Per PFWG's Formal Objection  remove the sentence:
"User Agents are encouraged to expose the full semantics of hidden elements to Assistive Technology when such elements are referenced from WAI-ARIA attributes such as aria-describedby."
I'll take this one. Resolution of this bug will depend on the outcome of 18744 and 18745.
(In reply to comment #1)
> I'll take this one. Resolution of this bug will depend on the outcome of 18744
> and 18745.
I believe that is the other way around Ted. The resolution will depend on outcome of the Formal Objection.
Hopefully it will all be resolved amicably.
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Change Description: https://github.com/w3c/html/commit/ca896aab1f7a3ad54b36721c6a32da5cf243d65f
Rationale: Adjusted spec text per the chairs' request. The sentence has been removed.