The connections and differences between HTML, XHTML, and XML

HTML and XML: both of them are markup languages (ML), one is the hypertext labeling language, and the other is the extensible banner. The difference between them:

1) Extensibility: HTML is not extensible, and XML is the original markup language that can be used to define new markup languages.

2) Focus: HTML focuses on how to represent information, while XML is focused on how structured the descriptive information is.

3) syntax requirements: HTML does not require the nesting of tags, pairing, etc., do not require a certain order between the tags, and XML is strict requirements of nesting, pairing, following the DTD tree structure.

4) Readability and maintainability: HTML is difficult to read and maintain, while XML structure is clear and easy to read and maintain

5) Data and display relationships: HTML content description and display integration is unique, while XML is phase-separated

The last point is their editing tools, HTML has a bunch of editing tools, and XML is not yet mature.

As for XHTML, it is a standard between HTML and XML, which is a requirement for HTML to conform to the XML syntax specification. However, the current browser support for XHTML is not very good.

The difference between HTML and XHTML:

1) XHTML comparison and html,xhtml documents have a good and complete layout, reflected in two aspects: A, the element must have an end tag; b, the element must be nested;

2) for HTML elements and attributes, XHTML must be lowercase, because XML is strictly case-sensitive,

• And
• is a different label;

  3) XHTML attribute values must be in quotation marks;

  4) XHTML does not support attribute minimization, what is attribute minimization?

  Correct: Non-minimized attribute (unminimized attributes)

  Incorrect: Minimize attribute (minimized attributes)

  5) in XHTML, the name attribute is deprecated and will be removed in a later release.

  Besides, why does the Web page encoding evolve from HTML XHTML? xml?

  The early-morning page is written in HTML, but it has three serious drawbacks:

  1) coding is not standard, the structure is messy and bloated, need intelligent terminal to be very good display;

  2) Performance and structural confusion, not conducive to development and maintenance;

  3) can not use more network equipment, such as mobile phones, PDA, etc.;

  So HTML needs development to solve this problem, so the xhtml,xhtml is a bridge to HTML over XML. and XML is the trend of web development.

The connections and differences between HTML, XHTML, and XML