video.html - mozsearch

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /layout-instability/video.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Layout Instability: no shifts from advancing video track</title>

<link rel="help" href="https://wicg.github.io/layout-instability/" />

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

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

<script src="resources/test-adapter.js"></script>

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

<video controls>

  <source src="/media/white.webm" type="video/webm">

</video>

<script>

promise_test(async () => {

  const watcher = new ScoreWatcher;

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

  await new Promise(resolve => { video.oncanplay = resolve; });

  await waitForAnimationFrames(2);

  // TODO(crbug.com/1088311): There are still some shifts from creating the

  // <video>, so the score is already > 0 here. For now, just verify that

  // advancing the track does not increase it further.

  var currentScore = watcher.score;

  video.currentTime = 5;

  await waitForAnimationFrames(3);

  cls_expect(watcher, {score: currentScore});

}, "No shifts from advancing video track.");

</script>