How can a value be a value in itself?

Question

css

display is a property, right?!
This property has several values ​​(eg Grid and Flex).
Display: flex/grid
Then Grid and Flex can no longer be values ​​because they are properties...
Both Flex and Grid can no longer be properties right (because they are values)?
flex: initial/unset/inherit; value at value???

Answer 1

No, not correct. The css interpreter does not work by keywords, otherwise no one would allow classes to be called properties