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Test Info:

<xul:deck id="d"/>
<xul:menuitem><span /><xul:menupopup id="p"/></xul:menuitem>
<script>
function boom()
{
var p = document.getElementById("p");
var d = document.getElementById("d");
p.parentNode.removeChild(p);
d.appendChild(document.createElementNS("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul", "box"));
}
window.addEventListener("load", boom, false);
</script>
</html>