The difference between css3.0 and css2.0

The difference between css3.0 and css2.0 is in selectors, box models, border styles, text styles, animation and transition effects, and media queries. Detailed introduction: 1. Selectors, CSS3.0 introduces some new selectors, making the selection of elements more flexible and precise, CSS3.0 also introduces pseudo-class selectors; 2. Box model, the box model in CSS2.0 Elements are divided into content areas, padding, borders and margins, and CSS3.0 introduces a new box model called the "flexible box model", which provides more powerful layout capabilities and more.

CSS (Cascading Style Sheets) is a language used to describe the styles of elements on a web page. Its versions are constantly updated to adapt to evolving Internet technology and design needs. CSS2.0 is the second major version of CSS, and CSS3.0 is its successor. This article will explore the differences between CSS3.0 and CSS2.0.

1. Enhancement of selectors

CSS3.0 introduces some new selectors to make the selection of elements more flexible and precise. For example, attribute selectors in CSS 3.0 allow elements to be selected based on their attribute values, not just their tag names. In addition, CSS3.0 also introduced pseudo-class selectors, such as :first-child, :last-child, and :nth-child, making it easier to select elements at specific positions.

2. Improvements in the box model

The box model in CSS2.0 divides elements into content areas, padding, borders and margins. CSS3.0 introduces a new box model called "Flexbox Model" (Flexbox). The flexible box model provides more powerful layout capabilities, allowing elements to automatically adjust their size and position according to the size and layout requirements of the container.

3. Enhancements to border styles

CSS3.0 introduces some new border styles, such as rounded borders, shadow borders and gradient borders. These styles can make the border look more beautiful and complex, thus improving the visual effect of the web page.

4. Enhancement of text styles

CSS3.0 introduces some new text styles, such as text shadow, text gradient and text stroke. These styles can make the text look more vivid and attractive, thus improving the visual effect of the web page.

5. Animation and transition effects

CSS3.0 introduces new animation and transition effects, allowing elements to transition smoothly between different states. By using keyframe animations (@keyframes) and transition attributes, developers can create more vivid and interactive web page effects.

6. Media query

CSS3.0 introduces the media query function, which allows web pages to apply different styles according to different devices and screen sizes. This allows developers to create responsive web pages that adapt to different devices and user needs.

To summarize, CSS3.0 has been enhanced and improved compared to CSS2.0 in terms of selectors, box models, border styles, text styles, animation and transition effects, and media queries. These new features and styles allow developers to create more flexible, beautiful and interactive web pages. However, due to compatibility issues with some older browsers, developers need to consider the browser's support when using CSS3.0 and do a good job of downgrading to ensure the normal display and use experience of web pages on various browsers. .

The above is the detailed content of The difference between css3.0 and css2.0. For more information, please follow other related articles on the PHP Chinese website!