WebPageProxy.h   [plain text]

/*
 * Copyright (C) 2010-2020 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

#include "APIObject.h"
#include "Connection.h"
#include "ContentAsStringIncludesChildFrames.h"
#include "ContextMenuContextData.h"
#include "CreateNewGroupForHighlight.h"
#include "DataReference.h"
#include "DownloadID.h"
#include "DragControllerAction.h"
#include "EditingRange.h"
#include "EditorState.h"
#include "FocusedElementInformation.h"
#include "GeolocationIdentifier.h"
#include "GeolocationPermissionRequestManagerProxy.h"
#include "HiddenPageThrottlingAutoIncreasesCounter.h"
#include "LayerTreeContext.h"
#include "MediaPlaybackState.h"
#include "MessageSender.h"
#include "NotificationPermissionRequestManagerProxy.h"
#include "PDFPluginIdentifier.h"
#include "PageLoadState.h"
#include "PluginProcessAttributes.h"
#include "PolicyDecision.h"
#include "ProcessTerminationReason.h"
#include "ProcessThrottler.h"
#include "SandboxExtension.h"
#include "ShareableBitmap.h"
#include "ShareableResource.h"
#include "SpeechRecognitionPermissionRequest.h"
#include "SuspendedPageProxy.h"
#include "SyntheticEditingCommandType.h"
#include "SystemPreviewController.h"
#include "TransactionID.h"
#include "UserMediaPermissionRequestManagerProxy.h"
#include "VisibleContentRectUpdateInfo.h"
#include "VisibleWebPageCounter.h"
#include "WKBase.h"
#include "WKPagePrivate.h"
#include "WebColorPicker.h"
#include "WebContextMenuItemData.h"
#include "WebCoreArgumentCoders.h"
#include "WebDataListSuggestionsDropdown.h"
#include "WebFrameProxy.h"
#include "WebPageCreationParameters.h"
#include "WebPageDiagnosticLoggingClient.h"
#include "WebPageInjectedBundleClient.h"
#include "WebPageProxyIdentifier.h"
#include "WebPageProxyMessagesReplies.h"
#include "WebPaymentCoordinatorProxy.h"
#include "WebPreferences.h"
#include "WebPopupMenuProxy.h"
#include "WebUndoStepID.h"
#include "WebsitePoliciesData.h"
#include <WebCore/ActivityState.h>
#include <WebCore/AutoplayEvent.h>
#include <WebCore/Color.h>
#include <WebCore/DiagnosticLoggingClient.h>
#include <WebCore/DictationContext.h>
#include <WebCore/DragActions.h>
#include <WebCore/EventTrackingRegions.h>
#include <WebCore/ExceptionDetails.h>
#include <WebCore/FontAttributes.h>
#include <WebCore/FrameLoaderTypes.h>
#include <WebCore/FrameView.h> // FIXME: Move LayoutViewportConstraint to its own file and stop including this.
#include <WebCore/GlobalFrameIdentifier.h>
#include <WebCore/InputMode.h>
#include <WebCore/LayoutPoint.h>
#include <WebCore/LayoutSize.h>
#include <WebCore/MediaPlaybackTargetContext.h>
#include <WebCore/MediaProducer.h>
#include <WebCore/PageIdentifier.h>
#include <WebCore/PlatformEvent.h>
#include <WebCore/PlatformScreen.h>
#include <WebCore/PlatformSpeechSynthesisUtterance.h>
#include <WebCore/PlatformSpeechSynthesizer.h>
#include <WebCore/PointerID.h>
#include <WebCore/RegistrableDomain.h>
#include <WebCore/RunJavaScriptParameters.h>
#include <WebCore/ScrollTypes.h>
#include <WebCore/SearchPopupMenu.h>
#include <WebCore/TextChecking.h>
#include <WebCore/TextGranularity.h>
#include <WebCore/TextManipulationController.h>
#include <WebCore/UserInterfaceLayoutDirection.h>
#include <WebCore/ViewportArguments.h>
#include <memory>
#include <wtf/CompletionHandler.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/Logger.h>
#include <wtf/MonotonicTime.h>
#include <wtf/Optional.h>
#include <wtf/ProcessID.h>
#include <wtf/Ref.h>
#include <wtf/RefPtr.h>
#include <wtf/RunLoop.h>
#include <wtf/URL.h>
#include <wtf/UniqueRef.h>
#include <wtf/Vector.h>
#include <wtf/text/WTFString.h>

#if PLATFORM(IOS_FAMILY)
#include "GestureTypes.h"
#include "WebAutocorrectionContext.h"
#include <WebCore/InspectorOverlay.h>
#endif

#if PLATFORM(MACCATALYST)
#include "EndowmentStateTracker.h"
#endif

OBJC_CLASS NSTextAlternatives;
OBJC_CLASS NSView;
OBJC_CLASS _WKRemoteObjectRegistry;

#if ENABLE(DRAG_SUPPORT)
#include <WebCore/DragActions.h>
#endif

#if ENABLE(TOUCH_EVENTS)
#include "NativeWebTouchEvent.h"
#endif

#if PLATFORM(COCOA)
#include "DynamicViewportSizeUpdate.h"
#include "RemoteLayerTreeNode.h"
#endif

#if HAVE(TOUCH_BAR)
#include "TouchBarMenuData.h"
#include "TouchBarMenuItemData.h"
#endif

#if PLATFORM(GTK)
#include "ArgumentCodersGtk.h"
#endif

#if ENABLE(WIRELESS_PLAYBACK_TARGET) && !PLATFORM(IOS_FAMILY)
#include <WebCore/MediaPlaybackTargetPicker.h>
#include <WebCore/WebMediaSessionManagerClient.h>
#endif

#if HAVE(APP_SSO)
#include "SOAuthorizationLoadPolicy.h"
#endif

#if ENABLE(ATTACHMENT_ELEMENT)
#include <WebCore/PromisedAttachmentInfo.h>
#endif

#if USE(DIRECT2D)
interface ID3D11Device1;
#endif

#if ENABLE(MEDIA_USAGE)
#include <WebCore/MediaSessionIdentifier.h>
#endif

namespace API {
class Attachment;
class ContentWorld;
class ContextMenuClient;
class FindClient;
class FindMatchesClient;
class FormClient;
class FullscreenClient;
class HistoryClient;
class IconLoadingClient;
class LoaderClient;
class Navigation;
class NavigationClient;
class PolicyClient;
class ResourceLoadClient;
class UIClient;
class URLRequest;
}

namespace Inspector {
enum class InspectorTargetType : uint8_t;
}

namespace IPC {
class Decoder;
class FormDataReference;
class SharedBufferCopy;
}
OBJC_CLASS NSFileWrapper;
OBJC_CLASS WKQLThumbnailLoadOperation;

namespace WebCore {
class AuthenticationChallenge;
class CertificateInfo;
class Cursor;
class DragData;
class FloatRect;
class FontAttributeChanges;
class FontChanges;
class GraphicsLayer;
class IntSize;
class ProtectionSpace;
class RunLoopObserver;
class SelectionData;
class SharedBuffer;
class TextIndicator;
class ValidationBubble;

enum class AutoplayEvent : uint8_t;
enum class DOMPasteAccessResponse : uint8_t;
enum class EventMakesGamepadsVisible : bool;
enum class LockBackForwardList : bool;
enum class HasInsecureContent : bool;
enum class MouseEventPolicy : uint8_t;
enum class NotificationDirection : uint8_t;
enum class RouteSharingPolicy : uint8_t;
enum class SelectionDirection : uint8_t;
enum class ShouldSample : bool;
enum class ShouldTreatAsContinuingLoad : bool;
enum class WritingDirection : uint8_t;

struct ApplicationManifest;
struct AttributedString;
struct BackForwardItemIdentifier;
struct CompositionHighlight;
struct ContactInfo;
struct ContactsRequestData;
struct ContentRuleListResults;
struct DataListSuggestionInformation;
struct DateTimeChooserParameters;
struct DictionaryPopupInfo;
struct DragItem;
struct ElementContext;
struct ExceptionDetails;
struct FileChooserSettings;
struct GlobalWindowIdentifier;
struct LinkIcon;
struct MediaStreamRequest;
struct MediaUsageInfo;
struct MockWebAuthenticationConfiguration;
struct PrewarmInformation;
struct SecurityOriginData;
struct ShareData;
struct SpeechRecognitionError;
struct TextAlternativeWithRange;
struct TextCheckingResult;
struct ViewportAttributes;
struct WindowFeatures;

template<typename> class RectEdges;
using FloatBoxExtent = RectEdges<float>;
}

#if PLATFORM(GTK)
typedef GtkWidget* PlatformViewWidget;
#endif

#if USE(LIBWPE)
struct wpe_view_backend;
#endif

#if PLATFORM(GTK) || PLATFORM(WPE)
typedef struct OpaqueJSContext* JSGlobalContextRef;
#endif

#if PLATFORM(WIN)
typedef HWND PlatformViewWidget;
#endif

namespace WebKit {
class AudioSessionRoutingArbitratorProxy;
class DrawingAreaProxy;
class GamepadData;
class MediaUsageManager;
class NativeWebGestureEvent;
class NativeWebKeyboardEvent;
class NativeWebMouseEvent;
class NativeWebWheelEvent;
class PageClient;
class ProvisionalPageProxy;
class RemoteLayerTreeHost;
class RemoteLayerTreeScrollingPerformanceData;
class RemoteLayerTreeTransaction;
class RemoteScrollingCoordinatorProxy;
class SecKeyProxyStore;
class SpeechRecognitionPermissionManager;
class UserData;
class ViewSnapshot;
class VisitedLinkStore;
class WebBackForwardList;
class WebBackForwardListItem;
class WebContextMenuProxy;
class WebEditCommandProxy;
class WebFullScreenManagerProxy;
class PlaybackSessionManagerProxy;
class UserMediaPermissionRequestProxy;
class VideoFullscreenManagerProxy;
class WebAuthenticatorCoordinatorProxy;
class WebBackForwardCache;
class WebDeviceOrientationUpdateProviderProxy;
class WebKeyboardEvent;
class WebMouseEvent;
class WebNavigationState;
class WebOpenPanelResultListenerProxy;
class WebPageDebuggable;
class WebPageGroup;
class WebPageInspectorController;
class WebProcessProxy;
class WebURLSchemeHandler;
class WebUserContentControllerProxy;
class WebViewDidMoveToWindowObserver;
class WebWheelEvent;
class WebWheelEventCoalescer;
class WebsiteDataStore;

struct WebBackForwardListCounts;
struct ColorSpaceData;
struct DataDetectionResult;
struct DocumentEditingContext;
struct DocumentEditingContextRequest;
struct EditingRange;
struct EditorState;
struct FrameTreeNodeData;
struct FocusedElementInformation;
struct FontInfo;
struct FrameInfoData;
struct InputMethodState;
struct InsertTextOptions;
struct InteractionInformationAtPosition;
struct InteractionInformationRequest;
struct LoadParameters;
struct NavigationActionData;
struct PlatformPopupMenuData;
struct PrintInfo;
struct PDFContextMenu;
struct ResourceLoadInfo;
struct WebAutocorrectionData;
struct WebHitTestResultData;
struct WebNavigationDataStore;
struct WebPopupItem;
struct WebSpeechSynthesisVoice;
struct URLSchemeTaskParameters;
struct UserMessage;

enum class CreateNewGroupForHighlight : bool;
enum class NegotiatedLegacyTLS : bool;
enum class ProcessSwapRequestedByClient : bool;
enum class UndoOrRedo : bool;
enum class WebContentMode : uint8_t;

typedef GenericCallback<API::Data*> DataCallback;
typedef GenericCallback<uint64_t> UnsignedCallback;
typedef GenericCallback<const String&> StringCallback;
typedef GenericCallback<bool> BoolCallback;

#if HAVE(VISIBILITY_PROPAGATION_VIEW)
using LayerHostingContextID = uint32_t;
#endif

#if PLATFORM(GTK)
typedef GenericCallback<API::Error*> PrintFinishedCallback;
#endif

#if ENABLE(TOUCH_EVENTS)
struct QueuedTouchEvents {
    QueuedTouchEvents(const NativeWebTouchEvent& event)
        : forwardedEvent(event)
    {
    }
    NativeWebTouchEvent forwardedEvent;
    Vector<NativeWebTouchEvent> deferredTouchEvents;
};
#endif

#if ENABLE(APPLICATION_MANIFEST)
typedef GenericCallback<const Optional<WebCore::ApplicationManifest>&> ApplicationManifestCallback;
#endif

#if PLATFORM(COCOA)
using DrawToPDFCallback = GenericCallback<const IPC::DataReference&>;
typedef GenericCallback<bool, bool, String, double, double, uint64_t> NowPlayingInfoCallback;
#endif

#if ENABLE(DATE_AND_TIME_INPUT_TYPES)
class WebDateTimePicker;
#endif

using SpellDocumentTag = int64_t;

class WebPageProxy : public API::ObjectImpl<API::Object::Type::Page>
#if ENABLE(INPUT_TYPE_COLOR)
    , public WebColorPicker::Client
#endif
#if ENABLE(WIRELESS_PLAYBACK_TARGET) && !PLATFORM(IOS_FAMILY)
    , public WebCore::WebMediaSessionManagerClient
#endif
#if ENABLE(APPLE_PAY)
    , public WebPaymentCoordinatorProxy::Client
#endif
    , public WebPopupMenuProxy::Client
    , public IPC::MessageReceiver
    , public IPC::MessageSender
#if ENABLE(SPEECH_SYNTHESIS)
    , public WebCore::PlatformSpeechSynthesisUtteranceClient
    , public WebCore::PlatformSpeechSynthesizerClient
#endif
#if PLATFORM(MACCATALYST)
    , public EndowmentStateTracker::Client
#else
    , public CanMakeWeakPtr<WebPageProxy>
#endif
    {
public:
    static Ref<WebPageProxy> create(PageClient&, WebProcessProxy&, Ref<API::PageConfiguration>&&);
    virtual ~WebPageProxy();

    static void forMostVisibleWebPageIfAny(PAL::SessionID, const WebCore::SecurityOriginData&, CompletionHandler<void(WebPageProxy*)>&&);

    const API::PageConfiguration& configuration() const;

    using Identifier = WebPageProxyIdentifier;

    Identifier identifier() const { return m_identifier; }
    WebCore::PageIdentifier webPageID() const { return m_webPageID; }

    PAL::SessionID sessionID() const;

    WebFrameProxy* mainFrame() const { return m_mainFrame.get(); }
    WebFrameProxy* focusedFrame() const { return m_focusedFrame.get(); }

    DrawingAreaProxy* drawingArea() const { return m_drawingArea.get(); }
    DrawingAreaProxy* provisionalDrawingArea() const;

    WebNavigationState& navigationState() { return *m_navigationState.get(); }

    WebsiteDataStore& websiteDataStore() { return m_websiteDataStore; }

    void addPreviouslyVisitedPath(const String&);

#if ENABLE(DATA_DETECTION)
    NSArray *dataDetectionResults() { return m_dataDetectionResults.get(); }
    void detectDataInAllFrames(WebCore::DataDetectorType, CompletionHandler<void(const DataDetectionResult&)>&&);
    void removeDataDetectedLinks(CompletionHandler<void(const DataDetectionResult&)>&&);
#endif
        
#if ENABLE(ASYNC_SCROLLING) && PLATFORM(COCOA)
    RemoteScrollingCoordinatorProxy* scrollingCoordinatorProxy() const { return m_scrollingCoordinatorProxy.get(); }
#endif

    WebBackForwardList& backForwardList() { return m_backForwardList; }

    bool addsVisitedLinks() const { return m_addsVisitedLinks; }
    void setAddsVisitedLinks(bool addsVisitedLinks) { m_addsVisitedLinks = addsVisitedLinks; }
    VisitedLinkStore& visitedLinkStore() { return m_visitedLinkStore; }

    void exitFullscreenImmediately();
    void fullscreenMayReturnToInline();
    void didEnterFullscreen();
    void didExitFullscreen();

    WebInspectorProxy* inspector() const;
    GeolocationPermissionRequestManagerProxy& geolocationPermissionRequestManager() { return m_geolocationPermissionRequestManager; }

    void resourceLoadDidSendRequest(ResourceLoadInfo&&, WebCore::ResourceRequest&&);
    void resourceLoadDidPerformHTTPRedirection(ResourceLoadInfo&&, WebCore::ResourceResponse&&, WebCore::ResourceRequest&&);
    void resourceLoadDidReceiveChallenge(ResourceLoadInfo&&, WebCore::AuthenticationChallenge&&);
    void resourceLoadDidReceiveResponse(ResourceLoadInfo&&, WebCore::ResourceResponse&&);
    void resourceLoadDidCompleteWithError(ResourceLoadInfo&&, WebCore::ResourceResponse&&, WebCore::ResourceError&&);

    void didChangeInspectorFrontendCount(unsigned count) { m_inspectorFrontendCount = count; }
    unsigned inspectorFrontendCount() const { return m_inspectorFrontendCount; }
    bool hasInspectorFrontend() const { return m_inspectorFrontendCount > 0; }

    bool isControlledByAutomation() const { return m_controlledByAutomation; }
    void setControlledByAutomation(bool);

    WebPageInspectorController& inspectorController() { return *m_inspectorController; }

#if PLATFORM(IOS_FAMILY)
    void showInspectorIndication();
    void hideInspectorIndication();
#endif

    void createInspectorTarget(const String& targetId, Inspector::InspectorTargetType);
    void destroyInspectorTarget(const String& targetId);
    void sendMessageToInspectorFrontend(const String& targetId, const String& message);

    void getAllFrames(CompletionHandler<void(FrameTreeNodeData&&)>&&);

#if ENABLE(REMOTE_INSPECTOR)
    void setIndicating(bool);
    bool allowsRemoteInspection() const;
    void setAllowsRemoteInspection(bool);
    String remoteInspectionNameOverride() const;
    void setRemoteInspectionNameOverride(const String&);
    void remoteInspectorInformationDidChange();
#endif

#if ENABLE(FULLSCREEN_API)
    WebFullScreenManagerProxy* fullScreenManager();

    API::FullscreenClient& fullscreenClient() const { return *m_fullscreenClient; }
    void setFullscreenClient(std::unique_ptr<API::FullscreenClient>&&);
#endif
#if ENABLE(VIDEO_PRESENTATION_MODE)
    PlaybackSessionManagerProxy* playbackSessionManager();
    VideoFullscreenManagerProxy* videoFullscreenManager();
    void setMockVideoPresentationModeEnabled(bool);
#endif

#if PLATFORM(IOS_FAMILY)
    bool allowsMediaDocumentInlinePlayback() const;
    void setAllowsMediaDocumentInlinePlayback(bool);

    void willOpenAppLink();
#endif

#if USE(SYSTEM_PREVIEW)
    SystemPreviewController* systemPreviewController() { return m_systemPreviewController.get(); }
    void systemPreviewActionTriggered(const WebCore::SystemPreviewInfo&, const String&);
#endif

#if ENABLE(CONTEXT_MENUS)
    API::ContextMenuClient& contextMenuClient() { return *m_contextMenuClient; }
    void setContextMenuClient(std::unique_ptr<API::ContextMenuClient>&&);
#endif
    API::FindClient& findClient() { return *m_findClient; }
    void setFindClient(std::unique_ptr<API::FindClient>&&);
    API::FindMatchesClient& findMatchesClient() { return *m_findMatchesClient; }
    void setFindMatchesClient(std::unique_ptr<API::FindMatchesClient>&&);
    API::DiagnosticLoggingClient* diagnosticLoggingClient() { return m_diagnosticLoggingClient.get(); }
    void setDiagnosticLoggingClient(std::unique_ptr<API::DiagnosticLoggingClient>&&);
    void setFormClient(std::unique_ptr<API::FormClient>&&);
    void setNavigationClient(UniqueRef<API::NavigationClient>&&);
    void setHistoryClient(UniqueRef<API::HistoryClient>&&);
    void setLoaderClient(std::unique_ptr<API::LoaderClient>&&);
    void setPolicyClient(std::unique_ptr<API::PolicyClient>&&);
    void setInjectedBundleClient(const WKPageInjectedBundleClientBase*);
    void setResourceLoadClient(std::unique_ptr<API::ResourceLoadClient>&&);

    API::UIClient& uiClient() { return *m_uiClient; }
    void setUIClient(std::unique_ptr<API::UIClient>&&);

    API::IconLoadingClient& iconLoadingClient() { return *m_iconLoadingClient; }
    void setIconLoadingClient(std::unique_ptr<API::IconLoadingClient>&&);

    void setPageLoadStateObserver(std::unique_ptr<PageLoadState::Observer>&&);

    void initializeWebPage();
    void setDrawingArea(std::unique_ptr<DrawingAreaProxy>&&);

    WeakPtr<SecKeyProxyStore> secKeyProxyStore(const WebCore::AuthenticationChallenge&);
        
    void close();
    bool tryClose();
    bool isClosed() const { return m_isClosed; }

    void setOpenedByDOM() { m_openedByDOM = true; }
    bool openedByDOM() const { return m_openedByDOM; }

    bool hasCommittedAnyProvisionalLoads() const { return m_hasCommittedAnyProvisionalLoads; }

    bool preferFasterClickOverDoubleTap() const { return m_preferFasterClickOverDoubleTap; }

    void setIsUsingHighPerformanceWebGL(bool value) { m_isUsingHighPerformanceWebGL = value; }
    bool isUsingHighPerformanceWebGL() const { return m_isUsingHighPerformanceWebGL; }

    void didExceedInactiveMemoryLimitWhileActive();
    void didExceedBackgroundCPULimitWhileInForeground();

    void closePage();

    void addPlatformLoadParameters(WebProcessProxy&, LoadParameters&);
    RefPtr<API::Navigation> loadRequest(WebCore::ResourceRequest&&, WebCore::ShouldOpenExternalURLsPolicy = WebCore::ShouldOpenExternalURLsPolicy::ShouldAllowExternalSchemesButNotAppLinks, API::Object* userData = nullptr);
    RefPtr<API::Navigation> loadFile(const String& fileURL, const String& resourceDirectoryURL, API::Object* userData = nullptr);
    RefPtr<API::Navigation> loadData(const IPC::DataReference&, const String& MIMEType, const String& encoding, const String& baseURL, API::Object* userData = nullptr, WebCore::ShouldOpenExternalURLsPolicy = WebCore::ShouldOpenExternalURLsPolicy::ShouldNotAllow);
    void loadAlternateHTML(const IPC::DataReference&, const String& encoding, const URL& baseURL, const URL& unreachableURL, API::Object* userData = nullptr);
    void loadWebArchiveData(API::Data*, API::Object* userData = nullptr);
    void navigateToPDFLinkWithSimulatedClick(const String& url, WebCore::IntPoint documentPoint, WebCore::IntPoint screenPoint);

    void simulateDeviceOrientationChange(double alpha, double beta, double gamma);

    void stopLoading();
    RefPtr<API::Navigation> reload(OptionSet<WebCore::ReloadOption>);

    RefPtr<API::Navigation> goForward();
    RefPtr<API::Navigation> goBack();

    RefPtr<API::Navigation> goToBackForwardItem(WebBackForwardListItem&);
    void tryRestoreScrollPosition();
    void didChangeBackForwardList(WebBackForwardListItem* addedItem, Vector<Ref<WebBackForwardListItem>>&& removed);
    void willGoToBackForwardListItem(const WebCore::BackForwardItemIdentifier&, bool inBackForwardCache);

    bool shouldKeepCurrentBackForwardListItemInList(WebBackForwardListItem&);

    bool willHandleHorizontalScrollEvents() const;

    void updateWebsitePolicies(WebsitePoliciesData&&);
    void notifyUserScripts();
    bool userScriptsNeedNotification() const;

    bool canShowMIMEType(const String& mimeType);

    String currentURL() const;

    float topContentInset() const { return m_topContentInset; }
    void setTopContentInset(float);

    WebCore::Color underlayColor() const { return m_underlayColor; }
    void setUnderlayColor(const WebCore::Color&);

    // At this time, m_pageExtendedBackgroundColor can be set via pageExtendedBackgroundColorDidChange() which is a message
    // from the UIProcess, or by didCommitLayerTree(). When PLATFORM(MAC) adopts UI side compositing, we should get rid of
    // the message entirely.
    WebCore::Color pageExtendedBackgroundColor() const { return m_pageExtendedBackgroundColor; }

    void viewWillStartLiveResize();
    void viewWillEndLiveResize();

    void setInitialFocus(bool forward, bool isKeyboardEventValid, const WebKeyboardEvent&, CompletionHandler<void()>&&);
    
    void clearSelection();
    void restoreSelectionInFocusedEditableElement();

    PageClient& pageClient() const;

    void setViewNeedsDisplay(const WebCore::Region&);
    void requestScroll(const WebCore::FloatPoint& scrollPosition, const WebCore::IntPoint& scrollOrigin);
    
    WebCore::FloatPoint viewScrollPosition() const;

    void setDelegatesScrolling(bool delegatesScrolling) { m_delegatesScrolling = delegatesScrolling; }
    bool delegatesScrolling() const { return m_delegatesScrolling; }

    void setPrivateClickMeasurement(Optional<WebCore::PrivateClickMeasurement>&& measurement) { m_privateClickMeasurement = WTFMove(measurement); }
    const Optional<WebCore::PrivateClickMeasurement>& privateClickMeasurement() const { return m_privateClickMeasurement; }

    enum class ActivityStateChangeDispatchMode : bool { Deferrable, Immediate };
    enum class ActivityStateChangeReplyMode : bool { Asynchronous, Synchronous };
    void activityStateDidChange(OptionSet<WebCore::ActivityState::Flag> mayHaveChanged, ActivityStateChangeDispatchMode = ActivityStateChangeDispatchMode::Deferrable, ActivityStateChangeReplyMode = ActivityStateChangeReplyMode::Asynchronous);
    bool isInWindow() const { return m_activityState.contains(WebCore::ActivityState::IsInWindow); }
    void waitForDidUpdateActivityState(ActivityStateChangeID);
    void didUpdateActivityState() { m_waitingForDidUpdateActivityState = false; }

    void layerHostingModeDidChange();

    WebCore::IntSize viewSize() const;
    bool isViewVisible() const { return m_activityState.contains(WebCore::ActivityState::IsVisible); }
    bool isViewFocused() const { return m_activityState.contains(WebCore::ActivityState::IsFocused); }
    bool isViewWindowActive() const { return m_activityState.contains(WebCore::ActivityState::WindowIsActive); }

    void addMIMETypeWithCustomContentProvider(const String& mimeType);

    void selectAll();
    void executeEditCommand(const String& commandName, const String& argument = String());
    void executeEditCommand(const String& commandName, const String& argument, CompletionHandler<void()>&&);
    void validateCommand(const String& commandName, CompletionHandler<void(bool, int32_t)>&&);

    const EditorState& editorState() const { return m_editorState; }
    bool canDelete() const { return hasSelectedRange() && isContentEditable(); }
    bool hasSelectedRange() const { return m_editorState.selectionIsRange; }
    bool isContentEditable() const { return m_editorState.isContentEditable; }

    void increaseListLevel();
    void decreaseListLevel();
    void changeListType();

    void setBaseWritingDirection(WebCore::WritingDirection);

    Optional<WebCore::FontAttributes> cachedFontAttributesAtSelectionStart() const { return m_cachedFontAttributesAtSelectionStart; }

#if HAVE(TOUCH_BAR)
    const TouchBarMenuData& touchBarMenuData() const { return m_touchBarMenuData; }
#endif

    bool maintainsInactiveSelection() const;
    void setMaintainsInactiveSelection(bool);
    void setEditable(bool);
    bool isEditable() const { return m_isEditable; }

    void activateMediaStreamCaptureInPage();
    bool isMediaStreamCaptureMuted() const { return m_mutedState & WebCore::MediaProducer::MediaStreamCaptureIsMuted; }
    void setMediaStreamCaptureMuted(bool);

    void requestFontAttributesAtSelectionStart(CompletionHandler<void(const WebCore::FontAttributes&)>&&);

    void setCanShowPlaceholder(const WebCore::ElementContext&, bool);

#if ENABLE(UI_SIDE_COMPOSITING)
    void updateVisibleContentRects(const VisibleContentRectUpdateInfo&, bool sendEvenIfUnchanged);
#endif

#if PLATFORM(IOS_FAMILY)
    void textInputContextsInRect(WebCore::FloatRect, CompletionHandler<void(const Vector<WebCore::ElementContext>&)>&&);
    void focusTextInputContextAndPlaceCaret(const WebCore::ElementContext&, const WebCore::IntPoint&, CompletionHandler<void(bool)>&&);

    void setShouldRevealCurrentSelectionAfterInsertion(bool);
        
    void setScreenIsBeingCaptured(bool);

    void insertTextPlaceholder(const WebCore::IntSize&, CompletionHandler<void(const Optional<WebCore::ElementContext>&)>&&);
    void removeTextPlaceholder(const WebCore::ElementContext&, CompletionHandler<void()>&&);

    double displayedContentScale() const { return m_lastVisibleContentRectUpdate.scale(); }
    const WebCore::FloatRect& exposedContentRect() const { return m_lastVisibleContentRectUpdate.exposedContentRect(); }
    const WebCore::FloatRect& unobscuredContentRect() const { return m_lastVisibleContentRectUpdate.unobscuredContentRect(); }
    bool inStableState() const { return m_lastVisibleContentRectUpdate.inStableState(); }
    const WebCore::FloatRect& unobscuredContentRectRespectingInputViewBounds() const { return m_lastVisibleContentRectUpdate.unobscuredContentRectRespectingInputViewBounds(); }
    // When visual viewports are enabled, this is the layout viewport rect.
    const WebCore::FloatRect& layoutViewportRect() const { return m_lastVisibleContentRectUpdate.layoutViewportRect(); }

    void resendLastVisibleContentRects();

    WebCore::FloatRect computeLayoutViewportRect(const WebCore::FloatRect& unobscuredContentRect, const WebCore::FloatRect& unobscuredContentRectRespectingInputViewBounds, const WebCore::FloatRect& currentLayoutViewportRect, double displayedContentScale, WebCore::FrameView::LayoutViewportConstraint = WebCore::FrameView::LayoutViewportConstraint::Unconstrained) const;

    WebCore::FloatRect unconstrainedLayoutViewportRect() const;
    void adjustLayersForLayoutViewport(const WebCore::FloatRect& layoutViewport);

    void scrollingNodeScrollViewWillStartPanGesture();
    void scrollingNodeScrollViewDidScroll();
    void scrollingNodeScrollWillStartScroll();
    void scrollingNodeScrollDidEndScroll();

    void dynamicViewportSizeUpdate(const WebCore::FloatSize& viewLayoutSize, const WebCore::FloatSize& maximumUnobscuredSize, const WebCore::FloatRect& targetExposedContentRect, const WebCore::FloatRect& targetUnobscuredRect, const WebCore::FloatRect& targetUnobscuredRectInScrollViewCoordinates, const WebCore::FloatBoxExtent& unobscuredSafeAreaInsets, double targetScale, int32_t deviceOrientation, double minimumEffectiveDeviceWidth, DynamicViewportSizeUpdateID);

    void setViewportConfigurationViewLayoutSize(const WebCore::FloatSize&, double scaleFactor, double minimumEffectiveDeviceWidth);
    void setMaximumUnobscuredSize(const WebCore::FloatSize&);
    WebCore::FloatSize maximumUnobscuredSize() const { return m_maximumUnobscuredSize; }
    void setDeviceOrientation(int32_t);
    int32_t deviceOrientation() const { return m_deviceOrientation; }
    void setOverrideViewportArguments(const Optional<WebCore::ViewportArguments>&);
    void willCommitLayerTree(TransactionID);

    void selectWithGesture(const WebCore::IntPoint, GestureType, GestureRecognizerState, bool isInteractingWithFocusedElement, CompletionHandler<void(const WebCore::IntPoint&, GestureType, GestureRecognizerState, OptionSet<SelectionFlags>)>&&);
    void updateSelectionWithTouches(const WebCore::IntPoint, SelectionTouch, bool baseIsStart, CompletionHandler<void(const WebCore::IntPoint&, SelectionTouch, OptionSet<SelectionFlags>)>&&);
    void selectWithTwoTouches(const WebCore::IntPoint from, const WebCore::IntPoint to, GestureType, GestureRecognizerState, CompletionHandler<void(const WebCore::IntPoint&, GestureType, GestureRecognizerState, OptionSet<SelectionFlags>)>&&);
    void extendSelection(WebCore::TextGranularity, CompletionHandler<void()>&& = { });
    void selectWordBackward();
    void moveSelectionByOffset(int32_t offset, CompletionHandler<void()>&&);
    void selectTextWithGranularityAtPoint(const WebCore::IntPoint, WebCore::TextGranularity, bool isInteractingWithFocusedElement, CompletionHandler<void()>&&);
    void selectPositionAtPoint(const WebCore::IntPoint, bool isInteractingWithFocusedElement, CompletionHandler<void()>&&);
    void selectPositionAtBoundaryWithDirection(const WebCore::IntPoint, WebCore::TextGranularity, WebCore::SelectionDirection, bool isInteractingWithFocusedElement, CompletionHandler<void()>&&);
    void moveSelectionAtBoundaryWithDirection(WebCore::TextGranularity, WebCore::SelectionDirection, CompletionHandler<void()>&&);
    void beginSelectionInDirection(WebCore::SelectionDirection, WTF::Function<void (uint64_t, CallbackBase::Error)>&&);
    void updateSelectionWithExtentPoint(const WebCore::IntPoint, bool isInteractingWithFocusedElement, RespectSelectionAnchor, WTF::Function<void(uint64_t, CallbackBase::Error)>&&);
    void updateSelectionWithExtentPointAndBoundary(const WebCore::IntPoint, WebCore::TextGranularity, bool isInteractingWithFocusedElement, WTF::Function<void(uint64_t, CallbackBase::Error)>&&);
    void requestAutocorrectionData(const String& textForAutocorrection, CompletionHandler<void(WebAutocorrectionData)>&&);
    void applyAutocorrection(const String& correction, const String& originalText, WTF::Function<void (const String&, CallbackBase::Error)>&&);
    bool applyAutocorrection(const String& correction, const String& originalText);
    void requestAutocorrectionContext();
    void handleAutocorrectionContext(const WebAutocorrectionContext&);
    void requestDictationContext(CompletionHandler<void(const String&, const String&, const String&)>&&);
    void replaceDictatedText(const String& oldText, const String& newText);
    void replaceSelectedText(const String& oldText, const String& newText);
    void didReceivePositionInformation(const InteractionInformationAtPosition&);
    void requestPositionInformation(const InteractionInformationRequest&);
    void startInteractionWithPositionInformation(const InteractionInformationAtPosition&);
    void stopInteraction();
    void performActionOnElement(uint32_t action);
    void saveImageToLibrary(const SharedMemory::IPCHandle& imageHandle);
    void focusNextFocusedElement(bool isForward, CompletionHandler<void()>&& = [] { });
    void setFocusedElementValue(const String&);
    void setFocusedElementValueAsNumber(double);
    void setFocusedElementSelectedIndex(uint32_t index, bool allowMultipleSelection = false);
    void applicationDidEnterBackground();
    void applicationDidFinishSnapshottingAfterEnteringBackground();
    void applicationWillEnterForeground();
    bool lastObservedStateWasBackground() const { return m_lastObservedStateWasBackground; }
    void applicationWillResignActive();
    void applicationDidBecomeActive();
    void applicationDidEnterBackgroundForMedia();
    void applicationWillEnterForegroundForMedia();
    void commitPotentialTapFailed();
    void didNotHandleTapAsClick(const WebCore::IntPoint&);
    void didCompleteSyntheticClick();
    void disableDoubleTapGesturesDuringTapIfNecessary(uint64_t requestID);
    void handleSmartMagnificationInformationForPotentialTap(uint64_t requestID, const WebCore::FloatRect& renderRect, bool fitEntireRect, double viewportMinimumScale, double viewportMaximumScale, bool nodeIsRootLevel);
    void contentSizeCategoryDidChange(const String& contentSizeCategory);
    void getSelectionContext(CompletionHandler<void(const String&, const String&, const String&)>&&);
    void handleTwoFingerTapAtPoint(const WebCore::IntPoint&, OptionSet<WebKit::WebEvent::Modifier>, uint64_t requestID);
    void setForceAlwaysUserScalable(bool);
    bool forceAlwaysUserScalable() const { return m_forceAlwaysUserScalable; }
    double layoutSizeScaleFactor() const { return m_viewportConfigurationLayoutSizeScaleFactor; }
    WebCore::FloatSize viewLayoutSize() const { return m_viewportConfigurationViewLayoutSize; }
    double minimumEffectiveDeviceWidth() const { return m_viewportConfigurationMinimumEffectiveDeviceWidth; }
    void setMinimumEffectiveDeviceWidthWithoutViewportConfigurationUpdate(double minimumEffectiveDeviceWidth) { m_viewportConfigurationMinimumEffectiveDeviceWidth = minimumEffectiveDeviceWidth; }
    void setIsScrollingOrZooming(bool);
    void requestRectsForGranularityWithSelectionOffset(WebCore::TextGranularity, uint32_t offset, CompletionHandler<void(const Vector<WebCore::SelectionRect>&)>&&);
    void requestRectsAtSelectionOffsetWithText(int32_t offset, const String&, CompletionHandler<void(const Vector<WebCore::SelectionRect>&)>&&);
    void autofillLoginCredentials(const String& username, const String& password);
    void storeSelectionForAccessibility(bool);
    void startAutoscrollAtPosition(const WebCore::FloatPoint& positionInWindow);
    void cancelAutoscroll();
    void hardwareKeyboardAvailabilityChanged(bool keyboardIsAttached);
    bool isScrollingOrZooming() const { return m_isScrollingOrZooming; }
    void requestEvasionRectsAboveSelection(CompletionHandler<void(const Vector<WebCore::FloatRect>&)>&&);
    void updateSelectionWithDelta(int64_t locationDelta, int64_t lengthDelta, CompletionHandler<void()>&&);
    WebCore::FloatRect selectionBoundingRectInRootViewCoordinates() const;
    void requestDocumentEditingContext(WebKit::DocumentEditingContextRequest, CompletionHandler<void(WebKit::DocumentEditingContext)>&&);
    void generateSyntheticEditingCommand(SyntheticEditingCommandType);
    void showDataDetectorsUIForPositionInformation(const InteractionInformationAtPosition&);
#if ENABLE(DRAG_SUPPORT)
    void didHandleDragStartRequest(bool started);
    void didHandleAdditionalDragItemsRequest(bool added);
    void requestDragStart(const WebCore::IntPoint& clientPosition, const WebCore::IntPoint& globalPosition, OptionSet<WebCore::DragSourceAction> allowedActionsMask);
    void requestAdditionalItemsForDragSession(const WebCore::IntPoint& clientPosition, const WebCore::IntPoint& globalPosition, OptionSet<WebCore::DragSourceAction> allowedActionsMask);
    void insertDroppedImagePlaceholders(const Vector<WebCore::IntSize>&, CompletionHandler<void(const Vector<WebCore::IntRect>&, Optional<WebCore::TextIndicatorData>)>&& reply);
    void willReceiveEditDragSnapshot();
    void didReceiveEditDragSnapshot(Optional<WebCore::TextIndicatorData>);
    void didConcludeDrop();
#endif
#endif // PLATFORM(IOS_FAMILY)
#if ENABLE(DATA_DETECTION)
    void setDataDetectionResult(const DataDetectionResult&);
#endif
    void didCommitLayerTree(const WebKit::RemoteLayerTreeTransaction&);
    void layerTreeCommitComplete();

    bool updateLayoutViewportParameters(const WebKit::RemoteLayerTreeTransaction&);

#if PLATFORM(GTK) || PLATFORM(WPE)
    void cancelComposition(const String& compositionString);
    void deleteSurrounding(int64_t offset, unsigned characterCount);

    void setInputMethodState(Optional<InputMethodState>&&);
#endif

#if PLATFORM(GTK)
    void getCenterForZoomGesture(const WebCore::IntPoint& centerInViewCoordinates, WebCore::IntPoint& center);
#endif

#if PLATFORM(COCOA)
    void windowAndViewFramesChanged(const WebCore::FloatRect& viewFrameInWindowCoordinates, const WebCore::FloatPoint& accessibilityViewCoordinates);
    void setMainFrameIsScrollable(bool);

    void sendComplexTextInputToPlugin(uint64_t pluginComplexTextInputIdentifier, const String& textInput);
    bool shouldDelayWindowOrderingForEvent(const WebMouseEvent&);
    bool acceptsFirstMouse(int eventNumber, const WebMouseEvent&);

    void setRemoteLayerTreeRootNode(RemoteLayerTreeNode*);
    CALayer *acceleratedCompositingRootLayer() const;

    void setTextAsync(const String&);

    void insertTextAsync(const String&, const EditingRange& replacementRange, InsertTextOptions&&);
    void insertDictatedTextAsync(const String&, const EditingRange& replacementRange, const Vector<WebCore::TextAlternativeWithRange>&, InsertTextOptions&&);

#if USE(DICTATION_ALTERNATIVES)
    NSTextAlternatives *platformDictationAlternatives(WebCore::DictationContext);
#endif

    void hasMarkedText(CompletionHandler<void(bool)>&&);
    void getMarkedRangeAsync(CompletionHandler<void(const EditingRange&)>&&);
    void getSelectedRangeAsync(CompletionHandler<void(const EditingRange&)>&&);
    void characterIndexForPointAsync(const WebCore::IntPoint&, WTF::Function<void (uint64_t, CallbackBase::Error)>&&);
    void firstRectForCharacterRangeAsync(const EditingRange&, CompletionHandler<void(const WebCore::IntRect&, const EditingRange&)>&&);
    void setCompositionAsync(const String& text, const Vector<WebCore::CompositionUnderline>&, const Vector<WebCore::CompositionHighlight>&, const EditingRange& selectionRange, const EditingRange& replacementRange);
    void confirmCompositionAsync();

    void setScrollPerformanceDataCollectionEnabled(bool);
    bool scrollPerformanceDataCollectionEnabled() const { return m_scrollPerformanceDataCollectionEnabled; }
    RemoteLayerTreeScrollingPerformanceData* scrollingPerformanceData() { return m_scrollingPerformanceData.get(); }

    void scheduleActivityStateUpdate();
    void addActivityStateUpdateCompletionHandler(CompletionHandler<void()>&&);
#endif // PLATFORM(COCOA)

    void dispatchActivityStateUpdateForTesting();

    void changeFontAttributes(WebCore::FontAttributeChanges&&);
    void changeFont(WebCore::FontChanges&&);

#if PLATFORM(MAC)
    void attributedSubstringForCharacterRangeAsync(const EditingRange&, CompletionHandler<void(const WebCore::AttributedString&, const EditingRange&)>&&);
    void fontAtSelection(CompletionHandler<void(const FontInfo&, double, bool)>&&);

    void startWindowDrag();
    NSWindow *platformWindow();
    void rootViewToWindow(const WebCore::IntRect& viewRect, WebCore::IntRect& windowRect);

    NSView *inspectorAttachmentView();
    _WKRemoteObjectRegistry *remoteObjectRegistry();

    CGRect boundsOfLayerInLayerBackedWindowCoordinates(CALayer *) const;
#endif // PLATFORM(MAC)

#if PLATFORM(GTK)
    PlatformViewWidget viewWidget();
    bool makeGLContextCurrent();
    void themeDidChange();
#endif

    const Optional<WebCore::Color>& backgroundColor() const { return m_backgroundColor; }
    void setBackgroundColor(const Optional<WebCore::Color>&);

#if PLATFORM(WIN)
    PlatformViewWidget viewWidget();
#if USE(DIRECT2D)
    ID3D11Device1* device() const;
    void setDevice(ID3D11Device1*);
#endif
#endif
#if USE(LIBWPE)
    struct wpe_view_backend* viewBackend();
#endif

    bool isProcessingMouseEvents() const;
    void processNextQueuedMouseEvent();
    void handleMouseEvent(const NativeWebMouseEvent&);

    void doAfterProcessingAllPendingMouseEvents(WTF::Function<void ()>&&);
    void didFinishProcessingAllPendingMouseEvents();
    void flushPendingMouseEventCallbacks();

    bool isProcessingWheelEvents() const;
    void handleWheelEvent(const NativeWebWheelEvent&);

    bool isProcessingKeyboardEvents() const;
    bool handleKeyboardEvent(const NativeWebKeyboardEvent&);
#if PLATFORM(WIN)
    void dispatchPendingCharEvents(const NativeWebKeyboardEvent&);
#endif

#if ENABLE(MAC_GESTURE_EVENTS)
    void handleGestureEvent(const NativeWebGestureEvent&);
#endif

#if ENABLE(IOS_TOUCH_EVENTS)
    void resetPotentialTapSecurityOrigin();
    void handlePreventableTouchEvent(NativeWebTouchEvent&);
    void handleUnpreventableTouchEvent(const NativeWebTouchEvent&);

#elif ENABLE(TOUCH_EVENTS)
    void handleTouchEvent(const NativeWebTouchEvent&);
#endif

    void cancelPointer(WebCore::PointerID, const WebCore::IntPoint&);
    void touchWithIdentifierWasRemoved(WebCore::PointerID);

    void scrollBy(WebCore::ScrollDirection, WebCore::ScrollGranularity);
    void centerSelectionInVisibleArea();

    const String& toolTip() const { return m_toolTip; }

    const String& userAgent() const { return m_userAgent; }
    String userAgentForURL(const URL&);
    void setApplicationNameForUserAgent(const String&);
    const String& applicationNameForUserAgent() const { return m_applicationNameForUserAgent; }
    void setApplicationNameForDesktopUserAgent(const String& applicationName) { m_applicationNameForDesktopUserAgent = applicationName; }
    const String& applicationNameForDesktopUserAgent() const { return m_applicationNameForDesktopUserAgent; }
    void setCustomUserAgent(const String&);
    const String& customUserAgent() const { return m_customUserAgent; }
    static String standardUserAgent(const String& applicationName = String());

    bool supportsTextEncoding() const;
    void setCustomTextEncodingName(const String&);
    String customTextEncodingName() const { return m_customTextEncodingName; }

    bool areActiveDOMObjectsAndAnimationsSuspended() const { return m_isPageSuspended; }
    void resumeActiveDOMObjectsAndAnimations();
    void suspendActiveDOMObjectsAndAnimations();

    double estimatedProgress() const;

    SessionState sessionState(WTF::Function<bool (WebBackForwardListItem&)>&& = nullptr) const;
    RefPtr<API::Navigation> restoreFromSessionState(SessionState, bool navigate);

    bool supportsTextZoom() const;
    double textZoomFactor() const { return m_textZoomFactor; }
    void setTextZoomFactor(double);
    double pageZoomFactor() const;
    void setPageZoomFactor(double);
    void setPageAndTextZoomFactors(double pageZoomFactor, double textZoomFactor);

    void scalePage(double scale, const WebCore::IntPoint& origin);
    void scalePageInViewCoordinates(double scale, const WebCore::IntPoint& centerInViewCoordinates);
    double pageScaleFactor() const;
    double viewScaleFactor() const { return m_viewScaleFactor; }
    void scaleView(double scale);
    void setShouldScaleViewToFitDocument(bool);
    
    float deviceScaleFactor() const;
    void setIntrinsicDeviceScaleFactor(float);
    void setCustomDeviceScaleFactor(float);
    void windowScreenDidChange(WebCore::PlatformDisplayID, Optional<unsigned> nominalFramesPerSecond);
    void accessibilitySettingsDidChange();

    void setUseFixedLayout(bool);
    void setFixedLayoutSize(const WebCore::IntSize&);
    bool useFixedLayout() const { return m_useFixedLayout; };
    const WebCore::IntSize& fixedLayoutSize() const { return m_fixedLayoutSize; };

    void setViewExposedRect(Optional<WebCore::FloatRect>);
    Optional<WebCore::FloatRect> viewExposedRect() const { return m_viewExposedRect; }

    void setAlwaysShowsHorizontalScroller(bool);
    void setAlwaysShowsVerticalScroller(bool);
    bool alwaysShowsHorizontalScroller() const { return m_alwaysShowsHorizontalScroller; }
    bool alwaysShowsVerticalScroller() const { return m_alwaysShowsVerticalScroller; }

    void listenForLayoutMilestones(OptionSet<WebCore::LayoutMilestone>);

    bool hasHorizontalScrollbar() const { return m_mainFrameHasHorizontalScrollbar; }
    bool hasVerticalScrollbar() const { return m_mainFrameHasVerticalScrollbar; }

    void setSuppressScrollbarAnimations(bool);
    bool areScrollbarAnimationsSuppressed() const { return m_suppressScrollbarAnimations; }

    bool isPinnedToLeftSide() const { return m_mainFrameIsPinnedToLeftSide; }
    bool isPinnedToRightSide() const { return m_mainFrameIsPinnedToRightSide; }
    bool isPinnedToTopSide() const { return m_mainFrameIsPinnedToTopSide; }
    bool isPinnedToBottomSide() const { return m_mainFrameIsPinnedToBottomSide; }

    bool rubberBandsAtLeft() const;
    void setRubberBandsAtLeft(bool);
    bool rubberBandsAtRight() const;
    void setRubberBandsAtRight(bool);
    bool rubberBandsAtTop() const;
    void setRubberBandsAtTop(bool);
    bool rubberBandsAtBottom() const;
    void setRubberBandsAtBottom(bool);

    void setShouldUseImplicitRubberBandControl(bool shouldUseImplicitRubberBandControl) { m_shouldUseImplicitRubberBandControl = shouldUseImplicitRubberBandControl; }
    bool shouldUseImplicitRubberBandControl() const { return m_shouldUseImplicitRubberBandControl; }
        
    void setEnableVerticalRubberBanding(bool);
    bool verticalRubberBandingIsEnabled() const;
    void setEnableHorizontalRubberBanding(bool);
    bool horizontalRubberBandingIsEnabled() const;
        
    void setBackgroundExtendsBeyondPage(bool);
    bool backgroundExtendsBeyondPage() const;

    void setPaginationMode(WebCore::Pagination::Mode);
    WebCore::Pagination::Mode paginationMode() const { return m_paginationMode; }
    void setPaginationBehavesLikeColumns(bool);
    bool paginationBehavesLikeColumns() const { return m_paginationBehavesLikeColumns; }
    void setPageLength(double);
    double pageLength() const { return m_pageLength; }
    void setGapBetweenPages(double);
    double gapBetweenPages() const { return m_gapBetweenPages; }
    void setPaginationLineGridEnabled(bool);
    bool paginationLineGridEnabled() const { return m_paginationLineGridEnabled; }
    unsigned pageCount() const { return m_pageCount; }

    void isJITEnabled(CompletionHandler<void(bool)>&&);

#if PLATFORM(MAC)
    void setUseSystemAppearance(bool);
    bool useSystemAppearance() const { return m_useSystemAppearance; }
#endif

    void effectiveAppearanceDidChange();
    bool useDarkAppearance() const;
    bool useElevatedUserInterfaceLevel() const;

#if PLATFORM(COCOA)
    // Called by the web process through a message.
    void registerWebProcessAccessibilityToken(const IPC::DataReference&);
    // Called by the UI process when it is ready to send its tokens to the web process.
    void registerUIProcessAccessibilityTokens(const IPC::DataReference& elemenToken, const IPC::DataReference& windowToken);
    bool readSelectionFromPasteboard(const String& pasteboardName);
    String stringSelectionForPasteboard();
    RefPtr<WebCore::SharedBuffer> dataSelectionForPasteboard(const String& pasteboardType);
    void makeFirstResponder();
    void assistiveTechnologyMakeFirstResponder();

    ColorSpaceData colorSpace();
#endif

#if ENABLE(SERVICE_CONTROLS)
    void replaceSelectionWithPasteboardData(const Vector<String>& types, const IPC::DataReference&);
#endif

    void pageScaleFactorDidChange(double);
    void pluginScaleFactorDidChange(double);
    void pluginZoomFactorDidChange(double);

    // Find.
    void findString(const String&, OptionSet<FindOptions>, unsigned maxMatchCount, CompletionHandler<void(bool)>&& = [](bool) { });
    void findStringMatches(const String&, OptionSet<FindOptions>, unsigned maxMatchCount);
    void getImageForFindMatch(int32_t matchIndex);
    void selectFindMatch(int32_t matchIndex);
    void indicateFindMatch(int32_t matchIndex);
    void didGetImageForFindMatch(const ShareableBitmap::Handle& contentImageHandle, uint32_t matchIndex);
    void hideFindUI();
    void countStringMatches(const String&, OptionSet<FindOptions>, unsigned maxMatchCount);
    void replaceMatches(Vector<uint32_t>&& matchIndices, const String& replacementText, bool selectionOnly, Function<void(uint64_t, CallbackBase::Error)>&&);
    void didCountStringMatches(const String&, uint32_t matchCount);
    void setTextIndicator(const WebCore::TextIndicatorData&, uint64_t /* WebCore::TextIndicatorWindowLifetime */ lifetime = 0 /* Permanent */);
    void setTextIndicatorAnimationProgress(float);
    void clearTextIndicator();

    void didFindString(const String&, const Vector<WebCore::IntRect>&, uint32_t matchCount, int32_t matchIndex, bool didWrapAround);
    void didFailToFindString(const String&);
    void didFindStringMatches(const String&, const Vector<Vector<WebCore::IntRect>>& matchRects, int32_t firstIndexAfterSelection);

    void getContentsAsString(ContentAsStringIncludesChildFrames, WTF::Function<void(const String&, CallbackBase::Error)>&&);
#if PLATFORM(COCOA)
    void getContentsAsAttributedString(CompletionHandler<void(const WebCore::AttributedString&)>&&);
#endif
    void getBytecodeProfile(WTF::Function<void (const String&, CallbackBase::Error)>&&);
    void getSamplingProfilerOutput(WTF::Function<void (const String&, CallbackBase::Error)>&&);

#if ENABLE(MHTML)
    void getContentsAsMHTMLData(Function<void (API::Data*, CallbackBase::Error)>&&);
#endif
    void getMainResourceDataOfFrame(WebFrameProxy*, Function<void (API::Data*, CallbackBase::Error)>&&);
    void getResourceDataFromFrame(WebFrameProxy*, API::URL*, Function<void (API::Data*, CallbackBase::Error)>&&);
    void getRenderTreeExternalRepresentation(WTF::Function<void (const String&, CallbackBase::Error)>&&);
    void getSelectionOrContentsAsString(WTF::Function<void (const String&, CallbackBase::Error)>&&);
    void getSelectionAsWebArchiveData(Function<void (API::Data*, CallbackBase::Error)>&&);
    void getSourceForFrame(WebFrameProxy*, WTF::Function<void (const String&, CallbackBase::Error)>&&);
    void getWebArchiveOfFrame(WebFrameProxy*, Function<void (API::Data*, CallbackBase::Error)>&&);
    void runJavaScriptInMainFrame(WebCore::RunJavaScriptParameters&&, CompletionHandler<void(Expected<RefPtr<API::SerializedScriptValue>, WebCore::ExceptionDetails>&&)>&&);
    void runJavaScriptInFrameInScriptWorld(WebCore::RunJavaScriptParameters&&, Optional<WebCore::FrameIdentifier>, API::ContentWorld&, CompletionHandler<void(Expected<RefPtr<API::SerializedScriptValue>, WebCore::ExceptionDetails>&&)>&&);
    void forceRepaint(CompletionHandler<void()>&&);

    float headerHeight(WebFrameProxy&);
    float footerHeight(WebFrameProxy&);
    void drawHeader(WebFrameProxy&, WebCore::FloatRect&&);
    void drawFooter(WebFrameProxy&, WebCore::FloatRect&&);

#if PLATFORM(COCOA)
    // Dictionary.
    void performDictionaryLookupAtLocation(const WebCore::FloatPoint&);
    void performDictionaryLookupOfCurrentSelection();
#endif

    class PolicyDecisionSender;
    enum class WillContinueLoadInNewProcess : bool { No, Yes };
    void receivedPolicyDecision(WebCore::PolicyAction, API::Navigation*, RefPtr<API::WebsitePolicies>&&, Variant<Ref<API::NavigationResponse>, Ref<API::NavigationAction>>&&, Ref<PolicyDecisionSender>&&, Optional<SandboxExtension::Handle> = { }, WillContinueLoadInNewProcess = WillContinueLoadInNewProcess::No);
    void receivedNavigationPolicyDecision(WebCore::PolicyAction, API::Navigation*, Ref<API::NavigationAction>&&, ProcessSwapRequestedByClient, WebFrameProxy&, RefPtr<API::WebsitePolicies>&&, Ref<PolicyDecisionSender>&&);

    void backForwardRemovedItem(const WebCore::BackForwardItemIdentifier&);

#if ENABLE(DRAG_SUPPORT)    
    // Drag and drop support.
    void dragEntered(WebCore::DragData&, const String& dragStorageName = String());
    void dragUpdated(WebCore::DragData&, const String& dragStorageName = String());
    void dragExited(WebCore::DragData&, const String& dragStorageName = String());
    void performDragOperation(WebCore::DragData&, const String& dragStorageName, SandboxExtension::Handle&&, SandboxExtension::HandleArray&&);
    void didPerformDragOperation(bool handled);

    void didPerformDragControllerAction(Optional<WebCore::DragOperation>, WebCore::DragHandlingMethod, bool mouseIsOverFileInput, unsigned numberOfItemsToBeAccepted, const WebCore::IntRect& insertionRect, const WebCore::IntRect& editableElementRect);
    void dragEnded(const WebCore::IntPoint& clientPosition, const WebCore::IntPoint& globalPosition, OptionSet<WebCore::DragOperation>);
    void didStartDrag();
    void dragCancelled();
    void setDragCaretRect(const WebCore::IntRect&);
#if PLATFORM(COCOA)
    void startDrag(const WebCore::DragItem&, const ShareableBitmap::Handle& dragImageHandle);
    void setPromisedDataForImage(const String& pasteboardName, const SharedMemory::IPCHandle& imageHandle, const String& filename, const String& extension,
        const String& title, const String& url, const String& visibleURL, const SharedMemory::IPCHandle& archiveHandle);
#endif
#if PLATFORM(GTK)
    void startDrag(WebCore::SelectionData&&, OptionSet<WebCore::DragOperation>, const ShareableBitmap::Handle& dragImage);
#endif
#endif

    void processDidBecomeUnresponsive();
    void processDidBecomeResponsive();
    void resetStateAfterProcessTermination(ProcessTerminationReason);
    void provisionalProcessDidTerminate();
    void dispatchProcessDidTerminate(ProcessTerminationReason);
    void willChangeProcessIsResponsive();
    void didChangeProcessIsResponsive();

#if PLATFORM(IOS_FAMILY)
    void processWillBecomeSuspended();
    void processWillBecomeForeground();
#endif
#if PLATFORM(MACCATALYST)
    void isUserFacingChanged(bool) final;
#endif

#if HAVE(VISIBILITY_PROPAGATION_VIEW)
    void didCreateContextForVisibilityPropagation(LayerHostingContextID);
    void didCreateContextInGPUProcessForVisibilityPropagation(LayerHostingContextID);
    LayerHostingContextID contextIDForVisibilityPropagation() const { return m_contextIDForVisibilityPropagation; }
#endif

#if ENABLE(GPU_PROCESS)
    void gpuProcessCrashed();
#endif

    virtual void enterAcceleratedCompositingMode(const LayerTreeContext&);
    virtual void exitAcceleratedCompositingMode();
    virtual void updateAcceleratedCompositingMode(const LayerTreeContext&);
    void didFirstLayerFlush(const LayerTreeContext&);

    void addEditCommand(WebEditCommandProxy&);
    void removeEditCommand(WebEditCommandProxy&);
    void registerEditCommand(Ref<WebEditCommandProxy>&&, UndoOrRedo);

    bool canUndo();
    bool canRedo();

#if PLATFORM(COCOA)
    void registerKeypressCommandName(const String& name) { m_knownKeypressCommandNames.add(name); }
    bool isValidKeypressCommandName(const String& name) const { return m_knownKeypressCommandNames.contains(name); }
#endif

    WebProcessProxy& ensureRunningProcess();
    WebProcessProxy& process() const { return m_process; }
    ProcessID processIdentifier() const;

    WebBackForwardCache& backForwardCache() const;

    const WebPreferences& preferences() const { return m_preferences; }
    WebPreferences& preferences() { return m_preferences; }
    void setPreferences(WebPreferences&);

    WebPageGroup& pageGroup() { return m_pageGroup; }

    bool hasRunningProcess() const;
    void launchInitialProcessIfNecessary();

#if ENABLE(DRAG_SUPPORT)
    Optional<WebCore::DragOperation> currentDragOperation() const { return m_currentDragOperation; }
    WebCore::DragHandlingMethod currentDragHandlingMethod() const { return m_currentDragHandlingMethod; }
    bool currentDragIsOverFileInput() const { return m_currentDragIsOverFileInput; }
    unsigned currentDragNumberOfFilesToBeAccepted() const { return m_currentDragNumberOfFilesToBeAccepted; }
    WebCore::IntRect currentDragCaretRect() const { return m_currentDragCaretRect; }
    WebCore::IntRect currentDragCaretEditableElementRect() const { return m_currentDragCaretEditableElementRect; }
    void resetCurrentDragInformation();
    void didEndDragging();
#endif

    void preferencesDidChange();

#if ENABLE(CONTEXT_MENUS)
    // Called by the WebContextMenuProxy.
    void contextMenuItemSelected(const WebContextMenuItemData&);
    void handleContextMenuKeyEvent();
#endif

    // Called by the WebOpenPanelResultListenerProxy.
#if PLATFORM(IOS_FAMILY)
    void didChooseFilesForOpenPanelWithDisplayStringAndIcon(const Vector<String>&, const String& displayString, const API::Data* iconData);
#endif
    void didChooseFilesForOpenPanel(const Vector<String>& fileURLs, const Vector<String>& allowedMIMETypes);
    void didCancelForOpenPanel();

    WebPageCreationParameters creationParameters(WebProcessProxy&, DrawingAreaProxy&, RefPtr<API::WebsitePolicies>&& = nullptr);

    void handleDownloadRequest(DownloadProxy&);
    void resumeDownload(const API::Data& resumeData, const String& path, CompletionHandler<void(DownloadProxy*)>&&);
    void downloadRequest(WebCore::ResourceRequest&&, CompletionHandler<void(DownloadProxy*)>&&);

    void advanceToNextMisspelling(bool startBeforeSelection);
    void changeSpellingToWord(const String& word);
#if USE(APPKIT)
    void uppercaseWord();
    void lowercaseWord();
    void capitalizeWord();
#endif

#if PLATFORM(COCOA)
    bool isSmartInsertDeleteEnabled() const { return m_isSmartInsertDeleteEnabled; }
    void setSmartInsertDeleteEnabled(bool);
#endif

    void setCanRunModal(bool);
    bool canRunModal();

    void beginPrinting(WebFrameProxy*, const PrintInfo&);
    void endPrinting();
    void computePagesForPrinting(WebFrameProxy*, const PrintInfo&, Ref<ComputedPagesCallback>&&);
#if PLATFORM(COCOA)
    void drawRectToImage(WebFrameProxy*, const PrintInfo&, const WebCore::IntRect&, const WebCore::IntSize&, Ref<ImageCallback>&&);
    void drawPagesToPDF(WebFrameProxy*, const PrintInfo&, uint32_t first, uint32_t count, Ref<DataCallback>&&);
    void drawToPDF(WebCore::FrameIdentifier, const Optional<WebCore::FloatRect>&, DrawToPDFCallback::CallbackFunction&&);
    void drawToPDFCallback(const IPC::DataReference& pdfData, WebKit::CallbackID);
#if PLATFORM(IOS_FAMILY)
    uint32_t computePagesForPrintingAndDrawToPDF(WebCore::FrameIdentifier, const PrintInfo&, DrawToPDFCallback::CallbackFunction&&);
#endif
#elif PLATFORM(GTK)
    void drawPagesForPrinting(WebFrameProxy*, const PrintInfo&, Ref<PrintFinishedCallback>&&);
#endif

    PageLoadState& pageLoadState() { return m_pageLoadState; }

#if PLATFORM(COCOA)
    void handleAlternativeTextUIResult(const String& result);
#endif

    void saveDataToFileInDownloadsFolder(String&& suggestedFilename, String&& mimeType, URL&& originatingURL, API::Data&);
    void savePDFToFileInDownloadsFolder(String&& suggestedFilename, URL&& originatingURL, const IPC::DataReference&);
#if ENABLE(PDFKIT_PLUGIN)
    void savePDFToTemporaryFolderAndOpenWithNativeApplication(const String& suggestedFilename, FrameInfoData&&, const IPC::DataReference&, const String& pdfUUID);
#if !ENABLE(UI_PROCESS_PDF_HUD)
    void openPDFFromTemporaryFolderWithNativeApplication(FrameInfoData&&, const String& pdfUUID);
#endif
#endif

#if ENABLE(PDFKIT_PLUGIN)
    void showPDFContextMenu(const WebKit::PDFContextMenu&, PDFPluginIdentifier, CompletionHandler<void(Optional<int32_t>&&)>&&);
#endif
    WebCore::IntRect visibleScrollerThumbRect() const { return m_visibleScrollerThumbRect; }

    uint64_t renderTreeSize() const { return m_renderTreeSize; }

    void setMediaVolume(float);
    void setMuted(WebCore::MediaProducer::MutedStateFlags);
    bool isAudioMuted() const { return m_mutedState & WebCore::MediaProducer::AudioIsMuted; };
    void setMayStartMediaWhenInWindow(bool);
    bool mayStartMediaWhenInWindow() const { return m_mayStartMediaWhenInWindow; }
    void setMediaCaptureEnabled(bool);
    bool mediaCaptureEnabled() const { return m_mediaCaptureEnabled; }
    void stopMediaCapture();

    void pauseAllMediaPlayback(CompletionHandler<void(void)>&&);
    void suspendAllMediaPlayback(CompletionHandler<void(void)>&&);
    void resumeAllMediaPlayback(CompletionHandler<void(void)>&&);
    void requestMediaPlaybackState(CompletionHandler<void(WebKit::MediaPlaybackState)>&&);

#if ENABLE(POINTER_LOCK)
    void didAllowPointerLock();
    void didDenyPointerLock();
#endif

    // WebPopupMenuProxy::Client
    NativeWebMouseEvent* currentlyProcessedMouseDownEvent() override;

    void setSuppressVisibilityUpdates(bool flag);
    bool suppressVisibilityUpdates() { return m_suppressVisibilityUpdates; }

#if PLATFORM(IOS_FAMILY)
    void willStartUserTriggeredZooming();

    void potentialTapAtPosition(const WebCore::FloatPoint&, bool shouldRequestMagnificationInformation, uint64_t& requestID);
    void commitPotentialTap(OptionSet<WebKit::WebEvent::Modifier>, TransactionID layerTreeTransactionIdAtLastTouchStart, WebCore::PointerID);
    void cancelPotentialTap();
    void tapHighlightAtPosition(const WebCore::FloatPoint&, uint64_t& requestID);
    void attemptSyntheticClick(const WebCore::FloatPoint&, OptionSet<WebKit::WebEvent::Modifier>, TransactionID layerTreeTransactionIdAtLastTouchStart);
    void didRecognizeLongPress();
    void handleDoubleTapForDoubleClickAtPoint(const WebCore::IntPoint&, OptionSet<WebEvent::Modifier>, TransactionID layerTreeTransactionIdAtLastTouchStart);

    void inspectorNodeSearchMovedToPosition(const WebCore::FloatPoint&);
    void inspectorNodeSearchEndedAtPosition(const WebCore::FloatPoint&);

    void blurFocusedElement();
    void setIsShowingInputViewForFocusedElement(bool);
#endif

    void postMessageToInjectedBundle(const String& messageName, API::Object* messageBody);

#if ENABLE(INPUT_TYPE_COLOR)
    void setColorPickerColor(const WebCore::Color&);
    void endColorPicker();
#endif

    bool isLayerTreeFrozenDueToSwipeAnimation() const { return m_isLayerTreeFrozenDueToSwipeAnimation; }

    WebCore::IntSize minimumSizeForAutoLayout() const { return m_minimumSizeForAutoLayout; }
    void setMinimumSizeForAutoLayout(const WebCore::IntSize&);

    WebCore::IntSize sizeToContentAutoSizeMaximumSize() const { return m_sizeToContentAutoSizeMaximumSize; }
    void setSizeToContentAutoSizeMaximumSize(const WebCore::IntSize&);

    bool autoSizingShouldExpandToViewHeight() const { return m_autoSizingShouldExpandToViewHeight; }
    void setAutoSizingShouldExpandToViewHeight(bool);

    void setViewportSizeForCSSViewportUnits(const WebCore::IntSize&);
    WebCore::IntSize viewportSizeForCSSViewportUnits() const { return m_viewportSizeForCSSViewportUnits.valueOr(WebCore::IntSize()); }

    void didReceiveAuthenticationChallengeProxy(Ref<AuthenticationChallengeProxy>&&, NegotiatedLegacyTLS);
    void negotiatedLegacyTLS();
    void didNegotiateModernTLS(const WebCore::AuthenticationChallenge&);

    SpellDocumentTag spellDocumentTag();

    void didFinishCheckingText(uint64_t requestID, const Vector<WebCore::TextCheckingResult>&);
    void didCancelCheckingText(uint64_t requestID);
        
    void setScrollPinningBehavior(WebCore::ScrollPinningBehavior);
    WebCore::ScrollPinningBehavior scrollPinningBehavior() const { return m_scrollPinningBehavior; }

    void setOverlayScrollbarStyle(Optional<WebCore::ScrollbarOverlayStyle>);
    Optional<WebCore::ScrollbarOverlayStyle> overlayScrollbarStyle() const { return m_scrollbarOverlayStyle; }

    // When the state of the window changes such that the WebPage needs immediate update, the UIProcess sends a new
    // ActivityStateChangeID to the WebProcess through the SetActivityState message. The UIProcess will wait till it
    // receives a CommitLayerTree which has an ActivityStateChangeID equal to or greater than the one it sent.
    ActivityStateChangeID takeNextActivityStateChangeID() { return ++m_currentActivityStateChangeID; }

    bool shouldRecordNavigationSnapshots() const { return m_shouldRecordNavigationSnapshots; }
    void setShouldRecordNavigationSnapshots(bool shouldRecordSnapshots) { m_shouldRecordNavigationSnapshots = shouldRecordSnapshots; }
    void recordAutomaticNavigationSnapshot();
    void suppressNextAutomaticNavigationSnapshot() { m_shouldSuppressNextAutomaticNavigationSnapshot = true; }
    void recordNavigationSnapshot(WebBackForwardListItem&);
    void requestFocusedElementInformation(CompletionHandler<void(const FocusedElementInformation&)>&&);

#if PLATFORM(COCOA) || PLATFORM(GTK)
    RefPtr<ViewSnapshot> takeViewSnapshot(Optional<WebCore::IntRect>&&);
#endif

#if ENABLE(WEB_CRYPTO)
    void wrapCryptoKey(const Vector<uint8_t>&, CompletionHandler<void(bool, Vector<uint8_t>&&)>&&);
    void unwrapCryptoKey(const Vector<uint8_t>&, CompletionHandler<void(bool, Vector<uint8_t>&&)>&&);
#endif

    void signedPublicKeyAndChallengeString(unsigned keySizeIndex, const String& challengeString, const URL&, CompletionHandler<void(String)>&&);

    void takeSnapshot(WebCore::IntRect, WebCore::IntSize bitmapSize, SnapshotOptions, WTF::Function<void (const ShareableBitmap::Handle&, CallbackBase::Error)>&&);

    void navigationGestureDidBegin();
    void navigationGestureWillEnd(bool willNavigate, WebBackForwardListItem&);
    void navigationGestureDidEnd(bool willNavigate, WebBackForwardListItem&);
    void navigationGestureDidEnd();
    void navigationGestureSnapshotWasRemoved();
    void willRecordNavigationSnapshot(WebBackForwardListItem&);

    bool isShowingNavigationGestureSnapshot() const { return m_isShowingNavigationGestureSnapshot; }

    bool isPlayingAudio() const { return !!(m_mediaState & WebCore::MediaProducer::IsPlayingAudio); }
    void isPlayingMediaDidChange(WebCore::MediaProducer::MediaStateFlags, uint64_t);
    void updateReportedMediaCaptureState();

    void updatePlayingMediaDidChange(WebCore::MediaProducer::MediaStateFlags);
    bool isCapturingAudio() const { return m_mediaState & WebCore::MediaProducer::AudioCaptureMask; }
    bool isCapturingVideo() const { return m_mediaState & WebCore::MediaProducer::VideoCaptureMask; }
    bool hasActiveAudioStream() const { return m_mediaState & WebCore::MediaProducer::HasActiveAudioCaptureDevice; }
    bool hasActiveVideoStream() const { return m_mediaState & WebCore::MediaProducer::HasActiveVideoCaptureDevice; }
    WebCore::MediaProducer::MediaStateFlags reportedMediaState() const { return m_reportedMediaCaptureState | (m_mediaState & ~WebCore::MediaProducer::MediaCaptureMask); }
    WebCore::MediaProducer::MutedStateFlags mutedStateFlags() const { return m_mutedState; }

    void handleAutoplayEvent(WebCore::AutoplayEvent, OptionSet<WebCore::AutoplayEventFlags>);

    void videoControlsManagerDidChange();
    bool hasActiveVideoForControlsManager() const;
    void requestControlledElementID() const;
    void handleControlledElementIDResponse(const String&) const;
    bool isPlayingVideoInEnhancedFullscreen() const;

#if PLATFORM(COCOA)
    void requestActiveNowPlayingSessionInfo(Ref<NowPlayingInfoCallback>&&);
    void nowPlayingInfoCallback(bool, bool, const String&, double, double, uint64_t, CallbackID);
#endif

#if PLATFORM(MAC)
    API::HitTestResult* lastMouseMoveHitTestResult() const { return m_lastMouseMoveHitTestResult.get(); }
    void performImmediateActionHitTestAtLocation(WebCore::FloatPoint);

    void immediateActionDidUpdate();
    void immediateActionDidCancel();
    void immediateActionDidComplete();

    NSObject *immediateActionAnimationControllerForHitTestResult(RefPtr<API::HitTestResult>, uint64_t, RefPtr<API::Object>);

    void handleAcceptedCandidate(WebCore::TextCheckingResult);
    void didHandleAcceptedCandidate();

    void setHeaderBannerHeightForTesting(int);
    void setFooterBannerHeightForTesting(int);

    void didEndMagnificationGesture();
#endif

    bool scrollingUpdatesDisabledForTesting();

    void installActivityStateChangeCompletionHandler(Function<void()>&&);

#if USE(UNIFIED_TEXT_CHECKING)
    void checkTextOfParagraph(const String& text, OptionSet<WebCore::TextCheckingType> checkingTypes, int32_t insertionPoint, CompletionHandler<void(Vector<WebCore::TextCheckingResult>&&)>&&);
#endif
    void getGuessesForWord(const String& word, const String& context, int32_t insertionPoint, CompletionHandler<void(Vector<String>&&)>&&);

    void setShouldDispatchFakeMouseMoveEvents(bool);

    // Diagnostic messages logging.
    void logDiagnosticMessage(const String& message, const String& description, WebCore::ShouldSample);
    void logDiagnosticMessageWithResult(const String& message, const String& description, uint32_t result, WebCore::ShouldSample);
    void logDiagnosticMessageWithValue(const String& message, const String& description, double value, unsigned significantFigures, WebCore::ShouldSample);
    void logDiagnosticMessageWithEnhancedPrivacy(const String& message, const String& description, WebCore::ShouldSample);
    void logDiagnosticMessageWithValueDictionary(const String& message, const String& description, const WebCore::DiagnosticLoggingClient::ValueDictionary&, WebCore::ShouldSample);

    // Performance logging.
    void logScrollingEvent(uint32_t eventType, MonotonicTime, uint64_t);

    // Form validation messages.
    void showValidationMessage(const WebCore::IntRect& anchorClientRect, const String& message);
    void hideValidationMessage();
#if PLATFORM(COCOA)
    WebCore::ValidationBubble* validationBubble() const { return m_validationBubble.get(); } // For testing.
#endif

#if PLATFORM(IOS_FAMILY)
    void setIsKeyboardAnimatingIn(bool isKeyboardAnimatingIn) { m_isKeyboardAnimatingIn = isKeyboardAnimatingIn; }

    void setWaitingForPostLayoutEditorStateUpdateAfterFocusingElement(bool waitingForPostLayoutEditorStateUpdateAfterFocusingElement) { m_waitingForPostLayoutEditorStateUpdateAfterFocusingElement = waitingForPostLayoutEditorStateUpdateAfterFocusingElement; }
    bool waitingForPostLayoutEditorStateUpdateAfterFocusingElement() const { return m_waitingForPostLayoutEditorStateUpdateAfterFocusingElement; }

    const Function<bool()>& deviceOrientationUserPermissionHandlerForTesting() const { return m_deviceOrientationUserPermissionHandlerForTesting; };
    void setDeviceOrientationUserPermissionHandlerForTesting(Function<bool()>&& handler) { m_deviceOrientationUserPermissionHandlerForTesting = WTFMove(handler); }
    void setDeviceHasAGXCompilerServiceForTesting() const;
#endif

#if ENABLE(WIRELESS_PLAYBACK_TARGET) && !PLATFORM(IOS_FAMILY)
    void addPlaybackTargetPickerClient(WebCore::PlaybackTargetClientContextIdentifier);
    void removePlaybackTargetPickerClient(WebCore::PlaybackTargetClientContextIdentifier);
    void showPlaybackTargetPicker(WebCore::PlaybackTargetClientContextIdentifier, const WebCore::FloatRect&, bool hasVideo);
    void playbackTargetPickerClientStateDidChange(WebCore::PlaybackTargetClientContextIdentifier, WebCore::MediaProducer::MediaStateFlags);
    void setMockMediaPlaybackTargetPickerEnabled(bool);
    void setMockMediaPlaybackTargetPickerState(const String&, WebCore::MediaPlaybackTargetContext::State);
    void mockMediaPlaybackTargetPickerDismissPopup();

    // WebMediaSessionManagerClient
    void setPlaybackTarget(WebCore::PlaybackTargetClientContextIdentifier, Ref<WebCore::MediaPlaybackTarget>&&) final;
    void externalOutputDeviceAvailableDidChange(WebCore::PlaybackTargetClientContextIdentifier, bool) final;
    void setShouldPlayToPlaybackTarget(WebCore::PlaybackTargetClientContextIdentifier, bool) final;
    void playbackTargetPickerWasDismissed(WebCore::PlaybackTargetClientContextIdentifier) final;
    bool alwaysOnLoggingAllowed() final { return isAlwaysOnLoggingAllowed(); }
    PlatformView* platformView() const final;
#endif

    void didChangeBackgroundColor();
    void didLayoutForCustomContentProvider();

    // For testing
    void clearWheelEventTestMonitor();
    void callAfterNextPresentationUpdate(WTF::Function<void (CallbackBase::Error)>&&);

    void didReachLayoutMilestone(OptionSet<WebCore::LayoutMilestone>);

    void didRestoreScrollPosition();

    void getLoadDecisionForIcon(const WebCore::LinkIcon&, WebKit::CallbackID);
    void finishedLoadingIcon(WebKit::CallbackID, const IPC::DataReference&);

    void setFocus(bool focused);
    void setWindowFrame(const WebCore::FloatRect&);
    void getWindowFrame(Messages::WebPageProxy::GetWindowFrameDelayedReply&&);
    void getWindowFrameWithCallback(Function<void(WebCore::FloatRect)>&&);

    WebCore::UserInterfaceLayoutDirection userInterfaceLayoutDirection();
    void setUserInterfaceLayoutDirection(WebCore::UserInterfaceLayoutDirection);

    bool hasHadSelectionChangesFromUserInteraction() const { return m_hasHadSelectionChangesFromUserInteraction; }

#if HAVE(TOUCH_BAR)
    bool isTouchBarUpdateSupressedForHiddenContentEditable() const { return m_isTouchBarUpdateSupressedForHiddenContentEditable; }
    bool isNeverRichlyEditableForTouchBar() const { return m_isNeverRichlyEditableForTouchBar; }
#endif

    bool isAlwaysOnLoggingAllowed() const;

#if ENABLE(GAMEPAD)
    void gamepadActivity(const Vector<GamepadData>&, WebCore::EventMakesGamepadsVisible);
#endif

    void isLoadingChanged() { activityStateDidChange(WebCore::ActivityState::IsLoading); }

    void clearUserMediaState();

    void setShouldSkipWaitingForPaintAfterNextViewDidMoveToWindow(bool shouldSkip) { m_shouldSkipWaitingForPaintAfterNextViewDidMoveToWindow = shouldSkip; }

    void setURLSchemeHandlerForScheme(Ref<WebURLSchemeHandler>&&, const String& scheme);
    WebURLSchemeHandler* urlSchemeHandlerForScheme(const String& scheme);

#if PLATFORM(COCOA)
    void createSandboxExtensionsIfNeeded(const Vector<String>& files, SandboxExtension::Handle& fileReadHandle, SandboxExtension::HandleArray& fileUploadHandles);
#endif
    void editorStateChanged(const EditorState&);
    void updateEditorState(const EditorState&);
    void scheduleFullEditorStateUpdate();
    void dispatchDidUpdateEditorState();

#if HAVE(TOUCH_BAR)
    void touchBarMenuDataRemoved();
    void touchBarMenuDataChanged(const TouchBarMenuData&);
    void touchBarMenuItemDataAdded(const TouchBarMenuItemData&);
    void touchBarMenuItemDataRemoved(const TouchBarMenuItemData&);
#endif

#if ENABLE(RESOURCE_LOAD_STATISTICS)
    void requestStorageAccessConfirm(const WebCore::RegistrableDomain& subFrameDomain, const WebCore::RegistrableDomain& topFrameDomain, WebCore::FrameIdentifier, CompletionHandler<void(bool)>&&);
    void didCommitCrossSiteLoadWithDataTransferFromPrevalentResource();
    void getLoadedSubresourceDomains(CompletionHandler<void(Vector<WebCore::RegistrableDomain>&&)>&&);
    void clearLoadedSubresourceDomains();
#endif

#if ENABLE(DEVICE_ORIENTATION)
    void shouldAllowDeviceOrientationAndMotionAccess(WebCore::FrameIdentifier, FrameInfoData&&, bool mayPrompt, CompletionHandler<void(WebCore::DeviceOrientationOrMotionPermissionState)>&&);
#endif

    static WebPageProxy* nonEphemeralWebPageProxy();

#if ENABLE(ATTACHMENT_ELEMENT)
    RefPtr<API::Attachment> attachmentForIdentifier(const String& identifier) const;
    void insertAttachment(Ref<API::Attachment>&&, Function<void(CallbackBase::Error)>&&);
    void updateAttachmentAttributes(const API::Attachment&, Function<void(CallbackBase::Error)>&&);
    void serializedAttachmentDataForIdentifiers(const Vector<String>&, CompletionHandler<void(Vector<WebCore::SerializedAttachmentData>&&)>&&);
    void registerAttachmentIdentifier(const String&);
    void didInvalidateDataForAttachment(API::Attachment&);
#if HAVE(QUICKLOOK_THUMBNAILING)
    void updateAttachmentIcon(const String&, const RefPtr<ShareableBitmap>&);
    void requestThumbnailWithPath(const String&, const String&);
    void requestThumbnailWithFileWrapper(NSFileWrapper*, const String&);
    void requestThumbnailWithOperation(WKQLThumbnailLoadOperation*);
#endif
    enum class ShouldUpdateAttachmentAttributes : bool { No, Yes };
    ShouldUpdateAttachmentAttributes willUpdateAttachmentAttributes(const API::Attachment&);
#endif

#if ENABLE(APPLICATION_MANIFEST)
    void getApplicationManifest(Function<void(const Optional<WebCore::ApplicationManifest>&, CallbackBase::Error)>&&);
#endif

    WebPreferencesStore preferencesStore() const;

    void setDefersLoadingForTesting(bool);

    bool isPageOpenedByDOMShowingInitialEmptyDocument() const;

    WebCore::IntRect syncRootViewToScreen(const WebCore::IntRect& viewRect);

#if ENABLE(DATALIST_ELEMENT)
    void didSelectOption(const String&);
    void didCloseSuggestions();
#endif

#if ENABLE(DATE_AND_TIME_INPUT_TYPES)
    void didChooseDate(StringView);
    void didEndDateTimePicker();
#endif

    void updateCurrentModifierState();

    ProvisionalPageProxy* provisionalPageProxy() const { return m_provisionalPage.get(); }
    void commitProvisionalPage(WebCore::FrameIdentifier, FrameInfoData&&, WebCore::ResourceRequest&&, uint64_t navigationID, const String& mimeType, bool frameHasCustomContentProvider, WebCore::FrameLoadType, const WebCore::CertificateInfo&, bool usedLegacyTLS, bool containsPluginDocument, Optional<WebCore::HasInsecureContent> forcedHasInsecureContent, WebCore::MouseEventPolicy, const UserData&);

    // Logic shared between the WebPageProxy and the ProvisionalPageProxy.
    void didStartProvisionalLoadForFrameShared(Ref<WebProcessProxy>&&, WebCore::FrameIdentifier, FrameInfoData&&, WebCore::ResourceRequest&&, uint64_t navigationID, URL&&, URL&& unreachableURL, const UserData&);
    void didFailProvisionalLoadForFrameShared(Ref<WebProcessProxy>&&, WebCore::FrameIdentifier, FrameInfoData&&, WebCore::ResourceRequest&&, uint64_t navigationID, const String& provisionalURL, const WebCore::ResourceError&, WebCore::WillContinueLoading, const UserData&);
    void didReceiveServerRedirectForProvisionalLoadForFrameShared(Ref<WebProcessProxy>&&, WebCore::FrameIdentifier, uint64_t navigationID, WebCore::ResourceRequest&&, const UserData&);
    void didPerformServerRedirectShared(Ref<WebProcessProxy>&&, const String& sourceURLString, const String& destinationURLString, WebCore::FrameIdentifier);
    void didPerformClientRedirectShared(Ref<WebProcessProxy>&&, const String& sourceURLString, const String& destinationURLString, WebCore::FrameIdentifier);
    void didNavigateWithNavigationDataShared(Ref<WebProcessProxy>&&, const WebNavigationDataStore&, WebCore::FrameIdentifier);
    void didChangeProvisionalURLForFrameShared(Ref<WebProcessProxy>&&, WebCore::FrameIdentifier, uint64_t navigationID, URL&&);
    void decidePolicyForNavigationActionAsyncShared(Ref<WebProcessProxy>&&, WebCore::PageIdentifier, WebCore::FrameIdentifier, FrameInfoData&&, WebCore::PolicyCheckIdentifier, uint64_t navigationID, NavigationActionData&&, FrameInfoData&& originatingFrameInfo, Optional<WebPageProxyIdentifier> originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData&, uint64_t listenerID);
    void decidePolicyForResponseShared(Ref<WebProcessProxy>&&, WebCore::PageIdentifier, WebCore::FrameIdentifier, FrameInfoData&&, WebCore::PolicyCheckIdentifier, uint64_t navigationID, const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, bool canShowMIMEType, const String& downloadAttribute, uint64_t listenerID, const UserData&);
    void startURLSchemeTaskShared(Ref<WebProcessProxy>&&, WebCore::PageIdentifier, URLSchemeTaskParameters&&);
    void loadDataWithNavigationShared(Ref<WebProcessProxy>&&, WebCore::PageIdentifier, API::Navigation&, const IPC::DataReference&, const String& MIMEType, const String& encoding, const String& baseURL, API::Object* userData, WebCore::ShouldTreatAsContinuingLoad, Optional<NavigatingToAppBoundDomain>, Optional<WebsitePoliciesData>&& = WTF::nullopt, WebCore::ShouldOpenExternalURLsPolicy = WebCore::ShouldOpenExternalURLsPolicy::ShouldNotAllow);
    void loadRequestWithNavigationShared(Ref<WebProcessProxy>&&, WebCore::PageIdentifier, API::Navigation&, WebCore::ResourceRequest&&, WebCore::ShouldOpenExternalURLsPolicy, API::Object* userData, WebCore::ShouldTreatAsContinuingLoad, Optional<NavigatingToAppBoundDomain>, Optional<WebsitePoliciesData>&& = WTF::nullopt);
    void backForwardGoToItemShared(Ref<WebProcessProxy>&&, const WebCore::BackForwardItemIdentifier&, CompletionHandler<void(const WebBackForwardListCounts&)>&&);
    void decidePolicyForNavigationActionSyncShared(Ref<WebProcessProxy>&&, WebCore::FrameIdentifier, bool isMainFrame, FrameInfoData&&, WebCore::PolicyCheckIdentifier, uint64_t navigationID, NavigationActionData&&, FrameInfoData&& originatingFrameInfo, Optional<WebPageProxyIdentifier> originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody, WebCore::ResourceResponse&& redirectResponse, const UserData&, Messages::WebPageProxy::DecidePolicyForNavigationActionSyncDelayedReply&&);
#if USE(QUICK_LOOK)
    void requestPasswordForQuickLookDocumentInMainFrameShared(const String& fileName, CompletionHandler<void(const String&)>&&);
#endif
#if ENABLE(CONTENT_FILTERING)
    void contentFilterDidBlockLoadForFrameShared(Ref<WebProcessProxy>&&, const WebCore::ContentFilterUnblockHandler&, WebCore::FrameIdentifier);
#endif

    void dumpPrivateClickMeasurement(CompletionHandler<void(const String&)>&&);
    void clearPrivateClickMeasurement(CompletionHandler<void()>&&);
    void setPrivateClickMeasurementOverrideTimerForTesting(bool value, CompletionHandler<void()>&&);
    void markAttributedPrivateClickMeasurementsAsExpiredForTesting(CompletionHandler<void()>&&);
    void simulateResourceLoadStatisticsSessionRestart(CompletionHandler<void()>&&);
    void setPrivateClickMeasurementConversionURLForTesting(const URL&, CompletionHandler<void()>&&);
    void markPrivateClickMeasurementsAsExpiredForTesting(CompletionHandler<void()>&&);

#if ENABLE(SPEECH_SYNTHESIS)
    void speechSynthesisVoiceList(CompletionHandler<void(Vector<WebSpeechSynthesisVoice>&&)>&&);
    void speechSynthesisSpeak(const String&, const String&, float volume, float rate, float pitch, MonotonicTime startTime, const String& voiceURI, const String& voiceName, const String& voiceLang, bool localService, bool defaultVoice, CompletionHandler<void()>&&);
    void speechSynthesisSetFinishedCallback(CompletionHandler<void()>&&);
    void speechSynthesisCancel();
    void speechSynthesisPause(CompletionHandler<void()>&&);
    void speechSynthesisResume(CompletionHandler<void()>&&);
#endif

    void configureLoggingChannel(const String&, WTFLogChannelState, WTFLogLevel);

    void addObserver(WebViewDidMoveToWindowObserver&);
    void removeObserver(WebViewDidMoveToWindowObserver&);
    void webViewDidMoveToWindow();

#if HAVE(APP_SSO)
    void setShouldSuppressSOAuthorizationInAllNavigationPolicyDecision() { m_shouldSuppressSOAuthorizationInAllNavigationPolicyDecision = true; }
    void setShouldSuppressSOAuthorizationInNextNavigationPolicyDecision() { m_shouldSuppressSOAuthorizationInNextNavigationPolicyDecision = true; }
    void decidePolicyForSOAuthorizationLoad(const String&, CompletionHandler<void(SOAuthorizationLoadPolicy)>&&);
#endif

    Logger& logger();

    // IPC::MessageReceiver
    // Implemented in generated WebPageProxyMessageReceiver.cpp
    void didReceiveMessage(IPC::Connection&, IPC::Decoder&) override;
    void didReceiveSyncMessage(IPC::Connection&, IPC::Decoder&, std::unique_ptr<IPC::Encoder>&) override;

    void requestStorageSpace(WebCore::FrameIdentifier, const String& originIdentifier, const String& databaseName, const String& displayName, uint64_t currentQuota, uint64_t currentOriginUsage, uint64_t currentDatabaseUsage, uint64_t expectedUsage, WTF::CompletionHandler<void(uint64_t)>&&);

    URL currentResourceDirectoryURL() const;

#if ENABLE(MEDIA_STREAM)
    void setMockCaptureDevicesEnabledOverride(Optional<bool>);
    void willStartCapture(const UserMediaPermissionRequestProxy&, CompletionHandler<void()>&&);
#endif

    void maybeInitializeSandboxExtensionHandle(WebProcessProxy&, const URL&, const URL& resourceDirectoryURL, SandboxExtension::Handle&, bool checkAssumedReadAccessToResourceURL = true);

#if ENABLE(WEB_AUTHN)
    void setMockWebAuthenticationConfiguration(WebCore::MockWebAuthenticationConfiguration&&);
#endif

    using TextManipulationItemCallback = WTF::Function<void(const Vector<WebCore::TextManipulationController::ManipulationItem>&)>;
    void startTextManipulations(const Vector<WebCore::TextManipulationController::ExclusionRule>&, TextManipulationItemCallback&&, WTF::CompletionHandler<void()>&&);
    void didFindTextManipulationItems(const Vector<WebCore::TextManipulationController::ManipulationItem>&);
    void completeTextManipulation(const Vector<WebCore::TextManipulationController::ManipulationItem>&, WTF::Function<void(bool allFailed, const Vector<WebCore::TextManipulationController::ManipulationFailure>&)>&&);

    const String& overriddenMediaType() const { return m_overriddenMediaType; }
    void setOverriddenMediaType(const String&);

    void setCORSDisablingPatterns(Vector<String>&&);
    const Vector<String>& corsDisablingPatterns() const { return m_corsDisablingPatterns; }

    void getProcessDisplayName(CompletionHandler<void(String&&)>&&);

    void setOrientationForMediaCapture(uint64_t);

    bool isHandlingPreventableTouchStart() const { return m_handlingPreventableTouchStartCount; }

    bool hasQueuedKeyEvent() const;
    const NativeWebKeyboardEvent& firstQueuedKeyEvent() const;

#if PLATFORM(IOS)
    void grantAccessToAssetServices();
    void revokeAccessToAssetServices();
#endif

#if PLATFORM(COCOA)
    void grantAccessToPreferenceService();
#endif

    void setIsTakingSnapshotsForApplicationSuspension(bool);
    void setNeedsDOMWindowResizeEvent();

#if ENABLE(APP_BOUND_DOMAINS)
    Optional<NavigatingToAppBoundDomain> isNavigatingToAppBoundDomain() const { return m_isNavigatingToAppBoundDomain; }
    void isNavigatingToAppBoundDomainTesting(CompletionHandler<void(bool)>&&);
    void isForcedIntoAppBoundModeTesting(CompletionHandler<void(bool)>&&);
    Optional<NavigatingToAppBoundDomain> isTopFrameNavigatingToAppBoundDomain() const { return m_isTopFrameNavigatingToAppBoundDomain; }
#else
        Optional<NavigatingToAppBoundDomain> isNavigatingToAppBoundDomain() const { return WTF::nullopt; }
#endif

#if PLATFORM(COCOA)
    WebCore::ResourceError errorForUnpermittedAppBoundDomainNavigation(const URL&);
#endif

    void disableServiceWorkerEntitlementInNetworkProcess();
    void clearServiceWorkerEntitlementOverride(CompletionHandler<void()>&&);
        
#if PLATFORM(COCOA)
    void grantAccessToCurrentPasteboardData(const String& pasteboardName);
#endif

#if ENABLE(CONTEXT_MENUS)
    void platformDidSelectItemFromActiveContextMenu(const WebContextMenuItemData&);
#endif

#if ENABLE(MEDIA_USAGE)
    MediaUsageManager& mediaUsageManager();
    void addMediaUsageManagerSession(WebCore::MediaSessionIdentifier, const String&, const URL&);
    void updateMediaUsageManagerSessionState(WebCore::MediaSessionIdentifier, const WebCore::MediaUsageInfo&);
    void removeMediaUsageManagerSession(WebCore::MediaSessionIdentifier);
#endif

    void setHasExecutedAppBoundBehaviorBeforeNavigation() { m_hasExecutedAppBoundBehaviorBeforeNavigation = true; }

    WebPopupMenuProxy* activePopupMenu() const { return m_activePopupMenu.get(); }

    void preconnectTo(const URL&);

    bool canUseCredentialStorage() { return m_canUseCredentialStorage; }
    void setCanUseCredentialStorage(bool);

#if ENABLE(UI_PROCESS_PDF_HUD)
    void createPDFHUD(PDFPluginIdentifier, const WebCore::IntRect&);
    void updatePDFHUDLocation(PDFPluginIdentifier, const WebCore::IntRect&);
    void removePDFHUD(PDFPluginIdentifier);
    void pdfZoomIn(PDFPluginIdentifier);
    void pdfZoomOut(PDFPluginIdentifier);
    void pdfSaveToPDF(PDFPluginIdentifier);
    void pdfOpenWithPreview(PDFPluginIdentifier);
#endif

    Seconds mediaCaptureReportingDelay() const { return m_mediaCaptureReportingDelay; }
    void setMediaCaptureReportingDelay(Seconds captureReportingDelay) { m_mediaCaptureReportingDelay = captureReportingDelay; }
    size_t suspendMediaPlaybackCounter() { return m_suspendMediaPlaybackCounter; }

    void requestSpeechRecognitionPermission(const String& lang, const WebCore::ClientOrigin&, WebCore::FrameIdentifier, SpeechRecognitionPermissionRequestCallback&&);
    void requestSpeechRecognitionPermissionByDefaultAction(const WebCore::SecurityOrigin&, CompletionHandler<void(bool)>&&);
    void requestUserMediaPermissionForSpeechRecognition(WebCore::FrameIdentifier, const WebCore::SecurityOrigin&, const WebCore::SecurityOrigin&, CompletionHandler<void(bool)>&&);

    void syncIfMockDevicesEnabledChanged();

#if ENABLE(APP_HIGHLIGHTS)
    void createAppHighlightInSelectedRange(CreateNewGroupForHighlight);
#endif

#if ENABLE(MEDIA_STREAM)
    WebCore::CaptureSourceOrError createRealtimeMediaSourceForSpeechRecognition();
#endif

#if PLATFORM(MAC)
    void changeUniversalAccessZoomFocus(const WebCore::IntRect&, const WebCore::IntRect&);
#endif

    void dispatchWheelEventWithoutScrolling(const WebWheelEvent&, CompletionHandler<void(bool)>&&);

private:
    WebPageProxy(PageClient&, WebProcessProxy&, Ref<API::PageConfiguration>&&);
    void platformInitialize();

    void notifyProcessPoolToPrewarm();
    bool shouldUseBackForwardCache() const;

    bool shouldForceForegroundPriorityForClientNavigation() const;

    RefPtr<API::Navigation> goToBackForwardItem(WebBackForwardListItem&, WebCore::FrameLoadType);

    void updateActivityState(OptionSet<WebCore::ActivityState::Flag> flagsToUpdate = WebCore::ActivityState::allFlags());
    void updateThrottleState();
    void updateHiddenPageThrottlingAutoIncreases();

    bool suspendCurrentPageIfPossible(API::Navigation&, Optional<WebCore::FrameIdentifier> mainFrameID, ProcessSwapRequestedByClient, ShouldDelayClosingUntilFirstLayerFlush);

    enum class ResetStateReason {
        PageInvalidated,
        WebProcessExited,
        NavigationSwap,
    };
    void resetState(ResetStateReason);
    void resetStateAfterProcessExited(ProcessTerminationReason);

    void setUserAgent(String&&);

    // IPC::MessageSender
    bool sendMessage(std::unique_ptr<IPC::Encoder>, OptionSet<IPC::SendOption>, Optional<std::pair<CompletionHandler<void(IPC::Decoder*)>, uint64_t>>&&) override;
    IPC::Connection* messageSenderConnection() const override;
    uint64_t messageSenderDestinationID() const override;

    // WebPopupMenuProxy::Client
    void valueChangedForPopupMenu(WebPopupMenuProxy*, int32_t newSelectedIndex) override;
    void setTextFromItemForPopupMenu(WebPopupMenuProxy*, int32_t index) override;
#if PLATFORM(GTK)
    void failedToShowPopupMenu() override;
#endif

#if ENABLE(POINTER_LOCK)
    void requestPointerLock();
    void requestPointerUnlock();
#endif

    void didCreateMainFrame(WebCore::FrameIdentifier);
    void didCreateSubframe(WebCore::FrameIdentifier);
    void didCreateWindow(WebCore::FrameIdentifier, WebCore::GlobalWindowIdentifier&&);

    void didStartProvisionalLoadForFrame(WebCore::FrameIdentifier, FrameInfoData&&, WebCore::ResourceRequest&&, uint64_t navigationID, URL&&, URL&& unreachableURL, const UserData&);
    void didReceiveServerRedirectForProvisionalLoadForFrame(WebCore::FrameIdentifier, uint64_t navigationID, WebCore::ResourceRequest&&, const UserData&);
    void willPerformClientRedirectForFrame(WebCore::FrameIdentifier, const String& url, double delay, WebCore::LockBackForwardList);
    void didCancelClientRedirectForFrame(WebCore::FrameIdentifier);
    void didChangeProvisionalURLForFrame(WebCore::FrameIdentifier, uint64_t navigationID, URL&&);
    void didFailProvisionalLoadForFrame(WebCore::FrameIdentifier, FrameInfoData&&, WebCore::ResourceRequest&&, uint64_t navigationID, const String& provisionalURL, const WebCore::ResourceError&, WebCore::WillContinueLoading, const UserData&);
    void didCommitLoadForFrame(WebCore::FrameIdentifier, FrameInfoData&&, WebCore::ResourceRequest&&, uint64_t navigationID, const String& mimeType, bool frameHasCustomContentProvider, WebCore::FrameLoadType, const WebCore::CertificateInfo&, bool usedLegacyTLS, bool containsPluginDocument, Optional<WebCore::HasInsecureContent> forcedHasInsecureContent, WebCore::MouseEventPolicy, const UserData&);
    void didFinishDocumentLoadForFrame(WebCore::FrameIdentifier, uint64_t navigationID, const UserData&);
    void didFinishLoadForFrame(WebCore::FrameIdentifier, FrameInfoData&&, WebCore::ResourceRequest&&, uint64_t navigationID, const UserData&);
    void didFailLoadForFrame(WebCore::FrameIdentifier, FrameInfoData&&, WebCore::ResourceRequest&&, uint64_t navigationID, const WebCore::ResourceError&, const UserData&);
    void didSameDocumentNavigationForFrame(WebCore::FrameIdentifier, uint64_t navigationID, uint32_t sameDocumentNavigationType, URL&&, const UserData&);
    void didChangeMainDocument(WebCore::FrameIdentifier);
    void didExplicitOpenForFrame(WebCore::FrameIdentifier, URL&&, String&& mimeType);

    void didReceiveTitleForFrame(WebCore::FrameIdentifier, const String&, const UserData&);
    void didFirstLayoutForFrame(WebCore::FrameIdentifier, const UserData&);
    void didFirstVisuallyNonEmptyLayoutForFrame(WebCore::FrameIdentifier, const UserData&);
    void didDisplayInsecureContentForFrame(WebCore::FrameIdentifier, const UserData&);
    void didRunInsecureContentForFrame(WebCore::FrameIdentifier, const UserData&);
    void didDetectXSSForFrame(WebCore::FrameIdentifier, const UserData&);
    void mainFramePluginHandlesPageScaleGestureDidChange(bool);
    void didStartProgress();
    void didChangeProgress(double);
    void didFinishProgress();
    void setNetworkRequestsInProgress(bool);

    void didDestroyNavigation(uint64_t navigationID);

    void decidePolicyForNavigationAction(Ref<WebProcessProxy>&&, WebFrameProxy&, FrameInfoData&&, uint64_t navigationID, NavigationActionData&&, FrameInfoData&& originatingFrameInfo,
        Optional<WebPageProxyIdentifier> originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody,
        WebCore::ResourceResponse&& redirectResponse, const UserData&, Ref<PolicyDecisionSender>&&);
    void decidePolicyForNavigationActionAsync(WebCore::FrameIdentifier, FrameInfoData&&, WebCore::PolicyCheckIdentifier, uint64_t navigationID, NavigationActionData&&, FrameInfoData&& originatingFrameInfo,
        Optional<WebPageProxyIdentifier> originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody,
        WebCore::ResourceResponse&& redirectResponse, const UserData&, uint64_t listenerID);
    void decidePolicyForNavigationActionSync(WebCore::FrameIdentifier, bool isMainFrame, FrameInfoData&&, WebCore::PolicyCheckIdentifier, uint64_t navigationID, NavigationActionData&&, FrameInfoData&& originatingFrameInfo,
        Optional<WebPageProxyIdentifier> originatingPageID, const WebCore::ResourceRequest& originalRequest, WebCore::ResourceRequest&&, IPC::FormDataReference&& requestBody,
        WebCore::ResourceResponse&& redirectResponse, const UserData&, Messages::WebPageProxy::DecidePolicyForNavigationActionSyncDelayedReply&&);
    void decidePolicyForNewWindowAction(WebCore::FrameIdentifier, FrameInfoData&&, WebCore::PolicyCheckIdentifier, NavigationActionData&&,
        WebCore::ResourceRequest&&, const String& frameName, uint64_t listenerID, const UserData&);
    void decidePolicyForResponse(WebCore::FrameIdentifier, FrameInfoData&&, WebCore::PolicyCheckIdentifier, uint64_t navigationID,
        const WebCore::ResourceResponse&, const WebCore::ResourceRequest&, bool canShowMIMEType, const String& downloadAttribute, uint64_t listenerID, const UserData&);
    void unableToImplementPolicy(WebCore::FrameIdentifier, const WebCore::ResourceError&, const UserData&);
    void beginSafeBrowsingCheck(const URL&, bool, WebFramePolicyListenerProxy&);

    WebContentMode effectiveContentModeAfterAdjustingPolicies(API::WebsitePolicies&, const WebCore::ResourceRequest&);

    void willSubmitForm(WebCore::FrameIdentifier, WebCore::FrameIdentifier sourceFrameID, const Vector<std::pair<String, String>>& textFieldValues, uint64_t listenerID, const UserData&);

    void contentRuleListNotification(URL&&, WebCore::ContentRuleListResults&&);

    // History client
    void didNavigateWithNavigationData(const WebNavigationDataStore&, WebCore::FrameIdentifier);
    void didPerformClientRedirect(const String& sourceURLString, const String& destinationURLString, WebCore::FrameIdentifier);
    void didPerformServerRedirect(const String& sourceURLString, const String& destinationURLString, WebCore::FrameIdentifier);
    void didUpdateHistoryTitle(const String& title, const String& url, WebCore::FrameIdentifier);

    // UI client
    void createNewPage(FrameInfoData&&, WebPageProxyIdentifier originatingPageID, WebCore::ResourceRequest&&, WebCore::WindowFeatures&&, NavigationActionData&&, Messages::WebPageProxy::CreateNewPageDelayedReply&&);
    void showPage();
    void runJavaScriptAlert(WebCore::FrameIdentifier, WebKit::FrameInfoData&&, const String&, Messages::WebPageProxy::RunJavaScriptAlertDelayedReply&&);
    void runJavaScriptConfirm(WebCore::FrameIdentifier, WebKit::FrameInfoData&&, const String&, Messages::WebPageProxy::RunJavaScriptConfirmDelayedReply&&);
    void runJavaScriptPrompt(WebCore::FrameIdentifier, WebKit::FrameInfoData&&, const String&, const String&, Messages::WebPageProxy::RunJavaScriptPromptDelayedReply&&);
    void setStatusText(const String&);
    void mouseDidMoveOverElement(WebHitTestResultData&&, uint32_t modifiers, UserData&&);

#if ENABLE(NETSCAPE_PLUGIN_API)
    void unavailablePluginButtonClicked(uint32_t opaquePluginUnavailabilityReason, const String& mimeType, const String& pluginURLString, const String& pluginsPageURLString, const String& frameURLString, const String& pageURLString);
#endif // ENABLE(NETSCAPE_PLUGIN_API)
#if ENABLE(WEBGL)
    void webGLPolicyForURL(URL&&, Messages::WebPageProxy::WebGLPolicyForURLDelayedReply&&);
    void resolveWebGLPolicyForURL(URL&&, Messages::WebPageProxy::ResolveWebGLPolicyForURLDelayedReply&&);
#endif // ENABLE(WEBGL)
    void setToolbarsAreVisible(bool toolbarsAreVisible);
    void getToolbarsAreVisible(Messages::WebPageProxy::GetToolbarsAreVisibleDelayedReply&&);
    void setMenuBarIsVisible(bool menuBarIsVisible);
    void getMenuBarIsVisible(Messages::WebPageProxy::GetMenuBarIsVisibleDelayedReply&&);
    void setStatusBarIsVisible(bool statusBarIsVisible);
    void getStatusBarIsVisible(Messages::WebPageProxy::GetStatusBarIsVisibleDelayedReply&&);
    void getIsViewVisible(bool&);
    void setIsResizable(bool isResizable);
    void screenToRootView(const WebCore::IntPoint& screenPoint, Messages::WebPageProxy::ScreenToRootViewDelayedReply&&);
    void rootViewToScreen(const WebCore::IntRect& viewRect, Messages::WebPageProxy::RootViewToScreenDelayedReply&&);
    void accessibilityScreenToRootView(const WebCore::IntPoint& screenPoint, CompletionHandler<void(WebCore::IntPoint)>&&);
    void rootViewToAccessibilityScreen(const WebCore::IntRect& viewRect, CompletionHandler<void(WebCore::IntRect)>&&);
    void runBeforeUnloadConfirmPanel(WebCore::FrameIdentifier, FrameInfoData&&, const String& message, Messages::WebPageProxy::RunBeforeUnloadConfirmPanelDelayedReply&&);
    void didChangeViewportProperties(const WebCore::ViewportAttributes&);
    void pageDidScroll();
    void runOpenPanel(WebCore::FrameIdentifier, FrameInfoData&&, const WebCore::FileChooserSettings&);
    bool didChooseFilesForOpenPanelWithImageTranscoding(const Vector<String>& fileURLs, const Vector<String>& allowedMIMETypes);
    void showShareSheet(const WebCore::ShareDataWithParsedURL&, CompletionHandler<void(bool)>&&);
    void showContactPicker(const WebCore::ContactsRequestData&, CompletionHandler<void(Optional<Vector<WebCore::ContactInfo>>&&)>&&);
    void printFrame(WebCore::FrameIdentifier, CompletionHandler<void()>&&);
    void exceededDatabaseQuota(WebCore::FrameIdentifier, const String& originIdentifier, const String& databaseName, const String& displayName, uint64_t currentQuota, uint64_t currentOriginUsage, uint64_t currentDatabaseUsage, uint64_t expectedUsage, Messages::WebPageProxy::ExceededDatabaseQuotaDelayedReply&&);
    void reachedApplicationCacheOriginQuota(const String& originIdentifier, uint64_t currentQuota, uint64_t totalBytesNeeded, Messages::WebPageProxy::ReachedApplicationCacheOriginQuotaDelayedReply&&);

    void requestGeolocationPermissionForFrame(GeolocationIdentifier, FrameInfoData&&);
    void revokeGeolocationAuthorizationToken(const String& authorizationToken);

#if PLATFORM(GTK) || PLATFORM(WPE)
    void sendMessageToWebView(UserMessage&&);
    void sendMessageToWebViewWithReply(UserMessage&&, CompletionHandler<void(UserMessage&&)>&&);
#endif

#if ENABLE(MEDIA_STREAM)
    UserMediaPermissionRequestManagerProxy& userMediaPermissionRequestManager();
#endif
    void requestUserMediaPermissionForFrame(uint64_t userMediaID, WebCore::FrameIdentifier, const WebCore::SecurityOriginData& userMediaDocumentOriginIdentifier, const WebCore::SecurityOriginData& topLevelDocumentOriginIdentifier, WebCore::MediaStreamRequest&&);
    void enumerateMediaDevicesForFrame(WebCore::FrameIdentifier, const WebCore::SecurityOriginData& userMediaDocumentOriginData, const WebCore::SecurityOriginData& topLevelDocumentOriginData, CompletionHandler<void(const Vector<WebCore::CaptureDevice>&, const String&)>&&);
    void beginMonitoringCaptureDevices();

    void runModal();
    void notifyScrollerThumbIsVisibleInRect(const WebCore::IntRect&);
    void recommendedScrollbarStyleDidChange(int32_t newStyle);
    void didChangeScrollbarsForMainFrame(bool hasHorizontalScrollbar, bool hasVerticalScrollbar);
    void didChangeScrollOffsetPinningForMainFrame(bool pinnedToLeftSide, bool pinnedToRightSide, bool pinnedToTopSide, bool pinnedToBottomSide);
    void didChangePageCount(unsigned);
    void pageExtendedBackgroundColorDidChange(const WebCore::Color&);
#if ENABLE(NETSCAPE_PLUGIN_API)
    void didFailToInitializePlugin(const String& mimeType, const String& frameURLString, const String& pageURLString);
    void didBlockInsecurePluginVersion(const String& mimeType, const String& pluginURLString, const String& frameURLString, const String& pageURLString, bool replacementObscured);
#endif // ENABLE(NETSCAPE_PLUGIN_API)
    void setCanShortCircuitHorizontalWheelEvents(bool canShortCircuitHorizontalWheelEvents) { m_canShortCircuitHorizontalWheelEvents = canShortCircuitHorizontalWheelEvents; }

    enum class ProcessLaunchReason {
        InitialProcess,
        ProcessSwap,
        Crash
    };

    void launchProcess(const WebCore::RegistrableDomain&, ProcessLaunchReason);
    void swapToProvisionalPage(std::unique_ptr<ProvisionalPageProxy>);
    void didFailToSuspendAfterProcessSwap();
    void didSuspendAfterProcessSwap();
    void finishAttachingToWebProcess(ProcessLaunchReason);

    RefPtr<API::Navigation> launchProcessForReload();

    void requestNotificationPermission(uint64_t notificationID, const String& originString);
    void showNotification(const String& title, const String& body, const String& iconURL, const String& tag, const String& lang, WebCore::NotificationDirection, const String& originString, uint64_t notificationID);
    void cancelNotification(uint64_t notificationID);
    void clearNotifications(const Vector<uint64_t>& notificationIDs);
    void didDestroyNotification(uint64_t notificationID);

    void didChangeContentSize(const WebCore::IntSize&);
    void didChangeIntrinsicContentSize(const WebCore::IntSize&);

#if ENABLE(INPUT_TYPE_COLOR)
    void showColorPicker(const WebCore::Color& initialColor, const WebCore::IntRect&, Vector<WebCore::Color>&&);
    void didChooseColor(const WebCore::Color&) override;
    void didEndColorPicker() override;
#endif

#if ENABLE(DATALIST_ELEMENT)
    void showDataListSuggestions(WebCore::DataListSuggestionInformation&&);
    void handleKeydownInDataList(const String&);
    void endDataListSuggestions();
#endif

#if ENABLE(DATE_AND_TIME_INPUT_TYPES)
    void showDateTimePicker(WebCore::DateTimeChooserParameters&&);
    void endDateTimePicker();
#endif

    void closeOverlayedViews();

    void compositionWasCanceled();
    void setHasHadSelectionChangesFromUserInteraction(bool);

#if HAVE(TOUCH_BAR)
    void setIsTouchBarUpdateSupressedForHiddenContentEditable(bool);
    void setIsNeverRichlyEditableForTouchBar(bool);
#endif

    void requestDOMPasteAccess(const WebCore::IntRect&, const String&, CompletionHandler<void(WebCore::DOMPasteAccessResponse)>&&);
    void willPerformPasteCommand();

    // Back/Forward list management
    void backForwardAddItem(BackForwardListItemState&&);
    void backForwardGoToItem(const WebCore::BackForwardItemIdentifier&, CompletionHandler<void(const WebBackForwardListCounts&)>&&);
    void backForwardItemAtIndex(int32_t index, CompletionHandler<void(Optional<WebCore::BackForwardItemIdentifier>&&)>&&);
    void backForwardListCounts(Messages::WebPageProxy::BackForwardListCountsDelayedReply&&);
    void backForwardClear();

    // Undo management
    void registerEditCommandForUndo(WebUndoStepID commandID, const String& label);
    void registerInsertionUndoGrouping();
    void clearAllEditCommands();
    void canUndoRedo(UndoOrRedo, CompletionHandler<void(bool)>&&);
    void executeUndoRedo(UndoOrRedo, CompletionHandler<void()>&&);

    // Keyboard handling
#if PLATFORM(COCOA)
    void executeSavedCommandBySelector(const String& selector, CompletionHandler<void(bool)>&&);
#endif

#if PLATFORM(GTK)
    void getEditorCommandsForKeyEvent(const AtomString&, Vector<String>&);
#endif

#if USE(ATK)
    void bindAccessibilityTree(const String&);
    void showEmojiPicker(const WebCore::IntRect&, CompletionHandler<void(String)>&&);
#endif

    // Popup Menu.
    void showPopupMenu(const WebCore::IntRect& rect, uint64_t textDirection, const Vector<WebPopupItem>& items, int32_t selectedIndex, const PlatformPopupMenuData&);
    void hidePopupMenu();

#if ENABLE(CONTEXT_MENUS)
    void showContextMenu(ContextMenuContextData&&, const UserData&);
#endif

#if ENABLE(TELEPHONE_NUMBER_DETECTION)
#if PLATFORM(MAC)
    void showTelephoneNumberMenu(const String& telephoneNumber, const WebCore::IntPoint&);
#endif
#endif

    // Search popup results
    void saveRecentSearches(const String&, const Vector<WebCore::RecentSearch>&);
    void loadRecentSearches(const String&, CompletionHandler<void(Vector<WebCore::RecentSearch>&&)>&&);

#if PLATFORM(COCOA)
    // Speech.
    void getIsSpeaking(CompletionHandler<void(bool)>&&);
    void speak(const String&);
    void stopSpeaking();

    // Spotlight.
    void searchWithSpotlight(const String&);
        
    void searchTheWeb(const String&);

    // Dictionary.
    void didPerformDictionaryLookup(const WebCore::DictionaryPopupInfo&);
#endif

    // Spelling and grammar.
    void checkSpellingOfString(const String& text, CompletionHandler<void(int32_t misspellingLocation, int32_t misspellingLength)>&&);
    void checkGrammarOfString(const String& text, CompletionHandler<void(Vector<WebCore::GrammarDetail>&&, int32_t badGrammarLocation, int32_t badGrammarLength)>&&);
    void spellingUIIsShowing(CompletionHandler<void(bool)>&&);
    void updateSpellingUIWithMisspelledWord(const String& misspelledWord);
    void updateSpellingUIWithGrammarString(const String& badGrammarPhrase, const WebCore::GrammarDetail&);
    void learnWord(const String& word);
    void ignoreWord(const String& word);
    void requestCheckingOfString(uint64_t requestID, const WebCore::TextCheckingRequestData&, int32_t insertionPoint);

    void takeFocus(uint8_t direction);
    void setToolTip(const String&);
    void setCursor(const WebCore::Cursor&);
    void setCursorHiddenUntilMouseMoves(bool);

    void discardQueuedMouseEvents();

    void didReceiveEvent(uint32_t opaqueType, bool handled);

    void voidCallback(CallbackID);
    void dataCallback(const IPC::DataReference&, CallbackID);
    void imageCallback(const ShareableBitmap::Handle&, CallbackID);
    void boolCallback(bool result, CallbackID);
    void stringCallback(const String&, CallbackID);
    void invalidateStringCallback(CallbackID);
    void computedPagesCallback(const Vector<WebCore::IntRect>&, double totalScaleFactorForPrinting, const WebCore::FloatBoxExtent& computedPageMargin, CallbackID);
    void unsignedCallback(uint64_t, CallbackID);
#if ENABLE(APPLICATION_MANIFEST)
    void applicationManifestCallback(const Optional<WebCore::ApplicationManifest>&, CallbackID);
#endif
#if PLATFORM(MAC)
    void fontAtSelectionCallback(const FontInfo&, double, bool, CallbackID);
#endif
#if PLATFORM(IOS_FAMILY)
    void interpretKeyEvent(const EditorState&, bool isCharEvent, CompletionHandler<void(bool)>&&);
    void showPlaybackTargetPicker(bool hasVideo, const WebCore::IntRect& elementRect, WebCore::RouteSharingPolicy, const String&);

    void updateStringForFind(const String&);
#endif
#if PLATFORM(GTK)
    void printFinishedCallback(const WebCore::ResourceError&, CallbackID);
#endif

    void focusedFrameChanged(const Optional<WebCore::FrameIdentifier>&);

    void didFinishLoadingDataForCustomContentProvider(const String& suggestedFilename, const IPC::DataReference&);

#if PLATFORM(COCOA)
    void pluginFocusOrWindowFocusChanged(uint64_t pluginComplexTextInputIdentifier, bool pluginHasFocusAndWindowHasFocus);
    void setPluginComplexTextInputState(uint64_t pluginComplexTextInputIdentifier, uint64_t complexTextInputState);
#endif

#if USE(AUTOMATIC_TEXT_REPLACEMENT)
    void toggleSmartInsertDelete();
    void toggleAutomaticQuoteSubstitution();
    void toggleAutomaticLinkDetection();
    void toggleAutomaticDashSubstitution();
    void toggleAutomaticTextReplacement();
#endif

#if USE(DICTATION_ALTERNATIVES)
    void showDictationAlternativeUI(const WebCore::FloatRect& boundingBoxOfDictatedText, WebCore::DictationContext);
    void removeDictationAlternatives(WebCore::DictationContext);
    void dictationAlternatives(WebCore::DictationContext, CompletionHandler<void(Vector<String>&&)>&&);
#endif

#if PLATFORM(MAC)
    void substitutionsPanelIsShowing(CompletionHandler<void(bool)>&&);
    void showCorrectionPanel(int32_t panelType, const WebCore::FloatRect& boundingBoxOfReplacedString, const String& replacedString, const String& replacementString, const Vector<String>& alternativeReplacementStrings);
    void dismissCorrectionPanel(int32_t reason);
    void dismissCorrectionPanelSoon(int32_t reason, CompletionHandler<void(String)>&&);
    void recordAutocorrectionResponse(int32_t responseType, const String& replacedString, const String& replacementString);

    void setEditableElementIsFocused(bool);
#endif // PLATFORM(MAC)

#if PLATFORM(IOS_FAMILY)
    WebCore::FloatSize screenSize();
    WebCore::FloatSize availableScreenSize();
    WebCore::FloatSize overrideScreenSize();
    float textAutosizingWidth();

    void couldNotRestorePageState();
    void restorePageState(Optional<WebCore::FloatPoint> scrollPosition, const WebCore::FloatPoint& scrollOrigin, const WebCore::FloatBoxExtent& obscuredInsetsOnSave, double scale);
    void restorePageCenterAndScale(Optional<WebCore::FloatPoint>, double scale);

    void didGetTapHighlightGeometries(uint64_t requestID, const WebCore::Color& color, const Vector<WebCore::FloatQuad>& geometries, const WebCore::IntSize& topLeftRadius, const WebCore::IntSize& topRightRadius, const WebCore::IntSize& bottomLeftRadius, const WebCore::IntSize& bottomRightRadius, bool nodeHasBuiltInClickHandling);

    void elementDidFocus(const FocusedElementInformation&, bool userIsInteracting, bool blurPreviousNode, OptionSet<WebCore::ActivityState::Flag> activityStateChanges, const UserData&);
    void elementDidBlur();
    void updateInputContextAfterBlurringAndRefocusingElement();
    void focusedElementDidChangeInputMode(WebCore::InputMode);
    void didReleaseAllTouchPoints();
    void didUpdateEditorState();

    void showInspectorHighlight(const WebCore::InspectorOverlay::Highlight&);
    void hideInspectorHighlight();

    void enableInspectorNodeSearch();
    void disableInspectorNodeSearch();
#else
    void didReleaseAllTouchPoints() { }
#endif // PLATFORM(IOS_FAMILY)

#if ENABLE(DATA_DETECTION)
    RetainPtr<NSArray> m_dataDetectionResults;
#endif

    void clearLoadDependentCallbacks();

    void performDragControllerAction(DragControllerAction, WebCore::DragData&, const String& dragStorageName, SandboxExtension::Handle&&, SandboxExtension::HandleArray&&);

    void updateBackingStoreDiscardableState();

    void setRenderTreeSize(uint64_t treeSize) { m_renderTreeSize = treeSize; }

    void sendWheelEvent(const WebWheelEvent&);

    WebWheelEventCoalescer& wheelEventCoalescer();

#if ENABLE(TOUCH_EVENTS)
    void updateTouchEventTracking(const WebTouchEvent&);
    WebCore::TrackingType touchEventTrackingType(const WebTouchEvent&) const;
#endif

#if ENABLE(NETSCAPE_PLUGIN_API)
    void findPlugin(const String& mimeType, const String& urlString, const String& frameURLString, const String& pageURLString, bool allowOnlyApplicationPlugins, Messages::WebPageProxy::FindPluginDelayedReply&&);
#endif

#if USE(QUICK_LOOK)
    void didStartLoadForQuickLookDocumentInMainFrame(const String& fileName, const String& uti);
    void didFinishLoadForQuickLookDocumentInMainFrame(const ShareableResource::Handle&);
    void requestPasswordForQuickLookDocumentInMainFrame(const String& fileName, CompletionHandler<void(const String&)>&&);
#endif

#if ENABLE(CONTENT_FILTERING)
    void contentFilterDidBlockLoadForFrame(const WebCore::ContentFilterUnblockHandler&, WebCore::FrameIdentifier);
#endif

    void tryReloadAfterProcessTermination();
    void resetRecentCrashCountSoon();
    void resetRecentCrashCount();

    API::DiagnosticLoggingClient* effectiveDiagnosticLoggingClient(WebCore::ShouldSample);

    void dispatchActivityStateChange();
    void viewDidLeaveWindow();
    void viewDidEnterWindow();

#if PLATFORM(MAC)
    void didPerformImmediateActionHitTest(const WebHitTestResultData&, bool contentPreventsDefault, const UserData&);
#endif

    void useFixedLayoutDidChange(bool useFixedLayout) { m_useFixedLayout = useFixedLayout; }
    void fixedLayoutSizeDidChange(WebCore::IntSize fixedLayoutSize) { m_fixedLayoutSize = fixedLayoutSize; }

    void imageOrMediaDocumentSizeChanged(const WebCore::IntSize&);
#if ENABLE(VIDEO) && USE(GSTREAMER)
    void requestInstallMissingMediaPlugins(const String& details, const String& description);
#endif

    void startURLSchemeTask(URLSchemeTaskParameters&&);
    void stopURLSchemeTask(uint64_t handlerIdentifier, uint64_t taskIdentifier);
    void loadSynchronousURLSchemeTask(URLSchemeTaskParameters&&, Messages::WebPageProxy::LoadSynchronousURLSchemeTaskDelayedReply&&);

    bool checkURLReceivedFromCurrentOrPreviousWebProcess(WebProcessProxy&, const String&);
    bool checkURLReceivedFromCurrentOrPreviousWebProcess(WebProcessProxy&, const URL&);
    void willAcquireUniversalFileReadSandboxExtension(WebProcessProxy&);

    void handleAutoFillButtonClick(const UserData&);

    void didResignInputElementStrongPasswordAppearance(const UserData&);

    void handleMessage(IPC::Connection&, const String& messageName, const UserData& messageBody);
    void handleSynchronousMessage(IPC::Connection&, const String& messageName, const UserData& messageBody, CompletionHandler<void(UserData&&)>&&);

    void viewIsBecomingVisible();

    void stopAllURLSchemeTasks(WebProcessProxy* = nullptr);

#if ENABLE(ATTACHMENT_ELEMENT)
    void registerAttachmentIdentifierFromData(const String&, const String& contentType, const String& preferredFileName, const IPC::SharedBufferCopy&);
    void registerAttachmentIdentifierFromFilePath(const String&, const String& contentType, const String& filePath);
    void registerAttachmentsFromSerializedData(Vector<WebCore::SerializedAttachmentData>&&);
    void cloneAttachmentData(const String& fromIdentifier, const String& toIdentifier);

    void platformRegisterAttachment(Ref<API::Attachment>&&, const String& preferredFileName, const IPC::SharedBufferCopy&);
    void platformRegisterAttachment(Ref<API::Attachment>&&, const String& filePath);
    void platformCloneAttachment(Ref<API::Attachment>&& fromAttachment, Ref<API::Attachment>&& toAttachment);

    void didInsertAttachmentWithIdentifier(const String& identifier, const String& source, bool hasEnclosingImage);
    void didRemoveAttachmentWithIdentifier(const String& identifier);
    void didRemoveAttachment(API::Attachment&);
    Ref<API::Attachment> ensureAttachment(const String& identifier);
    void invalidateAllAttachments();

    void writePromisedAttachmentToPasteboard(WebCore::PromisedAttachmentInfo&&);
#endif

    void reportPageLoadResult(const WebCore::ResourceError& = { });

    void continueNavigationInNewProcess(API::Navigation&, std::unique_ptr<SuspendedPageProxy>&&, Ref<WebProcessProxy>&&, ProcessSwapRequestedByClient, RefPtr<API::WebsitePolicies>&&);

    void setNeedsFontAttributes(bool);
    void updateFontAttributesAfterEditorStateChange();

    void didAttachToRunningProcess();

#if ENABLE(RESOURCE_LOAD_STATISTICS)
    void logFrameNavigation(const WebFrameProxy&, const URL& pageURL, const WebCore::ResourceRequest&, const URL& redirectURL, bool wasPotentiallyInitiatedByUser);
#endif

    // WebPaymentCoordinatorProxy::Client
#if ENABLE(APPLE_PAY)
    IPC::Connection* paymentCoordinatorConnection(const WebPaymentCoordinatorProxy&) final;
    const String& paymentCoordinatorBoundInterfaceIdentifier(const WebPaymentCoordinatorProxy&) final;
    const String& paymentCoordinatorSourceApplicationBundleIdentifier(const WebPaymentCoordinatorProxy&) final;
    const String& paymentCoordinatorSourceApplicationSecondaryIdentifier(const WebPaymentCoordinatorProxy&) final;
    void paymentCoordinatorAddMessageReceiver(WebPaymentCoordinatorProxy&, IPC::ReceiverName, IPC::MessageReceiver&) final;
    void paymentCoordinatorRemoveMessageReceiver(WebPaymentCoordinatorProxy&, IPC::ReceiverName) final;
#endif
#if ENABLE(APPLE_PAY) && PLATFORM(IOS_FAMILY)
    UIViewController *paymentCoordinatorPresentingViewController(const WebPaymentCoordinatorProxy&) final;
    const String& paymentCoordinatorCTDataConnectionServiceType(const WebPaymentCoordinatorProxy&) final;
    std::unique_ptr<PaymentAuthorizationPresenter> paymentCoordinatorAuthorizationPresenter(WebPaymentCoordinatorProxy&, PKPaymentRequest *) final;
#endif
#if ENABLE(APPLE_PAY) && PLATFORM(MAC)
    NSWindow *paymentCoordinatorPresentingWindow(const WebPaymentCoordinatorProxy&) final;
#endif

#if ENABLE(SPEECH_SYNTHESIS)
    void didStartSpeaking(WebCore::PlatformSpeechSynthesisUtterance&) override;
    void didFinishSpeaking(WebCore::PlatformSpeechSynthesisUtterance&) override;
    void didPauseSpeaking(WebCore::PlatformSpeechSynthesisUtterance&) override;
    void didResumeSpeaking(WebCore::PlatformSpeechSynthesisUtterance&) override;
    void speakingErrorOccurred(WebCore::PlatformSpeechSynthesisUtterance&) override;
    void boundaryEventOccurred(WebCore::PlatformSpeechSynthesisUtterance&, WebCore::SpeechBoundary, unsigned charIndex) override;
    void voicesDidChange() override;

    struct SpeechSynthesisData;
    SpeechSynthesisData& speechSynthesisData();
    void resetSpeechSynthesizer();
#endif

#if PLATFORM(IOS_FAMILY)
    static bool isInHardwareKeyboardMode();
    void clearAudibleActivity();
#endif

    void tryCloseTimedOut();
    void makeStorageSpaceRequest(WebCore::FrameIdentifier, const String& originIdentifier, const String& databaseName, const String& displayName, uint64_t currentQuota, uint64_t currentOriginUsage, uint64_t currentDatabaseUsage, uint64_t expectedUsage, CompletionHandler<void(uint64_t)>&&);
        
#if ENABLE(APP_BOUND_DOMAINS)
    bool setIsNavigatingToAppBoundDomainAndCheckIfPermitted(bool isMainFrame, const URL&, Optional<NavigatingToAppBoundDomain>);
#endif

    static SandboxExtension::HandleArray createNetworkExtensionsSandboxExtensions(WebProcessProxy&);

    const Identifier m_identifier;
    WebCore::PageIdentifier m_webPageID;
    WeakPtr<PageClient> m_pageClient;
    Ref<API::PageConfiguration> m_configuration;

    std::unique_ptr<API::LoaderClient> m_loaderClient;
    std::unique_ptr<API::PolicyClient> m_policyClient;
    UniqueRef<API::NavigationClient> m_navigationClient;
    UniqueRef<API::HistoryClient> m_historyClient;
    std::unique_ptr<API::IconLoadingClient> m_iconLoadingClient;
    std::unique_ptr<API::FormClient> m_formClient;
    std::unique_ptr<API::UIClient> m_uiClient;
    std::unique_ptr<API::FindClient> m_findClient;
    std::unique_ptr<API::FindMatchesClient> m_findMatchesClient;
    std::unique_ptr<API::DiagnosticLoggingClient> m_diagnosticLoggingClient;
    std::unique_ptr<API::ResourceLoadClient> m_resourceLoadClient;
#if ENABLE(CONTEXT_MENUS)
    std::unique_ptr<API::ContextMenuClient> m_contextMenuClient;
#endif
    std::unique_ptr<WebPageInjectedBundleClient> m_injectedBundleClient;
    std::unique_ptr<PageLoadState::Observer> m_pageLoadStateObserver;

    std::unique_ptr<WebNavigationState> m_navigationState;
    String m_failingProvisionalLoadURL;
    bool m_isLoadingAlternateHTMLStringForFailingProvisionalLoad { false };

    std::unique_ptr<DrawingAreaProxy> m_drawingArea;
#if PLATFORM(COCOA)
    std::unique_ptr<RemoteLayerTreeHost> m_frozenRemoteLayerTreeHost;
#if ENABLE(ASYNC_SCROLLING)
    std::unique_ptr<RemoteScrollingCoordinatorProxy> m_scrollingCoordinatorProxy;
#endif
#endif
    Ref<WebProcessProxy> m_process;
    Ref<WebPageGroup> m_pageGroup;
    Ref<WebPreferences> m_preferences;

    Ref<WebUserContentControllerProxy> m_userContentController;
    Ref<VisitedLinkStore> m_visitedLinkStore;
    Ref<WebsiteDataStore> m_websiteDataStore;

    RefPtr<WebFrameProxy> m_mainFrame;

    RefPtr<WebFrameProxy> m_focusedFrame;

    String m_userAgent;
    String m_applicationNameForUserAgent;
    String m_applicationNameForDesktopUserAgent;
    String m_customUserAgent;
    String m_customTextEncodingName;
    String m_overrideContentSecurityPolicy;

    RefPtr<WebInspectorProxy> m_inspector;

#if ENABLE(FULLSCREEN_API)
    std::unique_ptr<WebFullScreenManagerProxy> m_fullScreenManager;
    std::unique_ptr<API::FullscreenClient> m_fullscreenClient;
#endif

#if ENABLE(VIDEO_PRESENTATION_MODE)
    RefPtr<PlaybackSessionManagerProxy> m_playbackSessionManager;
    RefPtr<VideoFullscreenManagerProxy> m_videoFullscreenManager;
    bool m_mockVideoPresentationModeEnabled { false };
#endif

#if ENABLE(MEDIA_USAGE)
    std::unique_ptr<MediaUsageManager> m_mediaUsageManager;
#endif

#if PLATFORM(IOS_FAMILY)
    Optional<WebCore::InputMode> m_pendingInputModeChange;
    TransactionID m_firstLayerTreeTransactionIdAfterDidCommitLoad;
    int32_t m_deviceOrientation { 0 };
    bool m_hasReceivedLayerTreeTransactionAfterDidCommitLoad { true };
    bool m_hasNetworkRequestsOnSuspended { false };
    bool m_isKeyboardAnimatingIn { false };
    bool m_isScrollingOrZooming { false };
#endif

#if ENABLE(UI_SIDE_COMPOSITING)
    VisibleContentRectUpdateInfo m_lastVisibleContentRectUpdate;
#endif

#if PLATFORM(MAC)
    bool m_useSystemAppearance { false };
#endif

#if ENABLE(APPLE_PAY)
    std::unique_ptr<WebPaymentCoordinatorProxy> m_paymentCoordinator;
#endif

#if USE(SYSTEM_PREVIEW)
    std::unique_ptr<SystemPreviewController> m_systemPreviewController;
#endif

#if ENABLE(WEB_AUTHN)
    std::unique_ptr<WebAuthenticatorCoordinatorProxy> m_credentialsMessenger;
#endif

    CallbackMap m_callbacks;
    HashSet<CallbackID> m_loadDependentStringCallbackIDs;

    HashSet<WebEditCommandProxy*> m_editCommandSet;

#if PLATFORM(COCOA)
    HashSet<String> m_knownKeypressCommandNames;
#endif

    RefPtr<WebPopupMenuProxy> m_activePopupMenu;
#if ENABLE(CONTEXT_MENUS)
    RefPtr<WebContextMenuProxy> m_activeContextMenu;
    ContextMenuContextData m_activeContextMenuContextData;
#endif
    RefPtr<API::HitTestResult> m_lastMouseMoveHitTestResult;

    RefPtr<WebOpenPanelResultListenerProxy> m_openPanelResultListener;
    GeolocationPermissionRequestManagerProxy m_geolocationPermissionRequestManager;
    NotificationPermissionRequestManagerProxy m_notificationPermissionRequestManager;

#if ENABLE(MEDIA_STREAM)
    std::unique_ptr<UserMediaPermissionRequestManagerProxy> m_userMediaPermissionRequestManager;
#endif

    OptionSet<WebCore::ActivityState::Flag> m_activityState;
    bool m_viewWasEverInWindow { false };
#if PLATFORM(MACCATALYST)
    bool m_isListeningForUserFacingStateChangeNotification { false };
#endif
#if PLATFORM(IOS_FAMILY)
    bool m_allowsMediaDocumentInlinePlayback { false };
    std::unique_ptr<ProcessThrottler::ForegroundActivity> m_isVisibleActivity;
    std::unique_ptr<ProcessThrottler::ForegroundActivity> m_isAudibleActivity;
    std::unique_ptr<ProcessThrottler::ForegroundActivity> m_isCapturingActivity;
    RunLoop::Timer<WebPageProxy> m_audibleActivityTimer;
    std::unique_ptr<ProcessThrottler::BackgroundActivity> m_openingAppLinkActivity;
#endif
    bool m_initialCapitalizationEnabled { false };
    Optional<double> m_cpuLimit;
    Ref<WebBackForwardList> m_backForwardList;
        
    bool m_maintainsInactiveSelection { false };

    bool m_waitsForPaintAfterViewDidMoveToWindow { false };
    bool m_shouldSkipWaitingForPaintAfterNextViewDidMoveToWindow { false };

    String m_toolTip;

    EditorState m_editorState;
    bool m_isEditable { false };

#if HAVE(TOUCH_BAR)
    TouchBarMenuData m_touchBarMenuData;
#endif

    double m_textZoomFactor { 1 };
    double m_pageZoomFactor { 1 };
    double m_pageScaleFactor { 1 };
    double m_pluginZoomFactor { 1 };
    double m_pluginScaleFactor { 1 };
    double m_viewScaleFactor { 1 };
    float m_intrinsicDeviceScaleFactor { 1 };
    Optional<float> m_customDeviceScaleFactor;
    float m_topContentInset { 0 };

    LayerHostingMode m_layerHostingMode { LayerHostingMode::InProcess };

    WebCore::Color m_underlayColor;
    WebCore::Color m_pageExtendedBackgroundColor;

    bool m_useFixedLayout { false };
    WebCore::IntSize m_fixedLayoutSize;
    Optional<WebCore::FloatRect> m_viewExposedRect;

    bool m_alwaysShowsHorizontalScroller { false };
    bool m_alwaysShowsVerticalScroller { false };

    OptionSet<WebCore::LayoutMilestone> m_observedLayoutMilestones;

    bool m_suppressScrollbarAnimations { false };

    WebCore::Pagination::Mode m_paginationMode { WebCore::Pagination::Unpaginated };
    bool m_paginationBehavesLikeColumns { false };
    double m_pageLength { 0 };
    double m_gapBetweenPages { 0 };
    bool m_paginationLineGridEnabled { false };
        
    // If the process backing the web page is alive and kicking.
    bool m_hasRunningProcess { false };

    // Whether WebPageProxy::close() has been called on this page.
    bool m_isClosed { false };

    // Whether it can run modal child web pages.
    bool m_canRunModal { false };

    bool m_isInPrintingMode { false };
    bool m_isPerformingDOMPrintOperation { false };

    WebCore::ResourceRequest m_decidePolicyForResponseRequest;
    bool m_shouldSuppressAppLinksInNextNavigationPolicyDecision { false };

#if HAVE(APP_SSO)
    bool m_shouldSuppressSOAuthorizationInNextNavigationPolicyDecision { false };
    bool m_shouldSuppressSOAuthorizationInAllNavigationPolicyDecision { false };
#endif

    std::unique_ptr<WebWheelEventCoalescer> m_wheelEventCoalescer;

    Deque<NativeWebMouseEvent> m_mouseEventQueue;
    Deque<NativeWebKeyboardEvent> m_keyEventQueue;
#if ENABLE(MAC_GESTURE_EVENTS)
    Deque<NativeWebGestureEvent> m_gestureEventQueue;
#endif
    Vector<WTF::Function<void ()>> m_callbackHandlersAfterProcessingPendingMouseEvents;

#if ENABLE(TOUCH_EVENTS)
    struct TouchEventTracking {
        WebCore::TrackingType touchForceChangedTracking { WebCore::TrackingType::NotTracking };
        WebCore::TrackingType touchStartTracking { WebCore::TrackingType::NotTracking };
        WebCore::TrackingType touchMoveTracking { WebCore::TrackingType::NotTracking };
        WebCore::TrackingType touchEndTracking { WebCore::TrackingType::NotTracking };

        bool isTrackingAnything() const
        {
            return touchForceChangedTracking != WebCore::TrackingType::NotTracking
                || touchStartTracking != WebCore::TrackingType::NotTracking
                || touchMoveTracking != WebCore::TrackingType::NotTracking
                || touchEndTracking != WebCore::TrackingType::NotTracking;
        }

        void reset()
        {
            touchForceChangedTracking = WebCore::TrackingType::NotTracking;
            touchStartTracking = WebCore::TrackingType::NotTracking;
            touchMoveTracking = WebCore::TrackingType::NotTracking;
            touchEndTracking = WebCore::TrackingType::NotTracking;
        }
    };
    TouchEventTracking m_touchAndPointerEventTracking;
#endif
#if ENABLE(TOUCH_EVENTS) && !ENABLE(IOS_TOUCH_EVENTS)
    Deque<QueuedTouchEvents> m_touchEventQueue;
#endif

    bool m_handledSynchronousTouchEventWhileDispatchingPreventableTouchStart { false };
    uint64_t m_handlingPreventableTouchStartCount { 0 };

#if ENABLE(INPUT_TYPE_COLOR)
    RefPtr<WebColorPicker> m_colorPicker;
#endif
#if ENABLE(DATALIST_ELEMENT)
    RefPtr<WebDataListSuggestionsDropdown> m_dataListSuggestionsDropdown;
#endif
#if ENABLE(DATE_AND_TIME_INPUT_TYPES)
    RefPtr<WebDateTimePicker> m_dateTimePicker;
#endif
#if PLATFORM(COCOA)
    RefPtr<WebCore::ValidationBubble> m_validationBubble;
#endif

    bool m_isPageSuspended { false };
    bool m_addsVisitedLinks { true };

    bool m_controlledByAutomation { false };

    unsigned m_inspectorFrontendCount { 0 };

#if PLATFORM(COCOA)
    bool m_isSmartInsertDeleteEnabled { false };
#endif

    Optional<WebCore::Color> m_backgroundColor;

    unsigned m_pendingLearnOrIgnoreWordMessageCount { 0 };

    bool m_mainFrameHasCustomContentProvider { false };

#if ENABLE(DRAG_SUPPORT)
    // Current drag destination details are delivered as an asynchronous response,
    // so we preserve them to be used when the next dragging delegate call is made.
    Optional<WebCore::DragOperation> m_currentDragOperation;
    WebCore::DragHandlingMethod m_currentDragHandlingMethod { WebCore::DragHandlingMethod::None };
    bool m_currentDragIsOverFileInput { false };
    unsigned m_currentDragNumberOfFilesToBeAccepted { 0 };
    WebCore::IntRect m_currentDragCaretRect;
    WebCore::IntRect m_currentDragCaretEditableElementRect;
#endif

    PageLoadState m_pageLoadState;
    
    bool m_delegatesScrolling { false };

    bool m_mainFrameHasHorizontalScrollbar { false };
    bool m_mainFrameHasVerticalScrollbar { false };

    // Whether horizontal wheel events can be handled directly for swiping purposes.
    bool m_canShortCircuitHorizontalWheelEvents { true };

    bool m_mainFrameIsPinnedToLeftSide { true };
    bool m_mainFrameIsPinnedToRightSide { true };
    bool m_mainFrameIsPinnedToTopSide { true };
    bool m_mainFrameIsPinnedToBottomSide { true };

    bool m_shouldUseImplicitRubberBandControl { false };
    bool m_rubberBandsAtLeft { true };
    bool m_rubberBandsAtRight { true };
    bool m_rubberBandsAtTop { true };
    bool m_rubberBandsAtBottom { true };
        
    bool m_enableVerticalRubberBanding { true };
    bool m_enableHorizontalRubberBanding { true };

    bool m_backgroundExtendsBeyondPage { true };

    bool m_shouldRecordNavigationSnapshots { false };
    bool m_isShowingNavigationGestureSnapshot { false };

    bool m_mainFramePluginHandlesPageScaleGesture { false };

    unsigned m_pageCount { 0 };

    WebCore::IntRect m_visibleScrollerThumbRect;

    uint64_t m_renderTreeSize { 0 };
    uint64_t m_sessionRestorationRenderTreeSize { 0 };
    bool m_hitRenderTreeSizeThreshold { false };

    bool m_suppressVisibilityUpdates { false };
    bool m_autoSizingShouldExpandToViewHeight { false };
    WebCore::IntSize m_minimumSizeForAutoLayout;
    WebCore::IntSize m_sizeToContentAutoSizeMaximumSize;

    Optional<WebCore::IntSize> m_viewportSizeForCSSViewportUnits;

    // Visual viewports
    WebCore::LayoutSize m_baseLayoutViewportSize;
    WebCore::LayoutPoint m_minStableLayoutViewportOrigin;
    WebCore::LayoutPoint m_maxStableLayoutViewportOrigin;

    float m_mediaVolume { 1 };
    WebCore::MediaProducer::MutedStateFlags m_mutedState { WebCore::MediaProducer::NoneMuted };
    bool m_mayStartMediaWhenInWindow { true };
    bool m_mediaPlaybackIsSuspended { false };
    bool m_mediaCaptureEnabled { true };

    bool m_waitingForDidUpdateActivityState { false };

    bool m_shouldScaleViewToFitDocument { false };
    bool m_shouldSuppressNextAutomaticNavigationSnapshot { false };

#if PLATFORM(COCOA)
    using TemporaryPDFFileMap = HashMap<String, String>;
    TemporaryPDFFileMap m_temporaryPDFFiles;
    std::unique_ptr<WebCore::RunLoopObserver> m_activityStateChangeDispatcher;

    std::unique_ptr<RemoteLayerTreeScrollingPerformanceData> m_scrollingPerformanceData;
    bool m_scrollPerformanceDataCollectionEnabled { false };

    bool m_hasScheduledActivityStateUpdate { false };
    Vector<CompletionHandler<void()>> m_activityStateUpdateCallbacks;
#endif
    UserObservablePageCounter::Token m_pageIsUserObservableCount;
    ProcessSuppressionDisabledToken m_preventProcessSuppressionCount;
    HiddenPageThrottlingAutoIncreasesCounter::Token m_hiddenPageDOMTimerThrottlingAutoIncreasesCount;
    VisibleWebPageToken m_visiblePageToken;
        
    WebCore::ScrollPinningBehavior m_scrollPinningBehavior { WebCore::DoNotPin };
    Optional<WebCore::ScrollbarOverlayStyle> m_scrollbarOverlayStyle;

    ActivityStateChangeID m_currentActivityStateChangeID { ActivityStateChangeAsynchronous };

    OptionSet<WebCore::ActivityState::Flag> m_potentiallyChangedActivityStateFlags;
    bool m_activityStateChangeWantsSynchronousReply { false };
    Vector<CallbackID> m_nextActivityStateChangeCallbacks;

    WebCore::MediaProducer::MediaStateFlags m_mediaState { WebCore::MediaProducer::IsNotPlaying };

    // To make sure capture indicators are visible long enough, m_reportedMediaCaptureState is the same as m_mediaState except that we might delay a bit transition from capturing to not-capturing.
    WebCore::MediaProducer::MediaStateFlags m_reportedMediaCaptureState { WebCore::MediaProducer::IsNotPlaying };
    RunLoop::Timer<WebPageProxy> m_updateReportedMediaCaptureStateTimer;
    static constexpr Seconds DefaultMediaCaptureReportingDelay { 3_s };
    Seconds m_mediaCaptureReportingDelay { DefaultMediaCaptureReportingDelay };

    bool m_hasHadSelectionChangesFromUserInteraction { false };

#if HAVE(TOUCH_BAR)
    bool m_isTouchBarUpdateSupressedForHiddenContentEditable { false };
    bool m_isNeverRichlyEditableForTouchBar { false };
#endif

#if ENABLE(WIRELESS_PLAYBACK_TARGET) && !PLATFORM(IOS_FAMILY)
    bool m_requiresTargetMonitoring { false };
#endif

#if ENABLE(META_VIEWPORT)
    bool m_forceAlwaysUserScalable { false };
    WebCore::FloatSize m_viewportConfigurationViewLayoutSize;
    double m_viewportConfigurationLayoutSizeScaleFactor { 1 };
    double m_viewportConfigurationMinimumEffectiveDeviceWidth { 0 };
    Optional<WebCore::ViewportArguments> m_overrideViewportArguments;
#endif

#if PLATFORM(IOS_FAMILY)
    Function<bool()> m_deviceOrientationUserPermissionHandlerForTesting;
    bool m_waitingForPostLayoutEditorStateUpdateAfterFocusingElement { false };
    WebCore::FloatSize m_maximumUnobscuredSize;
    bool m_lastObservedStateWasBackground { false };
#endif

    Optional<WebCore::FontAttributes> m_cachedFontAttributesAtSelectionStart;

#if ENABLE(POINTER_LOCK)
    bool m_isPointerLockPending { false };
    bool m_isPointerLocked { false };
#endif

    bool m_isUsingHighPerformanceWebGL { false };
    bool m_openedByDOM { false };
    bool m_hasCommittedAnyProvisionalLoads { false };
    bool m_preferFasterClickOverDoubleTap { false };

    HashMap<String, Ref<WebURLSchemeHandler>> m_urlSchemeHandlersByScheme;
    HashMap<uint64_t, Ref<WebURLSchemeHandler>> m_urlSchemeHandlersByIdentifier;

#if ENABLE(ATTACHMENT_ELEMENT)
    using IdentifierToAttachmentMap = HashMap<String, Ref<API::Attachment>>;
    IdentifierToAttachmentMap m_attachmentIdentifierToAttachmentMap;
#endif

    const std::unique_ptr<WebPageInspectorController> m_inspectorController;
#if ENABLE(REMOTE_INSPECTOR)
    std::unique_ptr<WebPageDebuggable> m_inspectorDebuggable;
#endif

    Optional<SpellDocumentTag> m_spellDocumentTag;

    Optional<MonotonicTime> m_pageLoadStart;
    HashSet<String> m_previouslyVisitedPaths;

    RunLoop::Timer<WebPageProxy> m_resetRecentCrashCountTimer;
    unsigned m_recentCrashCount { 0 };

    bool m_needsFontAttributes { false };
    bool m_mayHaveUniversalFileReadSandboxExtension { false };

    RunLoop::Timer<WebPageProxy> m_tryCloseTimeoutTimer;

    std::unique_ptr<ProvisionalPageProxy> m_provisionalPage;
    std::unique_ptr<SuspendedPageProxy> m_suspendedPageKeptToPreventFlashing;
    WeakPtr<SuspendedPageProxy> m_lastSuspendedPage;

    TextManipulationItemCallback m_textManipulationItemCallback;

#if HAVE(VISIBILITY_PROPAGATION_VIEW)
    LayerHostingContextID m_contextIDForVisibilityPropagation { 0 };
#endif

    HashMap<WebViewDidMoveToWindowObserver*, WeakPtr<WebViewDidMoveToWindowObserver>> m_webViewDidMoveToWindowObservers;

    mutable RefPtr<Logger> m_logger;

#if ENABLE(SPEECH_SYNTHESIS)
    struct SpeechSynthesisData {
        std::unique_ptr<WebCore::PlatformSpeechSynthesizer> synthesizer;
        RefPtr<WebCore::PlatformSpeechSynthesisUtterance> utterance;
        CompletionHandler<void()> speakingStartedCompletionHandler;
        CompletionHandler<void()> speakingFinishedCompletionHandler;
        CompletionHandler<void()> speakingPausedCompletionHandler;
        CompletionHandler<void()> speakingResumedCompletionHandler;
    };
    Optional<SpeechSynthesisData> m_speechSynthesisData;
#endif

    std::unique_ptr<SpeechRecognitionPermissionManager> m_speechRecognitionPermissionManager;

#if USE(DIRECT2D)
    COMPtr<ID3D11Device1> m_device;
#endif
    bool m_sessionStateWasRestoredByAPIRequest { false };
    bool m_isQuotaIncreaseDenied { false };
    bool m_isLayerTreeFrozenDueToSwipeAnimation { false };
    
    String m_overriddenMediaType;

    Vector<String> m_corsDisablingPatterns;

    struct InjectedBundleMessage {
        String messageName;
        RefPtr<API::Object> messageBody;
    };
    Vector<InjectedBundleMessage> m_pendingInjectedBundleMessages;
        
#if PLATFORM(IOS_FAMILY) && ENABLE(DEVICE_ORIENTATION)
    std::unique_ptr<WebDeviceOrientationUpdateProviderProxy> m_webDeviceOrientationUpdateProviderProxy;
#endif

#if ENABLE(RESOURCE_LOAD_STATISTICS)
    MonotonicTime m_didFinishDocumentLoadForMainFrameTimestamp;
#endif
        
#if ENABLE(APP_BOUND_DOMAINS)
    Optional<NavigatingToAppBoundDomain> m_isNavigatingToAppBoundDomain;
    Optional<NavigatingToAppBoundDomain> m_isTopFrameNavigatingToAppBoundDomain;
    bool m_ignoresAppBoundDomains { false };
    bool m_limitsNavigationsToAppBoundDomains { false };
#endif

    bool m_userScriptsNotified { false };
    bool m_hasExecutedAppBoundBehaviorBeforeNavigation { false };
    bool m_canUseCredentialStorage { true };

    size_t m_suspendMediaPlaybackCounter { 0 };

    Optional<WebCore::PrivateClickMeasurement> m_privateClickMeasurement;
};

} // namespace WebKit