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Split these out. Add Note to the dual-state in order to disuade people from using it.
The note should be of the same form as from https://www.w3.org/Bugs/Public/show_bug.cgi?id=27277
Instead of separating, I attempted to reduce confusion and provide desired clarity with major re-write and simplification of Description, Keyboard Interaction, and WAI-ARIA Roles, States, and Properties.