DXR will be turned off on Tuesday, December 29th. It will redirect to Searchfox.
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.

Line Code
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<!DOCTYPE html>
    <title>mfrac denomalign</title>
    <div style="position: absolute;">
      <math xmlns="http://www.w3.org/1998/Math/MathML">
        <mfrac denomalign="right" linethickness="0">
          <mspace width="100px" height="20px" mathbackground="red"></mspace>
          <mspace width="50px" height="20px" mathbackground="red"></mspace>