I didn’t want to post on pinned post, but kudos for the great skeleton. I did notice one minor typo in a comment (sorry, was busy and will have to find it again to report it, although it is a very minor nit), but I think that the site and theme skeletons are a very well done.
The only concern I might have, would be with validator (w3c’s validator) complaining about
minimum-scale=1.0 in the
viewport meta element. I don’t know if w3c is just differing in opinion on this one, or if it a no longer best practice, or what. I just thought I’d mention it, since I ran into it.
All in all, great work. Thank you to all involved.