What happens in the case where you have two properties, A and B that "work together"? For example disable A and visually the element stays the same, disable B a

What happens in the case where you have two properties, A and B that "work together"? For example disable A and visually the element stays the same, disable B and visually the element stays the same, but disable A and B and the element changes (and based on the way you regress it might falsely tell you that A or B is effective depending which one you disable latest).