What is the difference between html and xhtml and xml

This time I will bring you what is the difference between html and xhtml and xml, what are the precautions about the difference between html, xhtml and xml, the following is a practical case, let’s take a look one time.

Development Trend:

html (Hypertext Markup Language) - xhtml (Extensible Hypertext Markup Language) - xml (Extensible Markup Language);

html:

1. Insensitive to case;

2. Tags do not have to appear in pairs;

3.
;

xhtml:

1. It is case-sensitive and must be lowercase;

2. Tags must appear in pairs, and if there is a start tag, there must be an end tag;

3 .Attribute value must be within quotation marks;

4. Attribute minimization is not supported:

eg: Correct:

Error:

5. The name attribute is deprecated and will be eliminated in the future;

6. Empty elements must also end with tags: such as: < br/>,

---

(horizontal dividing line)

xml:

html will eventually develop into xml. xhtml is a transition between html and xml. The characteristics of xhtml Also suitable for xml;

I believe you have mastered the method after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!

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