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This article introduces the relevant knowledge of "what is the WEB standard?" in the operation of actual cases, many people will encounter such a dilemma, and then 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!

The WEB standard is not a standard, but a collection of a series of standards.

The web page mainly consists of three parts: structure (Structure), performance (Presentation) and Behavior (behavior).

The corresponding standard is also divided into three aspects: structured standard language mainly includes XHTML and XML, presentation standard language mainly includes CSS, behavior standard mainly includes object model (such as W3C DOM), ECMAScript and so on. Most of these standards are drafted and published by the W3C, and some are developed by other standards organizations, such as the ECMAScript standard of ECMA (European Computer Manufacturers Association).

1. Structural standard language

(1) XML

XML is an abbreviation for The Extensible Markup Language (Extensible markup language). It is currently recommended to follow the XML1.0 released by the W3C on October 6, 2000, for reference.

Like HTML, XML also comes from SGML, but XML is a language that can define other languages. XML was originally designed to make up for the shortcomings of HTML and to meet the needs of network information release with strong expansibility, and then gradually used to transform and describe network data. There are no more details about the benefits and technical specifications of XML. There are a lot of materials and books on the Internet for reference.

(2) XHTML

XHTML is an abbreviation for The Extensible HyperText Markup Language Extensible markup language. Currently, it is recommended to follow XML1.0 recommended by W3C on January 26th, 2000.

Although XML has strong data conversion ability and can completely replace HTML, it is too early to adopt XML directly in the face of thousands of existing sites. Therefore, we extend it with the rules of XML on the basis of HTML4.0 and get XHTML. To put it simply, the purpose of establishing XHTML is to achieve the transition from HTML to XML.

two。 Expressive standard language

CSS is an abbreviation for Cascading Style Sheets cascading style sheets. At present, it is recommended to follow CSS2 recommended by W3C on May 12, 1998. The W3C created the CSS standard to replace HTML tabular layouts, frames, and other expressive languages with CSS. The combination of pure CSS layout and structured XHTML can help designers separate appearance from structure, making it easier to access and maintain the site.

3. Standard of conduct

(1) DOM

DOM is an acronym for the Document Object Model document object model. According to the W3C DOM specification, DOM is an interface with browsers, platforms, and languages that allows you to access other standard components of the page. To put it simply, DOM resolves the conflict between Netscaped's Javascript and Microsoft's Jscript, giving web designers and developers a standard way to access data, scripts, and presentation objects on their sites.

(2) ECMAScript

ECMAScript is a standard scripting language (JAVAScript) developed by ECMA (European Computer Manufacturers Association). Currently, it is recommended to follow ECMAScript 262.

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