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Test Info:

<html xmlns="http://www.w3.org/1999/xhtml"><mtr xmlns="http://www.w3.org/1998/Math/MathML"><td id="cell" xmlns="http://www.w3.org/1999/xhtml"></td></mtr><script>
function boom()
{
document.getElementById("cell").contentEditable = true;
document.getElementById("cell").focus();
document.execCommand("inserthtml", false, "x");
}
window.addEventListener("load", boom, false);
</script></html>