User blog comment:NOBODY/Another possible spoiler solution/@comment-5055855-20140423005847/@comment-3060206-20140423045218

But of course; every method is going to have its ups and downs. There is always going to be a risk that a user will end up being spoiled when browsing the wiki, even if we put spoiler warnings between every line. JavaScript codes can run slow or malfunction, users may post spoilers that will be left there until someone who notices them deals with it. We have done what we can reasonably to minimize spoiler content. At the same time, we have to remember we are also a wiki. Sometimes, spoiler content is used for verification of an important fact.

After all, that's part of the reason why we use the spoilerpage template to transclude the category 'Spoiler' rather than just adding it manually. It gives us that opportunity to add a banner that visually alerts the user with its distinct appearance should the spoiler cover not work properly or the user click 'yes' out of curiosity. The only sure way to avoid spoilers 100% on the wiki is to simply not go on it until you're sure you've uncovered all spoiler content there is to know about the game etc.