<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
 <head class="before">
  <title>CSS Test: CSS: Changing the background of the BODY element by changing a sibling's class</title>
  <link rel="author" title="Ian Hickson" href="mailto:ian@hixie.ch">
  <link rel="alternate" href="http://www.hixie.ch/tests/adhoc/css/background/dynamic/001.html" type="text/html">
  <meta name="flags" content="dom">
  <link rel="help" href="http://www.w3.org/TR/CSS21/colors.html#background">
  <link rel="match" href="reference/background-root-101-ref.htm">

  <style type="text/css">
    head.before + body { background: red; color: yellow; }
    head.after + body { background: green; color: white; }
    p.after { font-weight: bold; }
  </style>
  <script type="text/javascript">
    function test() {
      document.getElementsByTagName('head')[0].className = 'after';
      document.getElementsByTagName('p')[0].className = 'after';
    }
  </script>
 </head>
 <body onload="setTimeout(test, 5)">
  <p class="before">This page should be green (and this text should be bold -- if it isn't bold, something went wrong with the script part of the test).</p>
 </body>
</html>