nsIAccessibleEvent in Firefox 3.5

 An interface for accessibility events listened to
 by in-process accessibility clients, which can be used
 to find out how to get accessibility and DOM interfaces for
 the event and its target. To listen to in-process accessibility invents,
 make your object an nsIObserver, and listen for accessible-event by 
 using code something like this:
   nsCOMPtr<nsIObserverService> observerService = 
     do_GetService("@mozilla.org/observer-service;1", &rv);
   if (NS_SUCCEEDED(rv)) 
     rv = observerService->AddObserver(this, "accessible-event", PR_TRUE);

 @status UNDER_REVIEW

[scriptable, uuid(ba448f0e-a761-48c8-a0f5-1f25e23d4fe4)]

Constants

 An object has been created.

const unsigned long EVENT_DOM_CREATE = 1

 An object has been destroyed.

const unsigned long EVENT_DOM_DESTROY = 2

 An object's properties or content have changed significantly so that the
 type of object has really changed, and therefore the accessible should be 
 destroyed or recreated.

const unsigned long EVENT_DOM_SIGNIFICANT_CHANGE = 3

 A hidden object is shown -- this is a layout occurance and is thus asynchronous

const unsigned long EVENT_ASYNCH_SHOW = 4

 An object is hidden -- this is a layout occurance and is thus asynchronous

const unsigned long EVENT_ASYNCH_HIDE = 5

 An object had a significant layout change which could affect
 the type of accessible object -- this is a layout occurance and is thus asynchronous

const unsigned long EVENT_ASYNCH_SIGNIFICANT_CHANGE = 6

 The active descendant of a component has changed. The active descendant
 is used in objects with transient children.

const unsigned long EVENT_ACTIVE_DECENDENT_CHANGED = 7

 An object has received the keyboard focus.

const unsigned long EVENT_FOCUS = 8

 An object's state has changed.

const unsigned long EVENT_STATE_CHANGE = 9

 An object has changed location, shape, or size.

const unsigned long EVENT_LOCATION_CHANGE = 10

 An object's Name property has changed.

const unsigned long EVENT_NAME_CHANGE = 11

 An object's Description property has changed.

const unsigned long EVENT_DESCRIPTION_CHANGE = 12

 An object's Value property has changed.

const unsigned long EVENT_VALUE_CHANGE = 13

 An object's help has changed.

const unsigned long EVENT_HELP_CHANGE = 14

 An object's default action has changed.

const unsigned long EVENT_DEFACTION_CHANGE = 15

 An object's action has changed.

const unsigned long EVENT_ACTION_CHANGE = 16

 An object's keyboard shortcut has changed.

const unsigned long EVENT_ACCELERATOR_CHANGE = 17

 The selection within a container object has changed.

const unsigned long EVENT_SELECTION = 18

 An item within a container object has been added to the selection.

const unsigned long EVENT_SELECTION_ADD = 19

 An item within a container object has been removed from the selection.

const unsigned long EVENT_SELECTION_REMOVE = 20

 Numerous selection changes have occurred within a container object.

const unsigned long EVENT_SELECTION_WITHIN = 21

 An alert has been generated. Server applications send this event when a
 user needs to know that a user interface element has changed.

const unsigned long EVENT_ALERT = 22

 The foreground window has changed.

const unsigned long EVENT_FOREGROUND = 23

 A menu item on the menu bar has been selected.

const unsigned long EVENT_MENU_START = 24

 A menu from the menu bar has been closed.

const unsigned long EVENT_MENU_END = 25

 A pop-up menu has been displayed.

const unsigned long EVENT_MENUPOPUP_START = 26

 A pop-up menu has been closed.

const unsigned long EVENT_MENUPOPUP_END = 27

 A window has received mouse capture.

const unsigned long EVENT_CAPTURE_START = 28

 A window has lost mouse capture.

const unsigned long EVENT_CAPTURE_END = 29

 A window is being moved or resized.

const unsigned long EVENT_MOVESIZE_START = 30

 The movement or resizing of a window has finished

const unsigned long EVENT_MOVESIZE_END = 31

 A window has entered context-sensitive Help mode

const unsigned long EVENT_CONTEXTHELP_START = 32

 A window has exited context-sensitive Help mode

const unsigned long EVENT_CONTEXTHELP_END = 33

 An application is about to enter drag-and-drop mode

const unsigned long EVENT_DRAGDROP_START = 34

 An application is about to exit drag-and-drop mode

const unsigned long EVENT_DRAGDROP_END = 35

 A dialog box has been displayed

const unsigned long EVENT_DIALOG_START = 36

 A dialog box has been closed

const unsigned long EVENT_DIALOG_END = 37

 Scrolling has started on a scroll bar

const unsigned long EVENT_SCROLLING_START = 38

 Scrolling has ended on a scroll bar

const unsigned long EVENT_SCROLLING_END = 39

 A window object is about to be minimized or maximized

const unsigned long EVENT_MINIMIZE_START = 40

 A window object has been minimized or maximized

const unsigned long EVENT_MINIMIZE_END = 41

 XXX:

const unsigned long EVENT_DOCUMENT_LOAD_START = 42

 The loading of the document has completed.

const unsigned long EVENT_DOCUMENT_LOAD_COMPLETE = 43

 The document contents are being reloaded.

const unsigned long EVENT_DOCUMENT_RELOAD = 44

 The loading of the document was interrupted.

const unsigned long EVENT_DOCUMENT_LOAD_STOPPED = 45

 The document wide attributes of the document object have changed.

const unsigned long EVENT_DOCUMENT_ATTRIBUTES_CHANGED = 46

 The contents of the document have changed.

const unsigned long EVENT_DOCUMENT_CONTENT_CHANGED = 47

const unsigned long EVENT_PROPERTY_CHANGED = 48

const unsigned long EVENT_SELECTION_CHANGED = 49

 A text object's attributes changed.
 Also see EVENT_OBJECT_ATTRIBUTE_CHANGED.

const unsigned long EVENT_TEXT_ATTRIBUTE_CHANGED = 50

 The caret has moved to a new position.

const unsigned long EVENT_TEXT_CARET_MOVED = 51

 This event indicates general text changes, i.e. changes to text that is
 exposed through the IAccessibleText and IAccessibleEditableText interfaces.

const unsigned long EVENT_TEXT_CHANGED = 52

 Text was inserted.

const unsigned long EVENT_TEXT_INSERTED = 53

 Text was removed.

const unsigned long EVENT_TEXT_REMOVED = 54

 Text was updated.

const unsigned long EVENT_TEXT_UPDATED = 55

 The text selection changed.

const unsigned long EVENT_TEXT_SELECTION_CHANGED = 56

 A visibile data event indicates the change of the visual appearance
 of an accessible object.  This includes for example most of the
 attributes available via the IAccessibleComponent interface.

const unsigned long EVENT_VISIBLE_DATA_CHANGED = 57

 The caret moved from one column to the next.

const unsigned long EVENT_TEXT_COLUMN_CHANGED = 58

 The caret moved from one section to the next.

const unsigned long EVENT_SECTION_CHANGED = 59

 A table caption changed.

const unsigned long EVENT_TABLE_CAPTION_CHANGED = 60

 A table's data changed.

const unsigned long EVENT_TABLE_MODEL_CHANGED = 61

 A table's summary changed.

const unsigned long EVENT_TABLE_SUMMARY_CHANGED = 62

 A table's row description changed.

const unsigned long EVENT_TABLE_ROW_DESCRIPTION_CHANGED = 63

 A table's row header changed.

const unsigned long EVENT_TABLE_ROW_HEADER_CHANGED = 64

const unsigned long EVENT_TABLE_ROW_INSERT = 65

const unsigned long EVENT_TABLE_ROW_DELETE = 66

const unsigned long EVENT_TABLE_ROW_REORDER = 67

 A table's column description changed.

const unsigned long EVENT_TABLE_COLUMN_DESCRIPTION_CHANGED = 68

 A table's column header changed.

const unsigned long EVENT_TABLE_COLUMN_HEADER_CHANGED = 69

const unsigned long EVENT_TABLE_COLUMN_INSERT = 70

const unsigned long EVENT_TABLE_COLUMN_DELETE = 71

const unsigned long EVENT_TABLE_COLUMN_REORDER = 72

const unsigned long EVENT_WINDOW_ACTIVATE = 73

const unsigned long EVENT_WINDOW_CREATE = 74

const unsigned long EVENT_WINDOW_DEACTIVATE = 75

const unsigned long EVENT_WINDOW_DESTROY = 76

const unsigned long EVENT_WINDOW_MAXIMIZE = 77

const unsigned long EVENT_WINDOW_MINIMIZE = 78

const unsigned long EVENT_WINDOW_RESIZE = 79

const unsigned long EVENT_WINDOW_RESTORE = 80

 The ending index of this link within the containing string has changed.

const unsigned long EVENT_HYPERLINK_END_INDEX_CHANGED = 81

 The number of anchors assoicated with this hyperlink object has changed.

const unsigned long EVENT_HYPERLINK_NUMBER_OF_ANCHORS_CHANGED = 82

 The hyperlink selected state changed from selected to unselected or
 from unselected to selected.

const unsigned long EVENT_HYPERLINK_SELECTED_LINK_CHANGED = 83

 One of the links associated with the hypertext object has been activated.

const unsigned long EVENT_HYPERTEXT_LINK_ACTIVATED = 84

 One of the links associated with the hypertext object has been selected.

const unsigned long EVENT_HYPERTEXT_LINK_SELECTED = 85

 The starting index of this link within the containing string has changed.

const unsigned long EVENT_HYPERLINK_START_INDEX_CHANGED = 86

 Focus has changed from one hypertext object to another, or focus moved
 from a non-hypertext object to a hypertext object, or focus moved from a
 hypertext object to a non-hypertext object.

const unsigned long EVENT_HYPERTEXT_CHANGED = 87

 The number of hyperlinks associated with a hypertext object changed.

const unsigned long EVENT_HYPERTEXT_NLINKS_CHANGED = 88

 An object's attributes changed. Also see EVENT_TEXT_ATTRIBUTE_CHANGED.

const unsigned long EVENT_OBJECT_ATTRIBUTE_CHANGED = 89

 A slide changed in a presentation document or a page boundary was
 crossed in a word processing document.

const unsigned long EVENT_PAGE_CHANGED = 90

 Used internally in Gecko.

const unsigned long EVENT_INTERNAL_LOAD = 91

 An object's children have changed

const unsigned long EVENT_REORDER = 92

 Help make sure event map does not get out-of-line.

const unsigned long EVENT_LAST_ENTRY = 93

Attributes

 The nsIAccessible associated with the event.
 May return null if no accessible is available

readonly attribute nsIAccessible accessible

 The nsIAccessibleDocument that the event target nsIAccessible
 resides in. This can be used to get the DOM window,
 the DOM document and the window handler, among other things.

readonly attribute nsIAccessibleDocument accessibleDocument

 The nsIDOMNode associated with the event
 May return null if accessible for event has been shut down

readonly attribute nsIDOMNode DOMNode

 The type of event, based on the enumerated event values
 defined in this interface.

readonly attribute unsigned long eventType

 Returns true if the event was caused by explicit user input,
 as opposed to purely originating from a timer or mouse movement

attribute boolean isFromUserInput