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Test Info:

<html>
<head>
<script type="text/javascript">
function boom()
{
var r = document.documentElement;
while (r.firstChild)
r.firstChild.remove();
var b = document.createElement("BODY");
var s = document.createElement("SCRIPT");
var f1 = document.createElement("FORM");
var i = document.createElement("INPUT");
var br = document.createElement("BR");
var f2 = document.createElement("FORM");
var span = document.createElement("SPAN");
f1.appendChild(i);
f1.appendChild(br);
s.appendChild(f1);
b.appendChild(s);
f2.appendChild(span);
b.appendChild(f2)
document.documentElement.appendChild(b);
b.contentEditable = "true";
document.execCommand("indent", false, null);
b.contentEditable = "false";
span.appendChild(i);
i.remove();
}
</script>
</head>
<body onload="boom();">
</body>
</html>