Unreviewed, fix iOS build with recent SDKs.
[WebKit-https.git] / Source / WebKit / UIProcess / API / Cocoa / WKWebView.mm
index 8dc30f1..23dbc7e 100644 (file)
 #import "config.h"
 #import "WKWebViewInternal.h"
 
-#if WK_API_ENABLED
-
 #import "APIFormClient.h"
 #import "APIPageConfiguration.h"
 #import "APISerializedScriptValue.h"
+#import "AttributedString.h"
 #import "CompletionHandlerCallChecker.h"
 #import "DiagnosticLoggingClient.h"
 #import "DynamicViewportSizeUpdate.h"
 #import "FindClient.h"
 #import "FrontBoardServicesSPI.h"
 #import "FullscreenClient.h"
+#import "GlobalFindInPageState.h"
 #import "IconLoadingDelegate.h"
 #import "LegacySessionStateCoding.h"
 #import "Logging.h"
+#import "MediaCaptureUtilities.h"
 #import "NavigationState.h"
 #import "ObjCObjectGraph.h"
 #import "PageClient.h"
+#import "ProvisionalPageProxy.h"
 #import "RemoteLayerTreeScrollingPerformanceData.h"
 #import "RemoteLayerTreeTransaction.h"
 #import "RemoteObjectRegistry.h"
 #import "RemoteObjectRegistryMessages.h"
 #import "SafeBrowsingWarning.h"
-#import "StringUtilities.h"
+#import "TextInputContext.h"
 #import "UIDelegate.h"
 #import "UserMediaProcessManager.h"
 #import "VersionChecks.h"
@@ -75,6 +77,7 @@
 #import "WKUserContentControllerInternal.h"
 #import "WKWebViewConfigurationInternal.h"
 #import "WKWebViewContentProvider.h"
+#import "WKWebpagePreferencesInternal.h"
 #import "WKWebsiteDataStoreInternal.h"
 #import "WebBackForwardList.h"
 #import "WebCertificateInfo.h"
@@ -96,6 +99,7 @@
 #import "_WKInspectorInternal.h"
 #import "_WKRemoteObjectRegistryInternal.h"
 #import "_WKSessionStateInternal.h"
+#import "_WKTextInputContextInternal.h"
 #import "_WKVisitedLinkStoreInternal.h"
 #import "_WKWebsitePoliciesInternal.h"
 #import <WebCore/GraphicsContextCG.h>
 #import <WebCore/SchemeRegistry.h>
 #import <WebCore/Settings.h>
 #import <WebCore/SharedBuffer.h>
+#import <WebCore/StringUtilities.h>
 #import <WebCore/ValidationBubble.h>
 #import <WebCore/ViewportArguments.h>
 #import <WebCore/WritingMode.h>
@@ -219,7 +224,7 @@ WKWebView* fromWebPageProxy(WebKit::WebPageProxy& page)
 }
 
 #if PLATFORM(MAC)
-static _WKOverlayScrollbarStyle toAPIScrollbarStyle(std::optional<WebCore::ScrollbarOverlayStyle> coreScrollbarStyle)
+static _WKOverlayScrollbarStyle toAPIScrollbarStyle(Optional<WebCore::ScrollbarOverlayStyle> coreScrollbarStyle)
 {
     if (!coreScrollbarStyle)
         return _WKOverlayScrollbarStyleAutomatic;
@@ -236,7 +241,7 @@ static _WKOverlayScrollbarStyle toAPIScrollbarStyle(std::optional<WebCore::Scrol
     return _WKOverlayScrollbarStyleAutomatic;
 }
 
-static std::optional<WebCore::ScrollbarOverlayStyle> toCoreScrollbarStyle(_WKOverlayScrollbarStyle scrollbarStyle)
+static Optional<WebCore::ScrollbarOverlayStyle> toCoreScrollbarStyle(_WKOverlayScrollbarStyle scrollbarStyle)
 {
     switch (scrollbarStyle) {
     case _WKOverlayScrollbarStyleDark:
@@ -248,7 +253,7 @@ static std::optional<WebCore::ScrollbarOverlayStyle> toCoreScrollbarStyle(_WKOve
     case _WKOverlayScrollbarStyleAutomatic:
         break;
     }
-    return std::nullopt;
+    return WTF::nullopt;
 }
 #endif
 
@@ -268,7 +273,7 @@ static std::optional<WebCore::ScrollbarOverlayStyle> toCoreScrollbarStyle(_WKOve
 
     WeakObjCPtr<id <_WKInputDelegate>> _inputDelegate;
 
-    std::optional<BOOL> _resolutionForShareSheetImmediateCompletionForTesting;
+    Optional<BOOL> _resolutionForShareSheetImmediateCompletionForTesting;
     RetainPtr<WKSafeBrowsingWarning> _safeBrowsingWarning;
 
 #if PLATFORM(IOS_FAMILY)
@@ -283,10 +288,10 @@ static std::optional<WebCore::ScrollbarOverlayStyle> toCoreScrollbarStyle(_WKOve
 
     BOOL _overridesViewLayoutSize;
     CGSize _viewLayoutSizeOverride;
-    std::optional<WebCore::FloatSize> _lastSentViewLayoutSize;
+    Optional<WebCore::FloatSize> _lastSentViewLayoutSize;
     BOOL _overridesMaximumUnobscuredSize;
     CGSize _maximumUnobscuredSizeOverride;
-    std::optional<WebCore::FloatSize> _lastSentMaximumUnobscuredSize;
+    Optional<WebCore::FloatSize> _lastSentMaximumUnobscuredSize;
     CGRect _inputViewBounds;
     CGFloat _viewportMetaTagWidth;
     BOOL _viewportMetaTagWidthWasExplicit;
@@ -307,7 +312,7 @@ static std::optional<WebCore::ScrollbarOverlayStyle> toCoreScrollbarStyle(_WKOve
 
     UIInterfaceOrientation _interfaceOrientationOverride;
     BOOL _overridesInterfaceOrientation;
-    std::optional<int32_t> _lastSentDeviceOrientation;
+    Optional<int32_t> _lastSentDeviceOrientation;
 
     BOOL _allowsViewportShrinkToFit;
 
@@ -320,15 +325,15 @@ static std::optional<WebCore::ScrollbarOverlayStyle> toCoreScrollbarStyle(_WKOve
     CGFloat _animatedResizeOriginalContentWidth;
     RetainPtr<UIView> _resizeAnimationView;
     CGFloat _lastAdjustmentForScroller;
-    std::optional<CGRect> _frozenVisibleContentRect;
-    std::optional<CGRect> _frozenUnobscuredContentRect;
+    Optional<CGRect> _frozenVisibleContentRect;
+    Optional<CGRect> _frozenUnobscuredContentRect;
 
     BOOL _commitDidRestoreScrollPosition;
-    std::optional<WebCore::FloatPoint> _scrollOffsetToRestore;
+    Optional<WebCore::FloatPoint> _scrollOffsetToRestore;
     WebCore::FloatBoxExtent _obscuredInsetsWhenSaved;
 
-    std::optional<WebCore::FloatPoint> _unobscuredCenterToRestore;
-    std::optional<uint64_t> _firstTransactionIDAfterPageRestore;
+    Optional<WebCore::FloatPoint> _unobscuredCenterToRestore;
+    Optional<uint64_t> _firstTransactionIDAfterPageRestore;
     double _scaleToRestore;
 
     std::unique_ptr<WebKit::ViewGestureController> _gestureController;
@@ -376,7 +381,7 @@ static std::optional<WebCore::ScrollbarOverlayStyle> toCoreScrollbarStyle(_WKOve
     std::unique_ptr<WebKit::WebViewImpl> _impl;
     RetainPtr<WKTextFinderClient> _textFinderClient;
 #endif
-    CGFloat _minimumEffectiveDeviceWidth;
+    _WKSelectionAttributes _selectionAttributes;
 }
 
 - (instancetype)initWithFrame:(CGRect)frame
@@ -386,7 +391,7 @@ static std::optional<WebCore::ScrollbarOverlayStyle> toCoreScrollbarStyle(_WKOve
 
 - (BOOL)_isValid
 {
-    return _page && _page->isValid();
+    return _page && _page->hasRunningProcess();
 }
 
 #if PLATFORM(IOS_FAMILY)
@@ -407,7 +412,9 @@ static int32_t deviceOrientationForUIInterfaceOrientation(UIInterfaceOrientation
 
 static int32_t deviceOrientation()
 {
+ALLOW_DEPRECATED_DECLARATIONS_BEGIN
     return deviceOrientationForUIInterfaceOrientation([[UIApplication sharedApplication] statusBarOrientation]);
+ALLOW_DEPRECATED_DECLARATIONS_END
 }
 
 - (BOOL)_isShowingVideoPictureInPicture
@@ -473,6 +480,10 @@ static bool shouldAllowSettingAnyXHRHeaderFromFileURLs()
 
 #endif
 
+#if USE(APPLE_INTERNAL_SDK)
+#include <WebKitAdditions/WKWebViewInternalAdditions.mm>
+#endif
+
 static bool shouldRequireUserGestureToLoadVideo()
 {
 #if PLATFORM(IOS_FAMILY)
@@ -543,6 +554,8 @@ static void validate(WKWebViewConfiguration *configuration)
         WKProcessPool *relatedWebViewProcessPool = [relatedWebView->_configuration processPool];
         if (processPool && processPool != relatedWebViewProcessPool)
             [NSException raise:NSInvalidArgumentException format:@"Related web view %@ has process pool %@ but configuration specifies a different process pool %@", relatedWebView, relatedWebViewProcessPool, configuration.processPool];
+        if ([relatedWebView->_configuration websiteDataStore] != [_configuration websiteDataStore] && linkedOnOrAfter(WebKit::SDKVersion::FirstWithExceptionsForRelatedWebViewsUsingDifferentDataStores, WebKit::AssumeSafariIsAlwaysLinkedOnAfter::No))
+            [NSException raise:NSInvalidArgumentException format:@"Related web view %@ has data store %@ but configuration specifies a different data store %@", relatedWebView, [relatedWebView->_configuration websiteDataStore], [_configuration websiteDataStore]];
 
         [_configuration setProcessPool:relatedWebViewProcessPool];
     }
@@ -562,6 +575,7 @@ static void validate(WKWebViewConfiguration *configuration)
     pageConfiguration->setUserContentController([_configuration userContentController]->_userContentControllerProxy.get());
     pageConfiguration->setVisitedLinkStore([_configuration _visitedLinkStore]->_visitedLinkStore.get());
     pageConfiguration->setWebsiteDataStore([_configuration websiteDataStore]->_websiteDataStore.get());
+    pageConfiguration->setDefaultWebsitePolicies([_configuration defaultWebpagePreferences]->_websitePolicies.get());
 
 #if PLATFORM(MAC)
     if (auto pageGroup = WebKit::toImpl([configuration _pageGroup])) {
@@ -575,12 +589,15 @@ static void validate(WKWebViewConfiguration *configuration)
             pageConfiguration->setPageGroup(WebKit::WebPageGroup::create(configuration._groupIdentifier).ptr());
     }
 
-    pageConfiguration->setAdditionalSupportedImageTypes(WebKit::webCoreStringVectorFromNSStringArray([_configuration _additionalSupportedImageTypes]));
+    pageConfiguration->setAdditionalSupportedImageTypes(WebCore::webCoreStringVectorFromNSStringArray([_configuration _additionalSupportedImageTypes]));
 
     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::suppressesIncrementalRenderingKey(), WebKit::WebPreferencesStore::Value(!![_configuration suppressesIncrementalRendering]));
 
     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::shouldRespectImageOrientationKey(), WebKit::WebPreferencesStore::Value(!![_configuration _respectsImageOrientation]));
+#if !PLATFORM(MAC)
+    // FIXME: Expose WKPreferences._shouldPrintBackgrounds on iOS, adopt it in all iOS clients, and remove this and WKWebViewConfiguration._printsBackgrounds.
     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::shouldPrintBackgroundsKey(), WebKit::WebPreferencesStore::Value(!![_configuration _printsBackgrounds]));
+#endif
     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::incrementalRenderingSuppressionTimeoutKey(), WebKit::WebPreferencesStore::Value([_configuration _incrementalRenderingSuppressionTimeout]));
     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::javaScriptMarkupEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _allowsJavaScriptMarkup]));
     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::shouldConvertPositionStyleOnCopyKey(), WebKit::WebPreferencesStore::Value(!![_configuration _convertsPositionStyleOnCopy]));
@@ -612,6 +629,10 @@ static void validate(WKWebViewConfiguration *configuration)
     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::userInterfaceDirectionPolicyKey(), WebKit::WebPreferencesStore::Value(static_cast<uint32_t>(WebCore::UserInterfaceDirectionPolicy::Content)));
     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::systemLayoutDirectionKey(), WebKit::WebPreferencesStore::Value(static_cast<uint32_t>(WebCore::TextDirection::LTR)));
     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::allowSettingAnyXHRHeaderFromFileURLsKey(), WebKit::WebPreferencesStore::Value(shouldAllowSettingAnyXHRHeaderFromFileURLs()));
+    pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::shouldDecidePolicyBeforeLoadingQuickLookPreviewKey(), WebKit::WebPreferencesStore::Value(!![_configuration _shouldDecidePolicyBeforeLoadingQuickLookPreview]));
+#if ENABLE(DEVICE_ORIENTATION)
+    pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::deviceOrientationPermissionAPIEnabledKey(), WebKit::WebPreferencesStore::Value(linkedOnOrAfter(WebKit::SDKVersion::FirstWithDeviceOrientationAndMotionPermissionAPI)));
+#endif
 #if USE(SYSTEM_PREVIEW)
     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::systemPreviewEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _systemPreviewEnabled]));
 #endif
@@ -644,6 +665,7 @@ static void validate(WKWebViewConfiguration *configuration)
     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::colorFilterEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _colorFilterEnabled]));
 
     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::editableImagesEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _editableImagesEnabled]));
+    pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::undoManagerAPIEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _undoManagerAPIEnabled]));
 
 #if ENABLE(LEGACY_ENCRYPTED_MEDIA)
     pageConfiguration->preferenceValues().set(WebKit::WebPreferencesKey::legacyEncryptedMediaAPIEnabledKey(), WebKit::WebPreferencesStore::Value(!![_configuration _legacyEncryptedMediaAPIEnabled]));
@@ -675,7 +697,8 @@ static void validate(WKWebViewConfiguration *configuration)
 
     _page = [_contentView page];
     [self _dispatchSetDeviceOrientation:deviceOrientation()];
-    _page->setDrawsBackground(self.opaque);
+    if (!self.opaque)
+        _page->setBackgroundColor(WebCore::Color(WebCore::Color::transparent));
 
     [_contentView layer].anchorPoint = CGPointZero;
     [_contentView setFrame:bounds];
@@ -1003,6 +1026,8 @@ static void validate(WKWebViewConfiguration *configuration)
 
 - (WKNavigation *)goBack
 {
+    if (self._safeBrowsingWarning)
+        return [self reload];
     return wrapper(_page->goBack());
 }
 
@@ -1127,6 +1152,9 @@ static WKErrorCode callbackErrorCode(WebKit::CallbackBase::Error error)
     bitmapSize.scale(deviceScale, deviceScale);
 
     // Software snapshot will not capture elements rendered with hardware acceleration (WebGL, video, etc).
+    // This code doesn't consider snapshotConfiguration.afterScreenUpdates since the software snapshot always
+    // contains recent updates. If we ever have a UI-side snapshot mechanism on macOS, we will need to factor
+    // in snapshotConfiguration.afterScreenUpdates at that time.
     _page->takeSnapshot(WebCore::enclosingIntRect(rectInViewCoordinates), bitmapSize, WebKit::SnapshotOptionsInViewCoordinates, [handler, snapshotWidth, imageHeight](const WebKit::ShareableBitmap::Handle& imageHandle, WebKit::CallbackBase::Error errorCode) {
         if (errorCode != WebKit::ScriptValueCallback::Error::None) {
             auto error = createNSError(callbackErrorCode(errorCode));
@@ -1134,7 +1162,7 @@ static WKErrorCode callbackErrorCode(WebKit::CallbackBase::Error error)
             return;
         }
 
-        RefPtr<WebKit::ShareableBitmap> bitmap = WebKit::ShareableBitmap::create(imageHandle, WebKit::SharedMemory::Protection::ReadOnly);
+        auto bitmap = WebKit::ShareableBitmap::create(imageHandle, WebKit::SharedMemory::Protection::ReadOnly);
         RetainPtr<CGImageRef> cgImage = bitmap ? bitmap->makeCGImage() : nullptr;
         RetainPtr<NSImage> nsImage = adoptNS([[NSImage alloc] initWithCGImage:cgImage.get() size:NSMakeSize(snapshotWidth, imageHeight)]);
         handler(nsImage.get(), nil);
@@ -1153,18 +1181,33 @@ static WKErrorCode callbackErrorCode(WebKit::CallbackBase::Error error)
 
     auto handler = makeBlockPtr(completionHandler);
     CGFloat deviceScale = _page->deviceScaleFactor();
+    RetainPtr<WKWebView> strongSelf = self;
+    auto callSnapshotRect = [strongSelf, rectInViewCoordinates, snapshotWidth, deviceScale, handler] {
+        [strongSelf _snapshotRect:rectInViewCoordinates intoImageOfWidth:(snapshotWidth * deviceScale) completionHandler:[strongSelf, handler, deviceScale](CGImageRef snapshotImage) {
+            RetainPtr<NSError> error;
+            RetainPtr<UIImage> uiImage;
+            
+            if (!snapshotImage)
+                error = createNSError(WKErrorUnknown);
+            else
+                uiImage = adoptNS([[UIImage alloc] initWithCGImage:snapshotImage scale:deviceScale orientation:UIImageOrientationUp]);
+            
+            handler(uiImage.get(), error.get());
+        }];
+    };
 
-    [self _snapshotRect:rectInViewCoordinates intoImageOfWidth:(snapshotWidth * deviceScale) completionHandler:^(CGImageRef snapshotImage) {
-        RetainPtr<NSError> error;
-        RetainPtr<UIImage> uiImage;
-
-        if (!snapshotImage)
-            error = createNSError(WKErrorUnknown);
-        else
-            uiImage = adoptNS([[UIImage alloc] initWithCGImage:snapshotImage scale:deviceScale orientation:UIImageOrientationUp]);
+    if ((snapshotConfiguration && !snapshotConfiguration.afterScreenUpdates) || !linkedOnOrAfter(WebKit::SDKVersion::FirstWithSnapshotAfterScreenUpdates)) {
+        callSnapshotRect();
+        return;
+    }
 
-        handler(uiImage.get(), error.get());
-    }];
+    _page->callAfterNextPresentationUpdate([callSnapshotRect = WTFMove(callSnapshotRect), handler](WebKit::CallbackBase::Error error) {
+        if (error != WebKit::CallbackBase::Error::None) {
+            handler(nil, createNSError(WKErrorUnknown).get());
+            return;
+        }
+        callSnapshotRect();
+    });
 }
 #endif
 
@@ -1265,23 +1308,72 @@ static NSDictionary *dictionaryRepresentationForEditorState(const WebKit::Editor
     };
 }
 
+static _WKSelectionAttributes selectionAttributes(const WebKit::EditorState& editorState, _WKSelectionAttributes previousAttributes)
+{
+    _WKSelectionAttributes attributes = _WKSelectionAttributeNoSelection;
+    if (editorState.selectionIsNone)
+        return attributes;
+
+    if (editorState.selectionIsRange)
+        attributes |= _WKSelectionAttributeIsRange;
+    else
+        attributes |= _WKSelectionAttributeIsCaret;
+
+    if (!editorState.isMissingPostLayoutData) {
+#if PLATFORM(IOS_FAMILY)
+        if (editorState.postLayoutData().atStartOfSentence)
+            attributes |= _WKSelectionAttributeAtStartOfSentence;
+#endif
+    } else if (previousAttributes & _WKSelectionAttributeAtStartOfSentence)
+        attributes |= _WKSelectionAttributeAtStartOfSentence;
+
+    return attributes;
+}
+
 - (void)_didChangeEditorState
 {
-    id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)self.UIDelegate;
+    auto newSelectionAttributes = selectionAttributes(_page->editorState(), _selectionAttributes);
+    if (_selectionAttributes != newSelectionAttributes) {
+        NSString *selectionAttributesKey = NSStringFromSelector(@selector(_selectionAttributes));
+        [self willChangeValueForKey:selectionAttributesKey];
+        _selectionAttributes = newSelectionAttributes;
+        [self didChangeValueForKey:selectionAttributesKey];
+    }
 
     // FIXME: We should either rename -_webView:editorStateDidChange: to clarify that it's only intended for use when testing,
     // or remove it entirely and use -_webView:didChangeFontAttributes: instead once text alignment is supported in the set of
     // font attributes.
+    id <WKUIDelegatePrivate> uiDelegate = (id <WKUIDelegatePrivate>)self.UIDelegate;
     if ([uiDelegate respondsToSelector:@selector(_webView:editorStateDidChange:)])
         [uiDelegate _webView:self editorStateDidChange:dictionaryRepresentationForEditorState(_page->editorState())];
 }
 
+- (_WKSelectionAttributes)_selectionAttributes
+{
+    return _selectionAttributes;
+}
+
 - (void)_showSafeBrowsingWarning:(const WebKit::SafeBrowsingWarning&)warning completionHandler:(CompletionHandler<void(Variant<WebKit::ContinueUnsafeLoad, URL>&&)>&&)completionHandler
 {
     _safeBrowsingWarning = adoptNS([[WKSafeBrowsingWarning alloc] initWithFrame:self.bounds safeBrowsingWarning:warning completionHandler:[weakSelf = WeakObjCPtr<WKWebView>(self), completionHandler = WTFMove(completionHandler)] (auto&& result) mutable {
-        if (auto strongSelf = weakSelf.get())
-            [std::exchange(strongSelf->_safeBrowsingWarning, nullptr) removeFromSuperview];
         completionHandler(WTFMove(result));
+        auto strongSelf = weakSelf.get();
+        if (!strongSelf)
+            return;
+        bool navigatesFrame = WTF::switchOn(result,
+            [] (WebKit::ContinueUnsafeLoad continueUnsafeLoad) { return continueUnsafeLoad == WebKit::ContinueUnsafeLoad::Yes; },
+            [] (const URL&) { return true; }
+        );
+        bool forMainFrameNavigation = [strongSelf->_safeBrowsingWarning forMainFrameNavigation];
+        if (navigatesFrame && forMainFrameNavigation) {
+            // The safe browsing warning will be hidden once the next page is shown.
+            return;
+        }
+        if (!navigatesFrame && strongSelf->_safeBrowsingWarning && !forMainFrameNavigation) {
+            strongSelf->_page->goBack();
+            return;
+        }
+        [std::exchange(strongSelf->_safeBrowsingWarning, nullptr) removeFromSuperview];
     }]);
     [self addSubview:_safeBrowsingWarning.get()];
 }
@@ -1291,6 +1383,12 @@ static NSDictionary *dictionaryRepresentationForEditorState(const WebKit::Editor
     [std::exchange(_safeBrowsingWarning, nullptr) removeFromSuperview];
 }
 
+- (void)_clearSafeBrowsingWarningIfForMainFrameNavigation
+{
+    if ([_safeBrowsingWarning forMainFrameNavigation])
+        [self _clearSafeBrowsingWarning];
+}
+
 #if ENABLE(ATTACHMENT_ELEMENT)
 
 - (void)_didInsertAttachment:(API::Attachment&)attachment withSource:(NSString *)source
@@ -1431,9 +1529,6 @@ FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)
 
     FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW)
     FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW)
-    FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(setTextColor:sender)
-    FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(setFontSize:sender)
-    FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(setFont:sender)
     FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_setTextColor:sender)
     FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_setFontSize:sender)
     FORWARD_CANPERFORMACTION_TO_WKCONTENTVIEW(_setFont:sender)
@@ -1451,9 +1546,6 @@ FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)
 
     FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW)
     FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW)
-    FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(setTextColor:sender)
-    FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(setFontSize:sender)
-    FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(setFont:sender)
     FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_setTextColor:sender)
     FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_setFontSize:sender)
     FORWARD_TARGETFORACTION_TO_WKCONTENTVIEW(_setFont:sender)
@@ -1463,19 +1555,9 @@ FOR_EACH_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)
     return [super targetForAction:action withSender:sender];
 }
 
-- (void)setFont:(UIFont *)font sender:(id)sender
-{
-    [_contentView setFontForWebView:font sender:sender];
-}
-
-- (void)setTextColor:(UIColor *)color sender:(id)sender
-{
-    [_contentView setTextColorForWebView:color sender:sender];
-}
-
-- (void)setFontSize:(CGFloat)fontSize sender:(id)sender
+- (void)willFinishIgnoringCalloutBarFadeAfterPerformingAction
 {
-    [_contentView setFontSizeForWebView:fontSize sender:sender];
+    [_contentView willFinishIgnoringCalloutBarFadeAfterPerformingAction];
 }
 
 static inline CGFloat floorToDevicePixel(CGFloat input, float deviceScaleFactor)
@@ -1625,7 +1707,7 @@ static WebCore::Color scrollViewBackgroundColor(WKWebView *webView)
     WebCore::Color color = baseScrollViewBackgroundColor(webView);
 
     if (!color.isValid())
-        color = WebCore::Color::white;
+        color = [webView->_contentView backgroundColor].CGColor;
 
     CGFloat zoomScale = contentZoomScale(webView);
     CGFloat minimumZoomScale = [webView->_scrollView minimumZoomScale];
@@ -1702,7 +1784,7 @@ static WebCore::Color scrollViewBackgroundColor(WKWebView *webView)
     if (_haveSetObscuredInsets)
         return _obscuredInsets;
 
-#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 110000
+#if PLATFORM(IOS)
     if (self._safeAreaShouldAffectObscuredInsets)
         return UIEdgeInsetsAdd(UIEdgeInsetsZero, self._scrollViewSystemContentInset, self._effectiveObscuredInsetEdgesAffectedBySafeArea);
 #endif
@@ -1717,7 +1799,7 @@ static WebCore::Color scrollViewBackgroundColor(WKWebView *webView)
 
     UIEdgeInsets insets = [_scrollView contentInset];
 
-#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 110000
+#if PLATFORM(IOS)
     if (self._safeAreaShouldAffectObscuredInsets)
         insets = UIEdgeInsetsAdd(insets, self._scrollViewSystemContentInset, self._effectiveObscuredInsetEdgesAffectedBySafeArea);
 #endif
@@ -1730,7 +1812,7 @@ static WebCore::Color scrollViewBackgroundColor(WKWebView *webView)
     if (_haveSetUnobscuredSafeAreaInsets)
         return _unobscuredSafeAreaInsets;
 
-#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 110000
+#if PLATFORM(IOS)
     if (!self._safeAreaShouldAffectObscuredInsets)
         return self.safeAreaInsets;
 #endif
@@ -1753,21 +1835,21 @@ static WebCore::Color scrollViewBackgroundColor(WKWebView *webView)
     _waitingForCommitAfterAnimatedResize = NO;
     _animatedResizeOriginalContentWidth = 0;
     [_contentView setHidden:NO];
-    _scrollOffsetToRestore = std::nullopt;
-    _unobscuredCenterToRestore = std::nullopt;
+    _scrollOffsetToRestore = WTF::nullopt;
+    _unobscuredCenterToRestore = WTF::nullopt;
     _scrollViewBackgroundColor = WebCore::Color();
     _delayUpdateVisibleContentRects = NO;
     _hadDelayedUpdateVisibleContentRects = NO;
     _currentlyAdjustingScrollViewInsetsForKeyboard = NO;
-    _lastSentViewLayoutSize = std::nullopt;
-    _lastSentMaximumUnobscuredSize = std::nullopt;
-    _lastSentDeviceOrientation = std::nullopt;
+    _lastSentViewLayoutSize = WTF::nullopt;
+    _lastSentMaximumUnobscuredSize = WTF::nullopt;
+    _lastSentDeviceOrientation = WTF::nullopt;
 
-    _frozenVisibleContentRect = std::nullopt;
-    _frozenUnobscuredContentRect = std::nullopt;
+    _frozenVisibleContentRect = WTF::nullopt;
+    _frozenUnobscuredContentRect = WTF::nullopt;
 
     _firstPaintAfterCommitLoadTransactionID = 0;
-    _firstTransactionIDAfterPageRestore = std::nullopt;
+    _firstTransactionIDAfterPageRestore = WTF::nullopt;
 
     _hasScheduledVisibleRectUpdate = NO;
     _commitDidRestoreScrollPosition = NO;
@@ -1779,6 +1861,8 @@ static WebCore::Color scrollViewBackgroundColor(WKWebView *webView)
 {
     RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _processWillSwap]", self);
     [self _processWillSwapOrDidExit];
+    if (_gestureController)
+        _gestureController->disconnectFromProcess();
 }
 
 - (void)_processDidExit
@@ -1788,10 +1872,10 @@ static WebCore::Color scrollViewBackgroundColor(WKWebView *webView)
     [self _processWillSwapOrDidExit];
 
     [_contentView setFrame:self.bounds];
-    [_scrollView setBackgroundColor:[UIColor whiteColor]];
+    [_scrollView setBackgroundColor:[_contentView backgroundColor]];
     [_scrollView setContentOffset:[self _initialContentOffsetForScrollView]];
     [_scrollView setZoomScale:1];
-    
+    _gestureController = nullptr;
 }
 
 - (void)_didRelaunchProcess
@@ -1799,6 +1883,8 @@ static WebCore::Color scrollViewBackgroundColor(WKWebView *webView)
     RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _didRelaunchProcess]", self);
     _hasScheduledVisibleRectUpdate = NO;
     _visibleContentRectUpdateScheduledFromScrollViewInStableState = YES;
+    if (_gestureController)
+        _gestureController->connectToProcess();
 }
 
 - (void)_didCommitLoadForMainFrame
@@ -1953,7 +2039,7 @@ static inline bool areEssentiallyEqualAsFloat(float a, float b)
     if (_firstTransactionIDAfterPageRestore && layerTreeTransaction.transactionID() >= _firstTransactionIDAfterPageRestore.value()) {
         if (_scrollOffsetToRestore) {
             WebCore::FloatPoint scaledScrollOffset = _scrollOffsetToRestore.value();
-            _scrollOffsetToRestore = std::nullopt;
+            _scrollOffsetToRestore = WTF::nullopt;
 
             if (areEssentiallyEqualAsFloat(contentZoomScale(self), _scaleToRestore)) {
                 scaledScrollOffset.scale(_scaleToRestore);
@@ -1968,7 +2054,7 @@ static inline bool areEssentiallyEqualAsFloat(float a, float b)
 
         if (_unobscuredCenterToRestore) {
             WebCore::FloatPoint unobscuredCenterToRestore = _unobscuredCenterToRestore.value();
-            _unobscuredCenterToRestore = std::nullopt;
+            _unobscuredCenterToRestore = WTF::nullopt;
 
             if (areEssentiallyEqualAsFloat(contentZoomScale(self), _scaleToRestore)) {
                 CGRect unobscuredRect = UIEdgeInsetsInsetRect(self.bounds, _obscuredInsets);
@@ -1987,7 +2073,7 @@ static inline bool areEssentiallyEqualAsFloat(float a, float b)
         if (_gestureController)
             _gestureController->didRestoreScrollPosition();
 
-        _firstTransactionIDAfterPageRestore = std::nullopt;
+        _firstTransactionIDAfterPageRestore = WTF::nullopt;
     }
 
     if (needUpdateVisibleContentRects)
@@ -2012,7 +2098,7 @@ static inline bool areEssentiallyEqualAsFloat(float a, float b)
         _gestureController->didRestoreScrollPosition();
 }
 
-- (void)_restorePageScrollPosition:(std::optional<WebCore::FloatPoint>)scrollPosition scrollOrigin:(WebCore::FloatPoint)scrollOrigin previousObscuredInset:(WebCore::FloatBoxExtent)obscuredInsets scale:(double)scale
+- (void)_restorePageScrollPosition:(Optional<WebCore::FloatPoint>)scrollPosition scrollOrigin:(WebCore::FloatPoint)scrollOrigin previousObscuredInset:(WebCore::FloatBoxExtent)obscuredInsets scale:(double)scale
 {
     if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing)
         return;
@@ -2024,13 +2110,13 @@ static inline bool areEssentiallyEqualAsFloat(float a, float b)
     if (scrollPosition)
         _scrollOffsetToRestore = WebCore::ScrollableArea::scrollOffsetFromPosition(WebCore::FloatPoint(scrollPosition.value()), WebCore::toFloatSize(scrollOrigin));
     else
-        _scrollOffsetToRestore = std::nullopt;
+        _scrollOffsetToRestore = WTF::nullopt;
 
     _obscuredInsetsWhenSaved = obscuredInsets;
     _scaleToRestore = scale;
 }
 
-- (void)_restorePageStateToUnobscuredCenter:(std::optional<WebCore::FloatPoint>)center scale:(double)scale
+- (void)_restorePageStateToUnobscuredCenter:(Optional<WebCore::FloatPoint>)center scale:(double)scale
 {
     if (_dynamicViewportUpdateMode != WebKit::DynamicViewportUpdateMode::NotResizing)
         return;
@@ -2063,8 +2149,8 @@ static inline bool areEssentiallyEqualAsFloat(float a, float b)
 #if HAVE(IOSURFACE_ACCELERATOR)
     WebCore::IOSurface::Format compressedFormat = WebCore::IOSurface::Format::YUV422;
     if (WebCore::IOSurface::allowConversionFromFormatToFormat(snapshotFormat, compressedFormat)) {
-        RefPtr<WebKit::ViewSnapshot> viewSnapshot = WebKit::ViewSnapshot::create(nullptr);
-        WebCore::IOSurface::convertToFormat(WTFMove(surface), WebCore::IOSurface::Format::YUV422, [viewSnapshot](std::unique_ptr<WebCore::IOSurface> convertedSurface) {
+        auto viewSnapshot = WebKit::ViewSnapshot::create(nullptr);
+        WebCore::IOSurface::convertToFormat(WTFMove(surface), WebCore::IOSurface::Format::YUV422, [viewSnapshot = viewSnapshot.copyRef()](std::unique_ptr<WebCore::IOSurface> convertedSurface) {
             if (convertedSurface)
                 viewSnapshot->setSurface(WTFMove(convertedSurface));
         });
@@ -2225,7 +2311,7 @@ static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOff
 }
 
 // focusedElementRect and selectionRect are both in document coordinates.
-- (void)_zoomToFocusRect:(WebCore::FloatRect)focusedElementRectInDocumentCoordinates selectionRect:(WebCore::FloatRect)selectionRectInDocumentCoordinates insideFixed:(BOOL)insideFixed
+- (void)_zoomToFocusRect:(const WebCore::FloatRect&)focusedElementRectInDocumentCoordinates selectionRect:(const WebCore::FloatRect&)selectionRectInDocumentCoordinates insideFixed:(BOOL)insideFixed
     fontSize:(float)fontSize minimumScale:(double)minimumScale maximumScale:(double)maximumScale allowScaling:(BOOL)allowScaling forceScroll:(BOOL)forceScroll
 {
     LOG_WITH_STREAM(VisibleRects, stream << "_zoomToFocusRect:" << focusedElementRectInDocumentCoordinates << " selectionRect:" << selectionRectInDocumentCoordinates);
@@ -2233,7 +2319,7 @@ static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOff
 
     const double minimumHeightToShowContentAboveKeyboard = 106;
     const CFTimeInterval formControlZoomAnimationDuration = 0.25;
-    const double caretOffsetFromWindowEdge = 20;
+    const double caretOffsetFromWindowEdge = 8;
 
     UIWindow *window = [_scrollView window];
 
@@ -2305,53 +2391,85 @@ static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOff
             return;
     }
 
-    // We want to zoom to the left/top corner of the DOM node, with as much spacing on all sides as we
-    // can get based on the visible area after zooming (workingFrame).  The spacing in either dimension is half the
+    // We want to center the focused element within the viewport, with as much spacing on all sides as
+    // we can get based on the visible area after zooming. The spacing in either dimension is half the
     // difference between the size of the DOM node and the size of the visible frame.
-    CGFloat horizontalSpaceInWebViewCoordinates = std::max((visibleSize.width - focusedElementRectInNewScale.width()) / 2.0, 0.0);
-    CGFloat verticalSpaceInWebViewCoordinates = std::max((visibleSize.height - focusedElementRectInNewScale.height()) / 2.0, 0.0);
+    // If the element is too wide to be horizontally centered or too tall to be vertically centered, we
+    // instead scroll such that the left edge or top edge of the element is within the left half or top
+    // half of the viewport, respectively.
+    CGFloat horizontalSpaceInWebViewCoordinates = (visibleSize.width - focusedElementRectInNewScale.width()) / 2.0;
+    CGFloat verticalSpaceInWebViewCoordinates = (visibleSize.height - focusedElementRectInNewScale.height()) / 2.0;
+
+    auto topLeft = CGPointZero;
+    auto scrollViewInsets = [_scrollView _effectiveContentInset];
+    auto currentTopLeft = [_scrollView contentOffset];
+
+    if (_haveSetObscuredInsets) {
+        currentTopLeft.x += _obscuredInsets.left;
+        currentTopLeft.y += _obscuredInsets.top;
+    }
 
-    CGPoint topLeft;
-    topLeft.x = focusedElementRectInNewScale.x() - horizontalSpaceInWebViewCoordinates;
-    topLeft.y = focusedElementRectInNewScale.y() - verticalSpaceInWebViewCoordinates - visibleOffsetFromTop;
+    if (horizontalSpaceInWebViewCoordinates > 0)
+        topLeft.x = focusedElementRectInNewScale.x() - horizontalSpaceInWebViewCoordinates;
+    else {
+        auto minimumOffsetToRevealLeftEdge = std::max(-scrollViewInsets.left, focusedElementRectInNewScale.x() - visibleSize.width / 2);
+        auto maximumOffsetToRevealLeftEdge = focusedElementRectInNewScale.x();
+        topLeft.x = clampTo<double>(currentTopLeft.x, minimumOffsetToRevealLeftEdge, maximumOffsetToRevealLeftEdge);
+    }
+
+    if (verticalSpaceInWebViewCoordinates > 0)
+        topLeft.y = focusedElementRectInNewScale.y() - verticalSpaceInWebViewCoordinates;
+    else {
+        auto minimumOffsetToRevealTopEdge = std::max(-scrollViewInsets.top, focusedElementRectInNewScale.y() - visibleSize.height / 2);
+        auto maximumOffsetToRevealTopEdge = focusedElementRectInNewScale.y();
+        topLeft.y = clampTo<double>(currentTopLeft.y, minimumOffsetToRevealTopEdge, maximumOffsetToRevealTopEdge);
+    }
+
+    topLeft.y -= visibleOffsetFromTop;
+
+    WebCore::FloatRect documentBoundsInNewScale = [_contentView bounds];
+    documentBoundsInNewScale.scale(scale);
+    documentBoundsInNewScale.moveBy([_contentView frame].origin);
 
     CGFloat minimumAllowableHorizontalOffsetInWebViewCoordinates = -INFINITY;
     CGFloat minimumAllowableVerticalOffsetInWebViewCoordinates = -INFINITY;
+    CGFloat maximumAllowableHorizontalOffsetInWebViewCoordinates = CGRectGetMaxX(documentBoundsInNewScale) - visibleSize.width;
+    CGFloat maximumAllowableVerticalOffsetInWebViewCoordinates = CGRectGetMaxY(documentBoundsInNewScale) - visibleSize.height;
+
     if (selectionRectIsNotNull) {
         WebCore::FloatRect selectionRectInNewScale = selectionRectInDocumentCoordinates;
         selectionRectInNewScale.scale(scale);
         selectionRectInNewScale.moveBy([_contentView frame].origin);
+        // Adjust the min and max allowable scroll offsets, such that the selection rect remains visible.
         minimumAllowableHorizontalOffsetInWebViewCoordinates = CGRectGetMaxX(selectionRectInNewScale) + caretOffsetFromWindowEdge - visibleSize.width;
         minimumAllowableVerticalOffsetInWebViewCoordinates = CGRectGetMaxY(selectionRectInNewScale) + caretOffsetFromWindowEdge - visibleSize.height - visibleOffsetFromTop;
+        maximumAllowableHorizontalOffsetInWebViewCoordinates = std::min<CGFloat>(maximumAllowableHorizontalOffsetInWebViewCoordinates, CGRectGetMinX(selectionRectInNewScale) - caretOffsetFromWindowEdge);
+        maximumAllowableVerticalOffsetInWebViewCoordinates = std::min<CGFloat>(maximumAllowableVerticalOffsetInWebViewCoordinates, CGRectGetMinY(selectionRectInNewScale) - caretOffsetFromWindowEdge - visibleOffsetFromTop);
     }
 
-    WebCore::FloatRect documentBoundsInNewScale = [_contentView bounds];
-    documentBoundsInNewScale.scale(scale);
-    documentBoundsInNewScale.moveBy([_contentView frame].origin);
-
     // Constrain the left edge in document coordinates so that:
     //  - it isn't so small that the scrollVisibleRect isn't visible on the screen
     //  - it isn't so great that the document's right edge is less than the right edge of the screen
-    if (selectionRectIsNotNull && topLeft.x < minimumAllowableHorizontalOffsetInWebViewCoordinates)
-        topLeft.x = minimumAllowableHorizontalOffsetInWebViewCoordinates;
-    else {
-        CGFloat maximumAllowableHorizontalOffset = CGRectGetMaxX(documentBoundsInNewScale) - visibleSize.width;
-        if (topLeft.x > maximumAllowableHorizontalOffset)
-            topLeft.x = maximumAllowableHorizontalOffset;
-    }
+    topLeft.x = clampTo<CGFloat>(topLeft.x, minimumAllowableHorizontalOffsetInWebViewCoordinates, maximumAllowableHorizontalOffsetInWebViewCoordinates);
 
     // Constrain the top edge in document coordinates so that:
     //  - it isn't so small that the scrollVisibleRect isn't visible on the screen
     //  - it isn't so great that the document's bottom edge is higher than the top of the form assistant
-    if (selectionRectIsNotNull && topLeft.y < minimumAllowableVerticalOffsetInWebViewCoordinates)
-        topLeft.y = minimumAllowableVerticalOffsetInWebViewCoordinates;
-    else {
-        CGFloat maximumAllowableVerticalOffset = CGRectGetMaxY(documentBoundsInNewScale) - visibleSize.height;
-        if (topLeft.y > maximumAllowableVerticalOffset)
-            topLeft.y = maximumAllowableVerticalOffset;
+    topLeft.y = clampTo<CGFloat>(topLeft.y, minimumAllowableVerticalOffsetInWebViewCoordinates, maximumAllowableVerticalOffsetInWebViewCoordinates);
+
+    if (_haveSetObscuredInsets) {
+        // This looks unintuitive, but is necessary in order to precisely center the focused element in the visible area.
+        // The top left position already accounts for top and left obscured insets - i.e., a topLeft of (0, 0) corresponds
+        // to the top- and left-most point below (and to the right of) the top inset area and left inset areas, respectively.
+        // However, when telling WKScrollView to scroll to a given center position, this center position is computed relative
+        // to the coordinate space of the scroll view. Thus, to compute our center position from the top left position, we
+        // need to first move the top left position up and to the left, and then add half the width and height of the content
+        // area (including obscured insets).
+        topLeft.x -= _obscuredInsets.left;
+        topLeft.y -= _obscuredInsets.top;
     }
 
-    WebCore::FloatPoint newCenter = CGPointMake(topLeft.x + unobscuredScrollViewRectInWebViewCoordinates.size.width / 2.0, topLeft.y + unobscuredScrollViewRectInWebViewCoordinates.size.height / 2.0);
+    WebCore::FloatPoint newCenter = CGPointMake(topLeft.x + CGRectGetWidth(self.bounds) / 2, topLeft.y + CGRectGetHeight(self.bounds) / 2);
 
     if (scale != currentScale)
         _page->willStartUserTriggeredZooming();
@@ -2363,7 +2481,17 @@ static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOff
     [_scrollView _zoomToCenter:newCenter scale:scale duration:formControlZoomAnimationDuration force:YES];
 }
 
-- (CGFloat)_targetContentZoomScaleForRect:(const WebCore::FloatRect&)targetRect currentScale:(double)currentScale fitEntireRect:(BOOL)fitEntireRect minimumScale:(double)minimumScale maximumScale:(double)maximumScale
+- (double)_initialScaleFactor
+{
+    return _initialScaleFactor;
+}
+
+- (double)_contentZoomScale
+{
+    return contentZoomScale(self);
+}
+
+- (double)_targetContentZoomScaleForRect:(const WebCore::FloatRect&)targetRect currentScale:(double)currentScale fitEntireRect:(BOOL)fitEntireRect minimumScale:(double)minimumScale maximumScale:(double)maximumScale
 {
     WebCore::FloatSize unobscuredContentSize([self _contentRectForUserInteraction].size);
     double horizontalScale = unobscuredContentSize.width() * currentScale / targetRect.width();
@@ -2396,6 +2524,7 @@ static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOff
 - (void)didMoveToWindow
 {
     _page->activityStateDidChange(WebCore::ActivityState::allFlags());
+    _page->webViewDidMoveToWindow();
 }
 
 - (void)setOpaque:(BOOL)opaque
@@ -2411,7 +2540,10 @@ static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOff
     if (!_page)
         return;
 
-    _page->setDrawsBackground(opaque);
+    Optional<WebCore::Color> backgroundColor;
+    if (!opaque)
+        backgroundColor = WebCore::Color(WebCore::Color::transparent);
+    _page->setBackgroundColor(backgroundColor);
     [self _updateScrollViewBackground];
 }
 
@@ -2419,6 +2551,7 @@ static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOff
 {
     [super setBackgroundColor:backgroundColor];
     [_contentView setBackgroundColor:backgroundColor];
+    [self _updateScrollViewBackground];
 }
 
 - (BOOL)_allowsDoubleTapGestures
@@ -2441,9 +2574,8 @@ static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOff
 
     // At this point, we have a page that asked for width = device-width. However,
     // if the content's width and height were large, we might have had to shrink it.
-    // Since we'll enable double tap zoom whenever we're not at the actual
-    // initial scale, this simply becomes a test of the current scale against 1.
-    return !areEssentiallyEqualAsFloat(contentZoomScale(self), 1);
+    // We'll enable double tap zoom whenever we're not at the actual initial scale.
+    return !areEssentiallyEqualAsFloat(contentZoomScale(self), _initialScaleFactor);
 }
 
 - (BOOL)_stylusTapGestureShouldCreateEditableImage
@@ -2482,6 +2614,10 @@ static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOff
         [_contentView scrollViewWillStartPanOrPinchGesture];
     }
     [_contentView willStartZoomOrScroll];
+
+#if ENABLE(POINTER_EVENTS)
+    [_contentView cancelPointersForGestureRecognizer:scrollView.pinchGestureRecognizer];
+#endif
 }
 
 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
@@ -2518,6 +2654,14 @@ static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOff
     // zooming. We'll animate to the right place once the zoom finishes.
     if ([scrollView isZooming])
         *targetContentOffset = [scrollView contentOffset];
+#if ENABLE(POINTER_EVENTS)
+    else {
+        if ([_contentView preventsPanningInXAxis])
+            targetContentOffset->x = scrollView.contentOffset.x;
+        if ([_contentView preventsPanningInYAxis])
+            targetContentOffset->y = scrollView.contentOffset.y;
+    }
+#endif
 #if ENABLE(CSS_SCROLL_SNAP) && ENABLE(ASYNC_SCROLLING)
     if (WebKit::RemoteScrollingCoordinatorProxy* coordinator = _page->scrollingCoordinatorProxy()) {
         // FIXME: Here, I'm finding the maximum horizontal/vertical scroll offsets. There's probably a better way to do this.
@@ -2555,6 +2699,29 @@ static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOff
     [self _didFinishScrolling];
 }
 
+#if ENABLE(POINTER_EVENTS)
+- (CGPoint)_scrollView:(UIScrollView *)scrollView adjustedOffsetForOffset:(CGPoint)offset translation:(CGPoint)translation startPoint:(CGPoint)start locationInView:(CGPoint)locationInView horizontalVelocity:(inout double *)hv verticalVelocity:(inout double *)vv
+{
+    if (![_contentView preventsPanningInXAxis] && ![_contentView preventsPanningInYAxis]) {
+        [_contentView cancelPointersForGestureRecognizer:scrollView.panGestureRecognizer];
+        return offset;
+    }
+
+    CGPoint adjustedContentOffset = CGPointMake(offset.x, offset.y);
+    if ([_contentView preventsPanningInXAxis])
+        adjustedContentOffset.x = start.x;
+    if ([_contentView preventsPanningInYAxis])
+        adjustedContentOffset.y = start.y;
+
+    if ((![_contentView preventsPanningInXAxis] && adjustedContentOffset.x != start.x)
+        || (![_contentView preventsPanningInYAxis] && adjustedContentOffset.y != start.y)) {
+        [_contentView cancelPointersForGestureRecognizer:scrollView.panGestureRecognizer];
+    }
+
+    return adjustedContentOffset;
+}
+#endif
+
 - (void)scrollViewDidScroll:(UIScrollView *)scrollView
 {
     if (![self usesStandardContentView] && [_customContentView respondsToSelector:@selector(web_scrollViewDidScroll:)])
@@ -2687,7 +2854,7 @@ static WebCore::FloatPoint constrainContentOffset(WebCore::FloatPoint contentOff
         return;
 
     LOG_WITH_STREAM(VisibleRects, stream << "-[WKWebView " << _page->pageID() << " _dispatchSetViewLayoutSize:] " << viewLayoutSize << " contentZoomScale " << contentZoomScale(self));
-    _page->setViewportConfigurationViewLayoutSize(viewLayoutSize, _page->layoutSizeScaleFactor(), _minimumEffectiveDeviceWidth);
+    _page->setViewportConfigurationViewLayoutSize(viewLayoutSize, _page->layoutSizeScaleFactor(), _page->minimumEffectiveDeviceWidth());
     _lastSentViewLayoutSize = viewLayoutSize;
 }
 
@@ -2911,6 +3078,26 @@ static bool scrollViewCanScroll(UIScrollView *scrollView)
     CGRect unobscuredRectInContentCoordinates = _frozenUnobscuredContentRect ? _frozenUnobscuredContentRect.value() : [self convertRect:unobscuredRect toView:_contentView.get()];
     unobscuredRectInContentCoordinates = CGRectIntersection(unobscuredRectInContentCoordinates, [self _contentBoundsExtendedForRubberbandingWithScale:scaleFactor]);
 
+    // The following logic computes the extent to which the bottom, top, left and right content insets are visible.
+    auto scrollViewInsets = [_scrollView contentInset];
+    auto scrollViewBounds = [_scrollView bounds];
+    auto scrollViewContentSize = [_scrollView contentSize];
+    auto scrollViewOriginIncludingInset = UIEdgeInsetsInsetRect(scrollViewBounds, computedContentInsetUnadjustedForKeyboard).origin;
+    auto maximumVerticalScrollExtentWithoutRevealingBottomContentInset = scrollViewContentSize.height - CGRectGetHeight(scrollViewBounds);
+    auto maximumHorizontalScrollExtentWithoutRevealingRightContentInset = scrollViewContentSize.width - CGRectGetWidth(scrollViewBounds);
+    auto contentInsets = UIEdgeInsetsZero;
+    if (scrollViewInsets.left > 0 && scrollViewOriginIncludingInset.x < 0)
+        contentInsets.left = std::min(-scrollViewOriginIncludingInset.x, scrollViewInsets.left) / scaleFactor;
+
+    if (scrollViewInsets.top > 0 && scrollViewOriginIncludingInset.y < 0)
+        contentInsets.top = std::min(-scrollViewOriginIncludingInset.y, scrollViewInsets.top) / scaleFactor;
+
+    if (scrollViewInsets.right > 0 && scrollViewOriginIncludingInset.x > maximumHorizontalScrollExtentWithoutRevealingRightContentInset)
+        contentInsets.right = std::min(scrollViewOriginIncludingInset.x - maximumHorizontalScrollExtentWithoutRevealingRightContentInset, scrollViewInsets.right) / scaleFactor;
+
+    if (scrollViewInsets.bottom > 0 && scrollViewOriginIncludingInset.y > maximumVerticalScrollExtentWithoutRevealingBottomContentInset)
+        contentInsets.bottom = std::min(scrollViewOriginIncludingInset.y - maximumVerticalScrollExtentWithoutRevealingBottomContentInset, scrollViewInsets.bottom) / scaleFactor;
+
 #if ENABLE(CSS_SCROLL_SNAP) && ENABLE(ASYNC_SCROLLING)
     if (inStableState) {
         WebKit::RemoteScrollingCoordinatorProxy* coordinator = _page->scrollingCoordinatorProxy();
@@ -2930,6 +3117,7 @@ static bool scrollViewCanScroll(UIScrollView *scrollView)
 
     [_contentView didUpdateVisibleRect:visibleRectInContentCoordinates
         unobscuredRect:unobscuredRectInContentCoordinates
+        contentInsets:contentInsets
         unobscuredRectInScrollViewCoordinates:unobscuredRect
         obscuredInsets:_obscuredInsets
         unobscuredSafeAreaInsets:[self _computedUnobscuredSafeAreaInset]
@@ -3091,6 +3279,9 @@ static int32_t activeOrientation(WKWebView *webView)
     else
         _inputViewBounds = [self.window convertRect:CGRectIntersection([endFrameValue CGRectValue], self.window.screen.bounds) fromWindow:nil];
 
+    if ([[UIPeripheralHost sharedInstance] isUndocked])
+        _inputViewBounds = CGRectZero;
+
     if (adjustScrollView) {
         CGFloat bottomInsetBeforeAdjustment = [_scrollView contentInset].bottom;
         SetForScope<BOOL> insetAdjustmentGuard(_currentlyAdjustingScrollViewInsetsForKeyboard, YES);
@@ -3105,7 +3296,7 @@ static int32_t activeOrientation(WKWebView *webView)
 
 - (BOOL)_shouldUpdateKeyboardWithInfo:(NSDictionary *)keyboardInfo
 {
-    if ([_contentView isAssistingNode])
+    if ([_contentView isFocusingElement])
         return YES;
 
     NSNumber *isLocalKeyboard = [keyboardInfo valueForKey:UIKeyboardIsLocalUserInfoKey];
@@ -3151,7 +3342,8 @@ static void hardwareKeyboardAvailabilityChangedCallback(CFNotificationCenterRef,
 {
     ASSERT(observer);
     WKWebView *webView = (__bridge WKWebView *)observer;
-    webView._page->hardwareKeyboardAvailabilityChanged();
+    [webView->_contentView _hardwareKeyboardAvailabilityChanged];
+    webView._page->hardwareKeyboardAvailabilityChanged(GSEventIsHardwareKeyboardAttached());
 }
 
 - (void)_windowDidRotate:(NSNotification *)notification
@@ -3223,8 +3415,8 @@ static void hardwareKeyboardAvailabilityChangedCallback(CFNotificationCenterRef,
 
 - (void)_navigationGestureDidEnd
 {
-    _frozenVisibleContentRect = std::nullopt;
-    _frozenUnobscuredContentRect = std::nullopt;
+    _frozenVisibleContentRect = WTF::nullopt;
+    _frozenUnobscuredContentRect = WTF::nullopt;
 }
 
 - (void)_showPasswordViewWithDocumentName:(NSString *)documentName passwordHandler:(void (^)(NSString *))passwordHandler
@@ -3957,6 +4149,21 @@ IGNORE_WARNINGS_END
     return _impl->accessibilityAttributeValue(attribute);
 }
 
+IGNORE_WARNINGS_BEGIN("deprecated-implementations")
+- (id)accessibilityAttributeValue:(NSString *)attribute forParameter:(id)parameter
+IGNORE_WARNINGS_END
+{
+    return _impl->accessibilityAttributeValue(attribute, parameter);
+}
+
+IGNORE_WARNINGS_BEGIN("deprecated-implementations")
+- (NSArray<NSString *> *)accessibilityParameterizedAttributeNames
+IGNORE_WARNINGS_END
+{
+    NSArray<NSString *> *names = [super accessibilityParameterizedAttributeNames];
+    return [names arrayByAddingObject:@"AXConvertRelativeFrame"];
+}
+
 - (NSView *)hitTest:(NSPoint)point
 {
     if (!_impl)
@@ -4329,7 +4536,7 @@ IGNORE_WARNINGS_END
     return WebCore::SchemeRegistry::isBuiltinScheme(urlScheme);
 }
 
-- (std::optional<BOOL>)_resolutionForShareSheetImmediateCompletionForTesting
+- (Optional<BOOL>)_resolutionForShareSheetImmediateCompletionForTesting
 {
     return _resolutionForShareSheetImmediateCompletionForTesting;
 }
@@ -4386,19 +4593,19 @@ FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)
 - (void)_setFont:(UIFont *)font sender:(id)sender
 {
     if (self.usesStandardContentView)
-        [_contentView setFontForWebView:font sender:sender];
+        [_contentView _setFontForWebView:font sender:sender];
 }
 
 - (void)_setFontSize:(CGFloat)fontSize sender:(id)sender
 {
     if (self.usesStandardContentView)
-        [_contentView setFontSizeForWebView:fontSize sender:sender];
+        [_contentView _setFontSizeForWebView:fontSize sender:sender];
 }
 
 - (void)_setTextColor:(UIColor *)color sender:(id)sender
 {
     if (self.usesStandardContentView)
-        [_contentView setTextColorForWebView:color sender:sender];
+        [_contentView _setTextColorForWebView:color sender:sender];
 }
 
 #endif // PLATFORM(IOS_FAMILY)
@@ -4410,11 +4617,38 @@ FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)
 
 - (void)_setEditable:(BOOL)editable
 {
+    bool wasEditable = _page->isEditable();
     _page->setEditable(editable);
 #if PLATFORM(MAC)
     if (editable)
         _impl->didBecomeEditable();
 #endif
+
+    if (wasEditable == editable)
+        return;
+
+#if PLATFORM(IOS_FAMILY)
+    [_contentView _didChangeWebViewEditability];
+#endif
+}
+
+- (void)_takeFindStringFromSelection:(id)sender
+{
+#if PLATFORM(MAC)
+    [self takeFindStringFromSelection:sender];
+#else
+    _page->executeEditCommand("TakeFindStringFromSelection"_s);
+#endif
+}
+
++ (NSString *)_stringForFind
+{
+    return WebKit::stringForFind();
+}
+
++ (void)_setStringForFind:(NSString *)findString
+{
+    WebKit::updateStringForFind(findString);
 }
 
 - (_WKRemoteObjectRegistry *)_remoteObjectRegistry
@@ -4484,6 +4718,21 @@ FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)
 #endif
 }
 
+- (void)_stopAllMediaPlayback
+{
+    _page->stopAllMediaPlayback();
+}
+
+- (void)_suspendAllMediaPlayback
+{
+    _page->suspendAllMediaPlayback();
+}
+
+- (void)_resumeAllMediaPlayback
+{
+    _page->resumeAllMediaPlayback();
+}
+
 - (NSURL *)_unreachableURL
 {
     return [NSURL _web_URLWithWTFString:_page->pageLoadState().unreachableURL()];
@@ -4570,6 +4819,18 @@ FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)
     return _page->processIdentifier();
 }
 
+- (pid_t)_provisionalWebProcessIdentifier
+{
+    if (![self _isValid])
+        return 0;
+
+    auto* provisionalPage = _page->provisionalPageProxy();
+    if (!provisionalPage)
+        return 0;
+
+    return provisionalPage->process().processIdentifier();
+}
+
 - (void)_killWebContentProcess
 {
     if (![self _isValid])
@@ -4604,6 +4865,77 @@ FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)
 {
     Ref<WebKit::WebProcessProxy> protectedProcessProxy(_page->process());
     protectedProcessProxy->requestTermination(WebKit::ProcessTerminationReason::RequestedByClient);
+
+    if (auto* provisionalPageProxy = _page->provisionalPageProxy()) {
+        Ref<WebKit::WebProcessProxy> protectedProcessProxy(provisionalPageProxy->process());
+        protectedProcessProxy->requestTermination(WebKit::ProcessTerminationReason::RequestedByClient);
+    }
+}
+
+- (CGRect)_convertRectFromRootViewCoordinates:(CGRect)rectInRootViewCoordinates
+{
+    // FIXME: It should be easier to talk about WKWebView coordinates in a consistent and cross-platform way.
+    // Currently, neither "root view" nor "window" mean "WKWebView coordinates" on both platforms.
+    // See https://webkit.org/b/193649 and related bugs.
+#if PLATFORM(IOS_FAMILY)
+    return [self convertRect:rectInRootViewCoordinates fromView:_contentView.get()];
+#else
+    return rectInRootViewCoordinates;
+#endif
+}
+
+- (CGRect)_convertRectToRootViewCoordinates:(CGRect)rectInWebViewCoordinates
+{
+#if PLATFORM(IOS_FAMILY)
+    return [self convertRect:rectInWebViewCoordinates toView:_contentView.get()];
+#else
+    return rectInWebViewCoordinates;
+#endif
+}
+
+- (void)_requestTextInputContextsInRect:(CGRect)rectInWebViewCoordinates completionHandler:(void(^)(NSArray<_WKTextInputContext *> *))completionHandler
+{
+#if PLATFORM(IOS_FAMILY)
+    if (![self usesStandardContentView]) {
+        completionHandler(@[]);
+        return;
+    }
+#endif
+
+    CGRect rectInRootViewCoordinates = [self _convertRectToRootViewCoordinates:rectInWebViewCoordinates];
+    auto weakSelf = WeakObjCPtr<WKWebView>(self);
+    _page->textInputContextsInRect(rectInRootViewCoordinates, [weakSelf, capturedCompletionHandler = makeBlockPtr(completionHandler)] (const Vector<WebKit::TextInputContext>& contexts) {
+        RetainPtr<NSMutableArray> elements = adoptNS([[NSMutableArray alloc] initWithCapacity:contexts.size()]);
+
+        auto strongSelf = weakSelf.get();
+        for (const auto& context : contexts) {
+            WebKit::TextInputContext contextWithWebViewBoundingRect = context;
+            contextWithWebViewBoundingRect.boundingRect = [strongSelf _convertRectFromRootViewCoordinates:context.boundingRect];
+            [elements addObject:adoptNS([[_WKTextInputContext alloc] _initWithTextInputContext:contextWithWebViewBoundingRect]).get()];
+        }
+
+        capturedCompletionHandler(elements.get());
+    });
+}
+
+- (void)_focusTextInputContext:(_WKTextInputContext *)textInputContext completionHandler:(void(^)(BOOL))completionHandler
+{
+#if PLATFORM(IOS_FAMILY)
+    if (![self usesStandardContentView]) {
+        completionHandler(NO);
+        return;
+    }
+#endif
+
+    auto webContext = [textInputContext _textInputContext];
+    if (webContext.webPageIdentifier != _page->pageID())
+        [NSException raise:NSInvalidArgumentException format:@"The provided _WKTextInputContext was not created by this WKWebView."];
+
+    [self becomeFirstResponder];
+
+    _page->focusTextInputContext(webContext, [capturedCompletionHandler = makeBlockPtr(completionHandler)](bool success) {
+        capturedCompletionHandler(success);
+    });
 }
 
 #if PLATFORM(MAC)
@@ -4761,6 +5093,11 @@ FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)
     return nil;
 }
 
+- (void)_simulateDeviceOrientationChangeWithAlpha:(double)alpha beta:(double)beta gamma:(double)gamma
+{
+    _page->simulateDeviceOrientationChange(alpha, beta, gamma);
+}
+
 + (BOOL)_handlesSafeBrowsing
 {
     return true;
@@ -4768,7 +5105,13 @@ FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)
 
 - (void)_showSafeBrowsingWarningWithTitle:(NSString *)title warning:(NSString *)warning details:(NSAttributedString *)details completionHandler:(void(^)(BOOL))completionHandler
 {
-    auto safeBrowsingWarning = WebKit::SafeBrowsingWarning::create(title, warning, details);
+    // FIXME: Adopt _showSafeBrowsingWarningWithURL and remove this function.
+    [self _showSafeBrowsingWarningWithURL:nil title:title warning:warning details:details completionHandler:completionHandler];
+}
+
+- (void)_showSafeBrowsingWarningWithURL:(NSURL *)url title:(NSString *)title warning:(NSString *)warning details:(NSAttributedString *)details completionHandler:(void(^)(BOOL))completionHandler
+{
+    auto safeBrowsingWarning = WebKit::SafeBrowsingWarning::create(url, title, warning, details);
     auto wrapper = [completionHandler = makeBlockPtr(completionHandler)] (Variant<WebKit::ContinueUnsafeLoad, URL>&& variant) {
         switchOn(variant, [&] (WebKit::ContinueUnsafeLoad continueUnsafeLoad) {
             switch (continueUnsafeLoad) {
@@ -4813,7 +5156,7 @@ FOR_EACH_PRIVATE_WKCONTENTVIEW_ACTION(FORWARD_ACTION_TO_WKCONTENTVIEW)
 
 - (void)_updateWebsitePolicies:(_WKWebsitePolicies *)websitePolicies
 {
-    auto data = websitePolicies->_websitePolicies->data();
+    auto data = websitePolicies.webpagePreferences->_websitePolicies->data();
     if (data.websiteDataStoreParameters)
         [NSException raise:NSInvalidArgumentException format:@"Updating WKWebsiteDataStore is only supported during decidePolicyForNavigationAction."];
     _page->updateWebsitePolicies(WTFMove(data));
@@ -4944,10 +5287,20 @@ static inline OptionSet<WebCore::LayoutMilestone> layoutMilestones(_WKRenderingP
     });
 }
 
+- (void)_getContentsAsAttributedStringWithCompletionHandler:(void (^)(NSAttributedString *, NSDictionary<NSAttributedStringDocumentAttributeKey, id> *, NSError *))completionHandler
+{
+    _page->getContentsAsAttributedString([handler = makeBlockPtr(completionHandler)](auto& attributedString) {
+        if (attributedString.string)
+            handler([[attributedString.string.get() retain] autorelease], [[attributedString.documentAttributes.get() retain] autorelease], nil);
+        else
+            handler(nil, nil, createNSError(WKErrorUnknown).get());
+    });
+}
+
 - (void)_getApplicationManifestWithCompletionHandler:(void (^)(_WKApplicationManifest *))completionHandler
 {
 #if ENABLE(APPLICATION_MANIFEST)
-    _page->getApplicationManifest([completionHandler = makeBlockPtr(completionHandler)](const std::optional<WebCore::ApplicationManifest>& manifest, WebKit::CallbackBase::Error error) {
+    _page->getApplicationManifest([completionHandler = makeBlockPtr(completionHandler)](const Optional<WebCore::ApplicationManifest>& manifest, WebKit::CallbackBase::Error error) {
         UNUSED_PARAM(error);
         if (completionHandler) {
             if (manifest) {
@@ -5146,6 +5499,11 @@ static inline WebKit::FindOptions toFindOptions(_WKFindOptions wkFindOptions)
 - (void)_findString:(NSString *)string options:(_WKFindOptions)options maxCount:(NSUInteger)maxCount
 {
 #if PLATFORM(IOS_FAMILY)
+    // While AppKit contains logic in NSBarTextFinder to automatically update the find pasteboard
+    // when the find string changes, this (along with the find pasteboard itself) are both missing
+    // from iOS; thus, on iOS, we update the current find-in-page string here.
+    WebKit::updateStringForFind(string);
+
     if (_customContentView) {
         [_customContentView web_findString:string options:options maxCount:maxCount];
         return;
@@ -5182,6 +5540,7 @@ static inline WebKit::FindOptions toFindOptions(_WKFindOptions wkFindOptions)
     _inputDelegate = inputDelegate;
 
     class FormClient : public API::FormClient {
+        WTF_MAKE_FAST_ALLOCATED;
     public:
         explicit FormClient(WKWebView *webView)
             : m_webView(webView)
@@ -5348,24 +5707,27 @@ static inline WebKit::FindOptions toFindOptions(_WKFindOptions wkFindOptions)
     if (_page->layoutSizeScaleFactor() == viewScale)
         return;
 
-    _page->setViewportConfigurationViewLayoutSize([self activeViewLayoutSize:self.bounds], viewScale, _minimumEffectiveDeviceWidth);
+    _page->setViewportConfigurationViewLayoutSize([self activeViewLayoutSize:self.bounds], viewScale, _page->minimumEffectiveDeviceWidth());
 #endif
 }
 
 - (void)_setMinimumEffectiveDeviceWidth:(CGFloat)minimumEffectiveDeviceWidth
 {
-    if (_minimumEffectiveDeviceWidth == minimumEffectiveDeviceWidth)
+#if PLATFORM(IOS_FAMILY)
+    if (_page->minimumEffectiveDeviceWidth() == minimumEffectiveDeviceWidth)
         return;
 
-    _minimumEffectiveDeviceWidth = minimumEffectiveDeviceWidth;
-#if PLATFORM(IOS_FAMILY)
-    _page->setViewportConfigurationViewLayoutSize([self activeViewLayoutSize:self.bounds], _page->layoutSizeScaleFactor(), _minimumEffectiveDeviceWidth);
+    _page->setViewportConfigurationViewLayoutSize([self activeViewLayoutSize:self.bounds], _page->layoutSizeScaleFactor(), minimumEffectiveDeviceWidth);
 #endif
 }
 
 - (CGFloat)_minimumEffectiveDeviceWidth
 {
-    return _minimumEffectiveDeviceWidth;
+#if PLATFORM(IOS_FAMILY)
+    return _page->minimumEffectiveDeviceWidth();
+#else
+    return 0;
+#endif
 }
 
 #pragma mark scrollperf methods
@@ -5438,9 +5800,9 @@ static inline WebKit::FindOptions toFindOptions(_WKFindOptions wkFindOptions)
 #endif
 }
 
-- (void)_muteMediaCapture
+- (_WKMediaCaptureState)_mediaCaptureState
 {
-    _page->setMediaStreamCaptureMuted(true);
+    return WebKit::toWKMediaCaptureState(_page->mediaStateFlags());
 }
 
 - (void)_setMediaCaptureEnabled:(BOOL)enabled
@@ -5460,7 +5822,9 @@ static inline WebKit::FindOptions toFindOptions(_WKFindOptions wkFindOptions)
     if (mutedState & _WKMediaAudioMuted)
         coreState |= WebCore::MediaProducer::AudioIsMuted;
     if (mutedState & _WKMediaCaptureDevicesMuted)
-        coreState |= WebCore::MediaProducer::CaptureDevicesAreMuted;
+        coreState |= WebCore::MediaProducer::AudioAndVideoCaptureIsMuted;
+    if (mutedState & _WKMediaScreenCaptureMuted)
+        coreState |= WebCore::MediaProducer::ScreenCaptureIsMuted;
 
     _page->setMuted(coreState);
 }
@@ -5870,7 +6234,7 @@ static inline WebKit::FindOptions toFindOptions(_WKFindOptions wkFindOptions)
             return;
         }
 
-        RefPtr<WebKit::ShareableBitmap> bitmap = WebKit::ShareableBitmap::create(imageHandle, WebKit::SharedMemory::Protection::ReadOnly);
+        auto bitmap = WebKit::ShareableBitmap::create(imageHandle, WebKit::SharedMemory::Protection::ReadOnly);
 
         if (!bitmap) {
             copiedCompletionHandler(nullptr);
@@ -5900,6 +6264,34 @@ static inline WebKit::FindOptions toFindOptions(_WKFindOptions wkFindOptions)
     _maximumUnobscuredSizeOverride = CGSizeZero;
 }
 
+static WTF::Optional<WebCore::ViewportArguments> viewportArgumentsFromDictionary(NSDictionary<NSString *, NSString *> *viewportArgumentPairs, bool viewportFitEnabled)
+{
+    if (!viewportArgumentPairs)
+        return WTF::nullopt;
+
+    WebCore::ViewportArguments viewportArguments(WebCore::ViewportArguments::ViewportMeta);
+
+    [viewportArgumentPairs enumerateKeysAndObjectsUsingBlock:makeBlockPtr([&] (NSString *key, NSString *value, BOOL* stop) {
+        if (![key isKindOfClass:[NSString class]] || ![value isKindOfClass:[NSString class]])
+            [NSException raise:NSInvalidArgumentException format:@"-[WKWebView _overrideViewportWithArguments:]: Keys and values must all be NSStrings."];
+        String keyString = key;
+        String valueString = value;
+        WebCore::setViewportFeature(viewportArguments, keyString, valueString, viewportFitEnabled, [] (WebCore::ViewportErrorCode, const String& errorMessage) {
+            NSLog(@"-[WKWebView _overrideViewportWithArguments:]: Error parsing viewport argument: %s", errorMessage.utf8().data());
+        });
+    }).get()];
+
+    return viewportArguments;
+}
+
+- (void)_overrideViewportWithArguments:(NSDictionary<NSString *, NSString *> *)arguments
+{
+    if (!_page)
+        return;
+
+    _page->setOverrideViewportArguments(viewportArgumentsFromDictionary(arguments, _page->preferences().viewportFitEnabled()));
+}
+
 - (UIView *)_viewForFindUI
 {
     return [self viewForZoomingInScrollView:[self scrollView]];
@@ -6252,6 +6644,7 @@ static WebCore::UserInterfaceLayoutDirection toUserInterfaceLayoutDirection(UISe
 {
     auto infoRequest = WebKit::InteractionInformationRequest(WebCore::roundedIntPoint(position));
     infoRequest.includeSnapshot = true;
+    infoRequest.readonly = true;
 
     [_contentView doAfterPositionInformationUpdate:[capturedBlock = makeBlockPtr(block)] (WebKit::InteractionInformationAtPosition information) {
         capturedBlock([_WKActivatedElementInfo activatedElementInfoWithInteractionInformationAtPosition:information]);
@@ -6326,6 +6719,11 @@ static WebCore::UserInterfaceLayoutDirection toUserInterfaceLayoutDirection(UISe
     [_contentView accessoryDone];
 }
 
+- (void)_dismissFilePicker
+{
+    [_contentView dismissFilePicker];
+}
+
 - (void)setTimePickerValueToHour:(NSInteger)hour minute:(NSInteger)minute
 {
     [_contentView setTimePickerValueToHour:hour minute:minute];
@@ -6687,7 +7085,7 @@ static WebCore::UserInterfaceLayoutDirection toUserInterfaceLayoutDirection(UISe
 
 - (NSRect)_candidateRect
 {
-    return _page->editorState().postLayoutData().selectionClipRect;
+    return _page->editorState().postLayoutData().focusedElementRect;
 }
 
 - (BOOL)_useSystemAppearance
@@ -6787,6 +7185,16 @@ static WebCore::UserInterfaceLayoutDirection toUserInterfaceLayoutDirection(UISe
     });
 }
 
+- (BOOL)_scrollingUpdatesDisabledForTesting
+{
+    // For subclasses to override;
+    return NO;
+}
+
+- (void)_setScrollingUpdatesDisabledForTesting:(BOOL)disabled
+{
+}
+
 // Execute the supplied block after the next transaction from the WebProcess.
 - (void)_doAfterNextPresentationUpdate:(void (^)(void))updateBlock
 {
@@ -6849,6 +7257,10 @@ static WebCore::UserInterfaceLayoutDirection toUserInterfaceLayoutDirection(UISe
 
 #endif // PLATFORM(IOS_FAMILY)
 
+#if USE(APPLE_INTERNAL_SDK)
+#include <WebKitAdditions/WKWebViewAdditions.mm>
+#endif
+
 - (BOOL)_beginBackSwipeForTesting
 {
 #if PLATFORM(MAC)
@@ -6881,6 +7293,11 @@ static WebCore::UserInterfaceLayoutDirection toUserInterfaceLayoutDirection(UISe
     _resolutionForShareSheetImmediateCompletionForTesting = resolved;
 }
 
+- (BOOL)_hasInspectorFrontend
+{
+    return _page && _page->hasInspectorFrontend();
+}
+
 - (_WKInspector *)_inspector
 {
     if (auto* inspector = _page->inspector())
@@ -6895,6 +7312,18 @@ static WebCore::UserInterfaceLayoutDirection toUserInterfaceLayoutDirection(UISe
     return nil;
 }
 
+- (void)_processWillSuspendImminentlyForTesting
+{
+    if (_page)
+        _page->process().sendProcessWillSuspendImminently();
+}
+
+- (void)_processDidResumeForTesting
+{
+    if (_page)
+        _page->process().sendProcessDidResume();
+}
+
 - (void)_denyNextUserMediaRequest
 {
 #if ENABLE(MEDIA_STREAM)
@@ -7035,6 +7464,4 @@ static WebCore::UserInterfaceLayoutDirection toUserInterfaceLayoutDirection(UISe
 
 @end
 
-#endif // WK_API_ENABLED
-
 #undef RELEASE_LOG_IF_ALLOWED