<script>
(async () => {
 testRunner.dumpAsText();
 internals.withUserGesture(() => {});
 n1 = document.createElement('video');
 document.documentElement.append(n1);
 n2 = document.createElement('source');
 n1.after(n2);
 n14 = document.createElement('div');
 n2.append(n14);
 n18 = document.createElement('div');
 n2.after(n18);
 n46 = document.createElement('source');
 n1.after(n46);
 n59 = document.createElement('audio');
 n59.src = 'data:application/vnd.apple.mpegURL;base64,x';
 try {
 await n2.requestFullscreen();
 navigator.mediaSession.callActionHandler({ action: 'seekbackward', });
 await new Promise(requestAnimationFrame);
 await new Promise(requestAnimationFrame);
 await n18.requestFullscreen();
 } catch { }
})();
 </script>
This test passes if it doesn't crash.