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See the announcement on Discourse.

DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (b6d82b1a6b02)

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<!DOCTYPE html>
<html>
  <head>
    <title>mfrac linethickness</title>
  </head>
  <body>
    <math xmlns="http://www.w3.org/1998/Math/MathML">
      <mfrac>
        <mi>a</mi>
        <mi>b</mi>
      </mfrac>
      <mo>=</mo>
      <mfrac>
        <mi>a</mi>
        <mi>b</mi>
      </mfrac>
      <mo>=</mo>
      <mfrac linethickness="1">
        <mi>a</mi>
        <mi>b</mi>
      </mfrac>
    </math>
  </body>
</html>