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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
function f() {
document.removeEventListener("DOMSubtreeModified", f, true);
document.documentElement.setAttributeNS(null, "contenteditable", "false");
}
document.addEventListener("DOMSubtreeModified", f, true);
document.documentElement.contentEditable = "true";
}
</script>
</head>
<body onload="boom();"></body>
</html>