<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>CSS Test reference</title>
  <link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/"/>
  <link rel="author" title="Florian Rivoal" href="https:/florian.rivoal.net"/>
  <style type="text/css">
    div {
      height: 2em;
      background: green;
    }
  </style>

 </head>
 <body>
  <p>There must be a green box below and no red.</p>
  <div></div>
 </body>
</html>