I am curious if the CSS standard includes definitions for "functions"; I have not come across any information about them on w3schools or other sources.
When I refer to "functions," I am talking about calls such as rgb(int, int, int)
or url(string)
that are used in CSS declarations. Although they resemble functions, they are never invoked as such.
In regular CSS usage, are they commonly referred to as "functions" or are they considered just like any other values in declarations?