Board Thread:Support Requests - Designing Your Wiki/@comment-4620100-20130710164632/@comment-11733175-20130710182342

Whilst Princess Platinum is correct you can apply a pure CSS method too.

If you look at the page source of any page on a wiki (I forget how long ago this was introduced), you'll notice the body tag has a class specific to that page. For here that would be

You can then apply that to elements on that page, for example: .page-Thread_544703 .foo { display: none; }

I'd always recommend a pure CSS method where possible as it loads before the page renders, whereas javascript loads somewhere after the document ready state and could take several seconds to finish applying the changes depending on what else is being done.