Thread:Katat0nyx/@comment-15636815-20131118044744/@comment-15636815-20131118155616

Because MediaWiki removed that feature in 2011. The only Wiki way to do it now is to put it in a "div" that is collapsed the way the tables are, except that all you see is a tiny "Expand" link way off to the right. Mostly, we'll get complaints that there's no TOC at all. Other than that, various people have written tweaks; none of them are easy to work with.