Last modified: 2011-03-13 18:06:52 UTC
It is possible to create multiple top-level headers in articles. 1. Is this ever a good thing to do? 2. This breaks W3C specs by creating more than one <h1> tag.
It's possible in mediawiki : = header = = second header = == sub1 == == sub2 == There is not a lot of thing we can do about that anyway. Of course it's still possible to prompt an error message but that will annoys users. Can you optionally give us an url with that W3C spec ?
The bug is that it is possible, but it should be impossible (at least with wikimarkup). It breaks Web Content Accessibility Guidelines 1.0, Priority 2 (see http://www.w3.org/TR/WCAG10-HTML-TECHS/#grouping).
Sorry I don't see anything related to "only one H1 tag per document". On the other hand, the document you pointed to advice to use H1 then H2. H1 -> H3 and skipping H2 should be forbidden. Again I am not sure how to patch that in mediawiki, it will probably just annoy users. Experience show that most mediawiki users use H2 directly anyway.
My bad, sorry for the bugspam.
