CSS3 Introduction

CSS3 has been split into "modules". It contains the "old CSS specification" (which has been split into smaller pieces). In addition, new modules are added.
Some of the most important CSS3 modules are:

• Selectors
• Box Model
• Backgrounds and Borders
• Image Values and Replaced Content
• Text Effects
• 2D/3D Transformations
• Animations
• Multiple Column Layout
• User Interface

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CSS3 Recommendation

The CSS3 specification is still under development by W3C.
However, many of the new CSS3 properties have been implemented in modern browsers.