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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var f = document.getElementById("f");
var fw = f.contentWindow;
fw.document.designMode = 'on';
f.style.content = "'m'";
fw.document.removeChild(fw.document.documentElement)
}
</script>
</head>
<body onload="boom();"><iframe id="f" src="data:text/html,"></iframe></body>
</html>