title: Find buttons (onclick) and click all of them
body: <p>i have trouble. Im using java and webdriver. I want to go <a href="http://demo.opencart.com/" rel="nofollow">http://demo.opencart.com/</a>, find "ipod", 
  I have 4 results, and I want to compare them (by clicking under each button "compare"), but there are 2 problem.</p>
  
  <ol>
  <li><p>how to click on compare (there are onclick)</p>
  
  <p><code>&lt;button type="button" data-toggle="tooltip" title="" onclick="compare.add('48');" data-original-title="Compare this Product"&gt;&lt;i class="fa fa-exchange"&gt;&lt;/i&gt;&lt;/butto</code>n></p></li>
  <li><p>how to compare all my search results?</p></li>
  </ol>