Cascading Style Sheets/Hacks and Filters

Browser Specific Filters
Opera 10+ CSS Filter IE6/IE7 CSS Filter IE7 CSS Filter IE8 CSS Filter IE9 CSS Filter Webkit CSS Filter Konqueror CSS Filter Safari 2 CSS Filter Firefox CSS Filter Firefox 3.6+ CSS Filter Firefox 3.0+ CSS Filter

Legacy Browser Hacks
All web browsers are not equal and different rendering of the same code, even if the code is validated, can destroy a web page's presentation. To work around this a large community of browser hacks has been developed. These hacks should be avoided at all cost because they may break one's code in other browsers or slow down performance. However sometimes it is impossible to avoid the use of all of these hacks.

Be aware that constant browser updates may cause hacks to not work in the future.
 * Caio Hack — hides rules from Netscape 4, even 'inline' CSS