If you open the SwingSet2 "Tree Demo" tab (the last one on the right), and navigate to the tree with VoiceOver on:
- The tree is reported as a "Browser" component, which I think is incorrect (it should be "Outline"). Here are links to the respecting docs. for browser vs outline:

https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/OutlineView/OutlineView.html#//apple_ref/doc/uid/10000023-BCIBJFCI

https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Browser/Browser.html#//apple_ref/doc/uid/10000018-BCIGGGAJ

- VoiceOver will not "speak" selected items when changing the selection (with cursor up/down).
- When navigating into the tree with Ctrl-Option-Shift-Down Arrow, VoiceOver speak "Column 1 of 0" and does not let you navigate to any node into tree.