Although there is no requirement for XHTML 1.0 documents to be compatible with existing user agents, in practice this is easy to accomplish. Guidelines for creating compatible documents can be found in Appendix C.
5.1. Internet Media Type
XHTML Documents which follow the guidelines set forth in Appendix C, “HTML Compatibility Guidelines” may be labeled with the Internet [...]
This section is informative.
Due to the fact that XHTML is an XML application, certain practices that were perfectly legal in SGML-based HTML 4 [HTML4] must be changed.
4.1. Documents must be well-formed
Well-formedness is a new concept introduced by [XML]. Essentially this means that all elements must either have closing tags or be written in a special form [...]
3.1. Document Conformance
This version of XHTML provides a definition of strictly conforming XHTML 1.0 documents, which are restricted to elements and attributes from the XML and XHTML 1.0 namespaces. See Section 3.1.2 for information on using XHTML with other namespaces, for instance, to include metadata expressed in RDF within XHTML documents.
3.1.1. Strictly Conforming Documents
A Strictly [...]
This section is normative.
2.1. Terminology
The following terms are used in this specification. These terms extend the definitions in [RFC2119] in ways based upon similar definitions in ISO/IEC 9945-1:1990 [POSIX.1]:
May
With respect to implementations, the word “may” is to be interpreted as an optional feature that is not required in this specification but can be provided. With [...]
This section is informative.
XHTML is a family of current and future document types and modules that reproduce, subset, and extend HTML 4 [HTML4]. XHTML family document types are XML based, and ultimately are designed to work in conjunction with XML-based user agents. The details of this family and its evolution are discussed in more detail in [...]
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