Is there anything called GUI standards?

Question

GUIs are one of the important areas in most of the software products. I would like to know whether there is something called GUI Standards that defines the best practices in GUI

Answer 1

windows is originaly based on CUA

https://en.wikipedia.org/wiki/IBM_Common_User_Access

although microsoft has gone bananas since Vista, one example is the exchanged order of Edit and View menu commands in the calculator.