The document provides an overview of new features in CSS3, including new selectors, pseudo-elements, properties, and property groups. Some key points include:
- New selectors allow selecting elements based on attributes, relationships, and positions.
- New pseudo-elements and classes allow selecting elements based on their position or status.
- New properties control features like animation, transitions, transforms, backgrounds, borders, boxes, color, font, text and multi-column layouts.
- Property groups organize related properties for areas like animation, transitions, transforms and user interface.
- The document lists examples and resources for learning about each new CSS3 module.