title: How to add CSS if element has more than one child?
body: <p>I have <code>td</code> tags and a several <code>div</code> inside <code>td</code>:</p>
  
  <pre><code>&lt;td&gt;
     &lt;div class='test'&gt;&lt;/div&gt;
     &lt;div class='test'&gt;&lt;/div&gt;
  &lt;/td&gt;
  
  &lt;td&gt;
     &lt;div class='test'&gt;&lt;/div&gt;  
  &lt;/td&gt;
  </code></pre>
  
  <p>I want to add <code>margin-bottom</code> to <code>div</code> if there are more than one in the <code>td</code>. How can I do this with the css?</p>