This is a really in-depth explanation from Bramus of the upcoming
@layer rules in CSS, from the brilliant minds of Miriam, fantasai and Tab.
Basically, you’ll be able to scope styles, and you get to define the context for that scoping. So all those CSS-in-JS folks who don’t appreciate the cascade will have a mechanism to get encapsulated styles.
I can see this being very handy for big complex codebases with lots of people on the team.