title: Casperjs/PhantomJs vs Selenium
body: <p>We are using Selenium to automate our <code>UI</code> testing. Recently we have seen majority of our users using Chrome. So we wanted to know - pros and cons of using PhantomJS vs Selenium:</p>
  
  <ul>
  <li>Is there any real advantage in terms of performance, e.g. time taken to execute the test cases?</li>
  <li>When should one prefer PhantomJS over Selenium?</li>
  </ul>