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<!DOCTYPE html>
<html>
<head>
<title>iframe</title>
<script>
function onMsg(e) {
if(e.data instanceof MediaStreamTrack) {
parent.postMessage({result: 'Success'});
} else {
parent.postMessage({
result: 'Failure',
error: `${e.data} is not a MediaStreamTrack`
});
}
}
window.addEventListener("message", onMsg);
</script>
</head>
<body>
</body>
</html>