Wasn't familiar with it, looks interesting.

Some animations are painfully slow, though. After opening a menu[0], it takes a long time to close once you click outside.

How well does it work without JS? I assume that's how the ripple effect is implemented.

[0] - https://www.beercss.com/#:~:text=Menus,-code

Edit: they have documented what works and what doesn't with JS disabled here : https://github.com/beercss/beercss/blob/main/docs/JAVASCRIPT...

That file hasn't been updated in a while. Not sure if nothing has changed since then, or if it's outdated.