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* Internally use events to connect Node#accGetAttribute and Node#accExecuteAction
* Allows run before and after default handler
* Add default handlers in the constructor to ensure event order

alternativeTextalternateText

Add it to Canvas and ImageView
Maybe add it to Labeled , ImageView, and Labeled (Label, Button, Cells, etc)

- Pro: easy to provide a more descriptive text than what is in textProperty.
- Con: not sure that is common case
- Con: that can be done using the event
- Con: can be added later

Priority: alternativeTextalternateText() has the highest priority of all (beats, text and promtText).

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