track-cues-cuechange-dynamically-created-track-element.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/media-elements/track/track-element/track-cues-cuechange-dynamically-created-track-element.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>'cuechange' event on dynamically created track element</title>

<meta name="timeout" content="long">

<script src="/common/media.js"></script>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<video>

<script>

/**

 * 'cuechange' event should be correctly dispatched on the dynamically created

 * track element.

*/

promise_test(function(t) {

  const video = document.querySelector("video");

  const track = document.createElement("track");

  track.src = "resources/cues-chrono-order.vtt";

  track.track.mode = "hidden";

  video.appendChild(track);

  const cueChangedPromise = new Promise(r => track.oncuechange = r);

  video.src = getVideoURI("/media/test");

  // 'TimeMarchesOn' algorithm will be run after calling 'play()', from which

  // the 'cuechange' event would be dispatched.

  video.play();

  return cueChangedPromise;

});

</script>

</video>