<!DOCTYPE html>
<html>
<script>
function boom()
{
var a = document.createElementNS("http://www.w3.org/1999/xhtml", "span");
var b = document.createElementNS("http://www.w3.org/1999/xhtml", "span");
var x = document.createElementNS("http://www.w3.org/1999/xhtml", "div");
var y = document.createElementNS("http://www.w3.org/1999/xhtml", "basefont");
var z = document.createElementNS("http://www.w3.org/1999/xhtml", "body");
z.setAttributeNS(null, "link", "#333333");
document.documentElement.appendChild(a);
b.appendChild(x);
b.appendChild(y);
document.documentElement.offsetHeight;
a.appendChild(b);
document.documentElement.offsetHeight;
document.createElementNS("http://www.w3.org/1999/xhtml", "div").appendChild(y);
b.appendChild(z);
}
</script>
<body onload="boom();"></body>