chromium/third_party/blink/web_tests/css3/selectors3/xml/css3-modsel-19.xml

<?xml-stylesheet href="css3-modsel-19.css" type="text/css"?>
<test>
<p xmlns="http://www.w3.org/1999/xhtml">The background color of <a href="#foo">the anchor</a>
   should turn to green when it is activated and come back to
   normal when it is released.</p>
</test>