chromium/third_party/blink/web_tests/css3/selectors3/xml/css3-modsel-25.xml

<?xml-stylesheet href="css3-modsel-25.css" type="text/css"?>
<test>
<p xmlns="http://www.w3.org/1999/xhtml">
<input type="checkbox" checked="checked"></input> <span>Everything in this paragraph should have a green background</span></p>
</test>