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Test Info:

<!DOCTYPE html>
<script>
function boom()
{
document.documentElement.removeChild(document.body);
var newBody = document.createElementNS("http://www.w3.org/1999/xhtml", "body");
document.documentElement.appendChild(newBody);
newBody.contentEditable = "true";
document.execCommand("inserthtml", false, "<textarea>a</textarea>");
document.execCommand("insertimage", false, "1.jpg");
try { document.execCommand("forwardDelete", false, null); } catch(e) { }
document.execCommand("inserthtml", false, "x<span><\/span>y");
}
</script>
<body onload="boom();"></body>