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diff --git a/accessible/ipc/other/RemoteAccessible.h b/accessible/ipc/other/RemoteAccessible.h
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+++ b/accessible/ipc/other/RemoteAccessible.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#ifndef mozilla_a11y_RemoteAccessible_h
+#define mozilla_a11y_RemoteAccessible_h
+
+#include "LocalAccessible.h"
+#include "mozilla/a11y/RemoteAccessibleBase.h"
+#include "mozilla/a11y/Role.h"
+#include "nsIAccessibleText.h"
+#include "nsIAccessibleTypes.h"
+#include "nsString.h"
+#include "nsTArray.h"
+#include "nsRect.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * Functionality common across Linux and macOS for an accessibility tree node
+ * that originated in the parent process.
+ */
+class RemoteAccessible : public RemoteAccessibleBase<RemoteAccessible> {
+ public:
+  RemoteAccessible(uint64_t aID, RemoteAccessible* aParent,
+                   DocAccessibleParent* aDoc, role aRole, AccType aType,
+                   AccGenericType aGenericTypes, uint8_t aRoleMapEntryIndex)
+      : RemoteAccessibleBase(aID, aParent, aDoc, aRole, aType, aGenericTypes,
+                             aRoleMapEntryIndex) {
+    MOZ_COUNT_CTOR(RemoteAccessible);
+  }
+
+  MOZ_COUNTED_DTOR(RemoteAccessible)
+
+#include "mozilla/a11y/RemoteAccessibleShared.h"
+
+  virtual uint32_t CharacterCount() const override;
+
+  LayoutDeviceIntRect TextBounds(
+      int32_t aStartOffset, int32_t aEndOffset,
+      uint32_t aCoordType =
+          nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE) override;
+
+  LayoutDeviceIntRect CharBounds(int32_t aOffset, uint32_t aCoordType) override;
+
+  virtual already_AddRefed<AccAttributes> TextAttributes(
+      bool aIncludeDefAttrs, int32_t aOffset, int32_t* aStartOffset,
+      int32_t* aEndOffset) override;
+
+  virtual already_AddRefed<AccAttributes> DefaultTextAttributes() override;
+
+  virtual uint32_t StartOffset() override;
+  virtual uint32_t EndOffset() override;
+
+  virtual int32_t LinkIndexAtOffset(uint32_t aOffset) override;
+
+  virtual bool DoAction(uint8_t aIndex) const override;
+  virtual uint8_t ActionCount() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual KeyBinding AccessKey() const override;
+
+  virtual void SelectedItems(nsTArray<Accessible*>* aSelectedItems) override;
+  virtual uint32_t SelectedItemCount() override;
+  virtual Accessible* GetSelectedItem(uint32_t aIndex) override;
+  virtual bool IsItemSelected(uint32_t aIndex) override;
+  virtual bool AddItemToSelection(uint32_t aIndex) override;
+  virtual bool RemoveItemFromSelection(uint32_t aIndex) override;
+  virtual bool SelectAll() override;
+  virtual bool UnselectAll() override;
+
+  virtual nsAtom* LandmarkRole() const override;
+
+  virtual int32_t SelectionCount() override;
+
+  using RemoteAccessibleBase<RemoteAccessible>::SelectionBoundsAt;
+  bool SelectionBoundsAt(int32_t aSelectionNum, nsString& aData,
+                         int32_t* aStartOffset, int32_t* aEndOffset);
+
+  virtual bool TableIsProbablyForLayout() override;
+
+  /**
+   * Get all relations for this accessible.
+   */
+  void Relations(nsTArray<RelationType>* aTypes,
+                 nsTArray<nsTArray<RemoteAccessible*>>* aTargetSets) const;
+
+ protected:
+  explicit RemoteAccessible(DocAccessibleParent* aThisAsDoc)
+      : RemoteAccessibleBase(aThisAsDoc) {
+    MOZ_COUNT_CTOR(RemoteAccessible);
+  }
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// RemoteAccessible downcasting method
+
+inline RemoteAccessible* Accessible::AsRemote() {
+  return IsRemote() ? static_cast<RemoteAccessible*>(this) : nullptr;
+}
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif