display-mode.https.html

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<!DOCTYPE html>

<title>Test picture-in-picture display mode</title>

<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>

<body>

<script>

promise_test(async (t) => {

  await test_driver.bless('request PiP window');

  const pipWindow = await documentPictureInPicture.requestWindow();

  await new Promise(requestAnimationFrame);

  assert_true(!!pipWindow.matchMedia('(display-mode: picture-in-picture)'.matches));

});

</script>

</body>