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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>fractions linethickness</title>
</head>
<body>
<p>This test passes if you see a fraction without fraction bar.</p>
<math>
<mfrac>
<mspace width="20px" height="5px" style="background: blue"></mspace>
<mspace width="20px" height="5px" style="background: cyan"></mspace>
</mfrac>
</math>
</body>
</html>