title: Javascript event on CSS style change from block to none
body: <p>Is there a pure Javascript event (no jQuery) that is fired when I change the CSS style of my <code>div</code> from <code>block</code> to <code>none</code>. I was under the impression I can catch that via "<code>onBlur</code>" but looks like I cannot!</p>
  
  <p>Please advise!</p>