title: Overflow:hidden - How does it actually work?
body: <p><code>overflow:hidden</code> hides content as we all know but is that hidden content still executed ?</p>
  
  <p>For example: if I use <code>overflow:hidden</code> to "hide" an ad banner that counts impressions, will impressions still count when banner is hidden? </p>
  
  <p>I will use JavaScript to slide some affiliate banners on page refresh, impressions don't matter really, but would like to understand more of CSS. </p>
  
  <p>Thanks. </p>