author Dorel Luca <>
Sat, 12 Jan 2019 01:28:30 +0200
changeset 453595 c45da646fc6140bd59a36bda18f6cecde6163feb
parent 315197 d82676c65f7a06c8c1ce457672d2b789566c120b
child 469641 ba6f655fd68963530c866d0d4a48c3db3d307777
permissions -rw-r--r--
Backed out changeset 24243f13c895 (bug 1519308) for build bustage in mozbuild/mozbuild/test/configure/ CLOSED TREE

  <meta charset="utf-8">
  <title>Media test: TextTrackList change event</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<p id="display"></p>
<div id="content">
<pre id="test">
<script class="testbody" type="text/javascript">

video = document.createElement("video");

isnot(video.textTracks, null, "Video should have a list of TextTracks.");

video.addTextTrack("subtitles", "", "");

track = video.textTracks[0];
video.textTracks.addEventListener("change", changed);

is(track.mode, "hidden", "New TextTrack's mode should be hidden.");
track.mode = "showing";
// Bug882674: change the mode again to see if we receive only one
// change event.
track.mode = "hidden";

var eventCount = 0;
function changed(event) {
  is(eventCount, 1, "change event dispatched multiple times.");
  is(, video.textTracks, "change event's target should be video.textTracks.");
  ok(event instanceof window.Event, "change event should be a simple event.");
  ok(!event.bubbles, "change event should not bubble.");
  ok(event.isTrusted, "change event should be trusted.");
  ok(!event.cancelable, "change event should not be cancelable.");

  // Delay the finish function call for testing the change event count.
  setTimeout(SimpleTest.finish, 0);