he "id" attributes must be unique.</p>
         </section>
         <pre xml:space="preserve">&lt;form action="http://example.com/vote" method="post"&gt;
  &lt;fieldset&gt;
    &lt;legend&gt;Your preferred philosopher&lt;/legend&gt;
    &lt;input type="radio" name="philosopher" id="philosopher_socrates" value="socrates"/&gt;
    &lt;label for="philosopher_socrates"&gt;Socrates&lt;/label&gt;
    &lt;input type="radio" name="philosopher" id="philosopher_plato" value="plato"/&gt;
    &lt;label for="philosopher