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<!DOCTYPE html>
<html>
<head>
<title>mfrac bevelled</title>
</head>
<body>
<math>
<mfrac style="font-size: 300%">
<mspace width="20px" height="20px" mathbackground="red"></mspace>
<mspace width="20px" height="20px" mathbackground="red"></mspace>
</mfrac>
</math>
</body>
</html>