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# CSS3 Introduction * * * CSS3 is fully backward compatible, so you don't need to change your existing designs. !( * * * ## CSS3 Modules CSS3 has been split into "modules". The old specification has been broken down into smaller pieces, with new ones added. Some of the most important CSS3 modules are as follows: * Selectors * Box Model * Backgrounds and Borders * Text Effects * 2D/3D Transforms * Animations * Multiple Column Layout * User Interface * * * ## CSS3 Recommendations W3C's CSS3 specification is still under development. However, new browsers now support CSS3 properties.