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>
<!-- Any copyright is dedicated to the Public Domain.
   - http://creativecommons.org/publicdomain/zero/1.0/ -->

<html>
  <style>
  summary {
    display: inline; /* ::first-line appiles only to inline element. */
  }

  details::first-line {
    color: blue;
  }
  </style>
  <body>
    <details>
      <summary>Summary
        <!-- Need ib-split so that the summary has multiple frames. -->
        <div>Block in summary</div>
      </summary>
      <p>This is the details.</p>
    </details>
  </body>
</html>