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Test Info:

<script>
<![CDATA[
function boom()
{
var d = document.createElementNS("http://www.w3.org/1999/xhtml", "div");
d.setAttributeNS(null, "contenteditable", "true");
var s = document.createElementNS("http://www.w3.org/1999/xhtml", "span");
d.appendChild(s);
document.documentElement.appendChild(d);
var textarea = document.createElementNS("http://www.w3.org/1999/xhtml", "textarea");
var t1 = document.createTextNode("A");
textarea.appendChild(t1);
var t2 = document.createTextNode("B");
textarea.appendChild(t2);
document.documentElement.appendChild(textarea);
document.documentElement.offsetHeight;
d.removeChild(s);
textarea.removeChild(t2);
document.documentElement.appendChild(document.createTextNode(" C "));
document.documentElement.appendChild(t2);
}
window.addEventListener("load", boom);
]]>
</script>
<!-- no body -->
</html>