title: What does this operator (::) in CSS mean?
body: <p>I have seen CSS like <a href="http://css-tricks.com/custom-scrollbars-in-webkit/">Custom Scrollbars in WebKit</a></p>
  
  <pre><code>body::-webkit-scrollbar {
      width: 10px;
      height: 13px;
      background-color: white;
      color: #EBEBEB;
      border:none;
  }
  </code></pre>
  
  <p>This specifies CSS for WebKit browsers. But what does this operator (::) mean in CSS?</p>
  
  <p>Where can I find other such operators in CSS?</p>