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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var b = document.body;
b.contentEditable = "true";
document.execCommand("contentReadOnly", false, null);
b.focus();
b.contentEditable = "false";
document.documentElement.contentEditable = "true";
document.createDocumentFragment().appendChild(b);
document.documentElement.focus();
}
</script>
</head>
<body onload="boom();"></body>
</html>