There's a template on this page (template:JavaScript), with more content than the actual page! I've made it uncollapsed by default now (it was autocollapsing, which seemed illogical).
It's not used elsewhere. But it seems like potentially good content?
Either: it should be a proper navbox that is used on multiple pages (for navigating between them, or perhaps for finding the right page if your search arrived at the wrong one, as I often use them for),
or instead it could be converted into content on this page, which thus becomes a standalone index/hub/disambig.
Thoughts? :)