14677522_ser_Agent_Implementation_Guide_events_to_be_fired_in_each_API_ATK_AT_SPI_event
[Scenario] When an accessibility subtree is removed [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. [Mac OS X Notification] AXUIElementDestroyed If in a live region, AXLiveRegionChanged [ATK/AT-SPI event] 
children_changed::remove
WAI-ARIA 1.0 User Agent Implementation Guide