Actually, it is messed up in Firefox too (well, Aurora, Firefox 10.0 alpha).
Thread screwed up in Safari
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http://www.chess.com/forum/view/general/how-to-move-a-castling
On the latest version of Safari running on MacBook Pro running OS 10.7.x, the forum thread above is very poorly formatted. It looks like copy/pasted web content into the thread screwed up the CSS for the page.