<!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>
