Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1028 insertions, 0 deletions

diff --git a/accessible/generic/LocalAccessible.h b/accessible/generic/LocalAccessible.h
new file mode 100644
index 0000000000..a3620f4cbd
--- /dev/null
+++ b/accessible/generic/LocalAccessible.h
@@ -0,0 +1,1028 @@
+/* -*- 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 _LocalAccessible_H_
+#define _LocalAccessible_H_
+
+#include "mozilla/ComputedStyle.h"
+#include "mozilla/a11y/Accessible.h"
+#include "mozilla/a11y/AccTypes.h"
+#include "mozilla/a11y/RelationType.h"
+#include "mozilla/a11y/States.h"
+
+#include "mozilla/UniquePtr.h"
+
+#include "nsIContent.h"
+#include "nsTArray.h"
+#include "nsRefPtrHashtable.h"
+#include "nsRect.h"
+
+struct nsRoleMapEntry;
+
+class nsIFrame;
+
+class nsAttrValue;
+
+namespace mozilla::dom {
+class Element;
+}
+
+namespace mozilla {
+namespace a11y {
+
+class LocalAccessible;
+class AccAttributes;
+class AccEvent;
+class AccGroupInfo;
+class ApplicationAccessible;
+class CacheData;
+class DocAccessible;
+class EmbeddedObjCollector;
+class EventTree;
+class HTMLImageMapAccessible;
+class HTMLLIAccessible;
+class HTMLLinkAccessible;
+class HyperTextAccessible;
+class HyperTextAccessibleBase;
+class ImageAccessible;
+class KeyBinding;
+class OuterDocAccessible;
+class RemoteAccessible;
+class Relation;
+class RootAccessible;
+class TableAccessible;
+class TableCellAccessible;
+class TextLeafAccessible;
+class XULLabelAccessible;
+class XULTreeAccessible;
+
+enum class CacheUpdateType;
+
+#ifdef A11Y_LOG
+namespace logging {
+typedef const char* (*GetTreePrefix)(void* aData, LocalAccessible*);
+void Tree(const char* aTitle, const char* aMsgText, LocalAccessible* aRoot,
+          GetTreePrefix aPrefixFunc, void* GetTreePrefixData);
+void TreeSize(const char* aTitle, const char* aMsgText, LocalAccessible* aRoot);
+};  // namespace logging
+#endif
+
+typedef nsRefPtrHashtable<nsPtrHashKey<const void>, LocalAccessible>
+    AccessibleHashtable;
+
+#define NS_ACCESSIBLE_IMPL_IID                       \
+  { /* 133c8bf4-4913-4355-bd50-426bd1d6e1ad */       \
+    0x133c8bf4, 0x4913, 0x4355, {                    \
+      0xbd, 0x50, 0x42, 0x6b, 0xd1, 0xd6, 0xe1, 0xad \
+    }                                                \
+  }
+
+/**
+ * An accessibility tree node that originated in mDoc's content process.
+ */
+class LocalAccessible : public nsISupports, public Accessible {
+ public:
+  LocalAccessible(nsIContent* aContent, DocAccessible* aDoc);
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_CLASS(LocalAccessible)
+
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ACCESSIBLE_IMPL_IID)
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Public methods
+
+  /**
+   * Return the document accessible for this accessible.
+   */
+  DocAccessible* Document() const { return mDoc; }
+
+  /**
+   * Return the root document accessible for this accessible.
+   */
+  a11y::RootAccessible* RootAccessible() const;
+
+  /**
+   * Return frame for this accessible.
+   * Note that this will return null for display: contents. Also,
+   * DocAccessible::GetFrame can return null if the frame tree hasn't been
+   * created yet.
+   */
+  virtual nsIFrame* GetFrame() const;
+
+  /**
+   * Return DOM node associated with the accessible.
+   */
+  virtual nsINode* GetNode() const;
+
+  nsIContent* GetContent() const { return mContent; }
+  dom::Element* Elm() const;
+
+  /**
+   * Return node type information of DOM node associated with the accessible.
+   */
+  bool IsContent() const { return GetNode() && GetNode()->IsContent(); }
+
+  /**
+   * Return the unique identifier of the accessible.
+   * ID() should be preferred, but this method still exists because many
+   * LocalAccessible callers expect a void*.
+   */
+  void* UniqueID() { return static_cast<void*>(this); }
+
+  virtual uint64_t ID() const override {
+    return IsDoc() ? 0 : reinterpret_cast<uintptr_t>(this);
+  }
+
+  virtual void Language(nsAString& aLocale) override;
+
+  /**
+   * Get the description of this accessible.
+   */
+  virtual void Description(nsString& aDescription) const override;
+
+  /**
+   * Get the value of this accessible.
+   */
+  virtual void Value(nsString& aValue) const override;
+
+  /**
+   * Get the name of this accessible.
+   */
+  virtual ENameValueFlag Name(nsString& aName) const override;
+
+  /**
+   * Maps ARIA state attributes to state of accessible. Note the given state
+   * argument should hold states for accessible before you pass it into this
+   * method.
+   *
+   * @param  [in/out] where to fill the states into.
+   */
+  virtual void ApplyARIAState(uint64_t* aState) const;
+
+  /**
+   * Return enumerated accessible role (see constants in Role.h).
+   */
+  virtual mozilla::a11y::role Role() const override;
+
+  /**
+   * Return accessible role specified by ARIA (see constants in
+   * roles).
+   */
+  inline mozilla::a11y::role ARIARole();
+
+  /**
+   * Returns enumerated accessible role from native markup (see constants in
+   * Role.h). Doesn't take into account ARIA roles.
+   */
+  virtual mozilla::a11y::role NativeRole() const;
+
+  virtual uint64_t State() override;
+
+  /**
+   * Return interactive states present on the accessible
+   * (@see NativeInteractiveState).
+   */
+  uint64_t InteractiveState() const {
+    uint64_t state = NativeInteractiveState();
+    ApplyARIAState(&state);
+    return state;
+  }
+
+  /**
+   * Return link states present on the accessible.
+   */
+  uint64_t LinkState() const {
+    uint64_t state = NativeLinkState();
+    ApplyARIAState(&state);
+    return state;
+  }
+
+  /**
+   * Return the states of accessible, not taking into account ARIA states.
+   * Use State() to get complete set of states.
+   */
+  virtual uint64_t NativeState() const;
+
+  /**
+   * Return native interactice state (unavailable, focusable or selectable).
+   */
+  virtual uint64_t NativeInteractiveState() const;
+
+  /**
+   * Return native link states present on the accessible.
+   */
+  virtual uint64_t NativeLinkState() const;
+
+  /**
+   * Return bit set of invisible and offscreen states.
+   */
+  uint64_t VisibilityState() const;
+
+  /**
+   * Return true if native unavailable state present.
+   */
+  virtual bool NativelyUnavailable() const;
+
+  virtual already_AddRefed<AccAttributes> Attributes() override;
+
+  /**
+   * Return direct or deepest child at the given point.
+   *
+   * @param  aX           [in] x coordinate relative screen
+   * @param  aY           [in] y coordinate relative screen
+   * @param  aWhichChild  [in] flag points if deepest or direct child
+   *                        should be returned
+   */
+  virtual LocalAccessible* LocalChildAtPoint(int32_t aX, int32_t aY,
+                                             EWhichChildAtPoint aWhichChild);
+
+  /**
+   * Similar to LocalChildAtPoint but crosses process boundaries.
+   */
+  virtual Accessible* ChildAtPoint(int32_t aX, int32_t aY,
+                                   EWhichChildAtPoint aWhichChild) override;
+
+  virtual Relation RelationByType(RelationType aType) const override;
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Initializing methods
+
+  /**
+   * Shutdown this accessible object.
+   */
+  virtual void Shutdown();
+
+  /**
+   * Set the ARIA role map entry for a new accessible.
+   */
+  inline void SetRoleMapEntry(const nsRoleMapEntry* aRoleMapEntry);
+
+  /**
+   * Append/insert/remove a child. Return true if operation was successful.
+   */
+  bool AppendChild(LocalAccessible* aChild) {
+    return InsertChildAt(mChildren.Length(), aChild);
+  }
+  virtual bool InsertChildAt(uint32_t aIndex, LocalAccessible* aChild);
+
+  /**
+   * Inserts a child after given sibling. If the child cannot be inserted,
+   * then the child is unbound from the document, and false is returned. Make
+   * sure to null out any references on the child object as it may be destroyed.
+   */
+  inline bool InsertAfter(LocalAccessible* aNewChild,
+                          LocalAccessible* aRefChild);
+
+  virtual bool RemoveChild(LocalAccessible* aChild);
+
+  /**
+   * Reallocates the child within its parent.
+   */
+  virtual void RelocateChild(uint32_t aNewIndex, LocalAccessible* aChild);
+
+  // Accessible hierarchy method overrides
+
+  virtual Accessible* Parent() const override { return LocalParent(); }
+
+  virtual Accessible* ChildAt(uint32_t aIndex) const override {
+    return LocalChildAt(aIndex);
+  }
+
+  virtual Accessible* NextSibling() const override {
+    return LocalNextSibling();
+  }
+
+  virtual Accessible* PrevSibling() const override {
+    return LocalPrevSibling();
+  }
+
+  //////////////////////////////////////////////////////////////////////////////
+  // LocalAccessible tree traverse methods
+
+  /**
+   * Return parent accessible.
+   */
+  LocalAccessible* LocalParent() const { return mParent; }
+
+  /**
+   * Return child accessible at the given index.
+   */
+  virtual LocalAccessible* LocalChildAt(uint32_t aIndex) const;
+
+  /**
+   * Return child accessible count.
+   */
+  virtual uint32_t ChildCount() const override;
+
+  /**
+   * Return index of the given child accessible.
+   */
+  int32_t GetIndexOf(const LocalAccessible* aChild) const {
+    return (aChild->mParent != this) ? -1 : aChild->IndexInParent();
+  }
+
+  /**
+   * Return index in parent accessible.
+   */
+  virtual int32_t IndexInParent() const override;
+
+  /**
+   * Return first/last/next/previous sibling of the accessible.
+   */
+  inline LocalAccessible* LocalNextSibling() const {
+    return GetSiblingAtOffset(1);
+  }
+  inline LocalAccessible* LocalPrevSibling() const {
+    return GetSiblingAtOffset(-1);
+  }
+  inline LocalAccessible* LocalFirstChild() const { return LocalChildAt(0); }
+  inline LocalAccessible* LocalLastChild() const {
+    uint32_t childCount = ChildCount();
+    return childCount != 0 ? LocalChildAt(childCount - 1) : nullptr;
+  }
+
+  virtual uint32_t EmbeddedChildCount() override;
+
+  /**
+   * Return embedded accessible child at the given index.
+   */
+  virtual Accessible* EmbeddedChildAt(uint32_t aIndex) override;
+
+  virtual int32_t IndexOfEmbeddedChild(Accessible* aChild) override;
+
+  /**
+   * Return number of content children/content child at index. The content
+   * child is created from markup in contrast to it's never constructed by its
+   * parent accessible (like treeitem accessibles for XUL trees).
+   */
+  uint32_t ContentChildCount() const { return mChildren.Length(); }
+  LocalAccessible* ContentChildAt(uint32_t aIndex) const {
+    return mChildren.ElementAt(aIndex);
+  }
+
+  /**
+   * Return true if the accessible is attached to tree.
+   */
+  bool IsBoundToParent() const { return !!mParent; }
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Miscellaneous methods
+
+  /**
+   * Handle accessible event, i.e. process it, notifies observers and fires
+   * platform specific event.
+   */
+  virtual nsresult HandleAccEvent(AccEvent* aAccEvent);
+
+  /**
+   * Return true if the accessible is an acceptable child.
+   */
+  virtual bool IsAcceptableChild(nsIContent* aEl) const {
+    return aEl &&
+           !aEl->IsAnyOfHTMLElements(nsGkAtoms::option, nsGkAtoms::optgroup);
+  }
+
+  virtual void AppendTextTo(nsAString& aText, uint32_t aStartOffset = 0,
+                            uint32_t aLength = UINT32_MAX) override;
+
+  virtual nsRect BoundsInAppUnits() const override;
+
+  virtual LayoutDeviceIntRect Bounds() const override;
+
+  /**
+   * Return boundaries rect relative the bounding frame.
+   */
+  virtual nsRect RelativeBounds(nsIFrame** aRelativeFrame) const;
+
+  /**
+   * Return boundaries rect relative to the frame of the parent accessible.
+   * The returned bounds are the same regardless of whether the parent is
+   * scrolled. This means the scroll position must be later subtracted to
+   * calculate absolute coordinates.
+   */
+  virtual nsRect ParentRelativeBounds();
+
+  /**
+   * Selects the accessible within its container if applicable.
+   */
+  virtual void SetSelected(bool aSelect) override;
+
+  /**
+   * Select the accessible within its container.
+   */
+  virtual void TakeSelection() override;
+
+  /**
+   * Focus the accessible.
+   */
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY virtual void TakeFocus() const override;
+
+  MOZ_CAN_RUN_SCRIPT
+  virtual void ScrollTo(uint32_t aHow) const override;
+
+  virtual void ScrollToPoint(uint32_t aCoordinateType, int32_t aX,
+                             int32_t aY) override;
+
+  /**
+   * Get a pointer to accessibility interface for this node, which is specific
+   * to the OS/accessibility toolkit we're running on.
+   */
+  virtual void GetNativeInterface(void** aNativeAccessible);
+
+  virtual Maybe<int32_t> GetIntARIAAttr(nsAtom* aAttrName) const override;
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Downcasting and types
+
+  inline bool IsAbbreviation() const {
+    return mContent &&
+           mContent->IsAnyOfHTMLElements(nsGkAtoms::abbr, nsGkAtoms::acronym);
+  }
+
+  ApplicationAccessible* AsApplication();
+
+  DocAccessible* AsDoc();
+
+  HyperTextAccessible* AsHyperText();
+  virtual HyperTextAccessibleBase* AsHyperTextBase() override;
+
+  HTMLLIAccessible* AsHTMLListItem();
+
+  HTMLLinkAccessible* AsHTMLLink();
+
+  ImageAccessible* AsImage();
+
+  HTMLImageMapAccessible* AsImageMap();
+
+  OuterDocAccessible* AsOuterDoc();
+
+  a11y::RootAccessible* AsRoot();
+
+  virtual TableAccessible* AsTable() override;
+  virtual TableCellAccessible* AsTableCell() override;
+
+  TextLeafAccessible* AsTextLeaf();
+
+  XULLabelAccessible* AsXULLabel();
+
+  XULTreeAccessible* AsXULTree();
+
+  //////////////////////////////////////////////////////////////////////////////
+  // ActionAccessible
+
+  virtual bool HasPrimaryAction() const override;
+
+  virtual uint8_t ActionCount() const override;
+
+  virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+
+  virtual bool DoAction(uint8_t aIndex) const override;
+
+  virtual KeyBinding AccessKey() const override;
+
+  /**
+   * Return global keyboard shortcut for default action, such as Ctrl+O for
+   * Open file menuitem.
+   */
+  virtual KeyBinding KeyboardShortcut() const;
+
+  //////////////////////////////////////////////////////////////////////////////
+  // HyperLinkAccessible (any embedded object in text can implement HyperLink,
+  // which helps determine where it is located within containing text).
+
+  /**
+   * Return true if the accessible is hyper link accessible.
+   */
+  virtual bool IsLink() const override;
+
+  //////////////////////////////////////////////////////////////////////////////
+  // SelectAccessible
+
+  /**
+   * Return an array of selected items.
+   */
+  virtual void SelectedItems(nsTArray<Accessible*>* aItems) override;
+
+  /**
+   * Return the number of selected items.
+   */
+  virtual uint32_t SelectedItemCount() override;
+
+  /**
+   * Return selected item at the given index.
+   */
+  virtual Accessible* GetSelectedItem(uint32_t aIndex) override;
+
+  /**
+   * Determine if item at the given index is selected.
+   */
+  virtual bool IsItemSelected(uint32_t aIndex) override;
+
+  /**
+   * Add item at the given index the selection. Return true if success.
+   */
+  virtual bool AddItemToSelection(uint32_t aIndex) override;
+
+  /**
+   * Remove item at the given index from the selection. Return if success.
+   */
+  virtual bool RemoveItemFromSelection(uint32_t aIndex) override;
+
+  /**
+   * Select all items. Return true if success.
+   */
+  virtual bool SelectAll() override;
+
+  /**
+   * Unselect all items. Return true if success.
+   */
+  virtual bool UnselectAll() override;
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Value (numeric value interface)
+
+  virtual double MaxValue() const override;
+  virtual double MinValue() const override;
+  virtual double CurValue() const override;
+  virtual double Step() const override;
+  virtual bool SetCurValue(double aValue) override;
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Widgets
+
+  /**
+   * Return true if accessible is a widget, i.e. control or accessible that
+   * manages its items. Note, being a widget the accessible may be a part of
+   * composite widget.
+   */
+  virtual bool IsWidget() const;
+
+  /**
+   * Return true if the widget is active, i.e. has a focus within it.
+   */
+  virtual bool IsActiveWidget() const;
+
+  /**
+   * Return true if the widget has items and items are operable by user and
+   * can be activated.
+   */
+  virtual bool AreItemsOperable() const;
+
+  /**
+   * Return the current item of the widget, i.e. an item that has or will have
+   * keyboard focus when widget gets active.
+   */
+  virtual LocalAccessible* CurrentItem() const;
+
+  /**
+   * Set the current item of the widget.
+   */
+  virtual void SetCurrentItem(const LocalAccessible* aItem);
+
+  /**
+   * Return container widget this accessible belongs to.
+   */
+  virtual LocalAccessible* ContainerWidget() const;
+
+  bool IsActiveDescendant(LocalAccessible** aWidget = nullptr) const;
+
+  /**
+   * Return true if the accessible is defunct.
+   */
+  inline bool IsDefunct() const;
+
+  /**
+   * Return false if the accessible is no longer in the document.
+   */
+  bool IsInDocument() const { return !(mStateFlags & eIsNotInDocument); }
+
+  /**
+   * Return true if the accessible should be contained by document node map.
+   */
+  bool IsNodeMapEntry() const {
+    return HasOwnContent() && !(mStateFlags & eNotNodeMapEntry);
+  }
+
+  /**
+   * Return true if the accessible has associated DOM content.
+   */
+  bool HasOwnContent() const {
+    return mContent && !(mStateFlags & eSharedNode);
+  }
+
+  /**
+   * Return true if native markup has a numeric value.
+   */
+  inline bool NativeHasNumericValue() const;
+
+  /**
+   * Return true if ARIA specifies support for a numeric value.
+   */
+  inline bool ARIAHasNumericValue() const;
+
+  /**
+   * Return true if the accessible has a numeric value.
+   */
+  virtual bool HasNumericValue() const override;
+
+  /**
+   * Return true if the accessible state change is processed by handling proper
+   * DOM UI event, if otherwise then false. For example, CheckboxAccessible
+   * created for HTML:input@type="checkbox" will process
+   * nsIDocumentObserver::ElementStateChanged instead of 'CheckboxStateChange'
+   * event.
+   */
+  bool NeedsDOMUIEvent() const { return !(mStateFlags & eIgnoreDOMUIEvent); }
+
+  /**
+   * Get/set repositioned bit indicating that the accessible was moved in
+   * the accessible tree, i.e. the accessible tree structure differs from DOM.
+   */
+  bool IsRelocated() const { return mStateFlags & eRelocated; }
+  void SetRelocated(bool aRelocated) {
+    if (aRelocated) {
+      mStateFlags |= eRelocated;
+    } else {
+      mStateFlags &= ~eRelocated;
+    }
+  }
+
+  /**
+   * Return true if the accessible allows accessible children from subtree of
+   * a DOM element of this accessible.
+   */
+  bool KidsFromDOM() const { return !(mStateFlags & eNoKidsFromDOM); }
+
+  /**
+   * Return true if this accessible has a parent, relation or ancestor with a
+   * relation whose name depends on this accessible.
+   */
+  bool HasNameDependent() const { return mContextFlags & eHasNameDependent; }
+
+  /**
+   * Return true if this accessible has a parent, relation or ancestor with a
+   * relation whose description depends on this accessible.
+   */
+  bool HasDescriptionDependent() const {
+    return mContextFlags & eHasDescriptionDependent;
+  }
+
+  /**
+   * Return true if the element is inside an alert.
+   */
+  bool IsInsideAlert() const { return mContextFlags & eInsideAlert; }
+
+  /**
+   * Return true if there is a pending reorder event for this accessible.
+   */
+  bool ReorderEventTarget() const { return mReorderEventTarget; }
+
+  /**
+   * Return true if there is a pending show event for this accessible.
+   */
+  bool ShowEventTarget() const { return mShowEventTarget; }
+
+  /**
+   * Return true if there is a pending hide event for this accessible.
+   */
+  bool HideEventTarget() const { return mHideEventTarget; }
+
+  /**
+   * Set if there is a pending reorder event for this accessible.
+   */
+  void SetReorderEventTarget(bool aTarget) { mReorderEventTarget = aTarget; }
+
+  /**
+   * Set if this accessible is a show event target.
+   */
+  void SetShowEventTarget(bool aTarget) { mShowEventTarget = aTarget; }
+
+  /**
+   * Set if this accessible is a hide event target.
+   */
+  void SetHideEventTarget(bool aTarget) { mHideEventTarget = aTarget; }
+
+  void Announce(const nsAString& aAnnouncement, uint16_t aPriority);
+
+  virtual bool IsRemote() const override { return false; }
+
+  already_AddRefed<AccAttributes> BundleFieldsForCache(
+      uint64_t aCacheDomain, CacheUpdateType aUpdateType);
+
+  /**
+   * Push fields to cache.
+   * aCacheDomain - describes which fields to bundle and ultimately send
+   * aUpdate - describes whether this is an initial or subsequent update
+   */
+  void SendCache(uint64_t aCacheDomain, CacheUpdateType aUpdate);
+
+  void MaybeQueueCacheUpdateForStyleChanges();
+
+  virtual nsAtom* TagName() const override;
+
+  virtual already_AddRefed<nsAtom> InputType() const override;
+
+  virtual already_AddRefed<nsAtom> DisplayStyle() const override;
+
+  virtual float Opacity() const override;
+
+  virtual void DOMNodeID(nsString& aID) const override;
+
+  virtual void LiveRegionAttributes(nsAString* aLive, nsAString* aRelevant,
+                                    Maybe<bool>* aAtomic,
+                                    nsAString* aBusy) const override;
+
+  virtual Maybe<bool> ARIASelected() const override;
+
+ protected:
+  virtual ~LocalAccessible();
+
+  /**
+   * Return the accessible name provided by native markup. It doesn't take
+   * into account ARIA markup used to specify the name.
+   */
+  virtual mozilla::a11y::ENameValueFlag NativeName(nsString& aName) const;
+
+  /**
+   * Return the accessible description provided by native markup. It doesn't
+   * take into account ARIA markup used to specify the description.
+   */
+  void NativeDescription(nsString& aDescription) const;
+
+  /**
+   * Return object attributes provided by native markup. It doesn't take into
+   * account ARIA.
+   */
+  virtual already_AddRefed<AccAttributes> NativeAttributes();
+
+  /**
+   * The given attribute has the potential of changing the accessible's state.
+   * This is used to capture the state before the attribute change and compare
+   * it with the state after.
+   */
+  virtual bool AttributeChangesState(nsAtom* aAttribute);
+
+  /**
+   * Notify accessible that a DOM attribute on its associated content has
+   * changed. This allows the accessible to update its state and emit any
+   * relevant events.
+   */
+  virtual void DOMAttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
+                                   int32_t aModType,
+                                   const nsAttrValue* aOldValue,
+                                   uint64_t aOldState);
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Initializing, cache and tree traverse methods
+
+  /**
+   * Destroy the object.
+   */
+  void LastRelease();
+
+  /**
+   * Set accessible parent and index in parent.
+   */
+  void BindToParent(LocalAccessible* aParent, uint32_t aIndexInParent);
+  void UnbindFromParent();
+
+  /**
+   * Return sibling accessible at the given offset.
+   */
+  virtual LocalAccessible* GetSiblingAtOffset(int32_t aOffset,
+                                              nsresult* aError = nullptr) const;
+
+  void ModifySubtreeContextFlags(uint32_t aContextFlags, bool aAdd);
+
+  /**
+   * Flags used to describe the state of this accessible.
+   */
+  enum StateFlags {
+    eIsDefunct = 1 << 0,        // accessible is defunct
+    eIsNotInDocument = 1 << 1,  // accessible is not in document
+    eSharedNode = 1 << 2,  // accessible shares DOM node from another accessible
+    eNotNodeMapEntry = 1 << 3,   // accessible shouldn't be in document node map
+    eGroupInfoDirty = 1 << 4,    // accessible needs to update group info
+    eKidsMutating = 1 << 5,      // subtree is being mutated
+    eIgnoreDOMUIEvent = 1 << 6,  // don't process DOM UI events for a11y events
+    eRelocated = 1 << 7,         // accessible was moved in tree
+    eNoKidsFromDOM = 1 << 8,     // accessible doesn't allow children from DOM
+    eHasTextKids = 1 << 9,       // accessible have a text leaf in children
+    eOldFrameHasValidTransformStyle =
+        1 << 10,  // frame prior to most recent style change both has transform
+                  // styling and supports transforms
+
+    eLastStateFlag = eOldFrameHasValidTransformStyle
+  };
+
+  /**
+   * Flags used for contextual information about the accessible.
+   */
+  enum ContextFlags {
+    eHasNameDependent = 1 << 0,  // See HasNameDependent().
+    eInsideAlert = 1 << 1,
+    eHasDescriptionDependent = 1 << 2,  // See HasDescriptionDependent().
+
+    eLastContextFlag = eHasDescriptionDependent
+  };
+
+ protected:
+  //////////////////////////////////////////////////////////////////////////////
+  // Miscellaneous helpers
+
+  /**
+   * Return ARIA role (helper method).
+   */
+  mozilla::a11y::role ARIATransformRole(mozilla::a11y::role aRole) const;
+
+  /**
+   * Return the minimum role that should be used as a last resort if the element
+   * does not have a more specific role.
+   */
+  mozilla::a11y::role GetMinimumRole(mozilla::a11y::role aRole) const;
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Name helpers
+
+  /**
+   * Returns the accessible name specified by ARIA.
+   */
+  void ARIAName(nsString& aName) const;
+
+  /**
+   * Returns the accessible description specified by ARIA.
+   */
+  void ARIADescription(nsString& aDescription) const;
+
+  /**
+   * Returns the accessible name specified for this control using XUL
+   * <label control="id" ...>.
+   */
+  static void NameFromAssociatedXULLabel(DocAccessible* aDocument,
+                                         nsIContent* aElm, nsString& aName);
+
+  /**
+   * Return the name for XUL element.
+   */
+  static void XULElmName(DocAccessible* aDocument, nsIContent* aElm,
+                         nsString& aName);
+
+  // helper method to verify frames
+  static nsresult GetFullKeyName(const nsAString& aModifierName,
+                                 const nsAString& aKeyName,
+                                 nsAString& aStringOut);
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Action helpers
+
+  /**
+   * Prepares click action that will be invoked in timeout.
+   *
+   * @note  DoCommand() prepares an action in timeout because when action
+   *  command opens a modal dialog/window, it won't return until the
+   *  dialog/window is closed. If executing action command directly in
+   *  nsIAccessible::DoAction() method, it will block AT tools (e.g. GOK) that
+   *  invoke action of mozilla accessibles direclty (see bug 277888 for
+   * details).
+   *
+   * @param  aContent      [in, optional] element to click
+   * @param  aActionIndex  [in, optional] index of accessible action
+   */
+  void DoCommand(nsIContent* aContent = nullptr,
+                 uint32_t aActionIndex = 0) const;
+
+  /**
+   * Dispatch click event.
+   */
+  MOZ_CAN_RUN_SCRIPT
+  virtual void DispatchClickEvent(nsIContent* aContent,
+                                  uint32_t aActionIndex) const;
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Helpers
+
+  /**
+   *  Get the container node for an atomic region, defined by aria-atomic="true"
+   *  @return the container node
+   */
+  nsIContent* GetAtomicRegion() const;
+
+  /**
+   * Return numeric value of the given ARIA attribute, NaN if not applicable.
+   *
+   * @param aARIAProperty  [in] the ARIA property we're using
+   * @return  a numeric value
+   */
+  double AttrNumericValue(nsAtom* aARIAAttr) const;
+
+  /**
+   * Return the action rule based on ARIA enum constants EActionRule
+   * (see ARIAMap.h). Used by ActionCount() and ActionNameAt().
+   */
+  uint32_t GetActionRule() const;
+
+  virtual AccGroupInfo* GetGroupInfo() const override;
+
+  virtual AccGroupInfo* GetOrCreateGroupInfo() override;
+
+  virtual void ARIAGroupPosition(int32_t* aLevel, int32_t* aSetSize,
+                                 int32_t* aPosInSet) const override;
+
+  // Data Members
+  // mContent can be null in a DocAccessible if the document has no body or
+  // root element, or if the initial tree hasn't been constructed yet.
+  nsCOMPtr<nsIContent> mContent;
+  RefPtr<DocAccessible> mDoc;
+
+  LocalAccessible* mParent;
+  nsTArray<LocalAccessible*> mChildren;
+  int32_t mIndexInParent;
+
+  // These are used to determine whether to send cache updates.
+  Maybe<nsRect> mBounds;
+  int32_t mFirstLineStart;
+
+  /**
+   * Maintain a reference to the ComputedStyle of our frame so we can
+   * send cache updates when style changes are observed.
+   *
+   * This RefPtr is initialised in BundleFieldsForCache to the ComputedStyle
+   * for our initial frame.
+   * Style changes are observed in one of two ways:
+   * 1. Style changes on the same frame are observed in
+   * nsIFrame::DidSetComputedStyle.
+   * 2. Style changes for reconstructed frames are handled in
+   * DocAccessible::PruneOrInsertSubtree.
+   * In both cases, we call into MaybeQueueCacheUpdateForStyleChanges. There, we
+   * compare a11y-relevant properties in mOldComputedStyle with the current
+   * ComputedStyle fetched from GetFrame()->Style(). Finally, we send cache
+   * updates for attributes affected by the style change and update
+   * mOldComputedStyle to the style of our current frame.
+   */
+  RefPtr<const ComputedStyle> mOldComputedStyle;
+
+  static const uint8_t kStateFlagsBits = 11;
+  static const uint8_t kContextFlagsBits = 3;
+
+  /**
+   * Keep in sync with StateFlags, ContextFlags, and AccTypes.
+   */
+  mutable uint32_t mStateFlags : kStateFlagsBits;
+  uint32_t mContextFlags : kContextFlagsBits;
+  uint32_t mReorderEventTarget : 1;
+  uint32_t mShowEventTarget : 1;
+  uint32_t mHideEventTarget : 1;
+
+  void StaticAsserts() const;
+
+#ifdef A11Y_LOG
+  friend void logging::Tree(const char* aTitle, const char* aMsgText,
+                            LocalAccessible* aRoot,
+                            logging::GetTreePrefix aPrefixFunc,
+                            void* aGetTreePrefixData);
+  friend void logging::TreeSize(const char* aTitle, const char* aMsgText,
+                                LocalAccessible* aRoot);
+#endif
+  friend class DocAccessible;
+  friend class xpcAccessible;
+  friend class TreeMutation;
+
+  UniquePtr<mozilla::a11y::EmbeddedObjCollector> mEmbeddedObjCollector;
+  int32_t mIndexOfEmbeddedChild;
+
+  friend class EmbeddedObjCollector;
+
+  mutable AccGroupInfo* mGroupInfo;
+  friend class AccGroupInfo;
+
+ private:
+  LocalAccessible() = delete;
+  LocalAccessible(const LocalAccessible&) = delete;
+  LocalAccessible& operator=(const LocalAccessible&) = delete;
+
+  /**
+   * Traverses the accessible's parent chain in search of an accessible with
+   * a frame. Returns the frame when found. Includes special handling for
+   * OOP iframe docs and tab documents.
+   */
+  nsIFrame* FindNearestAccessibleAncestorFrame();
+
+  LocalAccessible* GetPopoverTargetDetailsRelation() const;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(LocalAccessible, NS_ACCESSIBLE_IMPL_IID)
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible downcasting method
+
+inline LocalAccessible* Accessible::AsLocal() {
+  return IsLocal() ? static_cast<LocalAccessible*>(this) : nullptr;
+}
+
+}  // namespace a11y
+}  // namespace mozilla
+
+#endif