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chromium/third_party/blink/web_tests/external/wpt/mathml/crashtests/mozilla/347495-1.xhtml 

<html xmlns="http://www.w3.org/1999/xhtml">
<body>

<div><math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <munderover>
    <mo>&#x0220F;</mo>
    <mn>1</mn>
  </munderover>
</math></div>

</body>

</html>