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>
  <!-- Test placeholder behavior when textarea is too small -->
  <link rel='stylesheet' type='text/css' href='placeholder-style.css'>
    <textarea cols="5" rows="3" placeholder="my placeholder"></textarea>