This lesson talks about input states, which as I understand is the same as CSS pseudo-classes. However, it mentions default, focused, disabled and readonly states. If I understand everything correctly, it should be :default, :focus, :disabled and :read-only according to MDN.
I feel like the lesson is either wrong or unclear, or it’s correct and I just don’t understand it. I want to either get it corrected or (if I’m wrong) get an explanation as to why I’m wrong.