chromium/third_party/blink/web_tests/external/wpt/picture-in-picture/exit-picture-in-picture.html

<!DOCTYPE html>
<title>Test exit Picture-in-Picture</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();
  return requestPictureInPictureWithTrustedClick(video)
  .then(() => document.exitPictureInPicture());
}, 'Exit Picture-in-Picture resolves when there is a Picture-in-Picture video');

promise_test(t => {
  return promise_rejects_dom(t, 'InvalidStateError',
      document.exitPictureInPicture());
}, 'Exit Picture-in-Picture rejects when there is no Picture-in-Picture video');
</script>