| XHTML (Extensible HyperText Markup Language) is
an application of XML, a more restrictive subset of SGML. Because
they need to be well-formed, true XHTML documents allow for automated
processing to be performed using standard XML tools—unlike HTML,
which requires a relatively complex, lenient, and generally custom
parser. XHTML can be thought of as the intersection of HTML and XML
in many respects
XHTML is the standard markup language for web documents and the
successor to HTML 4. A mixture of classic (HTML) and cutting–edge
(XML), this hybrid language looks and works much like HTML but is
based on XML, the web’s “super” markup language,
and brings web pages many of XML’s
If you want your site to work well in today’s browsers and
non–traditional devices, and to continue to work well in tomorrow’s,
it’s a good idea to author new sites in XHTML, and to convert
old pages to XHTML as your work schedule permits.
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