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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
document.getElementById("s").appendChild(document.createElement("div"));
var marq = document.getElementById("f").contentDocument.documentElement;
marq.behavior = "alternate";
}
</script>
</head>
<body onload="boom();"><span id="s"></span><iframe src="data:text/xml,%3Cmarquee%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxhtml%22%3EX%3C%2Fmarquee%3E" id="f"></iframe></body>
</html>