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Test Info:

<html xmlns="http://www.w3.org/1999/xhtml"><head><script>
<![CDATA[
function boom()
{
document.execCommand("selectAll", false, null);
document.execCommand("selectAll", false, null);
document.execCommand("inserthtml", false, "<span><div>");
var textarea = document.getElementById("textarea");
var span = document.createElementNS("http://www.w3.org/1999/xhtml", "span");
textarea.appendChild(span);
}
]]>
</script></head><div contenteditable="true"></div><body onload="boom();"><textarea id="textarea">f</textarea></body></html>