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diff --git a/accessible/ipc/DocAccessibleParent.h b/accessible/ipc/DocAccessibleParent.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_DocAccessibleParent_h
+#define mozilla_a11y_DocAccessibleParent_h
+
+#include "nsAccessibilityService.h"
+#include "mozilla/a11y/PDocAccessibleParent.h"
+#include "mozilla/a11y/RemoteAccessible.h"
+#include "mozilla/dom/BrowserBridgeParent.h"
+#include "nsClassHashtable.h"
+#include "nsHashKeys.h"
+#include "nsISupportsImpl.h"
+
+namespace mozilla {
+namespace dom {
+class CanonicalBrowsingContext;
+}
+
+namespace a11y {
+
+class TextRange;
+class xpcAccessibleGeneric;
+
+/*
+ * These objects live in the main process and comunicate with and represent
+ * an accessible document in a content process.
+ */
+class DocAccessibleParent : public RemoteAccessible,
+                            public PDocAccessibleParent,
+                            public nsIMemoryReporter {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIMEMORYREPORTER
+
+ private:
+  DocAccessibleParent();
+
+ public:
+  static already_AddRefed<DocAccessibleParent> New();
+
+  /**
+   * Set this as a top level document; i.e. it is not embedded by another remote
+   * document. This also means it is a top level document in its content
+   * process.
+   * Tab documents are top level documents.
+   */
+  void SetTopLevel() {
+    mTopLevel = true;
+    mTopLevelInContentProcess = true;
+  }
+  bool IsTopLevel() const { return mTopLevel; }
+
+  /**
+   * Set this as a top level document in its content process.
+   * Note that this could be an out-of-process iframe embedded by a remote
+   * embedder document. In that case, IsToplevel() will return false, but
+   * IsTopLevelInContentProcess() will return true.
+   */
+  void SetTopLevelInContentProcess() { mTopLevelInContentProcess = true; }
+  bool IsTopLevelInContentProcess() const { return mTopLevelInContentProcess; }
+
+  /**
+   * Determine whether this is an out-of-process iframe document, embedded by a
+   * remote embedder document.
+   */
+  bool IsOOPIframeDoc() const {
+    return !mTopLevel && mTopLevelInContentProcess;
+  }
+
+  bool IsShutdown() const { return mShutdown; }
+
+  /**
+   * Mark this actor as shutdown without doing any cleanup.  This should only
+   * be called on actors that have just been initialized, so probably only from
+   * RecvPDocAccessibleConstructor.
+   */
+  void MarkAsShutdown() {
+    MOZ_ASSERT(mChildDocs.IsEmpty());
+    MOZ_ASSERT(mAccessibles.Count() == 0);
+    MOZ_ASSERT(!mBrowsingContext);
+    mShutdown = true;
+  }
+
+  void SetBrowsingContext(dom::CanonicalBrowsingContext* aBrowsingContext);
+
+  dom::CanonicalBrowsingContext* GetBrowsingContext() const {
+    return mBrowsingContext;
+  }
+
+  /*
+   * Called when a message from a document in a child process notifies the main
+   * process it is firing an event.
+   */
+  virtual mozilla::ipc::IPCResult RecvEvent(const uint64_t& aID,
+                                            const uint32_t& aType) override;
+
+  virtual mozilla::ipc::IPCResult RecvShowEvent(
+      nsTArray<AccessibleData>&& aNewTree, const bool& aEventSuppressed,
+      const bool& aComplete, const bool& aFromUser) override;
+  virtual mozilla::ipc::IPCResult RecvHideEvent(const uint64_t& aRootID,
+                                                const bool& aFromUser) override;
+  mozilla::ipc::IPCResult RecvStateChangeEvent(const uint64_t& aID,
+                                               const uint64_t& aState,
+                                               const bool& aEnabled) final;
+
+  mozilla::ipc::IPCResult RecvCaretMoveEvent(
+      const uint64_t& aID, const LayoutDeviceIntRect& aCaretRect,
+      const int32_t& aOffset, const bool& aIsSelectionCollapsed,
+      const bool& aIsAtEndOfLine, const int32_t& aGranularity,
+      const bool& aFromUser) final;
+
+  virtual mozilla::ipc::IPCResult RecvTextChangeEvent(
+      const uint64_t& aID, const nsAString& aStr, const int32_t& aStart,
+      const uint32_t& aLen, const bool& aIsInsert,
+      const bool& aFromUser) override;
+
+  virtual mozilla::ipc::IPCResult RecvFocusEvent(
+      const uint64_t& aID, const LayoutDeviceIntRect& aCaretRect) override;
+
+  virtual mozilla::ipc::IPCResult RecvSelectionEvent(
+      const uint64_t& aID, const uint64_t& aWidgetID,
+      const uint32_t& aType) override;
+
+  virtual mozilla::ipc::IPCResult RecvScrollingEvent(
+      const uint64_t& aID, const uint64_t& aType, const uint32_t& aScrollX,
+      const uint32_t& aScrollY, const uint32_t& aMaxScrollX,
+      const uint32_t& aMaxScrollY) override;
+
+  virtual mozilla::ipc::IPCResult RecvCache(
+      const mozilla::a11y::CacheUpdateType& aUpdateType,
+      nsTArray<CacheData>&& aData) override;
+
+  virtual mozilla::ipc::IPCResult RecvSelectedAccessiblesChanged(
+      nsTArray<uint64_t>&& aSelectedIDs,
+      nsTArray<uint64_t>&& aUnselectedIDs) override;
+
+  virtual mozilla::ipc::IPCResult RecvAccessiblesWillMove(
+      nsTArray<uint64_t>&& aIDs) override;
+
+#if !defined(XP_WIN)
+  virtual mozilla::ipc::IPCResult RecvAnnouncementEvent(
+      const uint64_t& aID, const nsAString& aAnnouncement,
+      const uint16_t& aPriority) override;
+#endif
+
+  virtual mozilla::ipc::IPCResult RecvTextSelectionChangeEvent(
+      const uint64_t& aID, nsTArray<TextRangeData>&& aSelection) override;
+
+  mozilla::ipc::IPCResult RecvRoleChangedEvent(
+      const a11y::role& aRole, const uint8_t& aRoleMapEntryIndex) final;
+
+  virtual mozilla::ipc::IPCResult RecvBindChildDoc(
+      NotNull<PDocAccessibleParent*> aChildDoc, const uint64_t& aID) override;
+
+  void Unbind() {
+    if (DocAccessibleParent* parent = ParentDoc()) {
+      parent->RemoveChildDoc(this);
+    }
+
+    SetParent(nullptr);
+  }
+
+  virtual mozilla::ipc::IPCResult RecvShutdown() override;
+  void Destroy();
+  virtual void ActorDestroy(ActorDestroyReason aWhy) override;
+
+  /*
+   * Return the main processes representation of the parent document (if any)
+   * of the document this object represents.
+   */
+  DocAccessibleParent* ParentDoc() const;
+  static const uint64_t kNoParentDoc = UINT64_MAX;
+
+  /**
+   * Called when a document in a content process notifies the main process of a
+   * new child document.
+   * Although this is called internally for OOP child documents, these should be
+   * added via the BrowserBridgeParent version of this method, as the parent id
+   * might not exist yet in that case.
+   */
+  ipc::IPCResult AddChildDoc(DocAccessibleParent* aChildDoc, uint64_t aParentID,
+                             bool aCreating = true);
+
+  /**
+   * Called when a document in a content process notifies the main process of a
+   * new OOP child document.
+   */
+  ipc::IPCResult AddChildDoc(dom::BrowserBridgeParent* aBridge);
+
+  void RemovePendingOOPChildDoc(dom::BrowserBridgeParent* aBridge) {
+    mPendingOOPChildDocs.Remove(aBridge);
+  }
+
+  /*
+   * Called when the document in the content process this object represents
+   * notifies the main process a child document has been removed.
+   */
+  void RemoveChildDoc(DocAccessibleParent* aChildDoc) {
+    RemoteAccessible* parent = aChildDoc->RemoteParent();
+    MOZ_ASSERT(parent);
+    if (parent) {
+      aChildDoc->RemoteParent()->ClearChildDoc(aChildDoc);
+    }
+    DebugOnly<bool> result = mChildDocs.RemoveElement(aChildDoc->mActorID);
+    aChildDoc->mParentDoc = kNoParentDoc;
+    MOZ_ASSERT(result);
+  }
+
+  void RemoveAccessible(RemoteAccessible* aAccessible) {
+    MOZ_DIAGNOSTIC_ASSERT(mAccessibles.GetEntry(aAccessible->ID()));
+    mAccessibles.RemoveEntry(aAccessible->ID());
+  }
+
+  /**
+   * Return the accessible for given id.
+   */
+  RemoteAccessible* GetAccessible(uintptr_t aID) {
+    if (!aID) return this;
+
+    ProxyEntry* e = mAccessibles.GetEntry(aID);
+    return e ? e->mProxy : nullptr;
+  }
+
+  const RemoteAccessible* GetAccessible(uintptr_t aID) const {
+    return const_cast<DocAccessibleParent*>(this)->GetAccessible(aID);
+  }
+
+  size_t ChildDocCount() const { return mChildDocs.Length(); }
+  const DocAccessibleParent* ChildDocAt(size_t aIdx) const {
+    return const_cast<DocAccessibleParent*>(this)->ChildDocAt(aIdx);
+  }
+  DocAccessibleParent* ChildDocAt(size_t aIdx) {
+    return LiveDocs().Get(mChildDocs[aIdx]);
+  }
+
+#if defined(XP_WIN)
+  void MaybeInitWindowEmulation();
+
+  /**
+   * Set emulated native window handle for a document.
+   * @param aWindowHandle emulated native window handle
+   */
+  void SetEmulatedWindowHandle(HWND aWindowHandle);
+  HWND GetEmulatedWindowHandle() const { return mEmulatedWindowHandle; }
+#endif
+
+  // Accessible
+  virtual Accessible* Parent() const override {
+    if (IsTopLevel()) {
+      return OuterDocOfRemoteBrowser();
+    }
+    return RemoteParent();
+  }
+
+  virtual int32_t IndexInParent() const override {
+    if (IsTopLevel() && OuterDocOfRemoteBrowser()) {
+      // An OuterDoc can only have 1 child.
+      return 0;
+    }
+    return RemoteAccessible::IndexInParent();
+  }
+
+  /**
+   * Get the focused Accessible in this document, if any.
+   */
+  RemoteAccessible* GetFocusedAcc() const {
+    return const_cast<DocAccessibleParent*>(this)->GetAccessible(mFocus);
+  }
+
+  /**
+   * Get the HyperText Accessible containing the caret and the offset of the
+   * caret within. If there is no caret in this document, returns
+   * {nullptr, -1}.
+   */
+  std::pair<RemoteAccessible*, int32_t> GetCaret() const {
+    if (mCaretOffset == -1) {
+      return {nullptr, -1};
+    }
+    RemoteAccessible* acc =
+        const_cast<DocAccessibleParent*>(this)->GetAccessible(mCaretId);
+    if (!acc) {
+      return {nullptr, -1};
+    }
+    return {acc, mCaretOffset};
+  }
+
+  bool IsCaretAtEndOfLine() const { return mIsCaretAtEndOfLine; }
+
+  virtual void SelectionRanges(nsTArray<TextRange>* aRanges) const override;
+
+  virtual Accessible* FocusedChild() override;
+
+  void URL(nsAString& aURL) const;
+  void URL(nsACString& aURL) const;
+
+  void MimeType(nsAString& aURL) const;
+
+  virtual Relation RelationByType(RelationType aType) const override;
+
+  // Tracks cached reverse relations (ie. those not set explicitly by an
+  // attribute like aria-labelledby) for accessibles in this doc. This map is of
+  // the form: {accID, {relationType, [targetAccID, targetAccID, ...]}}
+  nsTHashMap<uint64_t, nsTHashMap<RelationType, nsTArray<uint64_t>>>
+      mReverseRelations;
+
+  // Computed from the viewport cache, the accs referenced by these ids
+  // are currently on screen (making any acc not in this list offscreen).
+  nsTHashSet<uint64_t> mOnScreenAccessibles;
+
+  static DocAccessibleParent* GetFrom(dom::BrowsingContext* aBrowsingContext);
+
+  size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) override;
+
+ private:
+  ~DocAccessibleParent();
+
+  class ProxyEntry : public PLDHashEntryHdr {
+   public:
+    explicit ProxyEntry(const void*) : mProxy(nullptr) {}
+    ProxyEntry(ProxyEntry&& aOther) : mProxy(aOther.mProxy) {
+      aOther.mProxy = nullptr;
+    }
+    ~ProxyEntry() { delete mProxy; }
+
+    typedef uint64_t KeyType;
+    typedef const void* KeyTypePointer;
+
+    bool KeyEquals(const void* aKey) const {
+      return mProxy->ID() == (uint64_t)aKey;
+    }
+
+    static const void* KeyToPointer(uint64_t aKey) { return (void*)aKey; }
+
+    static PLDHashNumber HashKey(const void* aKey) { return (uint64_t)aKey; }
+
+    enum { ALLOW_MEMMOVE = true };
+
+    RemoteAccessible* mProxy;
+  };
+
+  RemoteAccessible* CreateAcc(const AccessibleData& aAccData);
+  void AttachChild(RemoteAccessible* aParent, uint32_t aIndex,
+                   RemoteAccessible* aChild);
+  [[nodiscard]] bool CheckDocTree() const;
+  xpcAccessibleGeneric* GetXPCAccessible(RemoteAccessible* aProxy);
+
+  void FireEvent(RemoteAccessible* aAcc, const uint32_t& aType);
+
+  /**
+   * If this Accessible is being moved, prepare it for reuse. Otherwise, it is
+   * being removed, so shut it down.
+   */
+  void ShutdownOrPrepareForMove(RemoteAccessible* aAcc);
+
+  nsTArray<uint64_t> mChildDocs;
+  uint64_t mParentDoc;
+
+#if defined(XP_WIN)
+  // The handle associated with the emulated window that contains this document
+  HWND mEmulatedWindowHandle;
+#endif  // defined(XP_WIN)
+
+  /*
+   * Conceptually this is a map from IDs to proxies, but we store the ID in the
+   * proxy object so we can't use a real map.
+   */
+  nsTHashtable<ProxyEntry> mAccessibles;
+  uint64_t mPendingShowChild = 0;
+  uint64_t mPendingShowParent = 0;
+  uint32_t mPendingShowIndex = 0;
+  nsTHashSet<uint64_t> mMovingIDs;
+  uint64_t mActorID;
+  bool mTopLevel;
+  bool mTopLevelInContentProcess;
+  bool mShutdown;
+  RefPtr<dom::CanonicalBrowsingContext> mBrowsingContext;
+
+  nsTHashSet<RefPtr<dom::BrowserBridgeParent>> mPendingOOPChildDocs;
+
+  uint64_t mFocus;
+  uint64_t mCaretId;
+  int32_t mCaretOffset;
+  bool mIsCaretAtEndOfLine;
+  nsTArray<TextRangeData> mTextSelections;
+
+  static uint64_t sMaxDocID;
+  static nsTHashMap<nsUint64HashKey, DocAccessibleParent*>& LiveDocs() {
+    static nsTHashMap<nsUint64HashKey, DocAccessibleParent*> sLiveDocs;
+    return sLiveDocs;
+  }
+};
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif