergeOptions = deprecateForMajor(9, 'videojs.mergeOptions', 'videojs.obj.merge', merge);

/**
 * Deprecated reference to the {@link module:obj.defineLazyProperty|defineLazyProperty function}
 *
 * @type {Function}
 * @see {@link module:obj.defineLazyProperty|defineLazyProperty}
 * @deprecated Deprecated and will be removed in 9.0. Please use videojs.obj.defineLazyProperty instead.
 */
videojs.defineLazyProperty = deprecateForMajor(9, 'videojs.defineLazyProperty', 'videojs.obj.defineLazyProperty', defineLazyProperty);

/**
 * Deprecated reference to the {@link module:fn.bind_|fn.bind_ function}
 *
 * @type {Function}
 * @see {@link module:fn.bind_|fn.bind_}
 * @deprecated Deprecated and will be removed in 9.0. Please use native Function.prototype.bind instead.
 */
videojs.bind = deprecateForMajor(9, 'videojs.bind', 'native Function.prototype.bind', bind_);
videojs.registerPlugin = Plugin.registerPlugin;
videojs.deregisterPlugin = Plugin.deregisterPlugin;

/**
 * Deprecated method to register a plugin with Video.js
 *
 * @deprecated Deprecated and will be removed in 9.0. Use videojs.registerPlugin() instead.
 *
 * @param {string} name
 *        The plugin name
 *
 * @param {Plugin|Function} plugin
 *         The plugin sub-class or function
 */
videojs.plugin = (name, plugin) => {
  log.warn('videojs.plugin() is deprecated; use videojs.registerPlugin() instead');
  return Plugin.registerPlugin(name, plugin);
};
videojs.getPlugins = Plugin.getPlugins;
videojs.getPlugin = Plugin.getPlugin;
videojs.getPluginVersion = Plugin.getPluginVersion;

/**
 * Adding languages so that they're available to all players.
 * Example: `videojs.addLanguage('es', { 'Hello': 'Hola' });`
 *
 * @param {string} code
 *        The language code or dictionary property
 *
 * @param {Object} data
 *        The data values to be translated
 *
 * @return {Object}
 *         The resulting language dictionary object
 */
videojs.addLanguage = function (code, data) {
  code = ('' + code).toLowerCase();
  videojs.options.languages = merge(videojs.options.languages, {
    [code]: data
  });
  return videojs.options.languages[code];
};

/**
 * A reference to the {@link module:log|log utility module} as an object.
 *
 * @type {Function}
 * @see  {@link module:log|log}
 */
videojs.log = log;
videojs.createLogger = createLogger;

/**
 * A reference to the {@link module:time|time utility module} as an object.
 *
 * @type {Object}
 * @see {@link module:time|time}
 */
videojs.time = Time;

/**
 * Deprecated reference to the {@link module:time.createTimeRanges|createTimeRanges function}
 *
 * @type {Function}
 * @see {@link module:time.createTimeRanges|createTimeRanges}
 * @deprecated Deprecated and will be removed in 9.0. Please use videojs.time.createTimeRanges instead.
 */
videojs.createTimeRange = deprecateForMajor(9, 'videojs.createTimeRange', 'videojs.time.createTimeRanges', createTimeRanges);

/**
 * Deprecated reference to the {@link module:time.createTimeRanges|createTimeRanges function}
 *
 * @type {Function}
 * @see {@link module:time.createTimeRanges|createTimeRanges}
 * @deprecated Deprecated and will be removed in 9.0. Please use videojs.time.createTimeRanges instead.
 */
videojs.createTimeRanges = deprecateForMajor(9, 'videojs.createTimeRanges', 'videojs.time.createTimeRanges', createTimeRanges);

/**
 * Deprecated reference to the {@link module:time.formatTime|formatTime function}
 *
 * @type {Function}
 * @see {@link module:time.formatTime|formatTime}
 * @deprecated Deprecated and will be removed in 9.0. Please use videojs.time.format instead.
 */
videojs.formatTime = deprecateForMajor(9, 'videojs.formatTime', 'videojs.time.formatTime', formatTime);

/**
 * Deprecated reference to the {@link module:time.setFormatTime|setFormatTime function}
 *
 * @type {Function}
 * @see {@link module:time.setFormatTime|setFormatTime}
 * @deprecated Deprecated and will be removed in 9.0. Please use videojs.time.setFormat instead.
 */
videojs.setFormatTime = deprecateForMajor(9, 'videojs.setFormatTime', 'videojs.time.setFormatTime', setFormatTime);

/**
 * Deprecated reference to the {@link module:time.resetFormatTime|resetFormatTime function}
 *
 * @type {Function}
 * @see {@link module:time.resetFormatTime|resetFormatTime}
 * @deprecated Deprecated and will be removed in 9.0. Please use videojs.time.resetFormat instead.
 */
videojs.resetFormatTime = deprecateForMajor(9, 'videojs.resetFormatTime', 'videojs.time.resetFormatTime', resetFormatTime);

/**
 * Deprecated reference to the {@link module:url.parseUrl|Url.parseUrl function}
 *
 * @type {Function}
 * @see {@link module:url.parseUrl|parseUrl}
 * @deprecated Deprecated and will be removed in 9.0. Please use videojs.url.parseUrl instead.
 */
videojs.parseUrl = deprecateForMajor(9, 'videojs.parseUrl', 'videojs.url.parseUrl', parseUrl);

/**
 * Deprecated reference to the {@link module:url.isCrossOrigin|Url.isCrossOrigin function}
 *
 * @type {Function}
 * @see {@link module:url.isCrossOrigin|isCrossOrigin}
 * @deprecated Deprecated and will be removed in 9.0. Please use videojs.url.isCrossOrigin instead.
 */
videojs.isCrossOrigin = deprecateForMajor(9, 'videojs.isCrossOrigin', 'videojs.url.isCrossOrigin', isCrossOrigin);
videojs.EventTarget = EventTarget;
videojs.any = any;
videojs.on = on;
videojs.one = one;
videojs.off = off;
videojs.trigger = trigger;

/**
 * A cross-browser XMLHttpRequest wrapper.
 *
 * @function
 * @param    {Object} options
 *           Settings for the request.
 *
 * @return   {XMLHttpRequest|XDomainRequest}
 *           The request object.
 *
 * @see      https://github.com/Raynos/xhr
 */
videojs.xhr = XHR;
videojs.TextTrack = TextTrack;
videojs.AudioTrack = AudioTrack;
videojs.VideoTrack = VideoTrack;
['isEl', 'isTextNode', 'createEl', 'hasClass', 'addClass', 'removeClass', 'toggleClass', 'setAttributes', 'getAttributes', 'emptyEl', 'appendContent', 'insertContent'].forEach(k => {
  videojs[k] = function () {
    log.warn(`videojs.${k}() is deprecated; use videojs.dom.${k}() instead`);
    return Dom[k].apply(null, arguments);
  };
});
videojs.computedStyle = deprecateForMajor(9, 'videojs.computedStyle', 'videojs.dom.computedStyle', computedStyle);

/**
 * A reference to the {@link module:dom|DOM utility module} as an object.
 *
 * @type {Object}
 * @see {@link module:dom|dom}
 */
videojs.dom = Dom;

/**
 * A reference to the {@link module:fn|fn utility module} as an object.
 *
 * @type {Object}
 * @see {@link module:fn|fn}
 */
videojs.fn = Fn;

/**
 * A reference to the {@link module:num|num utility module} as an object.
 *
 * @type {Object}
 * @see {@link module:num|num}
 */
videojs.num = Num;

/**
 * A reference to the {@link module:str|str utility module} as an object.
 *
 * @type {Object}
 * @see {@link module:str|str}
 */
videojs.str = Str;

/**
 * A reference to the {@link module:url|URL utility module} as an object.
 *
 * @type {Object}
 * @see {@link module:url|url}
 */
videojs.url = Url;

export { videojs as default };