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Test Info:

<head>
<script type="text/javascript">
<![CDATA[
function boom()
{
document.body.setAttribute("contenteditable", "true");
document.execCommand("selectAll", false, null);
document.execCommand("inserthtml", false, "<span><div><\/div><\/span>");
document.execCommand("undo", false, null);
}
]]>
</script>
</head>
<body onload="boom();"><textarea><span/></textarea></body>
</html>