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diff --git a/accessible/generic/OuterDocAccessible.h b/accessible/generic/OuterDocAccessible.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_OUTERDOCACCESSIBLE_H_
+#define MOZILLA_A11Y_OUTERDOCACCESSIBLE_H_
+
+#include "AccessibleWrap.h"
+
+namespace mozilla {
+
+namespace dom {
+class BrowserBridgeChild;
+}
+
+namespace a11y {
+class DocAccessibleParent;
+
+/**
+ * Used for <browser>, <frame>, <iframe>, <page> or editor> elements.
+ *
+ * In these variable names, "outer" relates to the OuterDocAccessible as
+ * opposed to the DocAccessibleWrap which is "inner". The outer node is
+ * a something like tags listed above, whereas the inner node corresponds to
+ * the inner document root.
+ */
+
+class OuterDocAccessible final : public AccessibleWrap {
+ public:
+  OuterDocAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(OuterDocAccessible, AccessibleWrap)
+
+  DocAccessibleParent* RemoteChildDoc() const;
+
+  /**
+   * For iframes in a content process which will be rendered in another content
+   * process, tell the parent process about this OuterDocAccessible
+   * so it can link the trees together when the embedded document is added.
+   * Note that an OuterDocAccessible can be created before the
+   * BrowserBridgeChild or vice versa. Therefore, this must be conditionally
+   * called when either of these is created.
+   */
+  void SendEmbedderAccessible(dom::BrowserBridgeChild* aBridge);
+
+  Maybe<nsMargin> GetCrossDocOffset() { return mCrossDocOffset; }
+
+  void SetCrossDocOffset(nsMargin aMargin) { mCrossDocOffset = Some(aMargin); }
+
+  // LocalAccessible
+  virtual void Shutdown() override;
+  virtual mozilla::a11y::role NativeRole() const override;
+  virtual LocalAccessible* LocalChildAtPoint(
+      int32_t aX, int32_t aY, EWhichChildAtPoint aWhichChild) override;
+
+  virtual bool InsertChildAt(uint32_t aIdx, LocalAccessible* aChild) override;
+  virtual bool RemoveChild(LocalAccessible* aAccessible) override;
+  virtual bool IsAcceptableChild(nsIContent* aEl) const override;
+
+  virtual uint32_t ChildCount() const override;
+
+  // Accessible
+  virtual Accessible* ChildAt(uint32_t aIndex) const override;
+  virtual Accessible* ChildAtPoint(int32_t aX, int32_t aY,
+                                   EWhichChildAtPoint aWhichChild) override;
+
+ protected:
+  virtual ~OuterDocAccessible() override;
+  Maybe<nsMargin> mCrossDocOffset;
+};
+
+inline OuterDocAccessible* LocalAccessible::AsOuterDoc() {
+  return IsOuterDoc() ? static_cast<OuterDocAccessible*>(this) : nullptr;
+}
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif