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Test Info: Warnings

<!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>