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<!DOCTYPE html>
<html>
<head>
<style>
video {
width: 480px;
height: 320px;
position: absolute;
}
.offscreen {
top: -320px;
}
</style>
<script>
function moveVideoOffscreen() {
document.querySelector("video").classList.add("offscreen");
setTimeout(function() {
try {
window.webkit.messageHandlers.testHandler.postMessage("moved");
} catch(e) {
}
}, 0);
}
</script>
</head>
<body>
<video autoplay onplaying=moveVideoOffscreen()><source src="large-video-with-audio.mp4"></video>
</body>
<html>
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