Language markup or X-HTML same as HTML, is along with strict observance of all the rules and commands somehow closer to the language of the x TH el that we increase the reliability of the action, will documents in more complex situations existing in the internet today provides. XHTML, types, documents, and modules now and in the future that are, in fact, set and expanded HTML4. This type of documents based on XML are, and to work in combination with the user agent based on XML, have been designed.

XHTML is a replacement for HTML, and in fact, the latest version of it now.