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Hello,

A lot of pages generated by MediaWiki are validated by W3C, but if you look at this:

http://validator.w3.org/check?uri=http://www.mediawiki.org/wiki/Manual:FAQ

You can see that there are errors. It's always the same error. You could see it too on some other pages like:
http://fr.wikipedia.org/wiki/Guitare
http://fr.wikipedia.org/wiki/Etats_unis
...

Thanks for your work!

Retitled; it's section titles beginning with URL-escaped characters that are the problem.  XHTML ids must begin with a letter, apparently (http://www.w3.org/TR/html4/types.html#type-name). 

*** This bug has been marked as a duplicate of bug 9530 ***