title: lazy load doesnt work with hidden elements
body: <p>this is my simple test code for lazy load</p>
  
  <p><a href="http://codepen.io/kevkev/pen/bVVGdE" rel="nofollow">http://codepen.io/kevkev/pen/bVVGdE</a></p>
  
  <p>it works so far .. but the thing is that hidden images in an onclick function for buttons etc. doesnt work!
  (watch through my code and scroll to end and push the button)</p>
  
  <p>you can see in the network feedback that it already had load the images.</p>
  
  <p>i could figure out that the problem is "display:none"</p>
  
  <pre><code>.pop {
   display:none;
   z-index:99;
   position:absolute;
   width:100%;
   height:auto;
   background:inherit;
      }
  </code></pre>