 href="mailto:bzbarsky@mit.edu" />
    <link rel="author" title="Mozilla Corporation" href="http://mozilla.com/" />
    <link rel="help" href="http://www.w3.org/TR/CSS21/visuren.html#anonymous-block-level" />
    <meta name="flags" content="dom" />
    <style type="text/css">* { margin: 0; padding: 0 }
      #i { border: 2px solid; }
      #i:after { display: block; content: "Two"; }
    </style>
    <script type="text/javascript">
      function doTest() {
        var i = document.getElementById("i");
    