Or more specifically:
I personally do use "mdn" .. prefix all the time, because I'm not interested in other stuff, that is outdated or wrong.
If you need to know, if a feature is browser specific, and you should or should _not_ use it, you can use
caniuse.com and ask it. ... BTW caniuse and MDN
share database content, to create their compatibility information.
If you want to get a summary, about the web, once per week I suggest to subscribe to:
and / or
You will get (a few) duplicated links, if you subscribe to both.
I think, there is no need to create CSS specific documentation in TW. The resources I did list, are always up to date and that's really important.
have fun!
mario