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In this article, the editor introduces "what is the concept of html css3" in detail, the content is detailed, the steps are clear, and the details are handled properly. I hope this article "what is the concept of html css3" can help you solve your doubts.

A major change in the evolution of CSS is the W3C's decision to divide CSS3 into a series of modules. Browser vendors innovate quickly at the pace of CSS, so by adopting a modular approach, elements in the CSS3 specification can move forward at different speeds, because different browser vendors only support given features. But different browsers support different features at different times, which also complicates cross-browser development.

Development process

As early as 2001, the W3C completed the draft specification of CSS3. A new feature of CSS3 specification is that it is divided into several independent modules. On the one hand, divided into a number of smaller modules is more conducive to timely update and release of the specification, timely adjust the content of the module, these modules are implemented and released independently, but also laid the foundation for the future expansion of CSS. On the other hand, due to the limitations of supported devices and browser manufacturers, unprepared or manufacturers can selectively support some modules to support a subset of CSS3, which is conducive to the promotion of CSS3.

Programming development

CSS3 programming tools and CSS, any kind of text editing tools can be used to write, such as: Windows notepad, notepad; or other special tools for editing web text, such as: IntelliJ IDEA, Eclipse, MyEclipse, webstorm, sublime text;, and there are plug-ins specifically for front-end development, such as: Emmet.

Language foundation

The syntax of CSS3 is based on the previous version of CSS, which allows users to specify specific HTML elements in tags without using redundant class, ID, or JavaScript. Most of the CSS selectors are not new to CSS3, but are not widely used in previous versions. Advanced selectors are useful if you want to try to achieve a clean, lightweight tag and better separation of structure and performance, reducing the number of class and ID in the tag and making it easier for designers to maintain stylesheets.

Advantage evaluation

1. Reduce development costs and maintenance costs

Before the emergence of CSS3, developers often need to add additional HTML tags to achieve a fillet effect, using one or more images, while using CSS3 only needs a tag, which can be done using the border-radius attribute in CSS3. In this way, CSS3 technology frees people from the work of drawing, cutting, and optimizing pictures. If you later need to adjust the Radian of the fillet or the color of the fillet, use CSS2.1, you need to draw and cut from scratch, and you can quickly change it by changing the value of the border-radius attribute using CSS3.

The animation features provided by CSS3 allow developers to stay away from JavaScript when implementing some dynamic buttons or dynamic navigation, so that developers do not have to spend a lot of time writing scripts or looking for suitable script plug-ins to adapt to some dynamic website effects.

2. Improve page performance

Many CSS3 technologies become "substitutes" for images by providing the same visual effects. In other words, reducing the nesting of redundant tags and the number of images used in Web development means that users will have less content to download and pages will load faster. In addition, fewer images, scripts, and Flash files can reduce the number of HTTP requests when users visit a Web site, which is one of the best ways to speed up page loading. Using CSS3 to make a graphical website does not need any pictures, which greatly reduces the number of HTTP requests and improves the loading speed of the page. For example, the animation effect of CSS3 can reduce the HTTP requests for JavaScript and Flash files, but it may require the browser to perform a lot of work to complete the rendering of the animation effect, which may cause the browser to respond slowly and lead to the loss of users. Therefore, you need to consider carefully when using some complex special effects. In fact, many CSS3 technologies can greatly improve page performance in any case [44].

CSS3 will be fully backward compatible, so there is no need to modify the design to keep them working. Web browsers will also continue to support CSS2

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