That sounds a lot like my scenario. Basically I’m making a plugin to hide things based on whether they have a tag or not:
I’ll take a look at searching for the CSS, though that also seems kind of hacky. It seems like it’d be pretty easy to add the tags to the transformed post object (in transform-post.js.es6 :: transformPost(...)) – it seems like there’s lots of topic data there already. That would make this a lot less hacky