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chromium/third_party/blink/web_tests/external/wpt/mathml/presentation-markup/tables/dynamic-rowspan-mozilla-370692-ref.xhtml 

<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<table>
  <mathml:mtr xmlns:mathml="http://www.w3.org/1998/Math/MathML">
    <mathml:mo>+</mathml:mo>
    <td>bar</td>
  </mathml:mtr>
  <tr><td>baz</td></tr>
</table>
</body>

</html>