:active odpowiada za "aktywność" elementu, gdy się go kliknie na urządzeniu mobilnym?
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Jak zawsze, pomaga dokumentacja:
The
:active
pseudo-class is defined to match an element while an element is being activated by the user.To determine whether a particular element is being activated [...], use the first relevant entry in the following list.
[...]
- If the element is being actively pointed at
[...]
An element is said to be being actively pointed at [...] (e.g. [...] while the finger is touching the display surface).
tl;dr tak