Could css pseudo elements ::before and ::after be used without selecting any html tags?

Question

E.g *, *:: before, *::after. Like that just don't understand.

Answer 1

you cannot use before and after pseudo element without selecting at least one element (before and after what if not?)

however, with * you select all elements... so your before/after rules will apply to all element, unless you overide that later with higher precedence ^^

Answer 2

Alright thanks very much,👍

Answer 3

I now understand