Except that syntax requires infinite lookahead to parse.
It's feasible when you're running a preprocessor on your own code one time, but not feasible for the browser to do on unknown code on every stylesheet it encounters.
It's feasible when you're running a preprocessor on your own code one time, but not feasible for the browser to do on unknown code on every stylesheet it encounters.
But finding 3 other solutions (because of "performance"), not promoting them through transpiling, and then forcing them on web devs seems... googley. Not the first improvement they forced down our throats and unfortunately not the last. /rant