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diff --git a/accessible/mac/mozAccessibleProtocol.h b/accessible/mac/mozAccessibleProtocol.h
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+++ b/accessible/mac/mozAccessibleProtocol.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/. */
+
+#import <Cocoa/Cocoa.h>
+
+#import "mozView.h"
+
+/* This protocol's primary use is so widget/cocoa can talk back to us
+   properly.
+
+   ChildView owns the topmost mozRootAccessible, and needs to take care of
+   setting up that parent/child relationship.
+
+   This protocol is thus used to make sure it knows it's talking to us, and not
+   just some random |id|.
+*/
+
+@protocol mozAccessible <NSObject>
+
+// returns whether this accessible is the root accessible. there is one
+// root accessible per window.
+- (BOOL)isRoot;
+
+// some mozAccessibles implement accessibility support in place of another
+// object. for example, ChildView gets its support from us.
+//
+// instead of returning a mozAccessible to the OS when it wants an object, we
+// need to pass the view we represent, so the OS doesn't get confused and think
+// we return some random object.
+- (BOOL)hasRepresentedView;
+- (id)representedView;
+
+/*** general ***/
+
+// returns the accessible at the specified point.
+- (id)accessibilityHitTest:(NSPoint)point;
+
+// whether this element should be exposed to platform.
+- (BOOL)isAccessibilityElement;
+
+// currently focused UI element (possibly a child accessible)
+- (id)accessibilityFocusedUIElement;
+
+/*** attributes ***/
+
+// all supported attributes
+- (NSArray*)accessibilityAttributeNames;
+
+// value for given attribute.
+- (id)accessibilityAttributeValue:(NSString*)attribute;
+
+// whether a particular attribute can be modified
+- (BOOL)accessibilityIsAttributeSettable:(NSString*)attribute;
+
+/*** actions ***/
+
+- (NSArray*)accessibilityActionNames;
+- (NSString*)accessibilityActionDescription:(NSString*)action;
+- (void)accessibilityPerformAction:(NSString*)action;
+
+@end