title: What <!--[if IE 6]> <![endif]--> does in ASP.Net's asp file?
body: <p>I saw a piece of code like this:  </p>
  
  <pre><code>&lt;!--[if IE 6]&gt;
  &lt;script type="text/javascript"&gt;
      function pageLoad() {
          //$find('mpeIeWarning').show();
          document.getElementById('divIE6').style.display = "";
  
      }
  &lt;/script&gt;
  &lt;![endif]--&gt;
  </code></pre>
  
  <p>Is </p>
  
  <pre><code>&lt;!--[if IE 6]&gt; 
  
  &lt;![endif]--&gt;
  </code></pre>
  
  <p>a comment tag? or doing something special, to be honest, I never used this thing. </p>