Board Thread:Support Requests - Getting Technical/@comment-32658037-20181021182202/@comment-24014422-20181021210937

That's because it relies on CSS to happen. Whenever the "spoilerblur" class name exists on a page, these rules should have been applied to its text (which makes the text enclosed by the class's html element blurry like you want): But, since you haven't imported it into your wiki's Wikia.css, it didn't work on your text.