from a professional designer, I’m yet to come across one that doesn’t care exactly what size a button is. Does such a creature even exist?
rems and ems, and why you probably don’t need them
David Gilbertson

design encompasses many things. i take this to mean “visual designer”. if so, and if the medium for which they are designing is the web, and “exact” is a criteria, then they clearly do not understand the medium. and your point seems to imply that exact is a criteria, is possible, and is useful or beneficial in some way.

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