<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" onload="setTimeout(boom, 30);" class="reftest-wait"> <script> function remove(q1) { q1.parentNode.removeChild(q1); } function boom() { var x = document.getElementById("x"); var y = document.getElementById("y"); remove(x); remove(y); document.documentElement.removeAttribute("class"); } </script> <tree> <treechildren id="y"/> <richlistbox> <hbox id="x"/> <menulist/> </richlistbox> </tree> </window>