1. This Page will show CSS @media query in action. Try to resize the window and see change in colour of the box.
  2. For changing the Responsive Adsense ad size you need to refresh the page as Ads size is determined on first page load only.
  3. In Internet Explorer 8 and below version the default style will only apply and no change can be seen.
  4. Responsive Adsense Example needs to be read along with RESPONSIVE ADS GOOGLE