CSS is evaluated (probably) in some sort of event loop in the browser - you can also evaluate the code I included above in an event loop - there is nothing inhe

CSS is evaluated (probably) in some sort of event loop in the browser - you can also evaluate the code I included above in an event loop - there is nothing inherently instantaneous or continuous about CSS and, given that it is deterministic, it's only actually recalculated on certain event triggers.