title: add event listener on elements created dynamically
body: <p>Is possible to add event listener (Javascript) to all dynamically generated elements?
  I'm not the owner of the page, so I cannot add a listener in a static way.</p>
  
  <p>For all the elements created when the page loaded I use:</p>
  
  <pre><code>doc.body.addEventListener('click', function(e){
  //my code
  },true);
  </code></pre>
  
  <p>I need a method to call this code when new elements appear on the page, but I cannot use jQuery (delegate, on, etc cannot work in my project). How can I do this?</p>