After much googling around (I was fascinated by this question) and
much reading of various W3C documents here and there, I can say with
about 97.3% certainty that the W3C has never drafted a recommendation
that standardized file extensions. Most of their recommendations
include URI examples that use the .html extension and the site itself
appears to use .html extensions: http://www.w3.org/TR/xhtml1/Cover.html.
The real story of why .htm and three letter extensions were ever used
is told in a round about way here: http://en.wikipedia.org/wiki/Filename_extension
.
Given the history of filename extensions, I can see how someone might
think that a three-letter extension is required (and maybe--for some
strange reason--the server's settings do require html to be served
as .htm and .html files are served differently). Whatever the case,
the W3C doesn't recommend .htm as a standard.
--
Jody Tate
Web Developer - UW Network Systems
http://staff.washington.edu/jtate/
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