chromium/third_party/blink/web_tests/css3/selectors3/xml/css3-modsel-174b.xml

<?xml-stylesheet href="css3-modsel-174b.css" type="text/css"?>
<test>
  <tests xmlns="http://css.example.net/" xmlns:test="http://css.example.net/">
   <testA attribute="pass" test:attribute="fail">This should be green.</testA>
   <testB attribute="fail" test:attribute="pass">This should be green.</testB>
  </tests>
</test>