Things aren't 100% clean yet, but some tweaks are starting to go in to
make output pass as XHTML.
If you'd like to test it, set these in your LocalSettings.php:
$wgMimeType = "text/xml";
$wgDocType = "-//W3C//DTD XHTML 1.0 Transitional//EN";
$wgDTD = "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";
Mozilla will let you know immediately when it finds output that's not
well-formed XML by freaking out and refusing to show the page. :)
UI markup cleanup is tedious but easy. The parser still may need some
tweaking here and there, and particularly clean-up for user-written
HTML in wiki pages is an area that needs to be carefully checked.
Someday it might be neat to conform to XHTML 1.0 Strict, but that's a
freakier land where things like 'width' and 'height' attributes are
forbidden.
-- brion vibber (brion @
pobox.com)