Board Thread:The Editors Board (aka Todo)/@comment-1117661-20150529214531/@comment-4629185-20150531061003

One thing I found that might work pretty well is this http://dev.wikia.com/wiki/SpoilerAlert, you can set it so that every page in a category has a spoiler notice over-top of the article until you click to allow spoilers. Sadly, uses JS, so I don't think there is going to be a super easy way of implementing it on JUST an infobox/section (though if we were going to end up writing JS anyway, might as well have a starting point haha), but it would work for entire articles.

edit: I'm not going to have a chance to actually mess with this for a couple days (helping a family member finish their garage, so I've been super busy with that haha), but looking through the code for the SpoilerAlert thing, it appears it might actually be as simple as changing the  id tags to something of our own.