I’m not sure if this is due to [Wikipedia’s new skin][skin] (with the “usability” enhancements), some other MediaWiki update, or if the problem is on Apple’s end (*Update*: [It is a problem with Wikipedia’s new skin][fix]), but this is another good example of why Apple doesn’t want to rely on third-party vendors for anything.
[skin]: http://techblog.wikimedia.org/2010/03/the-change-in-interface-is-coming/ “Blog post on wikipedia’s new skin”
The image above is what I get when looking up the word “Dictionary” in Snow Leopard’s built-in Dictionary application, and clicking Wikipedia. The Wikipedia page is very long, and should have vertical scrollbars, but there are none.
*Update:* [Mac OS X Hints has information on how a “fix”][fix] which involves logging in to Wikipedia and setting your skin to use the previous one.
Hat tip to [Shawn Medero][shawn].
[shawn]: http://shawn.medero.net “Shawn Medero”
[fix]: http://www.macosxhints.com/article.php?story=20100525215150144 “Mac OS X hints fix”