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Test Info:

<html><head><script type="text/javascript">
function boom()
{
var dE = document.documentElement;
var head = document.getElementsByTagName("head")[0];
dE.removeChild(document.body);
dE.contentEditable = "true";
dE.focus();
dE.contentEditable = "false";
head.focus();
head.contentEditable = "true";
try {
document.execCommand("selectAll", false, "");
} catch(e) {
}
}
</script></head><body onload="boom();"></body></html>