title: div#someid vs only #someid?
body: <p>What is the difference in using </p>
  
  <pre><code>#mb &gt; a 
  </code></pre>
  
  <p>vs</p>
  
  <pre><code>div#mb &gt; a 
  </code></pre>
  
  <p>in the code below?  It seems to be produce the same result.</p>
  
  <pre><code>    &lt;style&gt;
      #mb &gt; a {
      background:#333;
      padding:10px 20px;
      color:#999;
      margin-right:10px;
      text-decoration:none;
      &lt;/style&gt;
  
  
  &lt;div id="mb"&gt;
      &lt;a href="#"&gt;Link1&lt;/a&gt;&lt;a href="#"&gt;Link2&lt;/a&gt;&lt;a href="#"&gt;Link3&lt;/a&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p><a href="http://jsfiddle.net/58mkz/" rel="nofollow">http://jsfiddle.net/58mkz/</a> --without div reference</p>
  
  <p><a href="http://jsfiddle.net/aZrPy/" rel="nofollow">http://jsfiddle.net/aZrPy/</a> --with div reference</p>