User blog comment:BertH/Layout and navigation updates coming October 3/@comment-3186827-20120919230613/@comment-1724320-20120919231547

WoWWiki has an extra-wide width as a concession to the community back in 2010 when they were angry about the reskin. They ended up moving on anyway, but they got that because the stats showed that almost all of their visitors had screens that could accommodate a larger width (being a game, you know). It has nothing to do with CSS, and I don't think they're going to try it again on any other wikis.