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<script>
function boom()
{
document.getElementById("xxx").style.position = "fixed";
document.documentElement.removeAttribute("class");
}
window.addEventListener("load", function(){setTimeout(boom, 30)}, 0);
</script>
<hbox id="xxx" style="position: absolute; display: block;">
<label value="X" />
<menulist>
<menupopup>
<menuitem label="Y" />
</menupopup>
</menulist>
</hbox>
</window>