What was the version before html5?-Front-end Q&A-php.cn

The version before html5 was "XHTML 1.0", a standard launched in 2000. XHTML is a stricter and purer version of HTML. It is a combination of XML and HTML. XML is used to load data. Tags must be marked correctly, while HTML is used to display data.

What was the version before html5?

The operating environment of this tutorial: Windows 7 system, HTML5 version, Dell G3 computer.

HTML version

Since the early days of the Web, multiple HTML versions have been developed:

##XHTML5

Introduction to common versions of HTML

1. HTML

Hypertext Markup Language (Hyper Text Markup Language), an application under the Standard Generalized Markup Language SGML (Standard Generalized Markup language). HTML is not a programming language, but a markup language, which is necessary for web page production. "Hypertext" means that the page can contain pictures, links, and even non-text elements such as music and programs. The structure of Hypertext Markup Language (or Hypertext Tag Language) includes the "head" part and the "body" part. The "head" part provides information about the web page, and the "body" part provides the specific information about the web page. content.

HTML language is used to describe web pages.

HTML refers to Hypertext Markup Language: Hyper Text Markup Language
HTML is not a programming language, but a markuplanguage
Markup language is a set of markup tags (markup tag)
HTML uses markup tags to describe web pages
HTML documents contain HTML tags and text content
HTML The document is also called web page

##2. XHTML

XHTML is a stricter and purer version of HTML. It is It is a combination of XML and HTML. XML is used to load data. Tags must be marked correctly, while HTML is used to display data. Therefore, by combining the strengths of the two, XHTML is created.

XHTML is the English abbreviation of EXtensible HyperText Markup Language, which is an extensible hypertext markup language.

XHTML language is a markup language that does not require compilation and can be executed directly by the browser.

XHTML is used to replace HTML and was announced by w3c in 2000.

XHTML is an enhanced HTML, its scalability and flexibility will adapt to more needs of future network applications.

XHTML is an XML-based application.

XHTML is more concise and rigorous.

XHTML can also be said to be an upgraded version of HTML.

XHTML is case-sensitive, and XHTML is different from html. Standard XHTML tags should be lowercase.

3, HTML5

HTML5 is the result of cooperation between W3C and WHATWG, which refers to the Web Hypertext Application Technology Working Group. .

The WHATWG works on web forms and applications, while the W3C focuses on XHTML 2.0. In 2006, the two parties decided to collaborate to create a new version of HTML. HTML5 is designed to support multimedia on mobile devices. HTML5 is easy to learn.

Common differences between HTML4.01, XHTML, and HTML5

1, Statement Differences (HTML4.01, XHTML, HTML5)

HTML has multiple different versions. Only by accurately specifying the exact HTML version in the page can the browser display the HTML page correctly. That's what is for. is not an HTML tag, it just provides a declaration to the browser, so it has no closing/ending tag!

HTML 5:

HTML 4.01 specifies three document types: Strict, Transitional, and Frameset. The Chinese translation is: strict version, transitional version, and frame-based version of!

XHTML 1.0 also specifies three document types: Strict, Transitional, and Frameset. The Chinese translation is: strict version, transitional version, and frame-based version!

Strict:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN" "http://www.w3.org/TR/html4/strict.dtd">

Copy after login

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

Copy after login

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "
http://www.w3.org/TR/html4/loose.dtd">

XHTML 1.0:
    <!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

Copy after login

HTML 4.01:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "
http://www.w3.org/TR/html4/frameset.dtd">

XHTML 1.0:
    <!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">

Copy after login

2. The difference between HTML and XHTML

HTML is an application based on the standard general markup language SGML, while XHTML is based on the extensible markup language XML. A subset of Universal Markup Language;

XHTML elements must be nested correctly.