from
The Free On-line Dictionary of Computing (8 July 2008)
Extensible HyperText Markup Language
XHTML
<hypertext, standard, World-Wide Web> (XHTML) A reformulation
of {HTML} 4.01 in {XML}. Being XML means that XHTML can be
viewed, edited, and validated with standard XML tools. At the
same time, it operates as well as or better than HTML 4 in
existing HTML 4 conforming user agents.
The most important change is that all elements must be
terminated, either with a closing tag or using the <tag.../>
shorthand. So, instead of
<input type=submit>
you would write
<input type="submit" />
The space before the "/" is required by some older browsers.
Other differences are that tag and attribute names should be
lower case and all attributes should be quoted.
XHTML Home (http://w3.org/TR/xhtml1/).
Quick Summary
(http://technorealm.co.uk/design/html-to-xhtml-conversions.html)
Latest version: 1.0 Second Edition 2002-08-01, as of 2004-03-16.
(2006-01-19)