he page.</p>
         </section>
         <pre xml:space="preserve">
...

   &lt;script type="text/javascript"&gt;
  function toggle(id){
    var n = document.getElementById(id);
    n.style.display =  (n.style.display != 'none' ? 'none' : '' );
  }
  &lt;/script&gt;

  ...

  &lt;button onclick="return toggle('toc');"&gt;Toggle Table of Contents&lt;/button&gt;
  &lt;div id="toc"&gt;
    ...
  &lt;/div&gt;

...
</pre>
         <section class="description"><h2>Description</h2>
            <p>Working example 