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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var frameRoot = document.getElementById("f").contentDocument.documentElement;
var marquee = frameRoot.getElementsByTagName("marquee")[0];
marquee.__proto__ = [];
frameRoot.appendChild(marquee);
}
</script>
</head>
<body onload="boom();">
<iframe id="f" src="data:application/xhtml+xml,<html xmlns='http://www.w3.org/1999/xhtml'><body><marquee></marquee></body></html>"></iframe>
</body>
</html>