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>
<html>
<head>
  <style>
    #checkbox {
       position: absolute;
       left: 0px;
       top: 0px;
       background: linear-gradient(to right, white, brown);
    }
  </style>
</head>
<body>
  <div id="checkbox">
    <input type="checkbox">
  </div>
</body>
</html>