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.

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<!DOCTYPE HTML>
<title>iframe for test_visited_pref.html</title>
<style>
:link { color: blue }
:visited { color: purple }
</style>
<a href="http://www.example.com/url-that-has-not-been-visited" id="link">link</a>