Flexbox has been supported pretty much everywhere for many many years. Same goes for the CSS units I could see. Which browsers were you thinking of? Async of N

Flexbox has been supported pretty much everywhere for many many years. Same goes for the CSS units I could see. Which browsers were you thinking of? Async of Node is a feature, and you can write it like it is sync with async / await these days so there is nothing inconvenient about it (anymore - I used to hate callback hell back in the day).