title: How to trigger an event if an element's display property is changed?
body: <p>Something like:  </p>
  
  <pre><code>element.addEventListener("displayChanged", function(){
      console.log("element.style.display changed.")
  }, false);  
  </code></pre>
  
  <p>Of course, there is no <code>displayChanged</code> there, but I'm wondering how can I do this? Only Chrome support is needed.</p>