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<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=882703
-->
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  <meta charset="utf-8">
  <title>Media test: TextTrackList change event</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
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<p id="display"></p>
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<pre id="test">
<script class="testbody" type="text/javascript">
SimpleTest.waitForExplicitFinish();

let video = document.createElement("video");

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

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

let 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) {
  eventCount++;
  is(eventCount, 1, "change event dispatched multiple times.");
  is(event.target, 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);
}
</script>
</pre>
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