<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var hbox = document.createElementNS("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul", "hbox");
document.removeChild(document.documentElement);
document.appendChild(hbox);
}
</script>
</head>
<body onload="boom();"></body>
</html>