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Supplement to the normal tooltip processing of the user agent.
drop the above sentence
Change "Popup that displays a description for an element when a user passes over or rests on that element." to "Popup that displays a description for an element when a user hovers over or focuses on that element."
Add a note: "The tooltip may appear immediately or there may be a small delay before the tooltip appears"
"If more then one widget uses the same keys," to "If nested widgets use the same keys,"