 rel="up" href="./index.html">
  <link rel="top" href="../../index.html">
 </head>
 <body>
<p id="first">This paragraph should be unstyled.
       The background of the following paragraph should become green when
       you follow <a href="#second">this link</a>.</p>
<p id="second">This paragraph should initially be unstyled.
       It should become green when you select the link above. When you select
       <a href="#third">this link</a>, it should return to being unstyled and the 
       background of t