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Test Info:

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function boom()
{
window.addEventListener("DOMSubtreeModified", function(){});
var ms = document.createElementNS(MATHML_NS, "ms");
document.body.appendChild(ms);
}
</script>
</head>
<body onload="boom();"></body>
</html>