Attachment 359863 Details for Bug 193348 – patch

[patch] patch

patch (text/plain), 105.70 KB, created by chris fleizach on 2019-01-23 02:15:57 PST

(hide)

Description:

Filename:

MIME Type:

Creator: chris fleizach

Created: 2019-01-23 02:15:57 PST

Size: 105.70 KB

patch

obsolete

>Index: Source/JavaScriptCore/ChangeLog
>===================================================================
>--- Source/JavaScriptCore/ChangeLog	(revision 240246)
>+++ Source/JavaScriptCore/ChangeLog	(working copy)
>@@ -1,3 +1,13 @@
>+2019-01-11  Chris Fleizach  <cfleizach@apple.com>
>+
>+        AX: Introduce a static accessibility tree
>+        https://bugs.webkit.org/show_bug.cgi?id=193348
>+        <rdar://problem/47203295>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Configurations/FeatureDefines.xcconfig:
>+
> 2019-01-21  Yusuke Suzuki  <ysuzuki@apple.com>
> 
>         [JSC] StrictModeTypeErrorFunction is no longer used
>Index: Source/JavaScriptCore/Configurations/FeatureDefines.xcconfig
>===================================================================
>--- Source/JavaScriptCore/Configurations/FeatureDefines.xcconfig	(revision 240206)
>+++ Source/JavaScriptCore/Configurations/FeatureDefines.xcconfig	(working copy)
>@@ -40,6 +40,8 @@
> ENABLE_ACCELERATED_OVERFLOW_SCROLLING = $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING_$(WK_COCOA_TOUCH));
> ENABLE_ACCELERATED_OVERFLOW_SCROLLING_cocoatouch = ENABLE_ACCELERATED_OVERFLOW_SCROLLING;
> 
>+ENABLE_ACCESSIBILITY_ISOLATED_TREE = ;
>+
> ENABLE_APPLE_PAY = $(ENABLE_APPLE_PAY_$(WK_PLATFORM_NAME));
> ENABLE_APPLE_PAY_iphoneos = ENABLE_APPLE_PAY;
> ENABLE_APPLE_PAY_iphonesimulator = ENABLE_APPLE_PAY;
>@@ -406,4 +408,4 @@
> 
> ENABLE_XSLT = ENABLE_XSLT;
> 
>-FEATURE_DEFINES = $(ENABLE_3D_TRANSFORMS) $(ENABLE_ACCELERATED_2D_CANVAS) $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING) $(ENABLE_APPLE_PAY) $(ENABLE_APPLE_PAY_SESSION_V3) $(ENABLE_APPLE_PAY_SESSION_V4) $(ENABLE_APPLICATION_MANIFEST) $(ENABLE_ATTACHMENT_ELEMENT) $(ENABLE_AVF_CAPTIONS) $(ENABLE_C_LOOP) $(ENABLE_CACHE_PARTITIONING) $(ENABLE_CHANNEL_MESSAGING) $(ENABLE_CONTENT_FILTERING) $(ENABLE_CSS3_TEXT) $(ENABLE_CSS_BOX_DECORATION_BREAK) $(ENABLE_CSS_COMPOSITING) $(ENABLE_CSS_DEVICE_ADAPTATION) $(ENABLE_CSS_IMAGE_ORIENTATION) $(ENABLE_CSS_IMAGE_RESOLUTION) $(ENABLE_CSS_PAINTING_API) $(ENABLE_CSS_SCROLL_SNAP) $(ENABLE_CSS_SELECTORS_LEVEL4) $(ENABLE_CSS_TRAILING_WORD) $(ENABLE_CSS_TYPED_OM) $(ENABLE_CURSOR_VISIBILITY) $(ENABLE_CUSTOM_SCHEME_HANDLER) $(ENABLE_CSS_CONIC_GRADIENTS) $(ENABLE_DARK_MODE_CSS) $(ENABLE_DASHBOARD_SUPPORT) $(ENABLE_DATA_INTERACTION) $(ENABLE_DATACUE_VALUE) $(ENABLE_DATALIST_ELEMENT) $(ENABLE_DEVICE_ORIENTATION) $(ENABLE_DRAG_SUPPORT) $(ENABLE_ENCRYPTED_MEDIA) $(ENABLE_EXPERIMENTAL_FEATURES) $(ENABLE_FAST_JIT_PERMISSIONS) $(ENABLE_FILTERS_LEVEL_2) $(ENABLE_FTL_JIT) $(ENABLE_FULLSCREEN_API) $(ENABLE_GAMEPAD) $(ENABLE_GEOLOCATION) $(ENABLE_ICONDATABASE) $(ENABLE_INDEXED_DATABASE) $(ENABLE_INDEXED_DATABASE_IN_WORKERS) $(ENABLE_INPUT_TYPE_COLOR) $(ENABLE_INPUT_TYPE_DATE) $(ENABLE_INPUT_TYPE_DATETIME_INCOMPLETE) $(ENABLE_INPUT_TYPE_DATETIMELOCAL) $(ENABLE_INPUT_TYPE_MONTH) $(ENABLE_INPUT_TYPE_TIME) $(ENABLE_INPUT_TYPE_WEEK) $(ENABLE_INTERSECTION_OBSERVER) $(ENABLE_INTL) $(ENABLE_IOS_GESTURE_EVENTS) $(ENABLE_IOS_TOUCH_EVENTS) $(ENABLE_JIT) $(ENABLE_KEYBOARD_CODE_ATTRIBUTE) $(ENABLE_KEYBOARD_KEY_ATTRIBUTE) $(ENABLE_LAYOUT_FORMATTING_CONTEXT) $(ENABLE_LEGACY_CSS_VENDOR_PREFIXES) $(ENABLE_LEGACY_CUSTOM_PROTOCOL_MANAGER) $(ENABLE_LEGACY_ENCRYPTED_MEDIA) $(ENABLE_LETTERPRESS) $(ENABLE_MAC_GESTURE_EVENTS) $(ENABLE_MAC_VIDEO_TOOLBOX) $(ENABLE_MATHML) $(ENABLE_MEDIA_CAPTURE) $(ENABLE_MEDIA_CONTROLS_SCRIPT) $(ENABLE_MEDIA_SESSION) $(ENABLE_MEDIA_SOURCE) $(ENABLE_MEDIA_STATISTICS) $(ENABLE_MEDIA_STREAM) $(ENABLE_METER_ELEMENT) $(ENABLE_MHTML) $(ENABLE_MOUSE_CURSOR_SCALE) $(ENABLE_NAVIGATOR_CONTENT_UTILS) $(ENABLE_NAVIGATOR_STANDALONE) $(ENABLE_NOTIFICATIONS) $(ENABLE_PAYMENT_REQUEST) $(ENABLE_PDFKIT_PLUGIN) $(ENABLE_POINTER_EVENTS) $(ENABLE_POINTER_LOCK) $(ENABLE_PUBLIC_SUFFIX_LIST) $(ENABLE_QUOTA) $(ENABLE_REMOTE_INSPECTOR) $(ENABLE_RESOLUTION_MEDIA_QUERY) $(ENABLE_RESOURCE_LOAD_STATISTICS) $(ENABLE_RESOURCE_USAGE) $(ENABLE_RUBBER_BANDING) $(ENABLE_SERVICE_CONTROLS) $(ENABLE_SERVICE_WORKER) $(ENABLE_SPEECH_SYNTHESIS) $(ENABLE_STREAMS_API) $(ENABLE_WEB_CRYPTO) $(ENABLE_SVG_FONTS) $(ENABLE_TELEPHONE_NUMBER_DETECTION) $(ENABLE_TEXT_AUTOSIZING) $(ENABLE_TOUCH_EVENTS) $(ENABLE_USER_MESSAGE_HANDLERS) $(ENABLE_USERSELECT_ALL) $(ENABLE_VARIATION_FONTS) $(ENABLE_VIDEO) $(ENABLE_VIDEO_PRESENTATION_MODE) $(ENABLE_VIDEO_TRACK) $(ENABLE_VIDEO_USES_ELEMENT_FULLSCREEN) $(ENABLE_WEB_API_STATISTICS) $(ENABLE_WEB_AUDIO) $(ENABLE_WEB_AUTHN) $(ENABLE_WEB_RTC) $(ENABLE_WEBASSEMBLY) $(ENABLE_WEBASSEMBLY_STREAMING_API) $(ENABLE_WEBGL) $(ENABLE_WEBGL2) $(ENABLE_WEBGPU) $(ENABLE_WEBMETAL) $(ENABLE_WIRELESS_PLAYBACK_TARGET) $(ENABLE_XSLT);
>+FEATURE_DEFINES = $(ENABLE_3D_TRANSFORMS) $(ENABLE_ACCELERATED_2D_CANVAS) $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING) $(ENABLE_ACCESSIBILITY_ISOLATED_TREE) $(ENABLE_APPLE_PAY) $(ENABLE_APPLE_PAY_SESSION_V3) $(ENABLE_APPLE_PAY_SESSION_V4) $(ENABLE_APPLICATION_MANIFEST) $(ENABLE_ATTACHMENT_ELEMENT) $(ENABLE_AVF_CAPTIONS) $(ENABLE_C_LOOP) $(ENABLE_CACHE_PARTITIONING) $(ENABLE_CHANNEL_MESSAGING) $(ENABLE_CONTENT_FILTERING) $(ENABLE_CSS3_TEXT) $(ENABLE_CSS_BOX_DECORATION_BREAK) $(ENABLE_CSS_COMPOSITING) $(ENABLE_CSS_DEVICE_ADAPTATION) $(ENABLE_CSS_IMAGE_ORIENTATION) $(ENABLE_CSS_IMAGE_RESOLUTION) $(ENABLE_CSS_PAINTING_API) $(ENABLE_CSS_SCROLL_SNAP) $(ENABLE_CSS_SELECTORS_LEVEL4) $(ENABLE_CSS_TRAILING_WORD) $(ENABLE_CSS_TYPED_OM) $(ENABLE_CURSOR_VISIBILITY) $(ENABLE_CUSTOM_SCHEME_HANDLER) $(ENABLE_CSS_CONIC_GRADIENTS) $(ENABLE_DARK_MODE_CSS) $(ENABLE_DASHBOARD_SUPPORT) $(ENABLE_DATA_INTERACTION) $(ENABLE_DATACUE_VALUE) $(ENABLE_DATALIST_ELEMENT) $(ENABLE_DEVICE_ORIENTATION) $(ENABLE_DRAG_SUPPORT) $(ENABLE_ENCRYPTED_MEDIA) $(ENABLE_EXPERIMENTAL_FEATURES) $(ENABLE_FAST_JIT_PERMISSIONS) $(ENABLE_FILTERS_LEVEL_2) $(ENABLE_FTL_JIT) $(ENABLE_FULLSCREEN_API) $(ENABLE_GAMEPAD) $(ENABLE_GEOLOCATION) $(ENABLE_ICONDATABASE) $(ENABLE_INDEXED_DATABASE) $(ENABLE_INDEXED_DATABASE_IN_WORKERS) $(ENABLE_INPUT_TYPE_COLOR) $(ENABLE_INPUT_TYPE_DATE) $(ENABLE_INPUT_TYPE_DATETIME_INCOMPLETE) $(ENABLE_INPUT_TYPE_DATETIMELOCAL) $(ENABLE_INPUT_TYPE_MONTH) $(ENABLE_INPUT_TYPE_TIME) $(ENABLE_INPUT_TYPE_WEEK) $(ENABLE_INTERSECTION_OBSERVER) $(ENABLE_INTL) $(ENABLE_IOS_GESTURE_EVENTS) $(ENABLE_IOS_TOUCH_EVENTS) $(ENABLE_JIT) $(ENABLE_KEYBOARD_CODE_ATTRIBUTE) $(ENABLE_KEYBOARD_KEY_ATTRIBUTE) $(ENABLE_LAYOUT_FORMATTING_CONTEXT) $(ENABLE_LEGACY_CSS_VENDOR_PREFIXES) $(ENABLE_LEGACY_CUSTOM_PROTOCOL_MANAGER) $(ENABLE_LEGACY_ENCRYPTED_MEDIA) $(ENABLE_LETTERPRESS) $(ENABLE_MAC_GESTURE_EVENTS) $(ENABLE_MAC_VIDEO_TOOLBOX) $(ENABLE_MATHML) $(ENABLE_MEDIA_CAPTURE) $(ENABLE_MEDIA_CONTROLS_SCRIPT) $(ENABLE_MEDIA_SESSION) $(ENABLE_MEDIA_SOURCE) $(ENABLE_MEDIA_STATISTICS) $(ENABLE_MEDIA_STREAM) $(ENABLE_METER_ELEMENT) $(ENABLE_MHTML) $(ENABLE_MOUSE_CURSOR_SCALE) $(ENABLE_NAVIGATOR_CONTENT_UTILS) $(ENABLE_NAVIGATOR_STANDALONE) $(ENABLE_NOTIFICATIONS) $(ENABLE_PAYMENT_REQUEST) $(ENABLE_PDFKIT_PLUGIN) $(ENABLE_POINTER_EVENTS) $(ENABLE_POINTER_LOCK) $(ENABLE_PUBLIC_SUFFIX_LIST) $(ENABLE_QUOTA) $(ENABLE_REMOTE_INSPECTOR) $(ENABLE_RESOLUTION_MEDIA_QUERY) $(ENABLE_RESOURCE_LOAD_STATISTICS) $(ENABLE_RESOURCE_USAGE) $(ENABLE_RUBBER_BANDING) $(ENABLE_SERVICE_CONTROLS) $(ENABLE_SERVICE_WORKER) $(ENABLE_SPEECH_SYNTHESIS) $(ENABLE_STREAMS_API) $(ENABLE_WEB_CRYPTO) $(ENABLE_SVG_FONTS) $(ENABLE_TELEPHONE_NUMBER_DETECTION) $(ENABLE_TEXT_AUTOSIZING) $(ENABLE_TOUCH_EVENTS) $(ENABLE_USER_MESSAGE_HANDLERS) $(ENABLE_USERSELECT_ALL) $(ENABLE_VARIATION_FONTS) $(ENABLE_VIDEO) $(ENABLE_VIDEO_PRESENTATION_MODE) $(ENABLE_VIDEO_TRACK) $(ENABLE_VIDEO_USES_ELEMENT_FULLSCREEN) $(ENABLE_WEB_API_STATISTICS) $(ENABLE_WEB_AUDIO) $(ENABLE_WEB_AUTHN) $(ENABLE_WEB_RTC) $(ENABLE_WEBASSEMBLY) $(ENABLE_WEBASSEMBLY_STREAMING_API) $(ENABLE_WEBGL) $(ENABLE_WEBGL2) $(ENABLE_WEBGPU) $(ENABLE_WEBMETAL) $(ENABLE_WIRELESS_PLAYBACK_TARGET) $(ENABLE_XSLT);
>Index: Source/WebCore/CMakeLists.txt
>===================================================================
>--- Source/WebCore/CMakeLists.txt	(revision 240246)
>+++ Source/WebCore/CMakeLists.txt	(working copy)
>@@ -58,6 +58,7 @@
>     "${WEBCORE_DIR}/Modules/websockets"
>     "${WEBCORE_DIR}/Modules/webvr"
>     "${WEBCORE_DIR}/accessibility"
>+    "${WEBCORE_DIR}/accessibility/isolatedtree"
>     "${WEBCORE_DIR}/animation"
>     "${WEBCORE_DIR}/bindings"
>     "${WEBCORE_DIR}/bindings/js"
>Index: Source/WebCore/ChangeLog
>===================================================================
>--- Source/WebCore/ChangeLog	(revision 240246)
>+++ Source/WebCore/ChangeLog	(working copy)
>@@ -1,3 +1,82 @@
>+2019-01-23  Chris Fleizach  <cfleizach@apple.com>
>+
>+        AX: Introduce a static accessibility tree
>+        https://bugs.webkit.org/show_bug.cgi?id=193348
>+        <rdar://problem/47203295>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        In order to improve performance when requesting the accessibility hierarchy, we introduce the idea of a "static accessibility tree" which 
>+        could be accessed on a different thread by assistive technologies.
>+        That is accomplished by storing all the data needed to answer accessibility attribute queries in a static object that mirrors the 
>+        "live" AccessibilityObjects (which interact with both DOM and Render trees).
>+        These static objects are generally created after layout is done and final tasks are being performed. They are then stored in the static tree 
>+        representation and able to be read from anywhere.
>+        Tactically this is done with AXIsolatedTreeNodes inside of an AXIsolatedTree. The TreeNodes implement an AccessibilityObjectInterface shared 
>+        with AccessibilityObject.
>+        This allows the wrappers to access either one depending on conditions and platforms without significant code duplication or re-organization.
>+
>+        * CMakeLists.txt:
>+        * Configurations/FeatureDefines.xcconfig:
>+        * Sources.txt:
>+        * WebCore.xcodeproj/project.pbxproj:
>+        * accessibility/AXObjectCache.cpp:
>+        (WebCore::AXObjectCache::remove):
>+        (WebCore::AXObjectCache::createIsolatedAccessibilityTree):
>+        (WebCore::AXObjectCache::generateStaticAccessibilityTreeIfNeeded):
>+        * accessibility/AXObjectCache.h:
>+        * accessibility/AccessibilityObject.h:
>+        * accessibility/AccessibilityObjectInterface.h: Added.
>+        * accessibility/isolatedtree: Added.
>+        * accessibility/isolatedtree/AXIsolatedTree.cpp: Added.
>+        (WebCore::AXIsolatedTree::treeCache):
>+        (WebCore::AXIsolatedTree::AXIsolatedTree):
>+        (WebCore::AXIsolatedTree::create):
>+        (WebCore::AXIsolatedTree::treeForID):
>+        (WebCore::AXIsolatedTree::treeForPageID):
>+        (WebCore::AXIsolatedTree::nodeForID const):
>+        (WebCore::AXIsolatedTree::rootNode):
>+        (WebCore::AXIsolatedTree::removeNode):
>+        (WebCore::AXIsolatedTree::appendNodeChanges):
>+        (WebCore::AXIsolatedTree::applyPendingChanges):
>+        * accessibility/isolatedtree/AXIsolatedTree.h: Added.
>+        (WebCore::AXIsolatedTree::treeIdentifier const):
>+        * accessibility/isolatedtree/AXIsolatedTreeNode.cpp: Added.
>+        (WebCore::AXIsolatedTreeNode::AXIsolatedTreeNode):
>+        (WebCore::AXIsolatedTreeNode::create):
>+        (WebCore::AXIsolatedTreeNode::initializeAttributeData):
>+        (WebCore::AXIsolatedTreeNode::setProperty):
>+        (WebCore::AXIsolatedTreeNode::doubleAttributeValue const):
>+        (WebCore::AXIsolatedTreeNode::unsignedAttributeValue const):
>+        (WebCore::AXIsolatedTreeNode::boolAttributeValue const):
>+        (WebCore::AXIsolatedTreeNode::stringAttributeValue const):
>+        (WebCore::AXIsolatedTreeNode::intAttributeValue const):
>+        * accessibility/isolatedtree/AXIsolatedTreeNode.h: Added.
>+        (WebCore::AXIsolatedTreeRelationship::create):
>+        (WebCore::AXIsolatedTreeRelationship::AXIsolatedTreeRelationship):
>+        (WebCore::AXIsolatedTreeRelationship::operator=):
>+        (WebCore::AXIsolatedTreeRelationship::setParent):
>+        (WebCore::AXIsolatedTreeRelationship::parent const):
>+        (WebCore::AXIsolatedTreeRelationship::children):
>+        * accessibility/mac/AXObjectCacheMac.mm:
>+        (WebCore::AXObjectCache::associateIsolatedTreeNode):
>+        * accessibility/mac/WebAccessibilityObjectWrapperBase.h:
>+        * accessibility/mac/WebAccessibilityObjectWrapperBase.mm:
>+        (-[WebAccessibilityObjectWrapperBase initWithAccessibilityObject:]):
>+        (-[WebAccessibilityObjectWrapperBase isolatedTreeNode]):
>+        (-[WebAccessibilityObjectWrapperBase detach]):
>+        (-[WebAccessibilityObjectWrapperBase updateObjectBackingStore]):
>+        (-[WebAccessibilityObjectWrapperBase axBackingObject]):
>+        (-[WebAccessibilityObjectWrapperBase baseAccessibilityDescription]):
>+        * accessibility/mac/WebAccessibilityObjectWrapperMac.mm:
>+        (-[WebAccessibilityObjectWrapper role]):
>+        (-[WebAccessibilityObjectWrapper subrole]):
>+        (-[WebAccessibilityObjectWrapper roleDescription]):
>+        (-[WebAccessibilityObjectWrapper accessibilityAttributeValue:]):
>+        * dom/Document.cpp:
>+        (WebCore::Document::pageID const):
>+        * dom/Document.h:
>+
> 2019-01-21  Brent Fulgham  <bfulgham@apple.com>
> 
>         Implement message handlers for NetworkProcess-based ResourceLoadStatistics
>Index: Source/WebCore/Configurations/FeatureDefines.xcconfig
>===================================================================
>--- Source/WebCore/Configurations/FeatureDefines.xcconfig	(revision 240206)
>+++ Source/WebCore/Configurations/FeatureDefines.xcconfig	(working copy)
>@@ -40,6 +40,8 @@
> ENABLE_ACCELERATED_OVERFLOW_SCROLLING = $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING_$(WK_COCOA_TOUCH));
> ENABLE_ACCELERATED_OVERFLOW_SCROLLING_cocoatouch = ENABLE_ACCELERATED_OVERFLOW_SCROLLING;
> 
>+ENABLE_ACCESSIBILITY_ISOLATED_TREE = ;
>+
> ENABLE_APPLE_PAY = $(ENABLE_APPLE_PAY_$(WK_PLATFORM_NAME));
> ENABLE_APPLE_PAY_iphoneos = ENABLE_APPLE_PAY;
> ENABLE_APPLE_PAY_iphonesimulator = ENABLE_APPLE_PAY;
>@@ -406,4 +408,4 @@
> 
> ENABLE_XSLT = ENABLE_XSLT;
> 
>-FEATURE_DEFINES = $(ENABLE_3D_TRANSFORMS) $(ENABLE_ACCELERATED_2D_CANVAS) $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING) $(ENABLE_APPLE_PAY) $(ENABLE_APPLE_PAY_SESSION_V3) $(ENABLE_APPLE_PAY_SESSION_V4) $(ENABLE_APPLICATION_MANIFEST) $(ENABLE_ATTACHMENT_ELEMENT) $(ENABLE_AVF_CAPTIONS) $(ENABLE_C_LOOP) $(ENABLE_CACHE_PARTITIONING) $(ENABLE_CHANNEL_MESSAGING) $(ENABLE_CONTENT_FILTERING) $(ENABLE_CSS3_TEXT) $(ENABLE_CSS_BOX_DECORATION_BREAK) $(ENABLE_CSS_COMPOSITING) $(ENABLE_CSS_DEVICE_ADAPTATION) $(ENABLE_CSS_IMAGE_ORIENTATION) $(ENABLE_CSS_IMAGE_RESOLUTION) $(ENABLE_CSS_PAINTING_API) $(ENABLE_CSS_SCROLL_SNAP) $(ENABLE_CSS_SELECTORS_LEVEL4) $(ENABLE_CSS_TRAILING_WORD) $(ENABLE_CSS_TYPED_OM) $(ENABLE_CURSOR_VISIBILITY) $(ENABLE_CUSTOM_SCHEME_HANDLER) $(ENABLE_CSS_CONIC_GRADIENTS) $(ENABLE_DARK_MODE_CSS) $(ENABLE_DASHBOARD_SUPPORT) $(ENABLE_DATA_INTERACTION) $(ENABLE_DATACUE_VALUE) $(ENABLE_DATALIST_ELEMENT) $(ENABLE_DEVICE_ORIENTATION) $(ENABLE_DRAG_SUPPORT) $(ENABLE_ENCRYPTED_MEDIA) $(ENABLE_EXPERIMENTAL_FEATURES) $(ENABLE_FAST_JIT_PERMISSIONS) $(ENABLE_FILTERS_LEVEL_2) $(ENABLE_FTL_JIT) $(ENABLE_FULLSCREEN_API) $(ENABLE_GAMEPAD) $(ENABLE_GEOLOCATION) $(ENABLE_ICONDATABASE) $(ENABLE_INDEXED_DATABASE) $(ENABLE_INDEXED_DATABASE_IN_WORKERS) $(ENABLE_INPUT_TYPE_COLOR) $(ENABLE_INPUT_TYPE_DATE) $(ENABLE_INPUT_TYPE_DATETIME_INCOMPLETE) $(ENABLE_INPUT_TYPE_DATETIMELOCAL) $(ENABLE_INPUT_TYPE_MONTH) $(ENABLE_INPUT_TYPE_TIME) $(ENABLE_INPUT_TYPE_WEEK) $(ENABLE_INTERSECTION_OBSERVER) $(ENABLE_INTL) $(ENABLE_IOS_GESTURE_EVENTS) $(ENABLE_IOS_TOUCH_EVENTS) $(ENABLE_JIT) $(ENABLE_KEYBOARD_CODE_ATTRIBUTE) $(ENABLE_KEYBOARD_KEY_ATTRIBUTE) $(ENABLE_LAYOUT_FORMATTING_CONTEXT) $(ENABLE_LEGACY_CSS_VENDOR_PREFIXES) $(ENABLE_LEGACY_CUSTOM_PROTOCOL_MANAGER) $(ENABLE_LEGACY_ENCRYPTED_MEDIA) $(ENABLE_LETTERPRESS) $(ENABLE_MAC_GESTURE_EVENTS) $(ENABLE_MAC_VIDEO_TOOLBOX) $(ENABLE_MATHML) $(ENABLE_MEDIA_CAPTURE) $(ENABLE_MEDIA_CONTROLS_SCRIPT) $(ENABLE_MEDIA_SESSION) $(ENABLE_MEDIA_SOURCE) $(ENABLE_MEDIA_STATISTICS) $(ENABLE_MEDIA_STREAM) $(ENABLE_METER_ELEMENT) $(ENABLE_MHTML) $(ENABLE_MOUSE_CURSOR_SCALE) $(ENABLE_NAVIGATOR_CONTENT_UTILS) $(ENABLE_NAVIGATOR_STANDALONE) $(ENABLE_NOTIFICATIONS) $(ENABLE_PAYMENT_REQUEST) $(ENABLE_PDFKIT_PLUGIN) $(ENABLE_POINTER_EVENTS) $(ENABLE_POINTER_LOCK) $(ENABLE_PUBLIC_SUFFIX_LIST) $(ENABLE_QUOTA) $(ENABLE_REMOTE_INSPECTOR) $(ENABLE_RESOLUTION_MEDIA_QUERY) $(ENABLE_RESOURCE_LOAD_STATISTICS) $(ENABLE_RESOURCE_USAGE) $(ENABLE_RUBBER_BANDING) $(ENABLE_SERVICE_CONTROLS) $(ENABLE_SERVICE_WORKER) $(ENABLE_SPEECH_SYNTHESIS) $(ENABLE_STREAMS_API) $(ENABLE_WEB_CRYPTO) $(ENABLE_SVG_FONTS) $(ENABLE_TELEPHONE_NUMBER_DETECTION) $(ENABLE_TEXT_AUTOSIZING) $(ENABLE_TOUCH_EVENTS) $(ENABLE_USER_MESSAGE_HANDLERS) $(ENABLE_USERSELECT_ALL) $(ENABLE_VARIATION_FONTS) $(ENABLE_VIDEO) $(ENABLE_VIDEO_PRESENTATION_MODE) $(ENABLE_VIDEO_TRACK) $(ENABLE_VIDEO_USES_ELEMENT_FULLSCREEN) $(ENABLE_WEB_API_STATISTICS) $(ENABLE_WEB_AUDIO) $(ENABLE_WEB_AUTHN) $(ENABLE_WEB_RTC) $(ENABLE_WEBASSEMBLY) $(ENABLE_WEBASSEMBLY_STREAMING_API) $(ENABLE_WEBGL) $(ENABLE_WEBGL2) $(ENABLE_WEBGPU) $(ENABLE_WEBMETAL) $(ENABLE_WIRELESS_PLAYBACK_TARGET) $(ENABLE_XSLT);
>+FEATURE_DEFINES = $(ENABLE_3D_TRANSFORMS) $(ENABLE_ACCELERATED_2D_CANVAS) $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING) $(ENABLE_ACCESSIBILITY_ISOLATED_TREE) $(ENABLE_APPLE_PAY) $(ENABLE_APPLE_PAY_SESSION_V3) $(ENABLE_APPLE_PAY_SESSION_V4) $(ENABLE_APPLICATION_MANIFEST) $(ENABLE_ATTACHMENT_ELEMENT) $(ENABLE_AVF_CAPTIONS) $(ENABLE_C_LOOP) $(ENABLE_CACHE_PARTITIONING) $(ENABLE_CHANNEL_MESSAGING) $(ENABLE_CONTENT_FILTERING) $(ENABLE_CSS3_TEXT) $(ENABLE_CSS_BOX_DECORATION_BREAK) $(ENABLE_CSS_COMPOSITING) $(ENABLE_CSS_DEVICE_ADAPTATION) $(ENABLE_CSS_IMAGE_ORIENTATION) $(ENABLE_CSS_IMAGE_RESOLUTION) $(ENABLE_CSS_PAINTING_API) $(ENABLE_CSS_SCROLL_SNAP) $(ENABLE_CSS_SELECTORS_LEVEL4) $(ENABLE_CSS_TRAILING_WORD) $(ENABLE_CSS_TYPED_OM) $(ENABLE_CURSOR_VISIBILITY) $(ENABLE_CUSTOM_SCHEME_HANDLER) $(ENABLE_CSS_CONIC_GRADIENTS) $(ENABLE_DARK_MODE_CSS) $(ENABLE_DASHBOARD_SUPPORT) $(ENABLE_DATA_INTERACTION) $(ENABLE_DATACUE_VALUE) $(ENABLE_DATALIST_ELEMENT) $(ENABLE_DEVICE_ORIENTATION) $(ENABLE_DRAG_SUPPORT) $(ENABLE_ENCRYPTED_MEDIA) $(ENABLE_EXPERIMENTAL_FEATURES) $(ENABLE_FAST_JIT_PERMISSIONS) $(ENABLE_FILTERS_LEVEL_2) $(ENABLE_FTL_JIT) $(ENABLE_FULLSCREEN_API) $(ENABLE_GAMEPAD) $(ENABLE_GEOLOCATION) $(ENABLE_ICONDATABASE) $(ENABLE_INDEXED_DATABASE) $(ENABLE_INDEXED_DATABASE_IN_WORKERS) $(ENABLE_INPUT_TYPE_COLOR) $(ENABLE_INPUT_TYPE_DATE) $(ENABLE_INPUT_TYPE_DATETIME_INCOMPLETE) $(ENABLE_INPUT_TYPE_DATETIMELOCAL) $(ENABLE_INPUT_TYPE_MONTH) $(ENABLE_INPUT_TYPE_TIME) $(ENABLE_INPUT_TYPE_WEEK) $(ENABLE_INTERSECTION_OBSERVER) $(ENABLE_INTL) $(ENABLE_IOS_GESTURE_EVENTS) $(ENABLE_IOS_TOUCH_EVENTS) $(ENABLE_JIT) $(ENABLE_KEYBOARD_CODE_ATTRIBUTE) $(ENABLE_KEYBOARD_KEY_ATTRIBUTE) $(ENABLE_LAYOUT_FORMATTING_CONTEXT) $(ENABLE_LEGACY_CSS_VENDOR_PREFIXES) $(ENABLE_LEGACY_CUSTOM_PROTOCOL_MANAGER) $(ENABLE_LEGACY_ENCRYPTED_MEDIA) $(ENABLE_LETTERPRESS) $(ENABLE_MAC_GESTURE_EVENTS) $(ENABLE_MAC_VIDEO_TOOLBOX) $(ENABLE_MATHML) $(ENABLE_MEDIA_CAPTURE) $(ENABLE_MEDIA_CONTROLS_SCRIPT) $(ENABLE_MEDIA_SESSION) $(ENABLE_MEDIA_SOURCE) $(ENABLE_MEDIA_STATISTICS) $(ENABLE_MEDIA_STREAM) $(ENABLE_METER_ELEMENT) $(ENABLE_MHTML) $(ENABLE_MOUSE_CURSOR_SCALE) $(ENABLE_NAVIGATOR_CONTENT_UTILS) $(ENABLE_NAVIGATOR_STANDALONE) $(ENABLE_NOTIFICATIONS) $(ENABLE_PAYMENT_REQUEST) $(ENABLE_PDFKIT_PLUGIN) $(ENABLE_POINTER_EVENTS) $(ENABLE_POINTER_LOCK) $(ENABLE_PUBLIC_SUFFIX_LIST) $(ENABLE_QUOTA) $(ENABLE_REMOTE_INSPECTOR) $(ENABLE_RESOLUTION_MEDIA_QUERY) $(ENABLE_RESOURCE_LOAD_STATISTICS) $(ENABLE_RESOURCE_USAGE) $(ENABLE_RUBBER_BANDING) $(ENABLE_SERVICE_CONTROLS) $(ENABLE_SERVICE_WORKER) $(ENABLE_SPEECH_SYNTHESIS) $(ENABLE_STREAMS_API) $(ENABLE_WEB_CRYPTO) $(ENABLE_SVG_FONTS) $(ENABLE_TELEPHONE_NUMBER_DETECTION) $(ENABLE_TEXT_AUTOSIZING) $(ENABLE_TOUCH_EVENTS) $(ENABLE_USER_MESSAGE_HANDLERS) $(ENABLE_USERSELECT_ALL) $(ENABLE_VARIATION_FONTS) $(ENABLE_VIDEO) $(ENABLE_VIDEO_PRESENTATION_MODE) $(ENABLE_VIDEO_TRACK) $(ENABLE_VIDEO_USES_ELEMENT_FULLSCREEN) $(ENABLE_WEB_API_STATISTICS) $(ENABLE_WEB_AUDIO) $(ENABLE_WEB_AUTHN) $(ENABLE_WEB_RTC) $(ENABLE_WEBASSEMBLY) $(ENABLE_WEBASSEMBLY_STREAMING_API) $(ENABLE_WEBGL) $(ENABLE_WEBGL2) $(ENABLE_WEBGPU) $(ENABLE_WEBMETAL) $(ENABLE_WIRELESS_PLAYBACK_TARGET) $(ENABLE_XSLT);
>Index: Source/WebCore/PAL/ChangeLog
>===================================================================
>--- Source/WebCore/PAL/ChangeLog	(revision 240329)
>+++ Source/WebCore/PAL/ChangeLog	(working copy)
>@@ -1,3 +1,13 @@
>+2019-01-23  Chris Fleizach  <cfleizach@apple.com>
>+
>+        AX: Introduce isolated accessibility tree
>+        https://bugs.webkit.org/show_bug.cgi?id=193348
>+        <rdar://problem/47203295>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Configurations/FeatureDefines.xcconfig:
>+
> 2019-01-22  David Kilzer  <ddkilzer@apple.com>
> 
>         Switch remaining QuickLook soft-linking in WebCore, WebKit over to QuickLookSoftLink.{cpp,h}
>Index: Source/WebCore/PAL/Configurations/FeatureDefines.xcconfig
>===================================================================
>--- Source/WebCore/PAL/Configurations/FeatureDefines.xcconfig	(revision 240206)
>+++ Source/WebCore/PAL/Configurations/FeatureDefines.xcconfig	(working copy)
>@@ -40,6 +40,8 @@
> ENABLE_ACCELERATED_OVERFLOW_SCROLLING = $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING_$(WK_COCOA_TOUCH));
> ENABLE_ACCELERATED_OVERFLOW_SCROLLING_cocoatouch = ENABLE_ACCELERATED_OVERFLOW_SCROLLING;
> 
>+ENABLE_ACCESSIBILITY_ISOLATED_TREE = ;
>+
> ENABLE_APPLE_PAY = $(ENABLE_APPLE_PAY_$(WK_PLATFORM_NAME));
> ENABLE_APPLE_PAY_iphoneos = ENABLE_APPLE_PAY;
> ENABLE_APPLE_PAY_iphonesimulator = ENABLE_APPLE_PAY;
>@@ -406,4 +408,4 @@
> 
> ENABLE_XSLT = ENABLE_XSLT;
> 
>-FEATURE_DEFINES = $(ENABLE_3D_TRANSFORMS) $(ENABLE_ACCELERATED_2D_CANVAS) $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING) $(ENABLE_APPLE_PAY) $(ENABLE_APPLE_PAY_SESSION_V3) $(ENABLE_APPLE_PAY_SESSION_V4) $(ENABLE_APPLICATION_MANIFEST) $(ENABLE_ATTACHMENT_ELEMENT) $(ENABLE_AVF_CAPTIONS) $(ENABLE_C_LOOP) $(ENABLE_CACHE_PARTITIONING) $(ENABLE_CHANNEL_MESSAGING) $(ENABLE_CONTENT_FILTERING) $(ENABLE_CSS3_TEXT) $(ENABLE_CSS_BOX_DECORATION_BREAK) $(ENABLE_CSS_COMPOSITING) $(ENABLE_CSS_DEVICE_ADAPTATION) $(ENABLE_CSS_IMAGE_ORIENTATION) $(ENABLE_CSS_IMAGE_RESOLUTION) $(ENABLE_CSS_PAINTING_API) $(ENABLE_CSS_SCROLL_SNAP) $(ENABLE_CSS_SELECTORS_LEVEL4) $(ENABLE_CSS_TRAILING_WORD) $(ENABLE_CSS_TYPED_OM) $(ENABLE_CURSOR_VISIBILITY) $(ENABLE_CUSTOM_SCHEME_HANDLER) $(ENABLE_CSS_CONIC_GRADIENTS) $(ENABLE_DARK_MODE_CSS) $(ENABLE_DASHBOARD_SUPPORT) $(ENABLE_DATA_INTERACTION) $(ENABLE_DATACUE_VALUE) $(ENABLE_DATALIST_ELEMENT) $(ENABLE_DEVICE_ORIENTATION) $(ENABLE_DRAG_SUPPORT) $(ENABLE_ENCRYPTED_MEDIA) $(ENABLE_EXPERIMENTAL_FEATURES) $(ENABLE_FAST_JIT_PERMISSIONS) $(ENABLE_FILTERS_LEVEL_2) $(ENABLE_FTL_JIT) $(ENABLE_FULLSCREEN_API) $(ENABLE_GAMEPAD) $(ENABLE_GEOLOCATION) $(ENABLE_ICONDATABASE) $(ENABLE_INDEXED_DATABASE) $(ENABLE_INDEXED_DATABASE_IN_WORKERS) $(ENABLE_INPUT_TYPE_COLOR) $(ENABLE_INPUT_TYPE_DATE) $(ENABLE_INPUT_TYPE_DATETIME_INCOMPLETE) $(ENABLE_INPUT_TYPE_DATETIMELOCAL) $(ENABLE_INPUT_TYPE_MONTH) $(ENABLE_INPUT_TYPE_TIME) $(ENABLE_INPUT_TYPE_WEEK) $(ENABLE_INTERSECTION_OBSERVER) $(ENABLE_INTL) $(ENABLE_IOS_GESTURE_EVENTS) $(ENABLE_IOS_TOUCH_EVENTS) $(ENABLE_JIT) $(ENABLE_KEYBOARD_CODE_ATTRIBUTE) $(ENABLE_KEYBOARD_KEY_ATTRIBUTE) $(ENABLE_LAYOUT_FORMATTING_CONTEXT) $(ENABLE_LEGACY_CSS_VENDOR_PREFIXES) $(ENABLE_LEGACY_CUSTOM_PROTOCOL_MANAGER) $(ENABLE_LEGACY_ENCRYPTED_MEDIA) $(ENABLE_LETTERPRESS) $(ENABLE_MAC_GESTURE_EVENTS) $(ENABLE_MAC_VIDEO_TOOLBOX) $(ENABLE_MATHML) $(ENABLE_MEDIA_CAPTURE) $(ENABLE_MEDIA_CONTROLS_SCRIPT) $(ENABLE_MEDIA_SESSION) $(ENABLE_MEDIA_SOURCE) $(ENABLE_MEDIA_STATISTICS) $(ENABLE_MEDIA_STREAM) $(ENABLE_METER_ELEMENT) $(ENABLE_MHTML) $(ENABLE_MOUSE_CURSOR_SCALE) $(ENABLE_NAVIGATOR_CONTENT_UTILS) $(ENABLE_NAVIGATOR_STANDALONE) $(ENABLE_NOTIFICATIONS) $(ENABLE_PAYMENT_REQUEST) $(ENABLE_PDFKIT_PLUGIN) $(ENABLE_POINTER_EVENTS) $(ENABLE_POINTER_LOCK) $(ENABLE_PUBLIC_SUFFIX_LIST) $(ENABLE_QUOTA) $(ENABLE_REMOTE_INSPECTOR) $(ENABLE_RESOLUTION_MEDIA_QUERY) $(ENABLE_RESOURCE_LOAD_STATISTICS) $(ENABLE_RESOURCE_USAGE) $(ENABLE_RUBBER_BANDING) $(ENABLE_SERVICE_CONTROLS) $(ENABLE_SERVICE_WORKER) $(ENABLE_SPEECH_SYNTHESIS) $(ENABLE_STREAMS_API) $(ENABLE_WEB_CRYPTO) $(ENABLE_SVG_FONTS) $(ENABLE_TELEPHONE_NUMBER_DETECTION) $(ENABLE_TEXT_AUTOSIZING) $(ENABLE_TOUCH_EVENTS) $(ENABLE_USER_MESSAGE_HANDLERS) $(ENABLE_USERSELECT_ALL) $(ENABLE_VARIATION_FONTS) $(ENABLE_VIDEO) $(ENABLE_VIDEO_PRESENTATION_MODE) $(ENABLE_VIDEO_TRACK) $(ENABLE_VIDEO_USES_ELEMENT_FULLSCREEN) $(ENABLE_WEB_API_STATISTICS) $(ENABLE_WEB_AUDIO) $(ENABLE_WEB_AUTHN) $(ENABLE_WEB_RTC) $(ENABLE_WEBASSEMBLY) $(ENABLE_WEBASSEMBLY_STREAMING_API) $(ENABLE_WEBGL) $(ENABLE_WEBGL2) $(ENABLE_WEBGPU) $(ENABLE_WEBMETAL) $(ENABLE_WIRELESS_PLAYBACK_TARGET) $(ENABLE_XSLT);
>+FEATURE_DEFINES = $(ENABLE_3D_TRANSFORMS) $(ENABLE_ACCELERATED_2D_CANVAS) $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING) $(ENABLE_ACCESSIBILITY_ISOLATED_TREE) $(ENABLE_APPLE_PAY) $(ENABLE_APPLE_PAY_SESSION_V3) $(ENABLE_APPLE_PAY_SESSION_V4) $(ENABLE_APPLICATION_MANIFEST) $(ENABLE_ATTACHMENT_ELEMENT) $(ENABLE_AVF_CAPTIONS) $(ENABLE_C_LOOP) $(ENABLE_CACHE_PARTITIONING) $(ENABLE_CHANNEL_MESSAGING) $(ENABLE_CONTENT_FILTERING) $(ENABLE_CSS3_TEXT) $(ENABLE_CSS_BOX_DECORATION_BREAK) $(ENABLE_CSS_COMPOSITING) $(ENABLE_CSS_DEVICE_ADAPTATION) $(ENABLE_CSS_IMAGE_ORIENTATION) $(ENABLE_CSS_IMAGE_RESOLUTION) $(ENABLE_CSS_PAINTING_API) $(ENABLE_CSS_SCROLL_SNAP) $(ENABLE_CSS_SELECTORS_LEVEL4) $(ENABLE_CSS_TRAILING_WORD) $(ENABLE_CSS_TYPED_OM) $(ENABLE_CURSOR_VISIBILITY) $(ENABLE_CUSTOM_SCHEME_HANDLER) $(ENABLE_CSS_CONIC_GRADIENTS) $(ENABLE_DARK_MODE_CSS) $(ENABLE_DASHBOARD_SUPPORT) $(ENABLE_DATA_INTERACTION) $(ENABLE_DATACUE_VALUE) $(ENABLE_DATALIST_ELEMENT) $(ENABLE_DEVICE_ORIENTATION) $(ENABLE_DRAG_SUPPORT) $(ENABLE_ENCRYPTED_MEDIA) $(ENABLE_EXPERIMENTAL_FEATURES) $(ENABLE_FAST_JIT_PERMISSIONS) $(ENABLE_FILTERS_LEVEL_2) $(ENABLE_FTL_JIT) $(ENABLE_FULLSCREEN_API) $(ENABLE_GAMEPAD) $(ENABLE_GEOLOCATION) $(ENABLE_ICONDATABASE) $(ENABLE_INDEXED_DATABASE) $(ENABLE_INDEXED_DATABASE_IN_WORKERS) $(ENABLE_INPUT_TYPE_COLOR) $(ENABLE_INPUT_TYPE_DATE) $(ENABLE_INPUT_TYPE_DATETIME_INCOMPLETE) $(ENABLE_INPUT_TYPE_DATETIMELOCAL) $(ENABLE_INPUT_TYPE_MONTH) $(ENABLE_INPUT_TYPE_TIME) $(ENABLE_INPUT_TYPE_WEEK) $(ENABLE_INTERSECTION_OBSERVER) $(ENABLE_INTL) $(ENABLE_IOS_GESTURE_EVENTS) $(ENABLE_IOS_TOUCH_EVENTS) $(ENABLE_JIT) $(ENABLE_KEYBOARD_CODE_ATTRIBUTE) $(ENABLE_KEYBOARD_KEY_ATTRIBUTE) $(ENABLE_LAYOUT_FORMATTING_CONTEXT) $(ENABLE_LEGACY_CSS_VENDOR_PREFIXES) $(ENABLE_LEGACY_CUSTOM_PROTOCOL_MANAGER) $(ENABLE_LEGACY_ENCRYPTED_MEDIA) $(ENABLE_LETTERPRESS) $(ENABLE_MAC_GESTURE_EVENTS) $(ENABLE_MAC_VIDEO_TOOLBOX) $(ENABLE_MATHML) $(ENABLE_MEDIA_CAPTURE) $(ENABLE_MEDIA_CONTROLS_SCRIPT) $(ENABLE_MEDIA_SESSION) $(ENABLE_MEDIA_SOURCE) $(ENABLE_MEDIA_STATISTICS) $(ENABLE_MEDIA_STREAM) $(ENABLE_METER_ELEMENT) $(ENABLE_MHTML) $(ENABLE_MOUSE_CURSOR_SCALE) $(ENABLE_NAVIGATOR_CONTENT_UTILS) $(ENABLE_NAVIGATOR_STANDALONE) $(ENABLE_NOTIFICATIONS) $(ENABLE_PAYMENT_REQUEST) $(ENABLE_PDFKIT_PLUGIN) $(ENABLE_POINTER_EVENTS) $(ENABLE_POINTER_LOCK) $(ENABLE_PUBLIC_SUFFIX_LIST) $(ENABLE_QUOTA) $(ENABLE_REMOTE_INSPECTOR) $(ENABLE_RESOLUTION_MEDIA_QUERY) $(ENABLE_RESOURCE_LOAD_STATISTICS) $(ENABLE_RESOURCE_USAGE) $(ENABLE_RUBBER_BANDING) $(ENABLE_SERVICE_CONTROLS) $(ENABLE_SERVICE_WORKER) $(ENABLE_SPEECH_SYNTHESIS) $(ENABLE_STREAMS_API) $(ENABLE_WEB_CRYPTO) $(ENABLE_SVG_FONTS) $(ENABLE_TELEPHONE_NUMBER_DETECTION) $(ENABLE_TEXT_AUTOSIZING) $(ENABLE_TOUCH_EVENTS) $(ENABLE_USER_MESSAGE_HANDLERS) $(ENABLE_USERSELECT_ALL) $(ENABLE_VARIATION_FONTS) $(ENABLE_VIDEO) $(ENABLE_VIDEO_PRESENTATION_MODE) $(ENABLE_VIDEO_TRACK) $(ENABLE_VIDEO_USES_ELEMENT_FULLSCREEN) $(ENABLE_WEB_API_STATISTICS) $(ENABLE_WEB_AUDIO) $(ENABLE_WEB_AUTHN) $(ENABLE_WEB_RTC) $(ENABLE_WEBASSEMBLY) $(ENABLE_WEBASSEMBLY_STREAMING_API) $(ENABLE_WEBGL) $(ENABLE_WEBGL2) $(ENABLE_WEBGPU) $(ENABLE_WEBMETAL) $(ENABLE_WIRELESS_PLAYBACK_TARGET) $(ENABLE_XSLT);
>Index: Source/WebCore/Sources.txt
>===================================================================
>--- Source/WebCore/Sources.txt	(revision 240246)
>+++ Source/WebCore/Sources.txt	(working copy)
>@@ -405,6 +405,8 @@
> accessibility/AccessibilityTree.cpp
> accessibility/AccessibilityTreeItem.cpp
> accessibility/AccessibleSetValueEvent.cpp
>+accessibility/isolatedtree/AXIsolatedTree.cpp
>+accessibility/isolatedtree/AXIsolatedTreeNode.cpp
> 
> animation/AnimationEffect.cpp
> animation/AnimationPlaybackEvent.cpp
>Index: Source/WebCore/WebCore.xcodeproj/project.pbxproj
>===================================================================
>--- Source/WebCore/WebCore.xcodeproj/project.pbxproj	(revision 240246)
>+++ Source/WebCore/WebCore.xcodeproj/project.pbxproj	(working copy)
>@@ -694,6 +694,7 @@
> 		26F9A83818A046AC00AEB88A /* ViewportConfiguration.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 26F9A83618A046AC00AEB88A /* ViewportConfiguration.cpp */; };
> 		26F9A83918A046AC00AEB88A /* ViewportConfiguration.h in Headers */ = {isa = PBXBuildFile; fileRef = 26F9A83718A046AC00AEB88A /* ViewportConfiguration.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		2914E3081CAB5A440049966F /* AccessibilityAttachment.h in Headers */ = {isa = PBXBuildFile; fileRef = 2914E3061CAB5A440049966F /* AccessibilityAttachment.h */; };
>+		2936BF5C21D69E4B004A8FC9 /* AccessibilityObjectInterface.h in Headers */ = {isa = PBXBuildFile; fileRef = 2936BF5A21D6999E004A8FC9 /* AccessibilityObjectInterface.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		293EAE1F1356B2FE0067ACF9 /* RuntimeApplicationChecks.h in Headers */ = {isa = PBXBuildFile; fileRef = 293EAE1E1356B2FE0067ACF9 /* RuntimeApplicationChecks.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		29489FC712C00F0300D83F0F /* AccessibilityScrollView.h in Headers */ = {isa = PBXBuildFile; fileRef = 29489FC512C00F0300D83F0F /* AccessibilityScrollView.h */; };
> 		297BE3D516C03C08003316BD /* PlatformSpeechSynthesisUtterance.h in Headers */ = {isa = PBXBuildFile; fileRef = 2527CC9116BF8BA1009DDAC0 /* PlatformSpeechSynthesisUtterance.h */; };
>@@ -715,6 +716,8 @@
> 		29A812430FBB9C1D00510293 /* AccessibilityListBox.h in Headers */ = {isa = PBXBuildFile; fileRef = 29A812250FBB9C1D00510293 /* AccessibilityListBox.h */; };
> 		29A812490FBB9CA900510293 /* WebAccessibilityObjectWrapperBase.h in Headers */ = {isa = PBXBuildFile; fileRef = 29A812450FBB9CA900510293 /* WebAccessibilityObjectWrapperBase.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		29ACB212143E7128006BCA5F /* AccessibilityMockObject.h in Headers */ = {isa = PBXBuildFile; fileRef = 29ACB211143E7128006BCA5F /* AccessibilityMockObject.h */; };
>+		29AE212D21AB9EEB00869283 /* AXIsolatedTree.h in Headers */ = {isa = PBXBuildFile; fileRef = 29AE212B21AB9EEB00869283 /* AXIsolatedTree.h */; settings = {ATTRIBUTES = (Private, ); }; };
>+		29AE213521ABA48A00869283 /* AXIsolatedTreeNode.h in Headers */ = {isa = PBXBuildFile; fileRef = 29AE213321ABA48A00869283 /* AXIsolatedTreeNode.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		29D7BCFA1444AF7D0070619C /* AccessibilitySpinButton.h in Headers */ = {isa = PBXBuildFile; fileRef = 29D7BCF91444AF7D0070619C /* AccessibilitySpinButton.h */; };
> 		29FAF4B6195AB08900A522DC /* TextUndoInsertionMarkupMac.h in Headers */ = {isa = PBXBuildFile; fileRef = 29FAF4B5195AB08900A522DC /* TextUndoInsertionMarkupMac.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		2B365C841525119E0091D27B /* RenderSVGEllipse.h in Headers */ = {isa = PBXBuildFile; fileRef = 2B4235A015250F6000DBBCD8 /* RenderSVGEllipse.h */; };
>@@ -6581,6 +6584,7 @@
> 		28DB9BC72020EA0400E54A07 /* PerformanceServerTiming.idl */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = PerformanceServerTiming.idl; sourceTree = "<group>"; };
> 		2914E3051CAB5A440049966F /* AccessibilityAttachment.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = AccessibilityAttachment.cpp; sourceTree = "<group>"; };
> 		2914E3061CAB5A440049966F /* AccessibilityAttachment.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = AccessibilityAttachment.h; sourceTree = "<group>"; };
>+		2936BF5A21D6999E004A8FC9 /* AccessibilityObjectInterface.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = AccessibilityObjectInterface.h; sourceTree = "<group>"; };
> 		293EAE1E1356B2FE0067ACF9 /* RuntimeApplicationChecks.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RuntimeApplicationChecks.h; sourceTree = "<group>"; };
> 		29489FC512C00F0300D83F0F /* AccessibilityScrollView.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = AccessibilityScrollView.h; sourceTree = "<group>"; };
> 		29498681195341940072D2BD /* TextUndoInsertionMarkupMac.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = TextUndoInsertionMarkupMac.mm; sourceTree = "<group>"; };
>@@ -6628,6 +6632,10 @@
> 		29A812470FBB9CA900510293 /* AXObjectCacheMac.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = AXObjectCacheMac.mm; sourceTree = "<group>"; };
> 		29ACB211143E7128006BCA5F /* AccessibilityMockObject.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = AccessibilityMockObject.h; sourceTree = "<group>"; };
> 		29ACB213143E7498006BCA5F /* AccessibilityMockObject.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = AccessibilityMockObject.cpp; sourceTree = "<group>"; };
>+		29AE212B21AB9EEB00869283 /* AXIsolatedTree.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = AXIsolatedTree.h; sourceTree = "<group>"; };
>+		29AE212C21AB9EEB00869283 /* AXIsolatedTree.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = AXIsolatedTree.cpp; sourceTree = "<group>"; };
>+		29AE213321ABA48A00869283 /* AXIsolatedTreeNode.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = AXIsolatedTreeNode.h; sourceTree = "<group>"; };
>+		29AE213421ABA48A00869283 /* AXIsolatedTreeNode.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = AXIsolatedTreeNode.cpp; sourceTree = "<group>"; };
> 		29D7BCF51444AF580070619C /* AccessibilitySpinButton.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = AccessibilitySpinButton.cpp; sourceTree = "<group>"; };
> 		29D7BCF91444AF7D0070619C /* AccessibilitySpinButton.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = AccessibilitySpinButton.h; sourceTree = "<group>"; };
> 		29E04A27BED2F81F98E9022B /* JSBeforeUnloadEvent.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = JSBeforeUnloadEvent.h; sourceTree = "<group>"; };
>@@ -17253,6 +17261,7 @@
> 		29A812040FBB9B4100510293 /* accessibility */ = {
> 			isa = PBXGroup;
> 			children = (
>+				29AE212921AB9ECB00869283 /* isolatedtree */,
> 				AAA728EF16D1D8BC00D3BBC6 /* ios */,
> 				29A812050FBB9B5200510293 /* mac */,
> 				2981CA9D131822EC00D12F2A /* AccessibilityARIAGrid.cpp */,
>@@ -17291,6 +17300,7 @@
> 				2985709315CC532D006355CD /* AccessibilityNodeObject.h */,
> 				2981CAA5131822EC00D12F2A /* AccessibilityObject.cpp */,
> 				29A812180FBB9C1D00510293 /* AccessibilityObject.h */,
>+				2936BF5A21D6999E004A8FC9 /* AccessibilityObjectInterface.h */,
> 				A409C982116D0DDD007197BD /* AccessibilityProgressIndicator.cpp */,
> 				A409C983116D0DDD007197BD /* AccessibilityProgressIndicator.h */,
> 				2981CAA6131822EC00D12F2A /* AccessibilityRenderObject.cpp */,
>@@ -17346,6 +17356,17 @@
> 			path = mac;
> 			sourceTree = "<group>";
> 		};
>+		29AE212921AB9ECB00869283 /* isolatedtree */ = {
>+			isa = PBXGroup;
>+			children = (
>+				29AE212B21AB9EEB00869283 /* AXIsolatedTree.h */,
>+				29AE212C21AB9EEB00869283 /* AXIsolatedTree.cpp */,
>+				29AE213321ABA48A00869283 /* AXIsolatedTreeNode.h */,
>+				29AE213421ABA48A00869283 /* AXIsolatedTreeNode.cpp */,
>+			);
>+			path = isolatedtree;
>+			sourceTree = "<group>";
>+		};
> 		2D0621461DA639EC00A7FB26 /* legacy */ = {
> 			isa = PBXGroup;
> 			children = (
>@@ -29984,6 +30005,7 @@
> 				1AE2AA980A1CDD2D00B42B25 /* JSHTMLImageElement.h in Headers */,
> 				A80E7E970A1A83E3007FB8C5 /* JSHTMLInputElement.h in Headers */,
> 				836B09561F5F34D9003C3702 /* JSHTMLInputElementEntriesAPI.h in Headers */,
>+				2936BF5C21D69E4B004A8FC9 /* AccessibilityObjectInterface.h in Headers */,
> 				A6148A7912E41E3B0044A784 /* JSHTMLKeygenElement.h in Headers */,
> 				1AE2AB220A1CE63B00B42B25 /* JSHTMLLabelElement.h in Headers */,
> 				1AE2AB240A1CE63B00B42B25 /* JSHTMLLegendElement.h in Headers */,
>@@ -31438,6 +31460,7 @@
> 				51405C89190B014400754F94 /* SelectionRectGatherer.h in Headers */,
> 				E44B4BB4141650D7002B1D8B /* SelectorChecker.h in Headers */,
> 				432D3FE818A8658400D7DC03 /* SelectorCheckerTestFunctions.h in Headers */,
>+				29AE213521ABA48A00869283 /* AXIsolatedTreeNode.h in Headers */,
> 				26B999971804D54200D01121 /* SelectorCompiler.h in Headers */,
> 				415071581685067300C3C7B3 /* SelectorFilter.h in Headers */,
> 				43107BE218CC19DE00CC18E8 /* SelectorPseudoTypeMap.h in Headers */,
>@@ -32373,6 +32396,7 @@
> 				977E2E0F12F0FC9C00C13380 /* XSSAuditorDelegate.h in Headers */,
> 				A5416FE618810EF80009FC5F /* YouTubeEmbedShadowElement.h in Headers */,
> 				7A5515F5191830A3009687D2 /* YouTubePluginReplacement.h in Headers */,
>+				29AE212D21AB9EEB00869283 /* AXIsolatedTree.h in Headers */,
> 				FD537353137B651800008DCE /* ZeroPole.h in Headers */,
> 			);
> 			runOnlyForDeploymentPostprocessing = 0;
>Index: Source/WebCore/accessibility/AXObjectCache.cpp
>===================================================================
>--- Source/WebCore/accessibility/AXObjectCache.cpp	(revision 240246)
>+++ Source/WebCore/accessibility/AXObjectCache.cpp	(working copy)
>@@ -32,6 +32,8 @@
> 
> #include "AXObjectCache.h"
> 
>+#include "AXIsolatedTree.h"
>+#include "AXIsolatedTreeNode.h"
> #include "AccessibilityARIAGrid.h"
> #include "AccessibilityARIAGridCell.h"
> #include "AccessibilityARIAGridRow.h"
>@@ -115,6 +117,8 @@
> 
> using namespace HTMLNames;
> 
>+const AXID InvalidAXID = 0;
>+
> // Post value change notifications for password fields or elements contained in password fields at a 40hz interval to thwart analysis of typing cadence
> static const Seconds accessibilityPasswordValueChangeNotificationInterval { 25_ms };
> static const Seconds accessibilityLiveRegionChangedNotificationInterval { 20_ms };
>@@ -723,7 +727,11 @@
>     object->setAXObjectID(0);
> 
>     m_idsInUse.remove(axID);
>-
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+    if (auto pageID = m_document.pageID())
>+        AXIsolatedTree::treeForPageID(*pageID)->removeNode(axID);
>+#endif
>+    
>     ASSERT(m_objects.size() >= m_idsInUse.size());
> }
>     
>@@ -2907,6 +2915,36 @@
>     m_deferredFocusedNodeChange.clear();
> }
>     
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+Ref<AXIsolatedTreeNode> AXObjectCache::createIsolatedAccessibilityTree(AccessibilityObject& object, AXID parentID, AXIsolatedTree& tree, Vector<RefPtr<AXIsolatedTreeNode>>& nodes)
>+{
>+    auto isolatedTreeNode = AXIsolatedTreeNode::create(object);
>+    nodes.append(isolatedTreeNode.ptr());
>+    
>+    auto relationship = isolatedTreeNode->relationship();
>+    relationship->setParent(parentID);
>+    associateIsolatedTreeNode(object, isolatedTreeNode, tree.treeIdentifier());
>+    
>+    for (auto child : object.children()) {
>+        auto staticChild = createIsolatedAccessibilityTree(*child, isolatedTreeNode->identifier(), tree, nodes);
>+        relationship->children().append(staticChild->identifier());
>+    }
>+    
>+    return isolatedTreeNode;
>+}
>+    
>+Ref<AXIsolatedTree> AXObjectCache::generateStaticAccessibilityTreeIfNeeded()
>+{
>+    auto tree = AXIsolatedTree::treeForPageID(*m_document.pageID());
>+    Vector<RefPtr<AXIsolatedTreeNode>> nodes;
>+    auto root = createIsolatedAccessibilityTree(*rootObject(), InvalidAXID, tree, nodes);
>+    root->setIsRootNode(true);
>+    tree->appendNodeChanges(nodes);
>+    
>+    return tree;
>+}
>+#endif
>+    
> void AXObjectCache::deferRecomputeIsIgnoredIfNeeded(Element* element)
> {
>     if (!nodeAndRendererAreValid(element))
>Index: Source/WebCore/accessibility/AXObjectCache.h
>===================================================================
>--- Source/WebCore/accessibility/AXObjectCache.h	(revision 240246)
>+++ Source/WebCore/accessibility/AXObjectCache.h	(working copy)
>@@ -25,6 +25,9 @@
> 
> #pragma once
> 
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+#include "AXIsolatedTree.h"
>+#endif
> #include "AXTextStateChangeIntent.h"
> #include "AccessibilityObject.h"
> #include "Range.h"
>@@ -39,6 +42,9 @@
> 
> namespace WebCore {
> 
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+class AXIsolatedTreeNode;
>+#endif
> class Document;
> class HTMLAreaElement;
> class HTMLTextFormControlElement;
>@@ -180,6 +186,13 @@
>     void deferAttributeChangeIfNeeded(const QualifiedName&, Element*);
>     void recomputeIsIgnored(RenderObject* renderer);
> 
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+    WEBCORE_EXPORT Ref<AXIsolatedTree> generateStaticAccessibilityTreeIfNeeded();
>+
>+    void associateIsolatedTreeNode(AccessibilityObject&, AXIsolatedTreeNode&, AXIsolatedTreeID);
>+    Ref<AXIsolatedTreeNode> createIsolatedAccessibilityTree(AccessibilityObject&, AXID, AXIsolatedTree&, Vector<RefPtr<AXIsolatedTreeNode>>&);
>+#endif
>+    
> #if HAVE(ACCESSIBILITY)
>     WEBCORE_EXPORT static void enableAccessibility();
>     WEBCORE_EXPORT static void disableAccessibility();
>Index: Source/WebCore/accessibility/AccessibilityObject.h
>===================================================================
>--- Source/WebCore/accessibility/AccessibilityObject.h	(revision 240246)
>+++ Source/WebCore/accessibility/AccessibilityObject.h	(working copy)
>@@ -29,6 +29,7 @@
> 
> #pragma once
> 
>+#include "AccessibilityObjectInterface.h"
> #include "FloatQuad.h"
> #include "HTMLTextFormControlElement.h"
> #include "LayoutRect.h"
>@@ -89,157 +90,6 @@
> class ScrollView;
> class Widget;
> 
>-typedef unsigned AXID;
>-
>-enum class AccessibilityRole {
>-    Annotation = 1,
>-    Application,
>-    ApplicationAlert,
>-    ApplicationAlertDialog,
>-    ApplicationDialog,
>-    ApplicationGroup,
>-    ApplicationLog,
>-    ApplicationMarquee,
>-    ApplicationStatus,
>-    ApplicationTextGroup,
>-    ApplicationTimer,
>-    Audio,
>-    Blockquote,
>-    Browser,
>-    BusyIndicator,
>-    Button,
>-    Canvas,
>-    Caption,
>-    Cell,
>-    CheckBox,
>-    ColorWell,
>-    Column,
>-    ColumnHeader,
>-    ComboBox,
>-    Definition,
>-    DescriptionList,
>-    DescriptionListTerm,
>-    DescriptionListDetail,
>-    Details,
>-    Directory,
>-    DisclosureTriangle,
>-    Div,
>-    Document,
>-    DocumentArticle,
>-    DocumentMath,
>-    DocumentNote,
>-    Drawer,
>-    EditableText,
>-    Feed,
>-    Figure,
>-    Footer,
>-    Footnote,
>-    Form,
>-    GraphicsDocument,
>-    GraphicsObject,
>-    GraphicsSymbol,
>-    Grid,
>-    GridCell,
>-    Group,
>-    GrowArea,
>-    Heading,
>-    HelpTag,
>-    HorizontalRule,
>-    Ignored,
>-    Inline,
>-    Image,
>-    ImageMap,
>-    ImageMapLink,
>-    Incrementor,
>-    Label,
>-    LandmarkBanner,
>-    LandmarkComplementary,
>-    LandmarkContentInfo,
>-    LandmarkDocRegion,
>-    LandmarkMain,
>-    LandmarkNavigation,
>-    LandmarkRegion,
>-    LandmarkSearch,
>-    Legend,
>-    Link,
>-    List,
>-    ListBox,
>-    ListBoxOption,
>-    ListItem,
>-    ListMarker,
>-    Mark,
>-    MathElement,
>-    Matte,
>-    Menu,
>-    MenuBar,
>-    MenuButton,
>-    MenuItem,
>-    MenuItemCheckbox,
>-    MenuItemRadio,
>-    MenuListPopup,
>-    MenuListOption,
>-    Outline,
>-    Paragraph,
>-    PopUpButton,
>-    Pre,
>-    Presentational,
>-    ProgressIndicator,
>-    RadioButton,
>-    RadioGroup,
>-    RowHeader,
>-    Row,
>-    RowGroup,
>-    RubyBase,
>-    RubyBlock,
>-    RubyInline,
>-    RubyRun,
>-    RubyText,
>-    Ruler,
>-    RulerMarker,
>-    ScrollArea,
>-    ScrollBar,
>-    SearchField,
>-    Sheet,
>-    Slider,
>-    SliderThumb,
>-    SpinButton,
>-    SpinButtonPart,
>-    SplitGroup,
>-    Splitter,
>-    StaticText,
>-    Summary,
>-    Switch,
>-    SystemWide,
>-    SVGRoot,
>-    SVGText,
>-    SVGTSpan,
>-    SVGTextPath,
>-    TabGroup,
>-    TabList,
>-    TabPanel,
>-    Tab,
>-    Table,
>-    TableHeaderContainer,
>-    TextArea,
>-    TextGroup,
>-    Term,
>-    Time,
>-    Tree,
>-    TreeGrid,
>-    TreeItem,
>-    TextField,
>-    ToggleButton,
>-    Toolbar,
>-    Unknown,
>-    UserInterfaceTooltip,
>-    ValueIndicator,
>-    Video,
>-    WebApplication,
>-    WebArea,
>-    WebCoreLink,
>-    Window,
>-};
>-
> enum class AccessibilityTextSource {
>     Alternative,
>     Children,
>@@ -491,7 +341,7 @@
>     
> bool nodeHasPresentationRole(Node*);
>     
>-class AccessibilityObject : public RefCounted<AccessibilityObject> {
>+class AccessibilityObject : public RefCounted<AccessibilityObject>, public AccessibilityObjectInterface {
> protected:
>     AccessibilityObject() = default;
>     
>@@ -1159,7 +1009,10 @@
>     AccessibilityIsIgnoredFromParentData m_isIgnoredFromParentData { };
>     bool m_childrenDirty { false };
>     bool m_subtreeDirty { false };
>-
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+    bool m_isolatedTreeNodeInitialized { false };
>+#endif
>+    
>     void setIsIgnoredFromParentData(AccessibilityIsIgnoredFromParentData& data) { m_isIgnoredFromParentData = data; }
> 
>     virtual bool computeAccessibilityIsIgnored() const { return true; }
>Index: Source/WebCore/accessibility/AccessibilityObjectInterface.h
>===================================================================
>--- Source/WebCore/accessibility/AccessibilityObjectInterface.h	(nonexistent)
>+++ Source/WebCore/accessibility/AccessibilityObjectInterface.h	(working copy)
>@@ -0,0 +1,191 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+namespace WebCore {
>+
>+typedef unsigned AXID;
>+extern const AXID InvalidAXID;
>+
>+enum class AccessibilityRole {
>+    Annotation = 1,
>+    Application,
>+    ApplicationAlert,
>+    ApplicationAlertDialog,
>+    ApplicationDialog,
>+    ApplicationGroup,
>+    ApplicationLog,
>+    ApplicationMarquee,
>+    ApplicationStatus,
>+    ApplicationTextGroup,
>+    ApplicationTimer,
>+    Audio,
>+    Blockquote,
>+    Browser,
>+    BusyIndicator,
>+    Button,
>+    Canvas,
>+    Caption,
>+    Cell,
>+    CheckBox,
>+    ColorWell,
>+    Column,
>+    ColumnHeader,
>+    ComboBox,
>+    Definition,
>+    DescriptionList,
>+    DescriptionListTerm,
>+    DescriptionListDetail,
>+    Details,
>+    Directory,
>+    DisclosureTriangle,
>+    Div,
>+    Document,
>+    DocumentArticle,
>+    DocumentMath,
>+    DocumentNote,
>+    Drawer,
>+    EditableText,
>+    Feed,
>+    Figure,
>+    Footer,
>+    Footnote,
>+    Form,
>+    GraphicsDocument,
>+    GraphicsObject,
>+    GraphicsSymbol,
>+    Grid,
>+    GridCell,
>+    Group,
>+    GrowArea,
>+    Heading,
>+    HelpTag,
>+    HorizontalRule,
>+    Ignored,
>+    Inline,
>+    Image,
>+    ImageMap,
>+    ImageMapLink,
>+    Incrementor,
>+    Label,
>+    LandmarkBanner,
>+    LandmarkComplementary,
>+    LandmarkContentInfo,
>+    LandmarkDocRegion,
>+    LandmarkMain,
>+    LandmarkNavigation,
>+    LandmarkRegion,
>+    LandmarkSearch,
>+    Legend,
>+    Link,
>+    List,
>+    ListBox,
>+    ListBoxOption,
>+    ListItem,
>+    ListMarker,
>+    Mark,
>+    MathElement,
>+    Matte,
>+    Menu,
>+    MenuBar,
>+    MenuButton,
>+    MenuItem,
>+    MenuItemCheckbox,
>+    MenuItemRadio,
>+    MenuListPopup,
>+    MenuListOption,
>+    Outline,
>+    Paragraph,
>+    PopUpButton,
>+    Pre,
>+    Presentational,
>+    ProgressIndicator,
>+    RadioButton,
>+    RadioGroup,
>+    RowHeader,
>+    Row,
>+    RowGroup,
>+    RubyBase,
>+    RubyBlock,
>+    RubyInline,
>+    RubyRun,
>+    RubyText,
>+    Ruler,
>+    RulerMarker,
>+    ScrollArea,
>+    ScrollBar,
>+    SearchField,
>+    Sheet,
>+    Slider,
>+    SliderThumb,
>+    SpinButton,
>+    SpinButtonPart,
>+    SplitGroup,
>+    Splitter,
>+    StaticText,
>+    Summary,
>+    Switch,
>+    SystemWide,
>+    SVGRoot,
>+    SVGText,
>+    SVGTSpan,
>+    SVGTextPath,
>+    TabGroup,
>+    TabList,
>+    TabPanel,
>+    Tab,
>+    Table,
>+    TableHeaderContainer,
>+    TextArea,
>+    TextGroup,
>+    Term,
>+    Time,
>+    Tree,
>+    TreeGrid,
>+    TreeItem,
>+    TextField,
>+    ToggleButton,
>+    Toolbar,
>+    Unknown,
>+    UserInterfaceTooltip,
>+    ValueIndicator,
>+    Video,
>+    WebApplication,
>+    WebArea,
>+    WebCoreLink,
>+    Window,
>+};
>+
>+class AccessibilityObjectInterface {
>+public:
>+    virtual ~AccessibilityObjectInterface() = default;
>+
>+    virtual bool isMediaControlLabel() const = 0;
>+    virtual AccessibilityRole roleValue() const = 0;
>+    virtual bool isAttachment() const = 0;
>+};
>+
>+}
>Index: Source/WebCore/accessibility/isolatedtree/AXIsolatedTree.cpp
>===================================================================
>--- Source/WebCore/accessibility/isolatedtree/AXIsolatedTree.cpp	(nonexistent)
>+++ Source/WebCore/accessibility/isolatedtree/AXIsolatedTree.cpp	(working copy)
>@@ -0,0 +1,126 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+
>+#include "config.h"
>+#include "AXIsolatedTree.h"
>+
>+#include "AXIsolatedTreeNode.h"
>+#include "Page.h"
>+#include <wtf/NeverDestroyed.h>
>+
>+namespace WebCore {
>+    
>+static unsigned s_treeIDCount = 0;
>+
>+HashMap<AXIsolatedTreeID, Ref<AXIsolatedTree>>& AXIsolatedTree::treeCache()
>+{
>+    static NeverDestroyed<HashMap<AXIsolatedTreeID, Ref<AXIsolatedTree>>> map;
>+    return map;
>+}
>+
>+AXIsolatedTree::AXIsolatedTree()
>+    : m_treeID(++s_treeIDCount)
>+{
>+}
>+
>+AXIsolatedTree::~AXIsolatedTree() = default;
>+
>+Ref<AXIsolatedTree> AXIsolatedTree::create()
>+{
>+    return adoptRef(*new AXIsolatedTree());
>+}
>+    
>+RefPtr<AXIsolatedTree> AXIsolatedTree::treeForID(AXIsolatedTreeID treeID)
>+{
>+    return treeCache().get(treeID);
>+}
>+
>+Ref<AXIsolatedTree> AXIsolatedTree::treeForPageID(uint64_t pageID)
>+{
>+    static Lock cacheLock;
>+    static NeverDestroyed<HashMap<uint64_t, Ref<AXIsolatedTree>>> pageMap;
>+
>+    cacheLock.lock();
>+    if (AXIsolatedTree* tree = pageMap.get().get(pageID)) {
>+        Ref<AXIsolatedTree> newTree = makeRef(*tree);
>+        cacheLock.unlock();
>+        return newTree;
>+    } else {
>+        Ref<AXIsolatedTree> newTree = AXIsolatedTree::create();
>+        pageMap.get().set(pageID, newTree.copyRef());
>+        treeCache().set(newTree->treeIdentifier(), newTree.copyRef());
>+        cacheLock.unlock();
>+        return newTree;
>+    }
>+}
>+    
>+RefPtr<AXIsolatedTreeNode> AXIsolatedTree::nodeForID(AXID axID) const
>+{
>+    if (!axID)
>+        return nullptr;
>+    return m_readerThreadNodeMap.get(axID);
>+}
>+
>+RefPtr<AXIsolatedTreeNode> AXIsolatedTree::rootNode()
>+{
>+    return nodeForID(m_rootNodeID);
>+}
>+
>+void AXIsolatedTree::removeNode(AXID axID)
>+{
>+    m_changeLogLock.lock();
>+    m_pendingRemovals.append(axID);
>+    m_changeLogLock.unlock();
>+}
>+
>+void AXIsolatedTree::appendNodeChanges(Vector<RefPtr<AXIsolatedTreeNode>>& log)
>+{
>+    m_changeLogLock.lock();
>+    m_pendingAppends.appendVector(log);
>+    m_changeLogLock.unlock();
>+}
>+    
>+void AXIsolatedTree::applyPendingChanges()
>+{
>+    m_changeLogLock.lock();
>+    Vector<RefPtr<AXIsolatedTreeNode>> appendCopy(WTFMove(m_pendingAppends));
>+    Vector<AXID> removeCopy(WTFMove(m_pendingRemovals));
>+    m_changeLogLock.unlock();
>+
>+    for (auto& item : appendCopy) {
>+        m_readerThreadNodeMap.set(item->identifier(), *item);
>+        if (item->isRootNode())
>+            m_rootNodeID = item->identifier();
>+    }
>+
>+    for (auto item : removeCopy)
>+        m_readerThreadNodeMap.remove(item);
>+}
>+    
>+} // namespace WebCore
>+
>+#endif // ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>Index: Source/WebCore/accessibility/isolatedtree/AXIsolatedTree.h
>===================================================================
>--- Source/WebCore/accessibility/isolatedtree/AXIsolatedTree.h	(nonexistent)
>+++ Source/WebCore/accessibility/isolatedtree/AXIsolatedTree.h	(working copy)
>@@ -0,0 +1,82 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+
>+#include "AXIsolatedTreeNode.h"
>+#include <wtf/HashMap.h>
>+#include <wtf/RefPtr.h>
>+#include <wtf/ThreadSafeRefCounted.h>
>+
>+namespace WebCore {
>+
>+class Page;
>+
>+typedef unsigned AXIsolatedTreeID;
>+    
>+class AXIsolatedTree : public ThreadSafeRefCounted<AXIsolatedTree> {
>+    WTF_MAKE_NONCOPYABLE(AXIsolatedTree); WTF_MAKE_FAST_ALLOCATED;
>+
>+public:
>+    static Ref<AXIsolatedTree> create();
>+    virtual ~AXIsolatedTree();
>+
>+    WEBCORE_EXPORT static Ref<AXIsolatedTree> treeForPageID(uint64_t);
>+    WEBCORE_EXPORT static RefPtr<AXIsolatedTree> treeForID(AXIsolatedTreeID);
>+
>+    WEBCORE_EXPORT RefPtr<AXIsolatedTreeNode> rootNode();
>+    RefPtr<AXIsolatedTreeNode> nodeForID(AXID) const;
>+
>+    // Call on main thread
>+    void appendNodeChanges(Vector<RefPtr<AXIsolatedTreeNode>>&);
>+    void removeNode(AXID);
>+
>+    // Call on AX thread
>+    WEBCORE_EXPORT void applyPendingChanges();
>+    
>+    AXIsolatedTreeID treeIdentifier() const { return m_treeID; }
>+    
>+private:
>+    AXIsolatedTree();
>+
>+    static HashMap<AXIsolatedTreeID, Ref<AXIsolatedTree>>& treeCache();
>+    
>+    // Only access on AX thread requesting data.
>+    HashMap<AXID, Ref<AXIsolatedTreeNode>> m_readerThreadNodeMap;
>+    
>+    // Written to by main thread under lock, accessed and applied by AX thread.
>+    Vector<RefPtr<AXIsolatedTreeNode>> m_pendingAppends;
>+    Vector<AXID> m_pendingRemovals;
>+    Lock m_changeLogLock;
>+
>+    AXIsolatedTreeID m_treeID;
>+    AXID m_rootNodeID;
>+};
>+
>+} // namespace WebCore
>+
>+#endif
>Index: Source/WebCore/accessibility/isolatedtree/AXIsolatedTreeNode.cpp
>===================================================================
>--- Source/WebCore/accessibility/isolatedtree/AXIsolatedTreeNode.cpp	(nonexistent)
>+++ Source/WebCore/accessibility/isolatedtree/AXIsolatedTreeNode.cpp	(working copy)
>@@ -0,0 +1,118 @@
>+/*
>+ * Copyright (C) 2019 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+
>+#include "config.h"
>+#include "AXIsolatedTreeNode.h"
>+
>+#include "AccessibilityObject.h"
>+
>+namespace WebCore {
>+
>+AXIsolatedTreeNode::AXIsolatedTreeNode(const AccessibilityObject& object)
>+    : m_identifier(object.axObjectID())
>+    , m_relationship(AXIsolatedTreeRelationship::create())
>+{
>+    initializeAttributeData(object);
>+}
>+
>+Ref<AXIsolatedTreeNode> AXIsolatedTreeNode::create(const AccessibilityObject& object)
>+{
>+    return adoptRef(*new AXIsolatedTreeNode(object));
>+}
>+    
>+AXIsolatedTreeNode::~AXIsolatedTreeNode() = default;
>+
>+void AXIsolatedTreeNode::initializeAttributeData(const AccessibilityObject& object)
>+{
>+    setProperty(AXPropertyName::RoleValue, static_cast<int>(object.roleValue()));
>+    setProperty(AXPropertyName::IsAttachment, object.isAttachment());
>+    setProperty(AXPropertyName::IsMediaControlLabel, object.isMediaControlLabel());
>+}
>+    
>+void AXIsolatedTreeNode::setProperty(AXPropertyName propertyName, AttributeValueVariant&& value, bool shouldRemove)
>+{
>+    if (shouldRemove)
>+        m_attributeMap.remove(propertyName);
>+    else
>+        m_attributeMap.set(propertyName, value);
>+}
>+    
>+double AXIsolatedTreeNode::doubleAttributeValue(AXPropertyName propertyName) const
>+{
>+    auto value = m_attributeMap.get(propertyName);
>+    return WTF::switchOn(value, [&] (double& typedValue) {
>+        return typedValue;
>+    }, [&] (auto&) {
>+        return 0.0;
>+    });
>+}
>+
>+unsigned AXIsolatedTreeNode::unsignedAttributeValue(AXPropertyName propertyName) const
>+{
>+    auto value = m_attributeMap.get(propertyName);
>+    return WTF::switchOn(value, [&] (unsigned& typedValue) {
>+        return typedValue;
>+    }, [&] (auto&) {
>+        return 0;
>+    });
>+}
>+
>+bool AXIsolatedTreeNode::boolAttributeValue(AXPropertyName propertyName) const
>+{
>+    auto value = m_attributeMap.get(propertyName);
>+    return WTF::switchOn(value, [&] (bool& typedValue) {
>+        return typedValue;
>+    }, [&] (auto&) {
>+        return false;
>+    });
>+}
>+
>+const String& AXIsolatedTreeNode::stringAttributeValue(AXPropertyName propertyName) const
>+{
>+    auto value = m_attributeMap.get(propertyName);
>+    return WTF::switchOn(value, [&] (String& typedValue) {
>+        return typedValue;
>+    }, [&] (auto&) {
>+        return nullAtom();
>+    });
>+}
>+
>+int AXIsolatedTreeNode::intAttributeValue(AXPropertyName propertyName) const
>+{
>+    auto value = m_attributeMap.get(propertyName);
>+    return WTF::switchOn(value, [&] (int& typedValue) {
>+        return typedValue;
>+    }, [&] (auto&) {
>+        return 0;
>+    });
>+}
>+
>+#pragma mark - Overrides
>+    
>+} // namespace WebCore
>+
>+#endif // ENABLE((ACCESSIBILITY_ISOLATED_TREE)
>Index: Source/WebCore/accessibility/isolatedtree/AXIsolatedTreeNode.h
>===================================================================
>--- Source/WebCore/accessibility/isolatedtree/AXIsolatedTreeNode.h	(nonexistent)
>+++ Source/WebCore/accessibility/isolatedtree/AXIsolatedTreeNode.h	(working copy)
>@@ -0,0 +1,155 @@
>+/*
>+* Copyright (C) 2019 Apple Inc. All rights reserved.
>+*
>+* Redistribution and use in source and binary forms, with or without
>+* modification, are permitted provided that the following conditions
>+* are met:
>+* 1. Redistributions of source code must retain the above copyright
>+*    notice, this list of conditions and the following disclaimer.
>+* 2. Redistributions in binary form must reproduce the above copyright
>+*    notice, this list of conditions and the following disclaimer in the
>+*    documentation and/or other materials provided with the distribution.
>+*
>+* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+* THE POSSIBILITY OF SUCH DAMAGE.
>+*/
>+
>+#pragma once
>+
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+
>+#include "AccessibilityObjectInterface.h"
>+#include <wtf/Forward.h>
>+#include <wtf/HashMap.h>
>+#include <wtf/RefPtr.h>
>+#include <wtf/RetainPtr.h>
>+#include <wtf/ThreadSafeRefCounted.h>
>+#include <wtf/Variant.h>
>+#include <wtf/Vector.h>
>+#include <wtf/WeakPtr.h>
>+
>+#if PLATFORM(COCOA)
>+OBJC_CLASS WebAccessibilityObjectWrapper;
>+#endif
>+
>+namespace WebCore {
>+
>+class AccessibilityObject;
>+
>+class AXIsolatedTreeRelationship : public ThreadSafeRefCounted<AXIsolatedTreeRelationship> {
>+public:
>+    static Ref<AXIsolatedTreeRelationship> create() { return adoptRef(*new AXIsolatedTreeRelationship()); }
>+    virtual ~AXIsolatedTreeRelationship() = default;
>+
>+    AXIsolatedTreeRelationship(const AXIsolatedTreeRelationship& relationship)
>+        : m_parent(relationship.m_parent)
>+        , m_children(relationship.m_children)
>+    {
>+    }
>+    
>+    AXIsolatedTreeRelationship& operator=(const AXIsolatedTreeRelationship& relationship)
>+    {
>+        m_parent = relationship.m_parent;
>+        m_children = relationship.m_children;
>+        return *this;
>+    }
>+
>+    void setParent(AXID parent) { m_parent = parent; }
>+    AXID parent() const { return m_parent; }
>+
>+    Vector<AXID>& children() { return m_children; };
>+
>+private:
>+    AXIsolatedTreeRelationship() { }
>+
>+    AXID m_parent;
>+    Vector<AXID> m_children;
>+};
>+
>+    
>+class AXIsolatedTreeNode final : public AccessibilityObjectInterface, public ThreadSafeRefCounted<AXIsolatedTreeNode>, public CanMakeWeakPtr<AXIsolatedTreeNode> {
>+    
>+enum class AXPropertyName : uint16_t {
>+    None = 0,
>+    RoleValue = 1,
>+    IsAttachment,
>+    IsMediaControlLabel,
>+};
>+
>+struct AXPropertyHashTraits : WTF::StrongEnumHashTraits<AXPropertyName> {
>+    static const bool emptyValueIsZero = false;
>+    static AXPropertyName emptyValue() { return AXPropertyName::None; };
>+    static void constructDeletedValue(AXPropertyName& slot)
>+    {
>+        slot = static_cast<AXPropertyName>(static_cast<int>(AXPropertyName::None) - 1);
>+    }
>+    static bool isDeletedValue(AXPropertyName value)
>+    {
>+        return static_cast<int>(value) == static_cast<int>(AXPropertyName::None) - 1;
>+    }
>+};
>+
>+protected:
>+    AXIsolatedTreeNode() = default;
>+
>+public:
>+    static Ref<AXIsolatedTreeNode> create(const AccessibilityObject&);
>+    virtual ~AXIsolatedTreeNode();
>+
>+    AXID identifier() const { return m_identifier; }
>+    
>+    Ref<AXIsolatedTreeRelationship> relationship() { return m_relationship.copyRef(); }
>+    
>+    bool isRootNode() const { return m_isRootNode; }
>+    void setIsRootNode(bool value) { m_isRootNode = value; }
>+    
>+#if PLATFORM(COCOA)
>+    WebAccessibilityObjectWrapper* wrapper() const { return m_wrapper.get(); }
>+    void setWrapper(WebAccessibilityObjectWrapper* wrapper)
>+    {
>+        m_wrapper = wrapper;
>+    }
>+#endif
>+
>+private:
>+    AXIsolatedTreeNode(const AccessibilityObject&);
>+    void initializeAttributeData(const AccessibilityObject&);
>+
>+    bool isMediaControlLabel() const override { return boolAttributeValue(AXPropertyName::IsMediaControlLabel); }
>+    bool isAttachment() const override { return boolAttributeValue(AXPropertyName::IsAttachment); }
>+    AccessibilityRole roleValue() const override { return static_cast<AccessibilityRole>(intAttributeValue(AXPropertyName::RoleValue)); }
>+
>+    using AttributeValueVariant = Variant<std::nullptr_t, String, bool, int, unsigned, double>;
>+    void setProperty(AXPropertyName, AttributeValueVariant&&, bool shouldRemove = false);
>+
>+    bool boolAttributeValue(AXPropertyName) const;
>+    const String& stringAttributeValue(AXPropertyName) const;
>+    int intAttributeValue(AXPropertyName) const;
>+    unsigned unsignedAttributeValue(AXPropertyName) const;
>+    double doubleAttributeValue(AXPropertyName) const;
>+
>+    AXID m_identifier;
>+    bool m_isRootNode;
>+    Ref<AXIsolatedTreeRelationship> m_relationship;
>+
>+#if PLATFORM(COCOA)
>+    RetainPtr<WebAccessibilityObjectWrapper> m_wrapper;
>+#endif
>+
>+    // We don't mark this const because even though attributes don't change after initial creation,
>+    // we may copy an existing node and replace specific values,
>+    HashMap<AXPropertyName, AttributeValueVariant, WTF::IntHash<AXPropertyName>, AXPropertyHashTraits> m_attributeMap;
>+};
>+
>+} // namespace WebCore
>+
>+#endif // ENABLE((ACCESSIBILITY_ISOLATED_TREE))
>Index: Source/WebCore/accessibility/mac/AXObjectCacheMac.mm
>===================================================================
>--- Source/WebCore/accessibility/mac/AXObjectCacheMac.mm	(revision 240246)
>+++ Source/WebCore/accessibility/mac/AXObjectCacheMac.mm	(working copy)
>@@ -28,6 +28,7 @@
> 
> #if HAVE(ACCESSIBILITY) && PLATFORM(MAC)
> 
>+#import "AXIsolatedTreeNode.h"
> #import "AccessibilityObject.h"
> #import "AccessibilityTable.h"
> #import "RenderObject.h"
>@@ -237,6 +238,14 @@
>     obj->setWrapper(nullptr);
> }
> 
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+void AXObjectCache::associateIsolatedTreeNode(AccessibilityObject& object, AXIsolatedTreeNode& node, AXIsolatedTreeID treeID)
>+{
>+    object.wrapper().isolatedTreeIdentifier = treeID;
>+    node.setWrapper(object.wrapper());
>+}
>+#endif
>+    
> void AXObjectCache::attachWrapper(AccessibilityObject* obj)
> {
>     RetainPtr<WebAccessibilityObjectWrapper> wrapper = adoptNS([[WebAccessibilityObjectWrapper alloc] initWithAccessibilityObject:obj]);
>Index: Source/WebCore/accessibility/mac/WebAccessibilityObjectWrapperBase.h
>===================================================================
>--- Source/WebCore/accessibility/mac/WebAccessibilityObjectWrapperBase.h	(revision 240246)
>+++ Source/WebCore/accessibility/mac/WebAccessibilityObjectWrapperBase.h	(working copy)
>@@ -29,11 +29,18 @@
> #ifndef WebAccessibilityObjectWrapperBase_h
> #define WebAccessibilityObjectWrapperBase_h
> 
>+#include "AXIsolatedTree.h"
> #include "AccessibilityObject.h"
> #include <CoreGraphics/CoreGraphics.h>
>+#include <wtf/RefPtr.h>
>+#include <wtf/Variant.h>
>+#include <wtf/WeakPtr.h>
> 
> namespace WebCore {
> class AccessibilityObject;
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+class AXIsolatedTreeNode;
>+#endif
> struct AccessibilitySearchCriteria;
> class IntRect;
> class FloatPoint;
>@@ -44,13 +51,26 @@
> 
> @interface WebAccessibilityObjectWrapperBase : NSObject {
>     WebCore::AccessibilityObject* m_object;
>+    WebCore::AXID _identifier;
> }
>  
> - (id)initWithAccessibilityObject:(WebCore::AccessibilityObject*)axObject;
>+
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+@property (nonatomic, readonly) RefPtr<WebCore::AXIsolatedTreeNode> isolatedTreeNode;
>+@property (nonatomic, assign) WebCore::AXIsolatedTreeID isolatedTreeIdentifier;
>+#endif
>+
> - (void)detach;
>+
>+@property (nonatomic, assign) WebCore::AXID identifier;
>+
> - (WebCore::AccessibilityObject*)accessibilityObject;
> - (BOOL)updateObjectBackingStore;
> 
>+// This can be either an AccessibilityObject or an AXIsolatedTreeNode
>+- (WebCore::AccessibilityObjectInterface*)axBackingObject;
>+
> // These are pre-fixed with base so that AppKit does not end up calling into these directly (bypassing safety checks).
> - (NSString *)baseAccessibilityTitle;
> - (NSString *)baseAccessibilityDescription;
>Index: Source/WebCore/accessibility/mac/WebAccessibilityObjectWrapperBase.mm
>===================================================================
>--- Source/WebCore/accessibility/mac/WebAccessibilityObjectWrapperBase.mm	(revision 240246)
>+++ Source/WebCore/accessibility/mac/WebAccessibilityObjectWrapperBase.mm	(working copy)
>@@ -31,10 +31,13 @@
> 
> #if HAVE(ACCESSIBILITY)
> 
>+#import "AXIsolatedTree.h"
>+#import "AXIsolatedTreeNode.h"
> #import "AXObjectCache.h"
> #import "AccessibilityARIAGridRow.h"
> #import "AccessibilityList.h"
> #import "AccessibilityListBox.h"
>+#import "AccessibilityObjectInterface.h"
> #import "AccessibilityRenderObject.h"
> #import "AccessibilityScrollView.h"
> #import "AccessibilitySpinButton.h"
>@@ -270,6 +273,8 @@
> 
> @implementation WebAccessibilityObjectWrapperBase
> 
>+@synthesize identifier=_identifier;
>+
> - (id)initWithAccessibilityObject:(AccessibilityObject*)axObject
> {
>     if (!(self = [super init]))
>@@ -276,16 +281,30 @@
>         return nil;
> 
>     m_object = axObject;
>+    _identifier = m_object->axObjectID();
>     return self;
> }
> 
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+- (RefPtr<WebCore::AXIsolatedTreeNode>)isolatedTreeNode
>+{
>+    return AXIsolatedTree::treeForID(_isolatedTreeIdentifier)->nodeForID(_identifier);
>+}
>+
>+#endif
>+
> - (void)detach
> {
>     m_object = nullptr;
>+    _identifier = 0;
> }
> 
> - (BOOL)updateObjectBackingStore
> {
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+    AXIsolatedTree::treeForID(self.isolatedTreeIdentifier)->applyPendingChanges();
>+    return _identifier;
>+#else
>     // Calling updateBackingStore() can invalidate this element so self must be retained.
>     // If it does become invalidated, m_object will be nil.
>     CFRetain((__bridge CFTypeRef)self);
>@@ -299,6 +318,7 @@
>         return NO;
>     
>     return YES;
>+#endif
> }
> 
> - (id)attachmentView
>@@ -360,11 +380,21 @@
>     return [NSString string];
> }
> 
>+#define _axBackingObject self.axBackingObject
>+- (WebCore::AccessibilityObjectInterface*)axBackingObject
>+{
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+    return self.isolatedTreeNode.get();
>+#else
>+    return m_object;
>+#endif
>+}
>+
> - (NSString *)baseAccessibilityDescription
> {
>     // Static text objects should not have a description. Its content is communicated in its AXValue.
>     // One exception is the media control labels that have a value and a description. Those are set programatically.
>-    if (m_object->roleValue() == AccessibilityRole::StaticText && !m_object->isMediaControlLabel())
>+    if (_axBackingObject->roleValue() == AccessibilityRole::StaticText && !_axBackingObject->isMediaControlLabel())
>         return [NSString string];
>     
>     Vector<AccessibilityText> textOrder;
>Index: Source/WebCore/accessibility/mac/WebAccessibilityObjectWrapperMac.mm
>===================================================================
>--- Source/WebCore/accessibility/mac/WebAccessibilityObjectWrapperMac.mm	(revision 240246)
>+++ Source/WebCore/accessibility/mac/WebAccessibilityObjectWrapperMac.mm	(working copy)
>@@ -416,6 +416,8 @@
> #define NSAccessibilityRelativeFrameAttribute @"AXRelativeFrame"
> #endif
> 
>+#define _axBackingObject self.axBackingObject
>+
> extern "C" AXUIElementRef NSAccessibilityCreateAXUIElementRef(id element);
> 
> @implementation WebAccessibilityObjectWrapper
>@@ -1970,10 +1972,10 @@
> - (NSString*)role
> {
>     ALLOW_DEPRECATED_DECLARATIONS_BEGIN
>-    if (m_object->isAttachment())
>+    if (_axBackingObject->isAttachment())
>         return [[self attachmentView] accessibilityAttributeValue:NSAccessibilityRoleAttribute];
>     ALLOW_DEPRECATED_DECLARATIONS_END
>-    AccessibilityRole role = m_object->roleValue();
>+    AccessibilityRole role = _axBackingObject->roleValue();
> 
>     if (role == AccessibilityRole::Label && is<AccessibilityLabel>(*m_object) && downcast<AccessibilityLabel>(*m_object).containsOnlyStaticText())
>         role = AccessibilityRole::StaticText;
>@@ -2000,7 +2002,7 @@
>     if (m_object->isSearchField())
>         return NSAccessibilitySearchFieldSubrole;
>     
>-    if (m_object->isAttachment()) {
>+    if (_axBackingObject->isAttachment()) {
>         NSView* attachView = [self attachmentView];
>         if ([[attachView accessibilityAttributeNames] containsObject:NSAccessibilitySubroleAttribute])
>             return [attachView accessibilityAttributeValue:NSAccessibilitySubroleAttribute];
>@@ -2211,7 +2213,7 @@
> 
>     ALLOW_DEPRECATED_DECLARATIONS_BEGIN
>     // attachments have the AXImage role, but a different subrole
>-    if (m_object->isAttachment())
>+    if (_axBackingObject->isAttachment())
>         return [[self attachmentView] accessibilityAttributeValue:NSAccessibilityRoleDescriptionAttribute];
>     ALLOW_DEPRECATED_DECLARATIONS_END
> 
>@@ -2568,7 +2570,7 @@
>         return [NSNumber numberWithBool: m_object->isVisited()];
>     
>     if ([attributeName isEqualToString: NSAccessibilityTitleAttribute]) {
>-        if (m_object->isAttachment()) {
>+        if (_axBackingObject->isAttachment()) {
>             if ([[[self attachmentView] accessibilityAttributeNames] containsObject:NSAccessibilityTitleAttribute])
>                 return [[self attachmentView] accessibilityAttributeValue:NSAccessibilityTitleAttribute];
>         }
>@@ -2585,7 +2587,7 @@
>     }
>     
>     if ([attributeName isEqualToString: NSAccessibilityDescriptionAttribute]) {
>-        if (m_object->isAttachment()) {
>+        if (_axBackingObject->isAttachment()) {
>             if ([[[self attachmentView] accessibilityAttributeNames] containsObject:NSAccessibilityDescriptionAttribute])
>                 return [[self attachmentView] accessibilityAttributeValue:NSAccessibilityDescriptionAttribute];
>         }
>@@ -2593,7 +2595,7 @@
>     }
>     
>     if ([attributeName isEqualToString: NSAccessibilityValueAttribute]) {
>-        if (m_object->isAttachment()) {
>+        if (_axBackingObject->isAttachment()) {
>             if ([[[self attachmentView] accessibilityAttributeNames] containsObject:NSAccessibilityValueAttribute])
>                 return [[self attachmentView] accessibilityAttributeValue:NSAccessibilityValueAttribute];
>         }
>Index: Source/WebCore/dom/Document.cpp
>===================================================================
>--- Source/WebCore/dom/Document.cpp	(revision 240246)
>+++ Source/WebCore/dom/Document.cpp	(working copy)
>@@ -8215,6 +8215,11 @@
> 
>     return *m_logger;
> }
>+    
>+Optional<uint64_t> Document::pageID() const
>+{
>+    return m_frame->loader().client().pageID();
>+}
> 
> void Document::hasStorageAccess(Ref<DeferredPromise>&& promise)
> {
>Index: Source/WebCore/dom/Document.h
>===================================================================
>--- Source/WebCore/dom/Document.h	(revision 240246)
>+++ Source/WebCore/dom/Document.h	(working copy)
>@@ -648,6 +648,7 @@
>     WEBCORE_EXPORT AXObjectCache* axObjectCache() const;
>     void clearAXObjectCache();
> 
>+    Optional<uint64_t> pageID() const;
>     // to get visually ordered hebrew and arabic pages right
>     void setVisuallyOrdered();
>     bool visuallyOrdered() const { return m_visuallyOrdered; }
>Index: Source/WebKit/ChangeLog
>===================================================================
>--- Source/WebKit/ChangeLog	(revision 240246)
>+++ Source/WebKit/ChangeLog	(working copy)
>@@ -1,3 +1,15 @@
>+2019-01-11  Chris Fleizach  <cfleizach@apple.com>
>+
>+        AX: Introduce a static accessibility tree
>+        https://bugs.webkit.org/show_bug.cgi?id=193348
>+        <rdar://problem/47203295>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Configurations/FeatureDefines.xcconfig:
>+        * WebProcess/WebPage/mac/WKAccessibilityWebPageObjectBase.mm:
>+        (-[WKAccessibilityWebPageObjectBase accessibilityRootObjectWrapper]):
>+
> 2019-01-21  Brent Fulgham  <bfulgham@apple.com>
> 
>         Implement message handlers for NetworkProcess-based ResourceLoadStatistics
>Index: Source/WebKit/Configurations/FeatureDefines.xcconfig
>===================================================================
>--- Source/WebKit/Configurations/FeatureDefines.xcconfig	(revision 240206)
>+++ Source/WebKit/Configurations/FeatureDefines.xcconfig	(working copy)
>@@ -40,6 +40,8 @@
> ENABLE_ACCELERATED_OVERFLOW_SCROLLING = $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING_$(WK_COCOA_TOUCH));
> ENABLE_ACCELERATED_OVERFLOW_SCROLLING_cocoatouch = ENABLE_ACCELERATED_OVERFLOW_SCROLLING;
> 
>+ENABLE_ACCESSIBILITY_ISOLATED_TREE = ;
>+
> ENABLE_APPLE_PAY = $(ENABLE_APPLE_PAY_$(WK_PLATFORM_NAME));
> ENABLE_APPLE_PAY_iphoneos = ENABLE_APPLE_PAY;
> ENABLE_APPLE_PAY_iphonesimulator = ENABLE_APPLE_PAY;
>@@ -406,4 +408,4 @@
> 
> ENABLE_XSLT = ENABLE_XSLT;
> 
>-FEATURE_DEFINES = $(ENABLE_3D_TRANSFORMS) $(ENABLE_ACCELERATED_2D_CANVAS) $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING) $(ENABLE_APPLE_PAY) $(ENABLE_APPLE_PAY_SESSION_V3) $(ENABLE_APPLE_PAY_SESSION_V4) $(ENABLE_APPLICATION_MANIFEST) $(ENABLE_ATTACHMENT_ELEMENT) $(ENABLE_AVF_CAPTIONS) $(ENABLE_C_LOOP) $(ENABLE_CACHE_PARTITIONING) $(ENABLE_CHANNEL_MESSAGING) $(ENABLE_CONTENT_FILTERING) $(ENABLE_CSS3_TEXT) $(ENABLE_CSS_BOX_DECORATION_BREAK) $(ENABLE_CSS_COMPOSITING) $(ENABLE_CSS_DEVICE_ADAPTATION) $(ENABLE_CSS_IMAGE_ORIENTATION) $(ENABLE_CSS_IMAGE_RESOLUTION) $(ENABLE_CSS_PAINTING_API) $(ENABLE_CSS_SCROLL_SNAP) $(ENABLE_CSS_SELECTORS_LEVEL4) $(ENABLE_CSS_TRAILING_WORD) $(ENABLE_CSS_TYPED_OM) $(ENABLE_CURSOR_VISIBILITY) $(ENABLE_CUSTOM_SCHEME_HANDLER) $(ENABLE_CSS_CONIC_GRADIENTS) $(ENABLE_DARK_MODE_CSS) $(ENABLE_DASHBOARD_SUPPORT) $(ENABLE_DATA_INTERACTION) $(ENABLE_DATACUE_VALUE) $(ENABLE_DATALIST_ELEMENT) $(ENABLE_DEVICE_ORIENTATION) $(ENABLE_DRAG_SUPPORT) $(ENABLE_ENCRYPTED_MEDIA) $(ENABLE_EXPERIMENTAL_FEATURES) $(ENABLE_FAST_JIT_PERMISSIONS) $(ENABLE_FILTERS_LEVEL_2) $(ENABLE_FTL_JIT) $(ENABLE_FULLSCREEN_API) $(ENABLE_GAMEPAD) $(ENABLE_GEOLOCATION) $(ENABLE_ICONDATABASE) $(ENABLE_INDEXED_DATABASE) $(ENABLE_INDEXED_DATABASE_IN_WORKERS) $(ENABLE_INPUT_TYPE_COLOR) $(ENABLE_INPUT_TYPE_DATE) $(ENABLE_INPUT_TYPE_DATETIME_INCOMPLETE) $(ENABLE_INPUT_TYPE_DATETIMELOCAL) $(ENABLE_INPUT_TYPE_MONTH) $(ENABLE_INPUT_TYPE_TIME) $(ENABLE_INPUT_TYPE_WEEK) $(ENABLE_INTERSECTION_OBSERVER) $(ENABLE_INTL) $(ENABLE_IOS_GESTURE_EVENTS) $(ENABLE_IOS_TOUCH_EVENTS) $(ENABLE_JIT) $(ENABLE_KEYBOARD_CODE_ATTRIBUTE) $(ENABLE_KEYBOARD_KEY_ATTRIBUTE) $(ENABLE_LAYOUT_FORMATTING_CONTEXT) $(ENABLE_LEGACY_CSS_VENDOR_PREFIXES) $(ENABLE_LEGACY_CUSTOM_PROTOCOL_MANAGER) $(ENABLE_LEGACY_ENCRYPTED_MEDIA) $(ENABLE_LETTERPRESS) $(ENABLE_MAC_GESTURE_EVENTS) $(ENABLE_MAC_VIDEO_TOOLBOX) $(ENABLE_MATHML) $(ENABLE_MEDIA_CAPTURE) $(ENABLE_MEDIA_CONTROLS_SCRIPT) $(ENABLE_MEDIA_SESSION) $(ENABLE_MEDIA_SOURCE) $(ENABLE_MEDIA_STATISTICS) $(ENABLE_MEDIA_STREAM) $(ENABLE_METER_ELEMENT) $(ENABLE_MHTML) $(ENABLE_MOUSE_CURSOR_SCALE) $(ENABLE_NAVIGATOR_CONTENT_UTILS) $(ENABLE_NAVIGATOR_STANDALONE) $(ENABLE_NOTIFICATIONS) $(ENABLE_PAYMENT_REQUEST) $(ENABLE_PDFKIT_PLUGIN) $(ENABLE_POINTER_EVENTS) $(ENABLE_POINTER_LOCK) $(ENABLE_PUBLIC_SUFFIX_LIST) $(ENABLE_QUOTA) $(ENABLE_REMOTE_INSPECTOR) $(ENABLE_RESOLUTION_MEDIA_QUERY) $(ENABLE_RESOURCE_LOAD_STATISTICS) $(ENABLE_RESOURCE_USAGE) $(ENABLE_RUBBER_BANDING) $(ENABLE_SERVICE_CONTROLS) $(ENABLE_SERVICE_WORKER) $(ENABLE_SPEECH_SYNTHESIS) $(ENABLE_STREAMS_API) $(ENABLE_WEB_CRYPTO) $(ENABLE_SVG_FONTS) $(ENABLE_TELEPHONE_NUMBER_DETECTION) $(ENABLE_TEXT_AUTOSIZING) $(ENABLE_TOUCH_EVENTS) $(ENABLE_USER_MESSAGE_HANDLERS) $(ENABLE_USERSELECT_ALL) $(ENABLE_VARIATION_FONTS) $(ENABLE_VIDEO) $(ENABLE_VIDEO_PRESENTATION_MODE) $(ENABLE_VIDEO_TRACK) $(ENABLE_VIDEO_USES_ELEMENT_FULLSCREEN) $(ENABLE_WEB_API_STATISTICS) $(ENABLE_WEB_AUDIO) $(ENABLE_WEB_AUTHN) $(ENABLE_WEB_RTC) $(ENABLE_WEBASSEMBLY) $(ENABLE_WEBASSEMBLY_STREAMING_API) $(ENABLE_WEBGL) $(ENABLE_WEBGL2) $(ENABLE_WEBGPU) $(ENABLE_WEBMETAL) $(ENABLE_WIRELESS_PLAYBACK_TARGET) $(ENABLE_XSLT);
>+FEATURE_DEFINES = $(ENABLE_3D_TRANSFORMS) $(ENABLE_ACCELERATED_2D_CANVAS) $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING) $(ENABLE_ACCESSIBILITY_ISOLATED_TREE) $(ENABLE_APPLE_PAY) $(ENABLE_APPLE_PAY_SESSION_V3) $(ENABLE_APPLE_PAY_SESSION_V4) $(ENABLE_APPLICATION_MANIFEST) $(ENABLE_ATTACHMENT_ELEMENT) $(ENABLE_AVF_CAPTIONS) $(ENABLE_C_LOOP) $(ENABLE_CACHE_PARTITIONING) $(ENABLE_CHANNEL_MESSAGING) $(ENABLE_CONTENT_FILTERING) $(ENABLE_CSS3_TEXT) $(ENABLE_CSS_BOX_DECORATION_BREAK) $(ENABLE_CSS_COMPOSITING) $(ENABLE_CSS_DEVICE_ADAPTATION) $(ENABLE_CSS_IMAGE_ORIENTATION) $(ENABLE_CSS_IMAGE_RESOLUTION) $(ENABLE_CSS_PAINTING_API) $(ENABLE_CSS_SCROLL_SNAP) $(ENABLE_CSS_SELECTORS_LEVEL4) $(ENABLE_CSS_TRAILING_WORD) $(ENABLE_CSS_TYPED_OM) $(ENABLE_CURSOR_VISIBILITY) $(ENABLE_CUSTOM_SCHEME_HANDLER) $(ENABLE_CSS_CONIC_GRADIENTS) $(ENABLE_DARK_MODE_CSS) $(ENABLE_DASHBOARD_SUPPORT) $(ENABLE_DATA_INTERACTION) $(ENABLE_DATACUE_VALUE) $(ENABLE_DATALIST_ELEMENT) $(ENABLE_DEVICE_ORIENTATION) $(ENABLE_DRAG_SUPPORT) $(ENABLE_ENCRYPTED_MEDIA) $(ENABLE_EXPERIMENTAL_FEATURES) $(ENABLE_FAST_JIT_PERMISSIONS) $(ENABLE_FILTERS_LEVEL_2) $(ENABLE_FTL_JIT) $(ENABLE_FULLSCREEN_API) $(ENABLE_GAMEPAD) $(ENABLE_GEOLOCATION) $(ENABLE_ICONDATABASE) $(ENABLE_INDEXED_DATABASE) $(ENABLE_INDEXED_DATABASE_IN_WORKERS) $(ENABLE_INPUT_TYPE_COLOR) $(ENABLE_INPUT_TYPE_DATE) $(ENABLE_INPUT_TYPE_DATETIME_INCOMPLETE) $(ENABLE_INPUT_TYPE_DATETIMELOCAL) $(ENABLE_INPUT_TYPE_MONTH) $(ENABLE_INPUT_TYPE_TIME) $(ENABLE_INPUT_TYPE_WEEK) $(ENABLE_INTERSECTION_OBSERVER) $(ENABLE_INTL) $(ENABLE_IOS_GESTURE_EVENTS) $(ENABLE_IOS_TOUCH_EVENTS) $(ENABLE_JIT) $(ENABLE_KEYBOARD_CODE_ATTRIBUTE) $(ENABLE_KEYBOARD_KEY_ATTRIBUTE) $(ENABLE_LAYOUT_FORMATTING_CONTEXT) $(ENABLE_LEGACY_CSS_VENDOR_PREFIXES) $(ENABLE_LEGACY_CUSTOM_PROTOCOL_MANAGER) $(ENABLE_LEGACY_ENCRYPTED_MEDIA) $(ENABLE_LETTERPRESS) $(ENABLE_MAC_GESTURE_EVENTS) $(ENABLE_MAC_VIDEO_TOOLBOX) $(ENABLE_MATHML) $(ENABLE_MEDIA_CAPTURE) $(ENABLE_MEDIA_CONTROLS_SCRIPT) $(ENABLE_MEDIA_SESSION) $(ENABLE_MEDIA_SOURCE) $(ENABLE_MEDIA_STATISTICS) $(ENABLE_MEDIA_STREAM) $(ENABLE_METER_ELEMENT) $(ENABLE_MHTML) $(ENABLE_MOUSE_CURSOR_SCALE) $(ENABLE_NAVIGATOR_CONTENT_UTILS) $(ENABLE_NAVIGATOR_STANDALONE) $(ENABLE_NOTIFICATIONS) $(ENABLE_PAYMENT_REQUEST) $(ENABLE_PDFKIT_PLUGIN) $(ENABLE_POINTER_EVENTS) $(ENABLE_POINTER_LOCK) $(ENABLE_PUBLIC_SUFFIX_LIST) $(ENABLE_QUOTA) $(ENABLE_REMOTE_INSPECTOR) $(ENABLE_RESOLUTION_MEDIA_QUERY) $(ENABLE_RESOURCE_LOAD_STATISTICS) $(ENABLE_RESOURCE_USAGE) $(ENABLE_RUBBER_BANDING) $(ENABLE_SERVICE_CONTROLS) $(ENABLE_SERVICE_WORKER) $(ENABLE_SPEECH_SYNTHESIS) $(ENABLE_STREAMS_API) $(ENABLE_WEB_CRYPTO) $(ENABLE_SVG_FONTS) $(ENABLE_TELEPHONE_NUMBER_DETECTION) $(ENABLE_TEXT_AUTOSIZING) $(ENABLE_TOUCH_EVENTS) $(ENABLE_USER_MESSAGE_HANDLERS) $(ENABLE_USERSELECT_ALL) $(ENABLE_VARIATION_FONTS) $(ENABLE_VIDEO) $(ENABLE_VIDEO_PRESENTATION_MODE) $(ENABLE_VIDEO_TRACK) $(ENABLE_VIDEO_USES_ELEMENT_FULLSCREEN) $(ENABLE_WEB_API_STATISTICS) $(ENABLE_WEB_AUDIO) $(ENABLE_WEB_AUTHN) $(ENABLE_WEB_RTC) $(ENABLE_WEBASSEMBLY) $(ENABLE_WEBASSEMBLY_STREAMING_API) $(ENABLE_WEBGL) $(ENABLE_WEBGL2) $(ENABLE_WEBGPU) $(ENABLE_WEBMETAL) $(ENABLE_WIRELESS_PLAYBACK_TARGET) $(ENABLE_XSLT);
>Index: Source/WebKit/WebKit.xcodeproj/project.pbxproj
>===================================================================
>--- Source/WebKit/WebKit.xcodeproj/project.pbxproj	(revision 240246)
>+++ Source/WebKit/WebKit.xcodeproj/project.pbxproj	(working copy)
>@@ -2443,6 +2443,7 @@
> 		29AD3097164B4E210072DEA9 /* LegacyCustomProtocolManagerProxy.messages.in */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; name = LegacyCustomProtocolManagerProxy.messages.in; path = CustomProtocols/LegacyCustomProtocolManagerProxy.messages.in; sourceTree = "<group>"; };
> 		29CD55A8128E294F00133C85 /* WKAccessibilityWebPageObjectBase.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WKAccessibilityWebPageObjectBase.h; sourceTree = "<group>"; };
> 		29CD55A9128E294F00133C85 /* WKAccessibilityWebPageObjectBase.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = WKAccessibilityWebPageObjectBase.mm; sourceTree = "<group>"; };
>+		29D04E2821F7C73D0076741D /* AccessibilityPrivSPI.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = AccessibilityPrivSPI.h; sourceTree = "<group>"; };
> 		2D0035221BC7414800DA8716 /* PDFPlugin.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = PDFPlugin.h; path = PDF/PDFPlugin.h; sourceTree = "<group>"; };
> 		2D0035231BC7414800DA8716 /* PDFPlugin.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; name = PDFPlugin.mm; path = PDF/PDFPlugin.mm; sourceTree = "<group>"; };
> 		2D10875E1D2C573E00B85F82 /* LoadParameters.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = LoadParameters.cpp; sourceTree = "<group>"; };
>@@ -7066,6 +7067,7 @@
> 			children = (
> 				F48D2A8421583A0200C6752B /* AppKitSPI.h */,
> 				A1E6886F1F6E2BAB007006A6 /* QuarantineSPI.h */,
>+				29D04E2821F7C73D0076741D /* AccessibilityPrivSPI.h */,
> 			);
> 			path = mac;
> 			sourceTree = "<group>";
>Index: Source/WebKit/WebProcess/WebPage/mac/WKAccessibilityWebPageObjectBase.mm
>===================================================================
>--- Source/WebKit/WebProcess/WebPage/mac/WKAccessibilityWebPageObjectBase.mm	(revision 240246)
>+++ Source/WebKit/WebProcess/WebPage/mac/WKAccessibilityWebPageObjectBase.mm	(working copy)
>@@ -34,6 +34,7 @@
> #import "WKSharedAPICast.h"
> #import "WKString.h"
> #import "WKStringCF.h"
>+#import <WebCore/AXIsolatedTree.h>
> #import <WebCore/AXObjectCache.h>
> #import <WebCore/Document.h>
> #import <WebCore/Frame.h>
>@@ -46,34 +47,78 @@
> using namespace WebKit;
> 
> @implementation WKAccessibilityWebPageObjectBase
>+{
>+    uint64_t m_pageID;
>+    bool m_hasPlugin;
>+}
> 
>-- (id)accessibilityRootObjectWrapper
>+- (WebCore::AXObjectCache*)axObjectCache
> {
>-    if (!WebCore::AXObjectCache::accessibilityEnabled())
>-        WebCore::AXObjectCache::enableAccessibility();
>-
>-    if (!m_page)
>-        return nil;
>-    
>-    NSObject* mainFramePluginAccessibilityObjectWrapper = m_page->accessibilityObjectForMainFramePlugin();
>-    if (mainFramePluginAccessibilityObjectWrapper)
>-        return mainFramePluginAccessibilityObjectWrapper;
>-
>     WebCore::Page* page = m_page->corePage();
>     if (!page)
>         return nil;
>-    
>     WebCore::Frame& core = page->mainFrame();
>     if (!core.document())
>         return nil;
>+
>+    return core.document()->axObjectCache();
>+}
>+
>+- (id)accessibilityPluginObject
>+{
>+    auto retrieveBlock = [&self]() -> id {
>+        id axPlugin = nil;
>+        auto dispatchBlock = [&axPlugin, &self] {
>+            if (self->m_page)
>+                axPlugin = self->m_page->accessibilityObjectForMainFramePlugin();
>+        };
>+
>+        if (RunLoop::isMain())
>+            dispatchBlock();
>+        else
>+            dispatch_sync(dispatch_get_main_queue(), dispatchBlock);
>+        return axPlugin;
>+    };
>     
>-    WebCore::AXObjectCache* cache = core.document()->axObjectCache();
>-    if (!cache)
>-        return nil;
>-    
>-    if (WebCore::AccessibilityObject* root = cache->rootObject())
>-        return root->wrapper();
>-    
>+    return retrieveBlock();
>+}
>+
>+- (id)accessibilityRootObjectWrapper
>+{
>+    if (!WebCore::AXObjectCache::accessibilityEnabled())
>+        WebCore::AXObjectCache::enableAccessibility();
>+
>+    if (m_hasPlugin)
>+        return self.accessibilityPluginObject;
>+
>+#if ENABLE(ACCESSIBILITY_ISOLATED_TREE)
>+    auto generateBlock = [&] {
>+        auto dispatchBlock = [&self] {
>+            if (AXObjectCache* cache = [self axObjectCache]) {
>+                auto tree = cache->generateStaticAccessibilityTreeIfNeeded();
>+                tree->applyPendingChanges();
>+            }
>+        };
>+
>+        if (RunLoop::isMain())
>+            dispatchBlock();
>+        else
>+            dispatch_sync(dispatch_get_main_queue(), dispatchBlock);
>+    };
>+
>+    auto tree = AXIsolatedTree::treeForPageID(m_pageID);
>+    auto rootNode = tree->rootNode();
>+    if (!rootNode)
>+        generateBlock();
>+
>+    if ((rootNode = tree->rootNode()))
>+        return rootNode->wrapper();
>+#else
>+    if (AXObjectCache* cache = [self axObjectCache]) {
>+        if (WebCore::AccessibilityObject* root = cache->rootObject())
>+            return root->wrapper();
>+    }
>+#endif
>     return nil;
> }
> 
>@@ -80,6 +125,15 @@
> - (void)setWebPage:(WebPage*)page
> {
>     m_page = page;
>+    
>+    if (page) {
>+        m_pageID = page->pageID();
>+        m_hasPlugin = page->accessibilityObjectForMainFramePlugin();
>+    }
>+    else {
>+        m_pageID = 0;
>+        m_hasPlugin = false;
>+    }
> }
> 
> - (void)setRemoteParent:(id)parent
>Index: Source/WebKitLegacy/mac/ChangeLog
>===================================================================
>--- Source/WebKitLegacy/mac/ChangeLog	(revision 240246)
>+++ Source/WebKitLegacy/mac/ChangeLog	(working copy)
>@@ -1,3 +1,13 @@
>+2019-01-11  Chris Fleizach  <cfleizach@apple.com>
>+
>+        AX: Introduce a static accessibility tree
>+        https://bugs.webkit.org/show_bug.cgi?id=193348
>+        <rdar://problem/47203295>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Configurations/FeatureDefines.xcconfig:
>+
> 2019-01-15  Darin Adler  <darin@apple.com>
> 
>         Use references rather than pointers for register/unregister functions, and more
>Index: Source/WebKitLegacy/mac/Configurations/FeatureDefines.xcconfig
>===================================================================
>--- Source/WebKitLegacy/mac/Configurations/FeatureDefines.xcconfig	(revision 240206)
>+++ Source/WebKitLegacy/mac/Configurations/FeatureDefines.xcconfig	(working copy)
>@@ -40,6 +40,8 @@
> ENABLE_ACCELERATED_OVERFLOW_SCROLLING = $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING_$(WK_COCOA_TOUCH));
> ENABLE_ACCELERATED_OVERFLOW_SCROLLING_cocoatouch = ENABLE_ACCELERATED_OVERFLOW_SCROLLING;
> 
>+ENABLE_ACCESSIBILITY_ISOLATED_TREE = ;
>+
> ENABLE_APPLE_PAY = $(ENABLE_APPLE_PAY_$(WK_PLATFORM_NAME));
> ENABLE_APPLE_PAY_iphoneos = ENABLE_APPLE_PAY;
> ENABLE_APPLE_PAY_iphonesimulator = ENABLE_APPLE_PAY;
>@@ -406,4 +408,4 @@
> 
> ENABLE_XSLT = ENABLE_XSLT;
> 
>-FEATURE_DEFINES = $(ENABLE_3D_TRANSFORMS) $(ENABLE_ACCELERATED_2D_CANVAS) $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING) $(ENABLE_APPLE_PAY) $(ENABLE_APPLE_PAY_SESSION_V3) $(ENABLE_APPLE_PAY_SESSION_V4) $(ENABLE_APPLICATION_MANIFEST) $(ENABLE_ATTACHMENT_ELEMENT) $(ENABLE_AVF_CAPTIONS) $(ENABLE_C_LOOP) $(ENABLE_CACHE_PARTITIONING) $(ENABLE_CHANNEL_MESSAGING) $(ENABLE_CONTENT_FILTERING) $(ENABLE_CSS3_TEXT) $(ENABLE_CSS_BOX_DECORATION_BREAK) $(ENABLE_CSS_COMPOSITING) $(ENABLE_CSS_DEVICE_ADAPTATION) $(ENABLE_CSS_IMAGE_ORIENTATION) $(ENABLE_CSS_IMAGE_RESOLUTION) $(ENABLE_CSS_PAINTING_API) $(ENABLE_CSS_SCROLL_SNAP) $(ENABLE_CSS_SELECTORS_LEVEL4) $(ENABLE_CSS_TRAILING_WORD) $(ENABLE_CSS_TYPED_OM) $(ENABLE_CURSOR_VISIBILITY) $(ENABLE_CUSTOM_SCHEME_HANDLER) $(ENABLE_CSS_CONIC_GRADIENTS) $(ENABLE_DARK_MODE_CSS) $(ENABLE_DASHBOARD_SUPPORT) $(ENABLE_DATA_INTERACTION) $(ENABLE_DATACUE_VALUE) $(ENABLE_DATALIST_ELEMENT) $(ENABLE_DEVICE_ORIENTATION) $(ENABLE_DRAG_SUPPORT) $(ENABLE_ENCRYPTED_MEDIA) $(ENABLE_EXPERIMENTAL_FEATURES) $(ENABLE_FAST_JIT_PERMISSIONS) $(ENABLE_FILTERS_LEVEL_2) $(ENABLE_FTL_JIT) $(ENABLE_FULLSCREEN_API) $(ENABLE_GAMEPAD) $(ENABLE_GEOLOCATION) $(ENABLE_ICONDATABASE) $(ENABLE_INDEXED_DATABASE) $(ENABLE_INDEXED_DATABASE_IN_WORKERS) $(ENABLE_INPUT_TYPE_COLOR) $(ENABLE_INPUT_TYPE_DATE) $(ENABLE_INPUT_TYPE_DATETIME_INCOMPLETE) $(ENABLE_INPUT_TYPE_DATETIMELOCAL) $(ENABLE_INPUT_TYPE_MONTH) $(ENABLE_INPUT_TYPE_TIME) $(ENABLE_INPUT_TYPE_WEEK) $(ENABLE_INTERSECTION_OBSERVER) $(ENABLE_INTL) $(ENABLE_IOS_GESTURE_EVENTS) $(ENABLE_IOS_TOUCH_EVENTS) $(ENABLE_JIT) $(ENABLE_KEYBOARD_CODE_ATTRIBUTE) $(ENABLE_KEYBOARD_KEY_ATTRIBUTE) $(ENABLE_LAYOUT_FORMATTING_CONTEXT) $(ENABLE_LEGACY_CSS_VENDOR_PREFIXES) $(ENABLE_LEGACY_CUSTOM_PROTOCOL_MANAGER) $(ENABLE_LEGACY_ENCRYPTED_MEDIA) $(ENABLE_LETTERPRESS) $(ENABLE_MAC_GESTURE_EVENTS) $(ENABLE_MAC_VIDEO_TOOLBOX) $(ENABLE_MATHML) $(ENABLE_MEDIA_CAPTURE) $(ENABLE_MEDIA_CONTROLS_SCRIPT) $(ENABLE_MEDIA_SESSION) $(ENABLE_MEDIA_SOURCE) $(ENABLE_MEDIA_STATISTICS) $(ENABLE_MEDIA_STREAM) $(ENABLE_METER_ELEMENT) $(ENABLE_MHTML) $(ENABLE_MOUSE_CURSOR_SCALE) $(ENABLE_NAVIGATOR_CONTENT_UTILS) $(ENABLE_NAVIGATOR_STANDALONE) $(ENABLE_NOTIFICATIONS) $(ENABLE_PAYMENT_REQUEST) $(ENABLE_PDFKIT_PLUGIN) $(ENABLE_POINTER_EVENTS) $(ENABLE_POINTER_LOCK) $(ENABLE_PUBLIC_SUFFIX_LIST) $(ENABLE_QUOTA) $(ENABLE_REMOTE_INSPECTOR) $(ENABLE_RESOLUTION_MEDIA_QUERY) $(ENABLE_RESOURCE_LOAD_STATISTICS) $(ENABLE_RESOURCE_USAGE) $(ENABLE_RUBBER_BANDING) $(ENABLE_SERVICE_CONTROLS) $(ENABLE_SERVICE_WORKER) $(ENABLE_SPEECH_SYNTHESIS) $(ENABLE_STREAMS_API) $(ENABLE_WEB_CRYPTO) $(ENABLE_SVG_FONTS) $(ENABLE_TELEPHONE_NUMBER_DETECTION) $(ENABLE_TEXT_AUTOSIZING) $(ENABLE_TOUCH_EVENTS) $(ENABLE_USER_MESSAGE_HANDLERS) $(ENABLE_USERSELECT_ALL) $(ENABLE_VARIATION_FONTS) $(ENABLE_VIDEO) $(ENABLE_VIDEO_PRESENTATION_MODE) $(ENABLE_VIDEO_TRACK) $(ENABLE_VIDEO_USES_ELEMENT_FULLSCREEN) $(ENABLE_WEB_API_STATISTICS) $(ENABLE_WEB_AUDIO) $(ENABLE_WEB_AUTHN) $(ENABLE_WEB_RTC) $(ENABLE_WEBASSEMBLY) $(ENABLE_WEBASSEMBLY_STREAMING_API) $(ENABLE_WEBGL) $(ENABLE_WEBGL2) $(ENABLE_WEBGPU) $(ENABLE_WEBMETAL) $(ENABLE_WIRELESS_PLAYBACK_TARGET) $(ENABLE_XSLT);
>+FEATURE_DEFINES = $(ENABLE_3D_TRANSFORMS) $(ENABLE_ACCELERATED_2D_CANVAS) $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING) $(ENABLE_ACCESSIBILITY_ISOLATED_TREE) $(ENABLE_APPLE_PAY) $(ENABLE_APPLE_PAY_SESSION_V3) $(ENABLE_APPLE_PAY_SESSION_V4) $(ENABLE_APPLICATION_MANIFEST) $(ENABLE_ATTACHMENT_ELEMENT) $(ENABLE_AVF_CAPTIONS) $(ENABLE_C_LOOP) $(ENABLE_CACHE_PARTITIONING) $(ENABLE_CHANNEL_MESSAGING) $(ENABLE_CONTENT_FILTERING) $(ENABLE_CSS3_TEXT) $(ENABLE_CSS_BOX_DECORATION_BREAK) $(ENABLE_CSS_COMPOSITING) $(ENABLE_CSS_DEVICE_ADAPTATION) $(ENABLE_CSS_IMAGE_ORIENTATION) $(ENABLE_CSS_IMAGE_RESOLUTION) $(ENABLE_CSS_PAINTING_API) $(ENABLE_CSS_SCROLL_SNAP) $(ENABLE_CSS_SELECTORS_LEVEL4) $(ENABLE_CSS_TRAILING_WORD) $(ENABLE_CSS_TYPED_OM) $(ENABLE_CURSOR_VISIBILITY) $(ENABLE_CUSTOM_SCHEME_HANDLER) $(ENABLE_CSS_CONIC_GRADIENTS) $(ENABLE_DARK_MODE_CSS) $(ENABLE_DASHBOARD_SUPPORT) $(ENABLE_DATA_INTERACTION) $(ENABLE_DATACUE_VALUE) $(ENABLE_DATALIST_ELEMENT) $(ENABLE_DEVICE_ORIENTATION) $(ENABLE_DRAG_SUPPORT) $(ENABLE_ENCRYPTED_MEDIA) $(ENABLE_EXPERIMENTAL_FEATURES) $(ENABLE_FAST_JIT_PERMISSIONS) $(ENABLE_FILTERS_LEVEL_2) $(ENABLE_FTL_JIT) $(ENABLE_FULLSCREEN_API) $(ENABLE_GAMEPAD) $(ENABLE_GEOLOCATION) $(ENABLE_ICONDATABASE) $(ENABLE_INDEXED_DATABASE) $(ENABLE_INDEXED_DATABASE_IN_WORKERS) $(ENABLE_INPUT_TYPE_COLOR) $(ENABLE_INPUT_TYPE_DATE) $(ENABLE_INPUT_TYPE_DATETIME_INCOMPLETE) $(ENABLE_INPUT_TYPE_DATETIMELOCAL) $(ENABLE_INPUT_TYPE_MONTH) $(ENABLE_INPUT_TYPE_TIME) $(ENABLE_INPUT_TYPE_WEEK) $(ENABLE_INTERSECTION_OBSERVER) $(ENABLE_INTL) $(ENABLE_IOS_GESTURE_EVENTS) $(ENABLE_IOS_TOUCH_EVENTS) $(ENABLE_JIT) $(ENABLE_KEYBOARD_CODE_ATTRIBUTE) $(ENABLE_KEYBOARD_KEY_ATTRIBUTE) $(ENABLE_LAYOUT_FORMATTING_CONTEXT) $(ENABLE_LEGACY_CSS_VENDOR_PREFIXES) $(ENABLE_LEGACY_CUSTOM_PROTOCOL_MANAGER) $(ENABLE_LEGACY_ENCRYPTED_MEDIA) $(ENABLE_LETTERPRESS) $(ENABLE_MAC_GESTURE_EVENTS) $(ENABLE_MAC_VIDEO_TOOLBOX) $(ENABLE_MATHML) $(ENABLE_MEDIA_CAPTURE) $(ENABLE_MEDIA_CONTROLS_SCRIPT) $(ENABLE_MEDIA_SESSION) $(ENABLE_MEDIA_SOURCE) $(ENABLE_MEDIA_STATISTICS) $(ENABLE_MEDIA_STREAM) $(ENABLE_METER_ELEMENT) $(ENABLE_MHTML) $(ENABLE_MOUSE_CURSOR_SCALE) $(ENABLE_NAVIGATOR_CONTENT_UTILS) $(ENABLE_NAVIGATOR_STANDALONE) $(ENABLE_NOTIFICATIONS) $(ENABLE_PAYMENT_REQUEST) $(ENABLE_PDFKIT_PLUGIN) $(ENABLE_POINTER_EVENTS) $(ENABLE_POINTER_LOCK) $(ENABLE_PUBLIC_SUFFIX_LIST) $(ENABLE_QUOTA) $(ENABLE_REMOTE_INSPECTOR) $(ENABLE_RESOLUTION_MEDIA_QUERY) $(ENABLE_RESOURCE_LOAD_STATISTICS) $(ENABLE_RESOURCE_USAGE) $(ENABLE_RUBBER_BANDING) $(ENABLE_SERVICE_CONTROLS) $(ENABLE_SERVICE_WORKER) $(ENABLE_SPEECH_SYNTHESIS) $(ENABLE_STREAMS_API) $(ENABLE_WEB_CRYPTO) $(ENABLE_SVG_FONTS) $(ENABLE_TELEPHONE_NUMBER_DETECTION) $(ENABLE_TEXT_AUTOSIZING) $(ENABLE_TOUCH_EVENTS) $(ENABLE_USER_MESSAGE_HANDLERS) $(ENABLE_USERSELECT_ALL) $(ENABLE_VARIATION_FONTS) $(ENABLE_VIDEO) $(ENABLE_VIDEO_PRESENTATION_MODE) $(ENABLE_VIDEO_TRACK) $(ENABLE_VIDEO_USES_ELEMENT_FULLSCREEN) $(ENABLE_WEB_API_STATISTICS) $(ENABLE_WEB_AUDIO) $(ENABLE_WEB_AUTHN) $(ENABLE_WEB_RTC) $(ENABLE_WEBASSEMBLY) $(ENABLE_WEBASSEMBLY_STREAMING_API) $(ENABLE_WEBGL) $(ENABLE_WEBGL2) $(ENABLE_WEBGPU) $(ENABLE_WEBMETAL) $(ENABLE_WIRELESS_PLAYBACK_TARGET) $(ENABLE_XSLT);
>Index: Source/cmake/WebKitFeatures.cmake
>===================================================================
>--- Source/cmake/WebKitFeatures.cmake	(revision 240246)
>+++ Source/cmake/WebKitFeatures.cmake	(working copy)
>@@ -187,6 +187,7 @@
>     WEBKIT_OPTION_DEFINE(ENABLE_SMOOTH_SCROLLING "Toggle smooth scrolling" PRIVATE ON)
>     WEBKIT_OPTION_DEFINE(ENABLE_SPEECH_SYNTHESIS "Toggle Speech Synthesis API support" PRIVATE OFF)
>     WEBKIT_OPTION_DEFINE(ENABLE_SPELLCHECK "Toggle Spellchecking support (requires Enchant)" PRIVATE OFF)
>+    WEBKIT_OPTION_DEFINE(ENABLE_ACCESSIBILITY_STATIC_TREE "Toggle static accessibility tree support" PRIVATE OFF)
>     WEBKIT_OPTION_DEFINE(ENABLE_STREAMS_API "Toggle Streams API support" PRIVATE ON)
>     WEBKIT_OPTION_DEFINE(ENABLE_SVG_FONTS "Toggle SVG Fonts support" PRIVATE ON)
>     WEBKIT_OPTION_DEFINE(ENABLE_TELEPHONE_NUMBER_DETECTION "Toggle telephone number detection support" PRIVATE OFF)
>Index: Tools/ChangeLog
>===================================================================
>--- Tools/ChangeLog	(revision 240246)
>+++ Tools/ChangeLog	(working copy)
>@@ -1,3 +1,13 @@
>+2019-01-11  Chris Fleizach  <cfleizach@apple.com>
>+
>+        AX: Introduce a static accessibility tree
>+        https://bugs.webkit.org/show_bug.cgi?id=193348
>+        <rdar://problem/47203295>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * TestWebKitAPI/Configurations/FeatureDefines.xcconfig:
>+
> 2019-01-21  Fujii Hironori  <Hironori.Fujii@sony.com>
> 
>         [GTK][WPE] libgcrypt-1.7.6 can't be compiled on Ubuntu 18.10
>Index: Tools/TestWebKitAPI/Configurations/FeatureDefines.xcconfig
>===================================================================
>--- Tools/TestWebKitAPI/Configurations/FeatureDefines.xcconfig	(revision 240206)
>+++ Tools/TestWebKitAPI/Configurations/FeatureDefines.xcconfig	(working copy)
>@@ -40,6 +40,8 @@
> ENABLE_ACCELERATED_OVERFLOW_SCROLLING = $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING_$(WK_COCOA_TOUCH));
> ENABLE_ACCELERATED_OVERFLOW_SCROLLING_cocoatouch = ENABLE_ACCELERATED_OVERFLOW_SCROLLING;
> 
>+ENABLE_ACCESSIBILITY_ISOLATED_TREE = ;
>+
> ENABLE_APPLE_PAY = $(ENABLE_APPLE_PAY_$(WK_PLATFORM_NAME));
> ENABLE_APPLE_PAY_iphoneos = ENABLE_APPLE_PAY;
> ENABLE_APPLE_PAY_iphonesimulator = ENABLE_APPLE_PAY;
>@@ -406,4 +408,4 @@
> 
> ENABLE_XSLT = ENABLE_XSLT;
> 
>-FEATURE_DEFINES = $(ENABLE_3D_TRANSFORMS) $(ENABLE_ACCELERATED_2D_CANVAS) $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING) $(ENABLE_APPLE_PAY) $(ENABLE_APPLE_PAY_SESSION_V3) $(ENABLE_APPLE_PAY_SESSION_V4) $(ENABLE_APPLICATION_MANIFEST) $(ENABLE_ATTACHMENT_ELEMENT) $(ENABLE_AVF_CAPTIONS) $(ENABLE_C_LOOP) $(ENABLE_CACHE_PARTITIONING) $(ENABLE_CHANNEL_MESSAGING) $(ENABLE_CONTENT_FILTERING) $(ENABLE_CSS3_TEXT) $(ENABLE_CSS_BOX_DECORATION_BREAK) $(ENABLE_CSS_COMPOSITING) $(ENABLE_CSS_DEVICE_ADAPTATION) $(ENABLE_CSS_IMAGE_ORIENTATION) $(ENABLE_CSS_IMAGE_RESOLUTION) $(ENABLE_CSS_PAINTING_API) $(ENABLE_CSS_SCROLL_SNAP) $(ENABLE_CSS_SELECTORS_LEVEL4) $(ENABLE_CSS_TRAILING_WORD) $(ENABLE_CSS_TYPED_OM) $(ENABLE_CURSOR_VISIBILITY) $(ENABLE_CUSTOM_SCHEME_HANDLER) $(ENABLE_CSS_CONIC_GRADIENTS) $(ENABLE_DARK_MODE_CSS) $(ENABLE_DASHBOARD_SUPPORT) $(ENABLE_DATA_INTERACTION) $(ENABLE_DATACUE_VALUE) $(ENABLE_DATALIST_ELEMENT) $(ENABLE_DEVICE_ORIENTATION) $(ENABLE_DRAG_SUPPORT) $(ENABLE_ENCRYPTED_MEDIA) $(ENABLE_EXPERIMENTAL_FEATURES) $(ENABLE_FAST_JIT_PERMISSIONS) $(ENABLE_FILTERS_LEVEL_2) $(ENABLE_FTL_JIT) $(ENABLE_FULLSCREEN_API) $(ENABLE_GAMEPAD) $(ENABLE_GEOLOCATION) $(ENABLE_ICONDATABASE) $(ENABLE_INDEXED_DATABASE) $(ENABLE_INDEXED_DATABASE_IN_WORKERS) $(ENABLE_INPUT_TYPE_COLOR) $(ENABLE_INPUT_TYPE_DATE) $(ENABLE_INPUT_TYPE_DATETIME_INCOMPLETE) $(ENABLE_INPUT_TYPE_DATETIMELOCAL) $(ENABLE_INPUT_TYPE_MONTH) $(ENABLE_INPUT_TYPE_TIME) $(ENABLE_INPUT_TYPE_WEEK) $(ENABLE_INTERSECTION_OBSERVER) $(ENABLE_INTL) $(ENABLE_IOS_GESTURE_EVENTS) $(ENABLE_IOS_TOUCH_EVENTS) $(ENABLE_JIT) $(ENABLE_KEYBOARD_CODE_ATTRIBUTE) $(ENABLE_KEYBOARD_KEY_ATTRIBUTE) $(ENABLE_LAYOUT_FORMATTING_CONTEXT) $(ENABLE_LEGACY_CSS_VENDOR_PREFIXES) $(ENABLE_LEGACY_CUSTOM_PROTOCOL_MANAGER) $(ENABLE_LEGACY_ENCRYPTED_MEDIA) $(ENABLE_LETTERPRESS) $(ENABLE_MAC_GESTURE_EVENTS) $(ENABLE_MAC_VIDEO_TOOLBOX) $(ENABLE_MATHML) $(ENABLE_MEDIA_CAPTURE) $(ENABLE_MEDIA_CONTROLS_SCRIPT) $(ENABLE_MEDIA_SESSION) $(ENABLE_MEDIA_SOURCE) $(ENABLE_MEDIA_STATISTICS) $(ENABLE_MEDIA_STREAM) $(ENABLE_METER_ELEMENT) $(ENABLE_MHTML) $(ENABLE_MOUSE_CURSOR_SCALE) $(ENABLE_NAVIGATOR_CONTENT_UTILS) $(ENABLE_NAVIGATOR_STANDALONE) $(ENABLE_NOTIFICATIONS) $(ENABLE_PAYMENT_REQUEST) $(ENABLE_PDFKIT_PLUGIN) $(ENABLE_POINTER_EVENTS) $(ENABLE_POINTER_LOCK) $(ENABLE_PUBLIC_SUFFIX_LIST) $(ENABLE_QUOTA) $(ENABLE_REMOTE_INSPECTOR) $(ENABLE_RESOLUTION_MEDIA_QUERY) $(ENABLE_RESOURCE_LOAD_STATISTICS) $(ENABLE_RESOURCE_USAGE) $(ENABLE_RUBBER_BANDING) $(ENABLE_SERVICE_CONTROLS) $(ENABLE_SERVICE_WORKER) $(ENABLE_SPEECH_SYNTHESIS) $(ENABLE_STREAMS_API) $(ENABLE_WEB_CRYPTO) $(ENABLE_SVG_FONTS) $(ENABLE_TELEPHONE_NUMBER_DETECTION) $(ENABLE_TEXT_AUTOSIZING) $(ENABLE_TOUCH_EVENTS) $(ENABLE_USER_MESSAGE_HANDLERS) $(ENABLE_USERSELECT_ALL) $(ENABLE_VARIATION_FONTS) $(ENABLE_VIDEO) $(ENABLE_VIDEO_PRESENTATION_MODE) $(ENABLE_VIDEO_TRACK) $(ENABLE_VIDEO_USES_ELEMENT_FULLSCREEN) $(ENABLE_WEB_API_STATISTICS) $(ENABLE_WEB_AUDIO) $(ENABLE_WEB_AUTHN) $(ENABLE_WEB_RTC) $(ENABLE_WEBASSEMBLY) $(ENABLE_WEBASSEMBLY_STREAMING_API) $(ENABLE_WEBGL) $(ENABLE_WEBGL2) $(ENABLE_WEBGPU) $(ENABLE_WEBMETAL) $(ENABLE_WIRELESS_PLAYBACK_TARGET) $(ENABLE_XSLT);
>+FEATURE_DEFINES = $(ENABLE_3D_TRANSFORMS) $(ENABLE_ACCELERATED_2D_CANVAS) $(ENABLE_ACCELERATED_OVERFLOW_SCROLLING) $(ENABLE_ACCESSIBILITY_ISOLATED_TREE) $(ENABLE_APPLE_PAY) $(ENABLE_APPLE_PAY_SESSION_V3) $(ENABLE_APPLE_PAY_SESSION_V4) $(ENABLE_APPLICATION_MANIFEST) $(ENABLE_ATTACHMENT_ELEMENT) $(ENABLE_AVF_CAPTIONS) $(ENABLE_C_LOOP) $(ENABLE_CACHE_PARTITIONING) $(ENABLE_CHANNEL_MESSAGING) $(ENABLE_CONTENT_FILTERING) $(ENABLE_CSS3_TEXT) $(ENABLE_CSS_BOX_DECORATION_BREAK) $(ENABLE_CSS_COMPOSITING) $(ENABLE_CSS_DEVICE_ADAPTATION) $(ENABLE_CSS_IMAGE_ORIENTATION) $(ENABLE_CSS_IMAGE_RESOLUTION) $(ENABLE_CSS_PAINTING_API) $(ENABLE_CSS_SCROLL_SNAP) $(ENABLE_CSS_SELECTORS_LEVEL4) $(ENABLE_CSS_TRAILING_WORD) $(ENABLE_CSS_TYPED_OM) $(ENABLE_CURSOR_VISIBILITY) $(ENABLE_CUSTOM_SCHEME_HANDLER) $(ENABLE_CSS_CONIC_GRADIENTS) $(ENABLE_DARK_MODE_CSS) $(ENABLE_DASHBOARD_SUPPORT) $(ENABLE_DATA_INTERACTION) $(ENABLE_DATACUE_VALUE) $(ENABLE_DATALIST_ELEMENT) $(ENABLE_DEVICE_ORIENTATION) $(ENABLE_DRAG_SUPPORT) $(ENABLE_ENCRYPTED_MEDIA) $(ENABLE_EXPERIMENTAL_FEATURES) $(ENABLE_FAST_JIT_PERMISSIONS) $(ENABLE_FILTERS_LEVEL_2) $(ENABLE_FTL_JIT) $(ENABLE_FULLSCREEN_API) $(ENABLE_GAMEPAD) $(ENABLE_GEOLOCATION) $(ENABLE_ICONDATABASE) $(ENABLE_INDEXED_DATABASE) $(ENABLE_INDEXED_DATABASE_IN_WORKERS) $(ENABLE_INPUT_TYPE_COLOR) $(ENABLE_INPUT_TYPE_DATE) $(ENABLE_INPUT_TYPE_DATETIME_INCOMPLETE) $(ENABLE_INPUT_TYPE_DATETIMELOCAL) $(ENABLE_INPUT_TYPE_MONTH) $(ENABLE_INPUT_TYPE_TIME) $(ENABLE_INPUT_TYPE_WEEK) $(ENABLE_INTERSECTION_OBSERVER) $(ENABLE_INTL) $(ENABLE_IOS_GESTURE_EVENTS) $(ENABLE_IOS_TOUCH_EVENTS) $(ENABLE_JIT) $(ENABLE_KEYBOARD_CODE_ATTRIBUTE) $(ENABLE_KEYBOARD_KEY_ATTRIBUTE) $(ENABLE_LAYOUT_FORMATTING_CONTEXT) $(ENABLE_LEGACY_CSS_VENDOR_PREFIXES) $(ENABLE_LEGACY_CUSTOM_PROTOCOL_MANAGER) $(ENABLE_LEGACY_ENCRYPTED_MEDIA) $(ENABLE_LETTERPRESS) $(ENABLE_MAC_GESTURE_EVENTS) $(ENABLE_MAC_VIDEO_TOOLBOX) $(ENABLE_MATHML) $(ENABLE_MEDIA_CAPTURE) $(ENABLE_MEDIA_CONTROLS_SCRIPT) $(ENABLE_MEDIA_SESSION) $(ENABLE_MEDIA_SOURCE) $(ENABLE_MEDIA_STATISTICS) $(ENABLE_MEDIA_STREAM) $(ENABLE_METER_ELEMENT) $(ENABLE_MHTML) $(ENABLE_MOUSE_CURSOR_SCALE) $(ENABLE_NAVIGATOR_CONTENT_UTILS) $(ENABLE_NAVIGATOR_STANDALONE) $(ENABLE_NOTIFICATIONS) $(ENABLE_PAYMENT_REQUEST) $(ENABLE_PDFKIT_PLUGIN) $(ENABLE_POINTER_EVENTS) $(ENABLE_POINTER_LOCK) $(ENABLE_PUBLIC_SUFFIX_LIST) $(ENABLE_QUOTA) $(ENABLE_REMOTE_INSPECTOR) $(ENABLE_RESOLUTION_MEDIA_QUERY) $(ENABLE_RESOURCE_LOAD_STATISTICS) $(ENABLE_RESOURCE_USAGE) $(ENABLE_RUBBER_BANDING) $(ENABLE_SERVICE_CONTROLS) $(ENABLE_SERVICE_WORKER) $(ENABLE_SPEECH_SYNTHESIS) $(ENABLE_STREAMS_API) $(ENABLE_WEB_CRYPTO) $(ENABLE_SVG_FONTS) $(ENABLE_TELEPHONE_NUMBER_DETECTION) $(ENABLE_TEXT_AUTOSIZING) $(ENABLE_TOUCH_EVENTS) $(ENABLE_USER_MESSAGE_HANDLERS) $(ENABLE_USERSELECT_ALL) $(ENABLE_VARIATION_FONTS) $(ENABLE_VIDEO) $(ENABLE_VIDEO_PRESENTATION_MODE) $(ENABLE_VIDEO_TRACK) $(ENABLE_VIDEO_USES_ELEMENT_FULLSCREEN) $(ENABLE_WEB_API_STATISTICS) $(ENABLE_WEB_AUDIO) $(ENABLE_WEB_AUTHN) $(ENABLE_WEB_RTC) $(ENABLE_WEBASSEMBLY) $(ENABLE_WEBASSEMBLY_STREAMING_API) $(ENABLE_WEBGL) $(ENABLE_WEBGL2) $(ENABLE_WEBGPU) $(ENABLE_WEBMETAL) $(ENABLE_WIRELESS_PLAYBACK_TARGET) $(ENABLE_XSLT);

Actions: View | Formatted Diff | Diff

Attachments on bug 193348: 358884 | 358885 | 358886 | 358896 | 358899 | 358900 | 359627 | 359628 | 359629 | 359634 | 359635 | 359637 | 359768 | 359863 | 359864 | 359879 | 359896 | 360093 | 360097 | 360161 | 360262 | 360263 | 360271