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>
<title>Bug 1007278: check disabled and non-disabled buttons look different</title>
</head>
<body>
  <input type="button" value="Some text">
</body>
</html>