Extensible Hypertext Markup Language is a markup language whose expression is similar to Hypertext Markup Language (HTML), but its syntax is more strict. In terms of inheritance relationship, HTML is an application based on the Standard Universal Markup Language and is a very flexible markup language, while XHTML is based on the Extensible Markup Language, which is a part of the Standard Universal Markup Language. Subset. XHTML 1.0 became a W3C recommendation on January 26, 2000.
Studying the "Li Yanhui XHTML Video Tutorial" course will let you know the difference between XHTML, html and htm, understand the use of XHTML, and illustrate it through examples, making it easier to master the basic knowledge of XHTML.