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chromium/third_party/blink/web_tests/external/wpt/picture-in-picture/removed-from-document.html 

<!DOCTYPE html>
<title>Test Picture-in-Picture when removed from document</title>
<script src="/common/media.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="resources/picture-in-picture-helpers.js"></script>
<body></body>
<script>
promise_test(async t => {
  const video = await loadVideo();
  document.body.appendChild(video);
  video.muted = true;
  await video.play();
  await requestPictureInPictureWithTrustedClick(video);

  assert_false(video.paused);
  document.body.offsetLeft;
  document.body.removeChild(video);
  await new Promise(resolve => step_timeout(resolve, 1000));
  assert_false(video.paused);
}, 'Picture-in-Picture video does not pause when removed from document');
</script>