<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
 <head>
  <title>CSS 2.1 Test Suite: At-rules</title>
  <link rel="help" href="http://www.w3.org/TR/CSS21/syndata.html#at-rules">
  <style type="text/css">

  # { background: red; }
  :unknownpseudo { background: red; }
  @import "support/import-green.css";

  </style>
 </head>
 <body>
  <p class="import">This sentence must be green.</p>
 </body>
</html>