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>
     <meta charset="utf-8"/>
      <munderover accentunder="true"><mtext>X</mtext><mo>O</mo><mo>O</mo></munderover>