Christian Heilmann, principal evangelist for HTML5 and the open web at Mozilla, explains how to progressively enhance CSS rollover effects into the 3D space Rollovers are a great thing. They make things more obvious that they are interactive and they allow us to show something different without giving up valuable screen estate. I remember one time when I won a pitch for my company by showing a rollover effect on a menu button. Granted, that was 1998 and nowadays we are less excited about them. This is a shame though as we have a lot more things to play with in browsers these days. Here we'll take a look at using CSS, 3D CSS transformations, transitions and CSS animations to create some great rollover styles without telling people that they need to have certain browser. Instead, we'll fall back to a plain rollover for all CSS capable browsers. For brevity's sake we won't have all browser prefixes in the code examples here, but they are in the final product