<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>CSS: 1 simple tests of a universal :not()</title>
  <style type="text/css">
    @namespace url(http://www.w3.org/1999/xhtml);
    *|* { color: red; display: block; margin: 0; padding: 0; }
    head { display: none; }
    *|*:not(*) { color: green; }
  </style>
 </head>
 <body>
  <tests xmlns="http://www.example.org/">
    This should be green.    
  </tests>
 </body>
</html>
