title: "& did not start a character reference. (& probably should have been escaped as &amp;.)" w3c markup
body: <p>I'm using w3c markup validator. I get this error:   </p>
  
  <pre><code>Line 169, Column 60: &amp; did not start a character reference. (&amp; probably should have been escaped as &amp;amp;.)
      &lt;a href="index.php?option=com_content&amp;view=article&amp;id=6&amp;Itemid=4"&gt;
  </code></pre>
  
  <p>If I use &amp;amp instead of &amp;, I can't pass values to next page. 
  Someone please help me. Thanks in advance</p>