title: duplication of option value on datalist in html
body: <p>I used HTML datalist for auto completion. My code is:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;input list="browsers" name="browser"/&gt;
  &lt;datalist id="browsers"&gt;
    &lt;option value="Internet Explorer"&gt;&lt;/option&gt;
    &lt;option value="Firefox"&gt;&lt;/option&gt;
    &lt;option value="Chrome"&gt;&lt;/option&gt;
    &lt;option value="Opera"&gt;&lt;/option&gt;
    &lt;option value="Safari"&gt;&lt;/option&gt;
  &lt;/datalist&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>When I execute the above code, the first option will shown more than one times.
  Can you say Why the duplication occurring?? 
  <a href="http://jsfiddle.net/y84pphy9/" rel="nofollow">http://jsfiddle.net/y84pphy9/</a></p>