title: jQuery selector targeting element with id AND class does not work
body: <p>I have the following event-handling function:</p>
  
  <pre><code>jQuery(document).on('click', '#button .submitb', function(e){alert();});
  </code></pre>
  
  <p>jQuery IS included in the html document. But, if I click on a <code>&lt;div id="button" class="submitb"&gt;Go!&lt;/div&gt;</code> nothing happens. I don't even get an error in the chrome-console.</p>