"Since some users skim through a document by
navigating its headings, it is
important to use them appropriately to convey document structure. Users
should order heading elements properly. For example, in HTML, H2 elements
should follow H1 elements, H3 elements should follow H2 elements, etc. Content
developers should not "skip" levels (e.g., H1 directly to
H3)."http://www.w3.org/TR/WCAG10-HTML-TECHS/
Since we are validating to XHTML 1.0 Strict, I believe this accessibility
guidance should be followed.
We're certainly not validating as XHTML 1.0 Strict! We're marking output
as XHTML 1.0 Transitional and making a good-faith effort to have output
validate to the transitional DTD (though some wikitext constructs will
not validate).
-- brion vibber (brion @