title: After customizing css for tooltip, it is showing twice
body: <p>After customizing the CSS for tooltip msg, it showing twice in the screen. Below is the kind of implementation provided.</p>
  
  <pre><code>&lt;a href="#" title="This is some information for our tooltip." class="tooltip"&gt;
      &lt;span title="More"&gt;CSS3 Tooltip&lt;/span&gt;
  &lt;/a&gt;
  </code></pre>
  
  <pre class="lang-css prettyprint-override"><code>.tooltip {
      display: inline;
      position: relative;
  }
  
  .tooltip:hover:after {
      background: #333;
      background: rgba(0,0,0,.8);
      border-radius: 5px;
      top: 26px;
      color: #fff;
      content: attr(title);
      left: 20%;
      padding: 5px 15px;
      position: absolute;
      z-index: 98;
      width: 220px;
  }
  
  .tooltip:hover:before {
      border: solid;
      border-color: #333 transparent;
      border-width: 0 6px 6px 6px;
      top: 20px;
      content: "";
      left: 50%;
      position: absolute;
      z-index: 99;
  }
  </code></pre>
  
  <p>Sample Output:</p>
  
  <p><a href="https://i.stack.imgur.com/fVlPB.png" rel="noreferrer"><img src="https://i.stack.imgur.com/fVlPB.png" alt="enter image description here"></a></p>
  
  <p>Help me to find the cause of this and how can we suppress the 2nd tooltip msg</p>
  
  <p>jsfiddle (<a href="https://jsfiddle.net/tamjpzdq/5/" rel="noreferrer">sample view</a>)</p>