Also reading through the post linked at the end that has more details, this proposal actually seems pretty well-designed. Most importantly, it's very easy to use, and that's important for accessibility features (otherwise no one will put these attributes on their websites).
Looking forward to being able to use this, but it's probably going to take a while for it to be accepted and implemented across browsers. Not sure what the process for that actually looks like.

This looks interesting. Hard to call it a pilot episode if there's apparently already been quite a few videos for it (?), but I guess it's kind of true.
From the description of this video, it mostly just seemed like they were implying this actually existed as a game as a funny bit. Maybe there's more to it though, I haven't looked at the other videos yet.
Curious to see where it goes.