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Spun off from: http://www.w3.org/Bugs/Public/show_bug.cgi?id=11514#c7 http://www.w3.org/Bugs/Public/show_bug.cgi?id=14295#c4
aria-hidden is currently not correct. We (FF) only fire: IA2_EVENT_OBJECT_ATTRIBUTE_CHANGED This was the ultimate decision reached after lengthy discussion with NVDA. We continue to treat aria-hidden as a hint that AT can then use to decide what they want to convey.
For aria-activedescendant we should probably note that a focus event is fired for the child object. (see https://developer.mozilla.org/ARIA_User_Agent_Implementors_Guide#11.3.1.2_aria-activedescendant)
We have specified the focus event in section 4.3 so I would rather not repeat it here. I have added a link back to section 4.3 in the table though.
Add link to section 4.3 to activedescendant row