<!DOCTYPE html>
<html>
<head>
<title>Video Player Test</title>
<meta name=viewport content='width=device-width initial-scale=1.0'>
</head>
<body>
<video controls id=video src=bear.webm controlsList='noplaybackrate noremoteplayback' disablePictureInPicture></video>
<button id='fullscreen'>fullscreen</button>
</body>
<script>
document.querySelector('#fullscreen').addEventListener('click', _ => {
document.querySelector('video').webkitRequestFullscreen();
}, { once: true });
</script>
</html>