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diff --git a/accessible/generic/BaseAccessibles.h b/accessible/generic/BaseAccessibles.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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_BaseAccessibles_h__
+#define mozilla_a11y_BaseAccessibles_h__
+
+#include "AccessibleWrap.h"
+#include "HyperTextAccessibleWrap.h"
+
+class nsIContent;
+
+/**
+ * This file contains a number of classes that are used as base
+ *  classes for the different accessibility implementations of
+ *  the HTML and XUL widget sets.  --jgaunt
+ */
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * Leaf version of DOM Accessible -- has no children
+ */
+class LeafAccessible : public AccessibleWrap {
+ public:
+  LeafAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  // nsISupports
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(LeafAccessible, AccessibleWrap)
+
+  // Accessible
+  virtual Accessible* ChildAtPoint(int32_t aX, int32_t aY,
+                                   EWhichChildAtPoint aWhichChild) override;
+  bool InsertChildAt(uint32_t aIndex, Accessible* aChild) final;
+  bool RemoveChild(Accessible* aChild) final;
+
+  virtual bool IsAcceptableChild(nsIContent* aEl) const override;
+
+ protected:
+  virtual ~LeafAccessible() {}
+};
+
+/**
+ * Used for text or image accessible nodes contained by link accessibles or
+ * accessibles for nodes with registered click event handler. It knows how to
+ * report the state of the host link (traveled or not) and can activate (click)
+ * the host accessible programmatically.
+ */
+class LinkableAccessible : public AccessibleWrap {
+ public:
+  enum { eAction_Jump = 0 };
+
+  LinkableAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : AccessibleWrap(aContent, aDoc) {}
+
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(LinkableAccessible, AccessibleWrap)
+
+  // Accessible
+  virtual void Value(nsString& aValue) const override;
+  virtual uint64_t NativeLinkState() const override;
+  virtual void TakeFocus() const override;
+
+  // ActionAccessible
+  virtual uint8_t ActionCount() const override;
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+  virtual bool DoAction(uint8_t index) const override;
+  virtual KeyBinding AccessKey() const override;
+
+  // ActionAccessible helpers
+  const Accessible* ActionWalk(bool* aIsLink = nullptr,
+                               bool* aIsOnclick = nullptr,
+                               bool* aIsLabelWithControl = nullptr) const;
+  // HyperLinkAccessible
+  virtual already_AddRefed<nsIURI> AnchorURIAt(
+      uint32_t aAnchorIndex) const override;
+
+ protected:
+  virtual ~LinkableAccessible() {}
+};
+
+/**
+ * A simple accessible that gets its enumerated role.
+ */
+template <a11y::role R>
+class EnumRoleAccessible : public AccessibleWrap {
+ public:
+  EnumRoleAccessible(nsIContent* aContent, DocAccessible* aDoc)
+      : AccessibleWrap(aContent, aDoc) {}
+
+  NS_IMETHOD QueryInterface(REFNSIID aIID, void** aPtr) override {
+    return Accessible::QueryInterface(aIID, aPtr);
+  }
+
+  // Accessible
+  virtual a11y::role NativeRole() const override { return R; }
+
+ protected:
+  virtual ~EnumRoleAccessible() {}
+};
+
+/**
+ * A wrapper accessible around native accessible to connect it with
+ * crossplatform accessible tree.
+ */
+class DummyAccessible : public AccessibleWrap {
+ public:
+  explicit DummyAccessible(DocAccessible* aDocument = nullptr)
+      : AccessibleWrap(nullptr, aDocument) {
+    // IsDefunct() asserts if mContent is null, which is always true for
+    // DummyAccessible. We can prevent this by setting eSharedNode.
+    mStateFlags |= eSharedNode;
+  }
+
+  uint64_t NativeState() const final;
+  uint64_t NativeInteractiveState() const final;
+  uint64_t NativeLinkState() const final;
+  bool NativelyUnavailable() const final;
+  void ApplyARIAState(uint64_t* aState) const final;
+
+ protected:
+  virtual ~DummyAccessible() {}
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif