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This article introduces the relevant knowledge of "how to understand css3 and HTML5". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

CSS3 is an updated version of CSS technology, and elements in the CSS3 specification can move forward at different speeds, because different browser vendors only support given features. HTML5 is the fifth major modified version of HTML, the specification of HTML, the core language of Web, and a language description way to build Web content.

The operating environment of this tutorial: windows7 system, CSS3&&HTML5 version, Dell G3 computer.

What is CSS3?

CSS is the abbreviation of Cascading Style Sheets (cascading style sheet). It is a computer language used to represent file styles such as HTML (an application of standard general markup language) or XML (a subset of standard general markup language).

CSS can accurately control the layout of elements in a web page at the pixel level, support almost all font size styles, and have the ability to edit web objects and model styles.

CSS3 is an upgraded version of CSS (cascading style sheet) technology, which was developed in 1999. W3C completed the working draft of CSS3 on May 23,2001.It mainly includes box model, list module, hyperlink mode, language module, background and frame, text special effects, multi-column layout and so on.

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.

The principle of CSS3, like CSS, is to customize the selector of a stylesheet in a web page, and then refer to a large number of these selectors in the web page.

What is HTML5?

HTML5 is the fifth major revision of Hypertext markup language (HTML), while HTML is a standard programming language for describing the content and appearance of web pages. HTML5 supports traditional HTML and XHTML-style syntax as well as its markup, new API,XHTML, and other new features in error handling.

HTML5 is a language description for building Web content. HTML5 is the next generation standard of the Internet and a language way to construct and present Internet content. It is considered to be one of the core technologies of the Internet. HTML came into being in 1990. In 1997, HTML4 became the Internet standard and was widely used in the development of Internet applications.

HTML5 is the specification of HTML, the core language of Web. The content that users see when browsing web pages by any means is originally in HTML format, and it is transformed into identifiable information through some technical processing in the browser. HTML5 has made some improvements on the basis of the previous HTML4.01, although technicians may not put these new technologies into application in the development process, but website developers must have some understanding of the new features of this technology.

HTML5 was developed to address compatibility issues that affect the current standard HTML4. One of the biggest differences between HTML5 and previous versions of the standard is that older versions of HTML require proprietary plug-ins and API. (this is why pages built and tested in one browser may not load correctly in another browser.) HTML5 provides a generic interface to make it easier to load elements. For example, you do not need to install the Flash plug-in in HTML5 because the element will run on its own.

The primary goal of HTML5 is to improve compliance and enhance compliance by making it easier for Web developers and browser creators to follow consensus-based standards. It also aims to provide a better, faster, and more consistent user experience for desktop and mobile visitors.

One of the design goals of HTML5 is to support multimedia on mobile devices. New syntax features have been introduced to support this feature, such as video, audio and canvas tags. HTML5 also introduces new features that can really change the way users interact with documents.

Description:

HTML5 and CSS3 are not only two new Web technical standards, but also represent the next generation of HTML and CSS technologies. Although the standard specification of HTML5 has not been officially released, the future development prospect can be predicted, that is, HTML5 will be used by more and more Web developers, and the major major browser manufacturers have actively updated their products to better support HTML5.

HTML5 revolves around a core: to build a more powerful Web application development platform.

1) more descriptive tags: HTML5 introduces a lot of descriptive tags, such as defining header (header), tail (footer), navigation area (nav), sidebar (aside) and so on, making it very convenient for developers to build page elements.

2) good multimedia support: for the trouble caused by playing audio and video in the way of plug-ins, HTML5 has a solution, audio tags and video tags can easily achieve response.

3) more powerful Web applications: HTML5 provides amazing features, and in some cases, you can even give up using third-party technologies altogether.

4) Cross-document message communication: Web browsers organize scripting interactions or influences between different domains, but may be troublesome for trusted scripts. HTML5 introduces a set of solutions that are safe and easy to implement.

5) Web Sockets:HTML5 provides support for Web Sockets.

6) client-side storage: Web Storage and Web SQL Database API of HTML5, which can build client-side persistent data of Web application in browser.

7) more exquisite interface: the interface effect rendered by HTML5+CSS3 combination is sometimes unimaginable.

8) more powerful forms: HTML5 provides more powerful form interface controls, which are very easy to use.

9) improve accessibility: the content is clearer, the user's operation is more simple and convenient, and the experience is improved.

10) Advanced selector: CSS3 selector can easily identify parity rows, check boxes, etc., with fewer code tags.

11) Visual effects: part of the beautiful interface, such as shadows, gradients, rounded corners, rotation and other visual effects.

For some browsers that do not fully support HTML5,HTML5, you can easily add code compatible with adaptive alternative solutions to your code. When the HTML5 code is written, the W3C validation service can be used for verification (in contrast, because the HTML5 standard is still evolving).

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