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

<!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>

chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/track/track-element/track-cues-cuechange-dynamically-created-track-element.html