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chromium/third_party/blink/web_tests/external/wpt/mathml/presentation-markup/fractions/frac-linethickness-006-ref.html 

<!DOCTYPE html>
<html>
  <head>
    <title>mfrac linethickness</title>
  </head>
  <body>
    <math>
      <mfrac style="font-size: 300%">
        <mi>a</mi>
        <mi>b</mi>
      </mfrac>
    </math>
  </body>
</html>