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<!DOCTYPE html>
<video id="video" src="gizmo.mp4" loop></video>
<script type="text/javascript">
window.onmessage = async event => {
const video = document.getElementById("video");
const w = window.opener || window.parent;
if (event.data == "play") {
await video.play();
w.postMessage("played", "*");
}
}
</script>