The difference between html, xhtml and xml
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Development Trends: html (Hypertext Markup Language) - xhtml (Extensible Hypertext Markup Language) - xml (Extensible Markup Language); html: 1. Not case sensitive; 2. Tags do not have to appear in pairs; 3.<br>; xhtml: 1. Case sensitive, must be lowercase; 2. Tags must appear in pairs. If there is a start tag, there must be an end tag. 3. The attribute value must be within quotation marks; 4. Attribute minimization is not supported: Eg: Correct: <input checked='checked'> Error: <input checked> 5. The name attribute is not recommended for use and will be eliminated in the future; 6. Empty elements also need end tags: such as: <br/>, <hr/> (horizontal dividing line) xml: HTML will eventually develop into XML. XHTML is a transition from HTML to XML, and the characteristics of XHTML are also suitable for XML. |
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