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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>mfrac with three children</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#mfrac">
<meta name="assert" content="An mfrac with no children should render using an empty mrow.">
<link rel="match" href="frac-invalid-3-ref.html">
</head>
<body>
<p>This test passes if you see a single rectangle.</p>
<math>
<mfrac>
<mspace width="50px" height="200px" style="background: green"></mspace>
<mspace width="50px" height="200px" style="background: green"></mspace>
<mspace width="100px" height="200px" style="background: green"></mspace>
</mfrac>
</math>
</body>
</html>