blob: 8f1b69617ac81d3d1407d2d7b02d2ca9254d321f [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stdint.h>
#include <map>
#include <memory>
#include <ostream>
#include <set>
#include <string>
#include <utility>
#include <vector>
#include "base/macros.h"
#include "base/optional.h"
#include "base/strings/string16.h"
#include "base/strings/string_split.h"
#include "build/build_config.h"
#include "content/browser/accessibility/accessibility_buildflags.h"
#include "content/browser/accessibility/browser_accessibility_position.h"
#include "content/common/content_export.h"
#include "third_party/blink/public/web/web_ax_enums.h"
#include "ui/accessibility/ax_enums.mojom-forward.h"
#include "ui/accessibility/ax_node.h"
#include "ui/accessibility/ax_node_data.h"
#include "ui/accessibility/ax_node_position.h"
#include "ui/accessibility/ax_range.h"
#include "ui/accessibility/platform/ax_platform_node.h"
#include "ui/accessibility/platform/ax_platform_node_delegate.h"
// a platform-specific subclass of BrowserAccessibility and
// BrowserAccessibilityManager.
#if defined(OS_WIN)
#if defined(OS_MAC)
#if defined(OS_ANDROID) && !defined(USE_AURA)
#if defined(OS_MAC) && __OBJC__
@class BrowserAccessibilityCocoa;
namespace content {
class BrowserAccessibilityManager;
// BrowserAccessibility
// A BrowserAccessibility object represents one node in the accessibility
// tree on the browser side. It exactly corresponds to one WebAXObject from
// Blink. It's owned by a BrowserAccessibilityManager.
// There are subclasses of BrowserAccessibility for each platform where
// we implement native accessibility APIs. This base class is used occasionally
// for tests.
class CONTENT_EXPORT BrowserAccessibility : public ui::AXPlatformNodeDelegate {
// Creates a platform specific BrowserAccessibility. Ownership passes to the
// caller.
static BrowserAccessibility* Create();
// Returns |delegate| as a BrowserAccessibility object, if |delegate| is
// non-null and an object in the BrowserAccessibility class hierarchy.
static BrowserAccessibility* FromAXPlatformNodeDelegate(
ui::AXPlatformNodeDelegate* delegate);
~BrowserAccessibility() override;
// Called only once, immediately after construction. The constructor doesn't
// take any arguments because in the Windows subclass we use a special
// function to construct a COM object.
virtual void Init(BrowserAccessibilityManager* manager, ui::AXNode* node);
// Called after the object is first initialized and again every time
// its data changes.
virtual void OnDataChanged() {}
// Called when the location changed.
virtual void OnLocationChanged() {}
// This is called when the platform-specific attributes for a node need
// to be recomputed, which may involve firing native events, due to a
// change other than an update from OnAccessibilityEvents.
virtual void UpdatePlatformAttributes() {}
// Return true if this object is equal to or a descendant of |ancestor|.
bool IsDescendantOf(const BrowserAccessibility* ancestor) const;
bool IsDocument() const;
bool IsIgnored() const;
bool IsLineBreakObject() const;
// See AXNode::IsLeaf().
bool PlatformIsLeaf() const;
// Returns true if this object can fire events.
virtual bool CanFireEvents() const;
// Return the AXPlatformNode corresponding to this node, if applicable
// on this platform.
virtual ui::AXPlatformNode* GetAXPlatformNode() const;
// Returns the number of children of this object, or 0 if PlatformIsLeaf()
// returns true.
virtual uint32_t PlatformChildCount() const;
// Return a pointer to the child at the given index, or NULL for an
// invalid index. Returns nullptr if PlatformIsLeaf() returns true.
virtual BrowserAccessibility* PlatformGetChild(uint32_t child_index) const;
BrowserAccessibility* PlatformGetParent() const;
virtual BrowserAccessibility* PlatformGetFirstChild() const;
virtual BrowserAccessibility* PlatformGetLastChild() const;
virtual BrowserAccessibility* PlatformGetNextSibling() const;
virtual BrowserAccessibility* PlatformGetPreviousSibling() const;
class CONTENT_EXPORT PlatformChildIterator : public ChildIterator {
PlatformChildIterator(const BrowserAccessibility* parent,
BrowserAccessibility* child);
PlatformChildIterator(const PlatformChildIterator& it);
~PlatformChildIterator() override;
bool operator==(const ChildIterator& rhs) const override;
bool operator!=(const ChildIterator& rhs) const override;
void operator++() override;
void operator++(int) override;
void operator--() override;
void operator--(int) override;
gfx::NativeViewAccessible GetNativeViewAccessible() const override;
BrowserAccessibility* get() const;
int GetIndexInParent() const override;
BrowserAccessibility& operator*() const override;
BrowserAccessibility* operator->() const override;
const BrowserAccessibility* parent_;
PlatformChildIterator PlatformChildrenBegin() const;
PlatformChildIterator PlatformChildrenEnd() const;
// Return a pointer to the first ancestor that is a selection container
BrowserAccessibility* PlatformGetSelectionContainer() const;
// If this object is exposed to the platform, returns this object. Otherwise,
// returns the platform leaf under which this object is found.
BrowserAccessibility* PlatformGetClosestPlatformObject() const;
bool IsPreviousSiblingOnSameLine() const;
bool IsNextSiblingOnSameLine() const;
// Returns nullptr if there are no children.
BrowserAccessibility* PlatformDeepestFirstChild() const;
// Returns nullptr if there are no children.
BrowserAccessibility* PlatformDeepestLastChild() const;
// Returns nullptr if there are no children.
BrowserAccessibility* InternalDeepestFirstChild() const;
// Returns nullptr if there are no children.
BrowserAccessibility* InternalDeepestLastChild() const;
// Derivative utils for AXPlatformNodeDelegate::GetBoundsRect
gfx::Rect GetClippedScreenBoundsRect(
ui::AXOffscreenResult* offscreen_result = nullptr) const override;
gfx::Rect GetUnclippedScreenBoundsRect(
ui::AXOffscreenResult* offscreen_result = nullptr) const;
gfx::Rect GetClippedRootFrameBoundsRect(
ui::AXOffscreenResult* offscreen_result = nullptr) const;
gfx::Rect GetUnclippedRootFrameBoundsRect(
ui::AXOffscreenResult* offscreen_result = nullptr) const;
gfx::Rect GetClippedFrameBoundsRect(
ui::AXOffscreenResult* offscreen_result = nullptr) const;
// Derivative utils for AXPlatformNodeDelegate::GetHypertextRangeBoundsRect
gfx::Rect GetUnclippedRootFrameHypertextRangeBoundsRect(
const int start_offset,
const int end_offset,
ui::AXOffscreenResult* offscreen_result = nullptr) const;
// Derivative utils for AXPlatformNodeDelegate::GetInnerTextRangeBoundsRect
gfx::Rect GetUnclippedScreenInnerTextRangeBoundsRect(
const int start_offset,
const int end_offset,
ui::AXOffscreenResult* offscreen_result = nullptr) const;
gfx::Rect GetUnclippedRootFrameInnerTextRangeBoundsRect(
const int start_offset,
const int end_offset,
ui::AXOffscreenResult* offscreen_result = nullptr) const;
// DEPRECATED: Prefer using the interfaces provided by AXPlatformNodeDelegate
// when writing new code.
gfx::Rect GetScreenHypertextRangeBoundsRect(
int start,
int len,
const ui::AXClippingBehavior clipping_behavior,
ui::AXOffscreenResult* offscreen_result = nullptr) const;
// Returns the bounds of the given range in coordinates relative to the
// top-left corner of the overall web area. Only valid when the role is
// WebAXRoleStaticText.
// DEPRECATED (for public use): Prefer using the interfaces provided by
// AXPlatformNodeDelegate when writing new non-private code.
gfx::Rect GetRootFrameHypertextRangeBoundsRect(
int start,
int len,
const ui::AXClippingBehavior clipping_behavior,
ui::AXOffscreenResult* offscreen_result = nullptr) const;
// This is an approximate hit test that only uses the information in
// the browser process to compute the correct result. It will not return
// correct results in many cases of z-index, overflow, and absolute
// positioning, so BrowserAccessibilityManager::CachingAsyncHitTest
// should be used instead, which falls back on calling ApproximateHitTest
// automatically.
// Note that unlike BrowserAccessibilityManager::CachingAsyncHitTest, this
// method takes a parameter in Blink's definition of screen coordinates.
// This is so that the scale factor is consistent with what we receive from
// Blink and store in the AX tree.
// Blink screen coordinates are 1:1 with physical pixels if use-zoom-for-dsf
// is disabled; they're physical pixels divided by device scale factor if
// use-zoom-for-dsf is disabled. For more information see:
BrowserAccessibility* ApproximateHitTest(
const gfx::Point& blink_screen_point);
// Accessors
BrowserAccessibilityManager* manager() const { return manager_; }
ui::AXNode* node() const { return node_; }
// These access the internal unignored accessibility tree, which doesn't
// necessarily reflect the accessibility tree that should be exposed on each
// platform. Use PlatformChildCount and PlatformGetChild to implement platform
// accessibility APIs.
uint32_t InternalChildCount() const;
BrowserAccessibility* InternalGetChild(uint32_t child_index) const;
BrowserAccessibility* InternalGetParent() const;
BrowserAccessibility* InternalGetFirstChild() const;
BrowserAccessibility* InternalGetLastChild() const;
BrowserAccessibility* InternalGetNextSibling() const;
BrowserAccessibility* InternalGetPreviousSibling() const;
using InternalChildIterator = ui::AXNode::ChildIteratorBase<
InternalChildIterator InternalChildrenBegin() const;
InternalChildIterator InternalChildrenEnd() const;
ui::AXNode::AXID GetId() const;
gfx::RectF GetLocation() const;
ax::mojom::Role GetRole() const;
int32_t GetState() const;
typedef base::StringPairs HtmlAttributes;
const HtmlAttributes& GetHtmlAttributes() const;
// Accessing accessibility attributes:
// There are dozens of possible attributes for an accessibility node,
// but only a few tend to apply to any one object, so we store them
// in sparse arrays of <attribute id, attribute value> pairs, organized
// by type (bool, int, float, string, int list).
// There are three accessors for each type of attribute: one that returns
// true if the attribute is present and false if not, one that takes a
// pointer argument and returns true if the attribute is present (if you
// need to distinguish between the default value and a missing attribute),
// and another that returns the default value for that type if the
// attribute is not present. In addition, strings can be returned as
// either std::string or base::string16, for convenience.
bool HasBoolAttribute(ax::mojom::BoolAttribute attr) const;
bool GetBoolAttribute(ax::mojom::BoolAttribute attr) const;
bool GetBoolAttribute(ax::mojom::BoolAttribute attr, bool* value) const;
bool HasFloatAttribute(ax::mojom::FloatAttribute attr) const;
float GetFloatAttribute(ax::mojom::FloatAttribute attr) const;
bool GetFloatAttribute(ax::mojom::FloatAttribute attr, float* value) const;
bool HasInheritedStringAttribute(ax::mojom::StringAttribute attribute) const;
const std::string& GetInheritedStringAttribute(
ax::mojom::StringAttribute attribute) const;
base::string16 GetInheritedString16Attribute(
ax::mojom::StringAttribute attribute) const;
bool HasIntAttribute(ax::mojom::IntAttribute attribute) const;
int GetIntAttribute(ax::mojom::IntAttribute attribute) const;
bool GetIntAttribute(ax::mojom::IntAttribute attribute, int* value) const;
bool HasStringAttribute(ax::mojom::StringAttribute attribute) const;
const std::string& GetStringAttribute(
ax::mojom::StringAttribute attribute) const;
bool GetStringAttribute(ax::mojom::StringAttribute attribute,
std::string* value) const;
base::string16 GetString16Attribute(
ax::mojom::StringAttribute attribute) const;
bool GetString16Attribute(ax::mojom::StringAttribute attribute,
base::string16* value) const;
bool HasIntListAttribute(ax::mojom::IntListAttribute attribute) const;
const std::vector<int32_t>& GetIntListAttribute(
ax::mojom::IntListAttribute attribute) const;
bool GetIntListAttribute(ax::mojom::IntListAttribute attribute,
std::vector<int32_t>* value) const;
// Retrieve the value of a html attribute from the attribute map and
// returns true if found.
bool GetHtmlAttribute(const char* attr, std::string* value) const;
bool GetHtmlAttribute(const char* attr, base::string16* value) const;
// Returns true if the bit corresponding to the given enum is 1.
bool HasState(ax::mojom::State state_enum) const;
bool HasAction(ax::mojom::Action action_enum) const;
// True if this is a web area, and its grandparent is a presentational iframe.
bool IsWebAreaForPresentationalIframe() const;
virtual bool IsClickable() const;
// See AXNodeData::IsTextField().
bool IsTextField() const;
// See AXNodeData::IsPasswordField().
bool IsPasswordField() const;
// See AXNodeData::IsPlainTextField().
bool IsPlainTextField() const;
// See AXNodeData::IsRichTextField().
bool IsRichTextField() const;
// Returns true if the accessible name was explicitly set to "" by the author
bool HasExplicitlyEmptyName() const;
// Get text to announce for a live region change, for ATs that do not
// implement this functionality.
std::string GetLiveRegionText() const;
// Creates a text position rooted at this object. Does not conver to a
// leaf text position - see CreatePositionForSelectionAt, below.
BrowserAccessibilityPosition::AXPositionInstance CreatePositionAt(
int offset,
ax::mojom::TextAffinity affinity =
ax::mojom::TextAffinity::kDownstream) const;
// |offset| could either be a text character or a child index in case of
// non-text objects. Converts to a leaf text position if you pass a
// character offset on a container node.
BrowserAccessibilityPosition::AXPositionInstance CreatePositionForSelectionAt(
int offset) const;
// Gets the text offsets where new lines start.
std::vector<int> GetLineStartOffsets() const;
gfx::NativeViewAccessible GetNativeViewAccessible() override;
// AXPosition Support
// Returns the text that is present inside this node, where the
// representation of text found in descendant nodes depends on the platform.
// For example some platforms may include descendant text while while other
// platforms may use a special character to represent descendant text.
// Prefer either GetHypertext or GetInnerText so it's clear which API is
// called.
// TODO(nektar): Move this method to AXNode when AXNodePosition and
// BrowserAccessibilityPosition are merged into one class.
virtual base::string16 GetText() const;
base::string16 GetNameAsString16() const;
// AXPlatformNodeDelegate.
base::string16 GetAuthorUniqueId() const override;
const ui::AXNodeData& GetData() const override;
const ui::AXTreeData& GetTreeData() const override;
const ui::AXTree::Selection GetUnignoredSelection() const override;
ui::AXNodePosition::AXPositionInstance CreateTextPositionAt(
int offset) const override;
gfx::NativeViewAccessible GetNSWindow() override;
gfx::NativeViewAccessible GetParent() override;
int GetChildCount() const override;
gfx::NativeViewAccessible ChildAtIndex(int index) override;
bool HasModalDialog() const override;
gfx::NativeViewAccessible GetFirstChild() override;
gfx::NativeViewAccessible GetLastChild() override;
gfx::NativeViewAccessible GetNextSibling() override;
gfx::NativeViewAccessible GetPreviousSibling() override;
bool IsChildOfLeaf() const override;
bool IsDescendantOfPlainTextField() const override;
bool IsLeaf() const override;
bool IsFocused() const override;
bool IsInvisibleOrIgnored() const override;
bool IsToplevelBrowserWindow() override;
gfx::NativeViewAccessible GetClosestPlatformObject() const override;
std::unique_ptr<ChildIterator> ChildrenBegin() override;
std::unique_ptr<ChildIterator> ChildrenEnd() override;
std::string GetName() const override;
base::string16 GetHypertext() const override;
bool SetHypertextSelection(int start_offset, int end_offset) override;
base::string16 GetInnerText() const override;
base::string16 GetValueForControl() const override;
gfx::Rect GetBoundsRect(
const ui::AXCoordinateSystem coordinate_system,
const ui::AXClippingBehavior clipping_behavior,
ui::AXOffscreenResult* offscreen_result = nullptr) const override;
gfx::Rect GetHypertextRangeBoundsRect(
const int start_offset,
const int end_offset,
const ui::AXCoordinateSystem coordinate_system,
const ui::AXClippingBehavior clipping_behavior,
ui::AXOffscreenResult* offscreen_result = nullptr) const override;
gfx::Rect GetInnerTextRangeBoundsRect(
const int start_offset,
const int end_offset,
const ui::AXCoordinateSystem coordinate_system,
const ui::AXClippingBehavior clipping_behavior,
ui::AXOffscreenResult* offscreen_result = nullptr) const override;
gfx::NativeViewAccessible HitTestSync(int physical_pixel_x,
int physical_pixel_y) const override;
gfx::NativeViewAccessible GetFocus() const override;
ui::AXPlatformNode* GetFromNodeID(int32_t id) override;
ui::AXPlatformNode* GetFromTreeIDAndNodeID(const ui::AXTreeID& ax_tree_id,
int32_t id) override;
int GetIndexInParent() override;
gfx::AcceleratedWidget GetTargetForNativeAccessibilityEvent() override;
base::Optional<int> FindTextBoundary(
ax::mojom::TextBoundary boundary,
int offset,
ax::mojom::MoveDirection direction,
ax::mojom::TextAffinity affinity) const override;
const std::vector<gfx::NativeViewAccessible> GetUIADescendants()
const override;
std::string GetLanguage() const override;
bool IsTable() const override;
base::Optional<int> GetTableColCount() const override;
base::Optional<int> GetTableRowCount() const override;
base::Optional<int> GetTableAriaColCount() const override;
base::Optional<int> GetTableAriaRowCount() const override;
base::Optional<int> GetTableCellCount() const override;
base::Optional<bool> GetTableHasColumnOrRowHeaderNode() const override;
std::vector<ui::AXNode::AXID> GetColHeaderNodeIds() const override;
std::vector<ui::AXNode::AXID> GetColHeaderNodeIds(
int col_index) const override;
std::vector<ui::AXNode::AXID> GetRowHeaderNodeIds() const override;
std::vector<ui::AXNode::AXID> GetRowHeaderNodeIds(
int row_index) const override;
ui::AXPlatformNode* GetTableCaption() const override;
bool IsTableRow() const override;
base::Optional<int> GetTableRowRowIndex() const override;
bool IsTableCellOrHeader() const override;
base::Optional<int> GetTableCellIndex() const override;
base::Optional<int> GetTableCellColIndex() const override;
base::Optional<int> GetTableCellRowIndex() const override;
base::Optional<int> GetTableCellColSpan() const override;
base::Optional<int> GetTableCellRowSpan() const override;
base::Optional<int> GetTableCellAriaColIndex() const override;
base::Optional<int> GetTableCellAriaRowIndex() const override;
base::Optional<int32_t> GetCellId(int row_index,
int col_index) const override;
base::Optional<int32_t> CellIndexToId(int cell_index) const override;
bool IsCellOrHeaderOfARIATable() const override;
bool IsCellOrHeaderOfARIAGrid() const override;
bool AccessibilityPerformAction(const ui::AXActionData& data) override;
base::string16 GetLocalizedStringForImageAnnotationStatus(
ax::mojom::ImageAnnotationStatus status) const override;
base::string16 GetLocalizedRoleDescriptionForUnlabeledImage() const override;
base::string16 GetLocalizedStringForLandmarkType() const override;
base::string16 GetLocalizedStringForRoleDescription() const override;
base::string16 GetStyleNameAttributeAsLocalizedString() const override;
ui::TextAttributeMap ComputeTextAttributeMap(
const ui::TextAttributeList& default_attributes) const override;
std::string GetInheritedFontFamilyName() const override;
bool ShouldIgnoreHoveredStateForTesting() override;
bool IsOffscreen() const override;
bool IsMinimized() const override;
bool IsText() const override;
bool IsWebContent() const override;
bool HasVisibleCaretOrSelection() const override;
ui::AXPlatformNode* GetTargetNodeForRelation(
ax::mojom::IntAttribute attr) override;
std::vector<ui::AXPlatformNode*> GetTargetNodesForRelation(
ax::mojom::IntListAttribute attr) override;
std::set<ui::AXPlatformNode*> GetReverseRelations(
ax::mojom::IntAttribute attr) override;
std::set<ui::AXPlatformNode*> GetReverseRelations(
ax::mojom::IntListAttribute attr) override;
bool IsOrderedSetItem() const override;
bool IsOrderedSet() const override;
base::Optional<int> GetPosInSet() const override;
base::Optional<int> GetSetSize() const override;
// Returns true if this node is a list marker or if it's a descendant
// of a list marker node. Returns false otherwise.
bool IsInListMarker() const;
// Returns true if this node is a collapsed popup button that is parent to a
// menu list popup.
bool IsCollapsedMenuListPopUpButton() const;
// Returns the popup button ancestor of this current node if any. The popup
// button needs to be the parent of a menu list popup and needs to be
// collapsed.
BrowserAccessibility* GetCollapsedMenuListPopUpButtonAncestor() const;
// If this node is within an editable region, returns the node that is at the
// root of that editable region, otherwise returns nullptr. In accessibility,
// an editable region is synonymous to a text field.
BrowserAccessibility* GetTextFieldAncestor() const;
// Returns true if:
// 1. This node is a list, AND
// 2. This node has a list ancestor or a list descendant.
bool IsHierarchicalList() const;
// Returns a string representation of this object for debugging purposes.
std::string ToString() const;
// The UIA tree formatter needs access to GetUniqueId() to identify the
// starting point for tree dumps.
friend class AccessibilityTreeFormatterUia;
using BrowserAccessibilityPositionInstance =
using AXPlatformRange =
virtual ui::TextAttributeList ComputeTextAttributes() const;
// The manager of this tree of accessibility objects.
BrowserAccessibilityManager* manager_ = nullptr;
// The underlying node.
ui::AXNode* node_ = nullptr;
// Protected so that it can't be called directly on a BrowserAccessibility
// where it could be confused with an id that comes from the node data,
// which is only unique to the Blink process.
// Does need to be called by subclasses such as BrowserAccessibilityAndroid.
const ui::AXUniqueId& GetUniqueId() const override;
// Returns a text attribute map indicating the offsets in the text of a leaf
// object, such as a text field or static text, where spelling and grammar
// errors are present.
ui::TextAttributeMap GetSpellingAndGrammarAttributes() const;
std::string SubtreeToStringHelper(size_t level) override;
// Return the bounds after converting from this node's coordinate system
// (which is relative to its nearest scrollable ancestor) to the coordinate
// system specified. If the clipping behavior is set to clipped, clipping is
// applied to all bounding boxes so that the resulting rect is within the
// window. If the clipping behavior is unclipped, the resulting rect may be
// outside of the window or offscreen. If an offscreen result address is
// provided, it will be populated depending on whether the returned bounding
// box is onscreen or offscreen.
gfx::Rect RelativeToAbsoluteBounds(
gfx::RectF bounds,
const ui::AXCoordinateSystem coordinate_system,
const ui::AXClippingBehavior clipping_behavior,
ui::AXOffscreenResult* offscreen_result) const;
// Return a rect for a 1-width character past the end of text. This is what
// ATs expect when getting the character extents past the last character in
// a line, and equals what the caret bounds would be when past the end of
// the text.
gfx::Rect GetRootFrameHypertextBoundsPastEndOfText(
const ui::AXClippingBehavior clipping_behavior,
ui::AXOffscreenResult* offscreen_result = nullptr) const;
// Return the bounds of inline text in this node's coordinate system (which
// is relative to its container node specified in AXRelativeBounds).
gfx::RectF GetInlineTextRect(const int start_offset,
const int end_offset,
const int max_length) const;
// Recursive helper function for GetInnerTextRangeBounds.
gfx::Rect GetInnerTextRangeBoundsRectInSubtree(
const int start_offset,
const int end_offset,
const ui::AXCoordinateSystem coordinate_system,
const ui::AXClippingBehavior clipping_behavior,
ui::AXOffscreenResult* offscreen_result) const;
// Given a set of node ids, return the nodes in this delegate's tree to
// which they correspond.
std::set<ui::AXPlatformNode*> GetNodesForNodeIdSet(
const std::set<int32_t>& ids);
// If the node has a child tree, get the root node.
BrowserAccessibility* PlatformGetRootOfChildTree() const;
// Given a set of map of spelling text attributes and a start offset, merge
// them into the given map of existing text attributes. Merges the given
// spelling attributes, i.e. document marker information, into the given
// text attributes starting at the given character offset. This is required
// because document markers that are present on text leaves need to be
// propagated to their parent object for compatibility with Firefox.
static void MergeSpellingAndGrammarIntoTextAttributes(
const ui::TextAttributeMap& spelling_attributes,
int start_offset,
ui::TextAttributeMap* text_attributes);
// Return true is the list of text attributes already includes an invalid
// attribute originating from ARIA.
static bool HasInvalidAttribute(const ui::TextAttributeList& attributes);
// A unique ID, since node IDs are frame-local.
ui::AXUniqueId unique_id_;
} // namespace content