<details id="details" open>hi<video width=480 height=320></details>
<script>
details.focus();
details.open = false;
window.onclick = () => {
    details.open = true;
}
if (window.testRunner && window.eventSender) {
    testRunner.dumpAsText();
    eventSender.mouseMoveTo(innerWidth / 2, innerHeight / 2);
    eventSender.mouseDown();
    eventSender.mouseUp();
}
</script>