Be based on HTML 4 above all in XML elaborate again, the result produced XHTML1.0. The HTML Compatibility Guidelines that as XHTML1.0 normative appendix C releases (HTML compatibility is directive) , the user of consist in HTML that makes XHTML1.0 documentation consistent acts as agent.

Next one pace, it is to facilitate in documentation compositive use, modular elemental attribute, assemble through integrated XHTML and other sign. This module is in one article of Modularization Of XHTML regulation. XHTML Basic is a kind of language that accepted in these module the smallest framework and target are direction of development of shift application process.

XHTML1.1 is an example of large framework module, removed a lot of features that behave a layer. Although XHTML1.1 looks special,be similar to XHTML 1.0 Strict, but he is planned to use appropriative patulous in the future XHTML type of familial series documentation, and the addition that its module design makes him easier is other must module or its itself conformity goes in other label language. Type of documentation of XHTML 1.1 Plus MathML 2.0 is a kind of type of documentation of similar XHTML familial series.

XHTML2.0 plans to abound, the is based on Web application process that can transplant uses. Although the ancestors of XHTML comes from HTML 4, XHTML 1.0, with XHTML 1.1, but do not plan to be the same as in the past version undertakes backward compatible. He is the language of host of a kind of XHTML that in serving as Modularization Of XHTML, provides. Same, he describes the element of the language and property jointly by a series of XHTML, reach the module composition of their content model. XHTML 2.0 defines a lot of module in Modularization Of XHTML newlier, reach those who included those module and all semantics to replace edition. XHTML2.0 also is used come from Ruby, XMLEvents, with the module of XForms.