title: What is the usage of comment notations in style tag?
body: <p>For example :</p>
  
  <pre><code>&lt;style type="text/css"&gt;
      &lt;!--
      #map{ width:500px;height:500px;float:left }
      --&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>What is the usage of <code>&lt;!-- --&gt;</code> ?</p>