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Test Info:

<head>
<style type="text/css">
mover { font-size: 326590449211mm; }
</style>
<script type="text/javascript">
function boom()
{
document.getElementById("r").setAttribute("accentunder", "4");
}
</script>
</head>
<body onload="boom();">
<mover xmlns="http://www.w3.org/1998/Math/MathML" id="mover"><munderover id="r"><merror/><msqrt/></munderover></mover>
</body>
</html>