The question of whether CSS is a programming language serves only one purpose: to demote those who write it.
There is no confusion that needs to be clarified, and no other purpose to the debate beyond the most trivial kind of pedantry.
The debate itself is an act of gatekeeping, whether intentional or not. Its only meaningful effect is to elevate some work over other work, despite their nearly identical nature.
The only meaningful function of the question is segregation. #css
