Explain in detail the difference between css and css3

CSS (Cascading Style Sheets) is a markup language used to describe the appearance of HTML (Hypertext Markup Language) documents. In web development, CSS can be used in conjunction with HTML to control the positioning, layout, fonts, colors and other aspects of various elements of the web page. With the continuous development of web technology, CSS3 has gradually become one of the mainstream standards for web development. So what are the differences between it and CSS?

1. Different definition methods

CSS is a style sheet language based on document markup language, by adding the style attribute in the HTML tag or directly using an external style sheet Set the style of the web page. CSS3 also uses this method to define styles, but the specific syntax is different from CSS.

2. New style attributes

Different from CSS, CSS3 introduces a large number of new style attributes, enriching the choices in the web design process. For example, CSS3 has added various style attributes such as animation, text shadow, gradient, and transformation. The introduction of these attributes has greatly improved the user experience and visual effects of web pages.

3. Browser compatibility

Compared with CSS, CSS3 has poor browser compatibility and requires multiple testing and debugging during actual development. CSS has good compatibility and can be supported by most browsers. Therefore, in some projects with high compatibility requirements, using CSS is safer and more stable.

4. Performance capability optimization

CSS3 can better optimize the performance of web pages. For example, its gradient effects, shadow effects, etc. are all implemented through CSS3 hardware acceleration technology, which can more effectively improve the performance of the page than the previously used JS animation effects.

5. Application areas

CSS3 is mainly used to achieve completely different design effects, such as animation, 3D transformation, text shadow, etc. CSS mainly reflects the basic effects of the interface, such as fonts, colors, backgrounds, etc. Therefore, the choice between using CSS or CSS3 needs to be made based on actual project needs and design requirements.

In summary, CSS and CSS3 are both style sheet languages ​​and play an irreplaceable and extremely important role in web design. CSS3 is more powerful than CSS, but its compatibility and difficulty in use are slightly higher. Actual applications need to consider the usage when selecting.

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