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Test Info:

<head>
<script>
function boom()
{
document.documentElement.style.fontStyle = "oblique";
var c = document.getElementById("c");
c.parentNode.removeChild(c);
}
</script>
</head>
<body onload="boom();"><math xmlns="http://www.w3.org/1998/Math/MathML"><frameset xmlns="http://www.w3.org/1999/xhtml"></frameset><msubsup id="c"/><mo><frameset xmlns="http://www.w3.org/1999/xhtml"></frameset></mo></math>x</body>
</html>