User blog comment:JoshuaCoalskull/MediaWiki 1.19.0 is here!/@comment-2040576-20120710195724/@comment-1999071-20120710200238

Personal css/js is bugged, they will not load. Wikia is aware of that issue and is working on a fix.

If I'm reading it correctly, those HTML Elements will no longer work at all. At the moment they are still working, so I don't know if they are keeping some, or that they just haven't removed them yet.