css3 CSS3 (Cascading Style Sheets 3) is the latest version of the CSS specification. It is used for describing the presentation of a document written in HTML, XML, or a similar markup lang..关注已关注 发文章/提问
css3 CSS3 (Cascading Style Sheets 3) is the latest version of the CSS specification. It is used for describing the presentation of a document written in HTML, XML, or a similar markup language. CSS3 introduces many new features and enhancements compared to its predecessors, CSS1 and CSS2.
Some key features of CSS3 include:
1. Selectors: CSS3 introduces new and more powerful selectors, such as attribute selectors, structural pseudo-classes, and negation pseudo-class, allowing for more specific and flexible targeting of elements.
2. Box Model: CSS3 introduces new properties for manipulating the box model, such as box-sizing, which allows the designer to control how the width and height of an element are calculated, and box-shadow, which adds drop shadows to elements.
3. Backgrounds and Borders: CSS3 provides new properties for creating gradient backgrounds, applying multiple background images, and creating rounded borders.
4. Transitions and Animations: CSS3 introduces the transition property, which allows the designer to define smooth transitions between different states of an element. CSS3 also provides keyframe animations, which allow for the creation of complex and customizable animations.
5. Flexbox: Flexbox is a new layout model introduced in CSS3 that allows for more flexible and responsive layouts. It provides a way to align and distribute space between items in a container.
6. Media Queries: CSS3 incorporates media queries, which allow the designer to apply different styles based on the characteristics of the device or viewport, such as screen size or resolution. This enables the creation of responsive and mobile-friendly designs.
These are just a few examples of the many features introduced in CSS3. It has significantly expanded the capabilities of CSS and has become a crucial tool for web designers and developers.