@tk recently I have been having it explain W3C specifications to me and come up with solutions that incorporate multiple ones into one working solution, along with implementing code. It has worked REALLY good for that, probably because W3C docs are very verbose (they are also really long and numerous, hence needing help.)

I've been following up and verifying in docs that it is interpreting them correctly and it does make mistakes but overall it has been a massive time saver.