Differences between html, xhtml, and xml _ HTML/Xhtml _ webpage Creation

Html: hypertext markup language; xhtml: extensible hypertext markup language; xml: extensible markup language. For more information, see the development trend of this article:

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

Html:

1. Not case sensitive;

2. tags do not need to appear in pairs;

3.
;

Xhtml:

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

2. tags must appear in pairs. If a start tag exists, the end tag must exist;

3. attribute values must be enclosed in quotation marks;

4. Attribute minimization is not supported:

Eg: Correct:

Error:

5. The name attribute is not in favor of use and will be phased out in the future;

6. Empty elements also need to end tags: for example:
, (Horizontal split line)

Xml:

Html will eventually develop into xml. xhtml is a transition for html to develop xml, and the features of xhtml are also suitable for xml;