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chromium/third_party/blink/web_tests/external/wpt/mathml/crashtests/mozilla/323738-1.xml 

<html xmlns="http://www.w3.org/1999/xhtml">
  <div>
    <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline">
          <msub>
            <mo>
              <factorial />
            </mo>
          </msub>
    </math>
  </div>
</html>