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Test Info:

<!DOCTYPE html>
<html>
<head>
<title>mphantom</title>
<meta charset="utf-8"/>
</head>
<body>
<!-- Test different kinds of content inside <mphantom>. -->
<p><math>
<mrow style="visibility: hidden">
<msqrt>
<mfrac>
<mn>1</mn>
<mi>x</mi>
</mfrac>
</msqrt>
<mo>+</mo>
<menclose notation="box updiagonalstrike">
<mover>
<mspace width="3em" height="1em" mathbackground="red"/>
<mo>‾</mo>
</mover>
</menclose>
</mrow>
</math></p>
</body>
</html>