[Scenario] When an accessibility subtree is removed [ATK/AT-SPI event] children_changed::remove [Mac OS X Notification] AXUIElementDestroyed If in a live region, AXLiveRegionChanged [MSAA] 
EVENT_OBJECT_REORDER The MSAA event called EVENT_OBJECT_DESTROY is not used because this has a history of stability issues and assistive technology avoids it. In any case, from the user's point of view, there is no difference between something that is hidden or destroyed.