CSS has supported native mixins for over a decade?!?

I don't know if I'm the first to discover this, but Christmas on a cracker if this holds up and works well... my mind is then blown that it pretty much guts the last reason to use CSS preprocessors.

And how does it support them you ask? keyframes/animation.

https://deathshadow.medium.com/css-has-supported-native-mixins-for-a-decade-e6c77fe28751