Previous discussion:
https://news.ycombinator.com/item?id=37715703
Nice idea, I'd still like to see some Lighthouse benchmarks for this compared to regular CSS (sorry, would love to contribute as the idea is lovely, but workday was enough time at the large computer for me today)
OTOH, this looks to me like it could invite yank and FOUC, OTOH the repo says performance is good and no flickering. I mean, it's certainly doable to make this performant and unnoticeable.
Kudos for this great idea.