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chromium/third_party/blink/web_tests/external/wpt/css/selectors/xml-class-selector-ref.xml 

<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
  <title>Class selectors in an XML namespace</title>
  <link rel="author" href="mailto:[email protected]" />
  <body>
    <p>The .class selector should work in any namespace. Both boxes should be green.</p>
    <Boxes xmlns="http://foo">
      <box>.classname selector</box>
      <box>*[class~="classname"] selector</box>
    </Boxes>

    <style>
      box {background:green;}
    </style>
  </body>
</html>