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diff --git a/accessible/mac/MOXAccessibleProtocol.h b/accessible/mac/MOXAccessibleProtocol.h
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+/* clang-format off */
+/* -*- Mode: Objective-C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* clang-format on */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "SDKDeclarations.h"
+
+@protocol MOXTextMarkerSupport;
+@protocol mozAccessible;
+
+// This protocol's primary use is for abstracting the NSAccessibility informal
+// protocol into a formal internal API. Conforming classes get to choose a
+// subset of the optional methods to implement. Those methods will be mapped to
+// NSAccessibility attributes or actions. A conforming class can implement
+// moxBlockSelector to control which of its implemented methods should be
+// exposed to NSAccessibility.
+
+@protocol MOXAccessible
+
+// The deepest descendant of the accessible subtree that contains the specified
+// point. Forwarded from accessibilityHitTest.
+- (id _Nullable)moxHitTest:(NSPoint)point;
+
+// The deepest descendant of the accessible subtree that has the focus.
+// Forwarded from accessibilityFocusedUIElement.
+- (id _Nullable)moxFocusedUIElement;
+
+// Sends a notification to any observing assistive applications.
+- (void)moxPostNotification:(NSString* _Nonnull)notification;
+
+- (void)moxPostNotification:(NSString* _Nonnull)notification
+               withUserInfo:(NSDictionary* _Nullable)userInfo;
+
+// Return YES if selector should be considered not supported.
+// Used in implementations such as:
+// - accessibilityAttributeNames
+// - accessibilityActionNames
+// - accessibilityIsAttributeSettable
+- (BOOL)moxBlockSelector:(SEL _Nonnull)selector;
+
+// Returns a list of all children, doesn't do ignore filtering.
+- (NSArray* _Nullable)moxChildren;
+
+// Returns our parent, doesn't do ignore filtering.
+- (id<mozAccessible> _Nullable)moxParent;
+
+// This is called by isAccessibilityElement. If a subclass wants
+// to alter the isAccessibilityElement return value, it must
+// override this and not isAccessibilityElement directly.
+- (BOOL)moxIgnoreWithParent:(id<MOXAccessible> _Nullable)parent;
+
+// Should the child be ignored. This allows subclasses to determine
+// what kinds of accessibles are valid children. This causes the child
+// to be skipped, but the unignored descendants will be added to the
+// container in the default children getter.
+- (BOOL)moxIgnoreChild:(id<MOXAccessible> _Nullable)child;
+
+// Return text delegate if it exists.
+- (id<MOXTextMarkerSupport> _Nullable)moxTextMarkerDelegate;
+
+// Return true if this accessible is a live region
+- (BOOL)moxIsLiveRegion;
+
+// Find the nearest ancestor that returns true with the given block function
+- (id<MOXAccessible> _Nullable)moxFindAncestor:
+    (BOOL (^_Nonnull)(id<MOXAccessible> _Nonnull moxAcc,
+                      BOOL* _Nonnull stop))findBlock;
+
+@optional
+
+#pragma mark - AttributeGetters
+
+// AXChildren
+- (NSArray* _Nullable)moxUnignoredChildren;
+
+// AXParent
+- (id _Nullable)moxUnignoredParent;
+
+// AXRole
+- (NSString* _Nullable)moxRole;
+
+// AXRoleDescription
+- (NSString* _Nullable)moxRoleDescription;
+
+// AXSubrole
+- (NSString* _Nullable)moxSubrole;
+
+// AXTitle
+- (NSString* _Nullable)moxTitle;
+
+// AXDescription
+- (NSString* _Nullable)moxLabel;
+
+// AXHelp
+- (NSString* _Nullable)moxHelp;
+
+// AXValue
+- (id _Nullable)moxValue;
+
+// AXValueDescription
+- (NSString* _Nullable)moxValueDescription;
+
+// AXSize
+- (NSValue* _Nullable)moxSize;
+
+// AXPosition
+- (NSValue* _Nullable)moxPosition;
+
+// AXEnabled
+- (NSNumber* _Nullable)moxEnabled;
+
+// AXFocused
+- (NSNumber* _Nullable)moxFocused;
+
+// AXWindow
+- (id _Nullable)moxWindow;
+
+// AXFrame
+- (NSValue* _Nullable)moxFrame;
+
+// AXTitleUIElement
+- (id _Nullable)moxTitleUIElement;
+
+// AXTopLevelUIElement
+- (id _Nullable)moxTopLevelUIElement;
+
+// AXHasPopup
+- (NSNumber* _Nullable)moxHasPopup;
+
+// AXARIACurrent
+- (NSString* _Nullable)moxARIACurrent;
+
+// AXSelected
+- (NSNumber* _Nullable)moxSelected;
+
+// AXRequired
+- (NSNumber* _Nullable)moxRequired;
+
+// AXElementBusy
+- (NSNumber* _Nullable)moxElementBusy;
+
+// AXLinkedUIElements
+- (NSArray* _Nullable)moxLinkedUIElements;
+
+// AXARIAControls
+- (NSArray* _Nullable)moxARIAControls;
+
+// AXDOMIdentifier
+- (NSString* _Nullable)moxDOMIdentifier;
+
+// AXURL
+- (NSURL* _Nullable)moxURL;
+
+// AXLinkUIElements
+- (NSArray* _Nullable)moxLinkUIElements;
+
+// AXPopupValue
+- (NSString* _Nullable)moxPopupValue;
+
+// AXVisited
+- (NSNumber* _Nullable)moxVisited;
+
+// AXExpanded
+- (NSNumber* _Nullable)moxExpanded;
+
+// AXMain
+- (NSNumber* _Nullable)moxMain;
+
+// AXMinimized
+- (NSNumber* _Nullable)moxMinimized;
+
+// AXSelectedChildren
+- (NSArray* _Nullable)moxSelectedChildren;
+
+// AXTabs
+- (NSArray* _Nullable)moxTabs;
+
+// AXContents
+- (NSArray* _Nullable)moxContents;
+
+// AXOrientation
+- (NSString* _Nullable)moxOrientation;
+
+// AXMenuItemMarkChar
+- (NSString* _Nullable)moxMenuItemMarkChar;
+
+// AXLoaded
+- (NSNumber* _Nullable)moxLoaded;
+
+// AXLoadingProgress
+- (NSNumber* _Nullable)moxLoadingProgress;
+
+// AXMinValue
+- (id _Nullable)moxMinValue;
+
+// AXMaxValue
+- (id _Nullable)moxMaxValue;
+
+// Webkit also implements the following:
+// // AXCaretBrowsingEnabled
+// - (NSString* _Nullable)moxCaretBrowsingEnabled;
+
+// // AXLayoutCount
+// - (NSString* _Nullable)moxLayoutCount;
+
+// // AXWebSessionID
+// - (NSString* _Nullable)moxWebSessionID;
+
+// // AXPreventKeyboardDOMEventDispatch
+// - (NSString* _Nullable)moxPreventKeyboardDOMEventDispatch;
+
+// Table Attributes
+
+// AXRowCount
+- (NSNumber* _Nullable)moxRowCount;
+
+// AXColumnCount
+- (NSNumber* _Nullable)moxColumnCount;
+
+// AXRows
+- (NSArray* _Nullable)moxRows;
+
+// AXColumns
+- (NSArray* _Nullable)moxColumns;
+
+// AXIndex
+- (NSNumber* _Nullable)moxIndex;
+
+// AXRowIndexRange
+- (NSValue* _Nullable)moxRowIndexRange;
+
+// AXColumnIndexRange
+- (NSValue* _Nullable)moxColumnIndexRange;
+
+// AXRowHeaderUIElements
+- (NSArray* _Nullable)moxRowHeaderUIElements;
+
+// AXColumnHeaderUIElements
+- (NSArray* _Nullable)moxColumnHeaderUIElements;
+
+// AXIdentifier
+- (NSString* _Nullable)moxIdentifier;
+
+// AXVisibleChildren
+- (NSArray* _Nullable)moxVisibleChildren;
+
+// Outline Attributes
+
+// AXDisclosing
+- (NSNumber* _Nullable)moxDisclosing;
+
+// AXDisclosedByRow
+- (id _Nullable)moxDisclosedByRow;
+
+// AXDisclosureLevel
+- (NSNumber* _Nullable)moxDisclosureLevel;
+
+// AXDisclosedRows
+- (NSArray* _Nullable)moxDisclosedRows;
+
+// AXSelectedRows
+- (NSArray* _Nullable)moxSelectedRows;
+
+// Math Attributes
+
+// AXMathRootRadicand
+- (id _Nullable)moxMathRootRadicand;
+
+// AXMathRootIndex
+- (id _Nullable)moxMathRootIndex;
+
+// AXMathFractionNumerator
+- (id _Nullable)moxMathFractionNumerator;
+
+// AXMathFractionDenominator
+- (id _Nullable)moxMathFractionDenominator;
+
+// AXMathLineThickness
+- (NSNumber* _Nullable)moxMathLineThickness;
+
+// AXMathBase
+- (id _Nullable)moxMathBase;
+
+// AXMathSubscript
+- (id _Nullable)moxMathSubscript;
+
+// AXMathSuperscript
+- (id _Nullable)moxMathSuperscript;
+
+// AXMathUnder
+- (id _Nullable)moxMathUnder;
+
+// AXMathOver
+- (id _Nullable)moxMathOver;
+
+// AXInvalid
+- (NSString* _Nullable)moxInvalid;
+
+// AXSelectedText
+- (NSString* _Nullable)moxSelectedText;
+
+// AXSelectedTextRange
+- (NSValue* _Nullable)moxSelectedTextRange;
+
+// AXNumberOfCharacters
+- (NSNumber* _Nullable)moxNumberOfCharacters;
+
+// AXVisibleCharacterRange
+- (NSValue* _Nullable)moxVisibleCharacterRange;
+
+// AXInsertionPointLineNumber
+- (NSNumber* _Nullable)moxInsertionPointLineNumber;
+
+// AXEditableAncestor
+- (id _Nullable)moxEditableAncestor;
+
+// AXHighestEditableAncestor
+- (id _Nullable)moxHighestEditableAncestor;
+
+// AXFocusableAncestor
+- (id _Nullable)moxFocusableAncestor;
+
+// AXARIAAtomic
+- (NSNumber* _Nullable)moxARIAAtomic;
+
+// AXARIALive
+- (NSString* _Nullable)moxARIALive;
+
+// AXARIARelevant
+- (NSString* _Nullable)moxARIARelevant;
+
+// AXMozDebugDescription
+- (NSString* _Nullable)moxMozDebugDescription;
+
+#pragma mark - AttributeSetters
+
+// AXDisclosing
+- (void)moxSetDisclosing:(NSNumber* _Nullable)disclosing;
+
+// AXValue
+- (void)moxSetValue:(id _Nullable)value;
+
+// AXFocused
+- (void)moxSetFocused:(NSNumber* _Nullable)focused;
+
+// AXSelected
+- (void)moxSetSelected:(NSNumber* _Nullable)selected;
+
+// AXSelectedChildren
+- (void)moxSetSelectedChildren:(NSArray* _Nullable)selectedChildren;
+
+// AXSelectedText
+- (void)moxSetSelectedText:(NSString* _Nullable)selectedText;
+
+// AXSelectedTextRange
+- (void)moxSetSelectedTextRange:(NSValue* _Nullable)selectedTextRange;
+
+// AXVisibleCharacterRange
+- (void)moxSetVisibleCharacterRange:(NSValue* _Nullable)visibleCharacterRange;
+
+#pragma mark - Actions
+
+// AXPress
+- (void)moxPerformPress;
+
+// AXShowMenu
+- (void)moxPerformShowMenu;
+
+// AXScrollToVisible
+- (void)moxPerformScrollToVisible;
+
+// AXIncrement
+- (void)moxPerformIncrement;
+
+// AXDecrement
+- (void)moxPerformDecrement;
+
+#pragma mark - ParameterizedAttributeGetters
+
+// AXLineForIndex
+- (NSNumber* _Nullable)moxLineForIndex:(NSNumber* _Nonnull)index;
+
+// AXRangeForLine
+- (NSValue* _Nullable)moxRangeForLine:(NSNumber* _Nonnull)line;
+
+// AXStringForRange
+- (NSString* _Nullable)moxStringForRange:(NSValue* _Nonnull)range;
+
+// AXRangeForPosition
+- (NSValue* _Nullable)moxRangeForPosition:(NSValue* _Nonnull)position;
+
+// AXRangeForIndex
+- (NSValue* _Nullable)moxRangeForIndex:(NSNumber* _Nonnull)index;
+
+// AXBoundsForRange
+- (NSValue* _Nullable)moxBoundsForRange:(NSValue* _Nonnull)range;
+
+// AXRTFForRange
+- (NSData* _Nullable)moxRTFForRange:(NSValue* _Nonnull)range;
+
+// AXStyleRangeForIndex
+- (NSValue* _Nullable)moxStyleRangeForIndex:(NSNumber* _Nonnull)index;
+
+// AXAttributedStringForRange
+- (NSAttributedString* _Nullable)moxAttributedStringForRange:
+    (NSValue* _Nonnull)range;
+
+// AXUIElementsForSearchPredicate
+- (NSArray* _Nullable)moxUIElementsForSearchPredicate:
+    (NSDictionary* _Nonnull)searchPredicate;
+
+// AXUIElementCountForSearchPredicate
+- (NSNumber* _Nullable)moxUIElementCountForSearchPredicate:
+    (NSDictionary* _Nonnull)searchPredicate;
+
+// AXCellForColumnAndRow
+- (id _Nullable)moxCellForColumnAndRow:(NSArray* _Nonnull)columnAndRow;
+
+// AXIndexForChildUIElement
+- (NSNumber* _Nullable)moxIndexForChildUIElement:(id _Nonnull)child;
+
+@end
+
+// This protocol maps text marker and text marker range parameters to
+// methods. It is implemented by a delegate of a MOXAccessible.
+@protocol MOXTextMarkerSupport
+
+#pragma mark - TextAttributeGetters
+
+// AXStartTextMarker
+- (AXTextMarkerRef _Nullable)moxStartTextMarker;
+
+// AXEndTextMarker
+- (AXTextMarkerRef _Nullable)moxEndTextMarker;
+
+// AXSelectedTextMarkerRange
+- (AXTextMarkerRangeRef _Nullable)moxSelectedTextMarkerRange;
+
+#pragma mark - ParameterizedTextAttributeGetters
+
+// AXLengthForTextMarkerRange
+- (NSNumber* _Nullable)moxLengthForTextMarkerRange:
+    (AXTextMarkerRangeRef _Nonnull)textMarkerRange;
+
+// AXStringForTextMarkerRange
+- (NSString* _Nullable)moxStringForTextMarkerRange:
+    (AXTextMarkerRangeRef _Nonnull)textMarkerRange;
+
+// AXTextMarkerRangeForUnorderedTextMarkers
+- (AXTextMarkerRangeRef _Nullable)moxTextMarkerRangeForUnorderedTextMarkers:
+    (NSArray* _Nonnull)textMarkers;
+
+// AXLeftWordTextMarkerRangeForTextMarker
+- (AXTextMarkerRangeRef _Nullable)moxLeftWordTextMarkerRangeForTextMarker:
+    (AXTextMarkerRef _Nonnull)textMarker;
+
+// AXRightWordTextMarkerRangeForTextMarker
+- (AXTextMarkerRangeRef _Nullable)moxRightWordTextMarkerRangeForTextMarker:
+    (AXTextMarkerRef _Nonnull)textMarker;
+
+// AXStartTextMarkerForTextMarkerRange
+- (AXTextMarkerRef _Nullable)moxStartTextMarkerForTextMarkerRange:
+    (AXTextMarkerRangeRef _Nonnull)textMarkerRange;
+
+// AXEndTextMarkerForTextMarkerRange
+- (AXTextMarkerRef _Nullable)moxEndTextMarkerForTextMarkerRange:
+    (AXTextMarkerRangeRef _Nonnull)textMarkerRange;
+
+// AXNextTextMarkerForTextMarker
+- (AXTextMarkerRef _Nullable)moxNextTextMarkerForTextMarker:
+    (AXTextMarkerRef _Nonnull)textMarker;
+
+// AXPreviousTextMarkerForTextMarker
+- (AXTextMarkerRef _Nullable)moxPreviousTextMarkerForTextMarker:
+    (AXTextMarkerRef _Nonnull)textMarker;
+
+// AXAttributedStringForTextMarkerRange
+- (NSAttributedString* _Nullable)moxAttributedStringForTextMarkerRange:
+    (AXTextMarkerRangeRef _Nonnull)textMarkerRange;
+
+// AXBoundsForTextMarkerRange
+- (NSValue* _Nullable)moxBoundsForTextMarkerRange:
+    (AXTextMarkerRangeRef _Nonnull)textMarkerRange;
+
+// AXIndexForTextMarker
+- (NSNumber* _Nullable)moxIndexForTextMarker:
+    (AXTextMarkerRef _Nonnull)textMarker;
+
+// AXTextMarkerForIndex
+- (AXTextMarkerRef _Nullable)moxTextMarkerForIndex:(NSNumber* _Nonnull)index;
+
+// AXUIElementForTextMarker
+- (id _Nullable)moxUIElementForTextMarker:(AXTextMarkerRef _Nonnull)textMarker;
+
+// AXTextMarkerRangeForUIElement
+- (AXTextMarkerRangeRef _Nullable)moxTextMarkerRangeForUIElement:
+    (id _Nonnull)element;
+
+// AXLineTextMarkerRangeForTextMarker
+- (AXTextMarkerRangeRef _Nullable)moxLineTextMarkerRangeForTextMarker:
+    (AXTextMarkerRef _Nonnull)textMarker;
+
+// AXLeftLineTextMarkerRangeForTextMarker
+- (AXTextMarkerRangeRef _Nullable)moxLeftLineTextMarkerRangeForTextMarker:
+    (AXTextMarkerRef _Nonnull)textMarker;
+
+// AXRightLineTextMarkerRangeForTextMarker
+- (AXTextMarkerRangeRef _Nullable)moxRightLineTextMarkerRangeForTextMarker:
+    (AXTextMarkerRef _Nonnull)textMarker;
+
+// AXParagraphTextMarkerRangeForTextMarker
+- (AXTextMarkerRangeRef _Nullable)moxParagraphTextMarkerRangeForTextMarker:
+    (AXTextMarkerRef _Nonnull)textMarker;
+
+// AXStyleTextMarkerRangeForTextMarker
+- (AXTextMarkerRangeRef _Nullable)moxStyleTextMarkerRangeForTextMarker:
+    (AXTextMarkerRef _Nonnull)textMarker;
+
+// AXMozDebugDescriptionForTextMarker
+- (NSString* _Nullable)moxMozDebugDescriptionForTextMarker:
+    (AXTextMarkerRef _Nonnull)textMarker;
+
+// AXMozDebugDescriptionForTextMarkerRange
+- (NSString* _Nullable)moxMozDebugDescriptionForTextMarkerRange:
+    (AXTextMarkerRangeRef _Nonnull)textMarkerRange;
+
+#pragma mark - TextAttributeSetters
+
+// AXSelectedTextMarkerRange
+- (void)moxSetSelectedTextMarkerRange:(id _Nullable)textMarkerRange;
+
+@end