title: How to make fontawsome icon spin in a button that is disabled
body: <p>i have a form with a submit button:</p>
  
  <pre><code>&lt;button type="submit" class="btn btn-success dis-form-button"&gt;
    &lt;i class="spinner fa fa-spinner fa-spin"&gt;&lt;/i&gt;
      Sign-in
  &lt;/button&gt;
  </code></pre>
  
  <p>the spinner icon is hidden on page load.
  when i submit the form i catch the onSubmit event and disable the button &amp; show the spinner icon, but the spinner does not spin when the button is disabled?
  any ideas?</p>
  
  <p>Thanks in advance.</p>