Attachment 347351 Details for Bug 188692 – Cleanup

[patch] Cleanup

bug-188692-20180816224053.patch (text/plain), 189.35 KB, created by Ryosuke Niwa on 2018-08-16 22:40:54 PDT

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Creator: Ryosuke Niwa

Created: 2018-08-16 22:40:54 PDT

Size: 189.35 KB

patch

obsolete

>Index: Source/WebCore/ChangeLog
>===================================================================
>--- Source/WebCore/ChangeLog	(revision 234910)
>+++ Source/WebCore/ChangeLog	(working copy)
>@@ -1,3 +1,374 @@
>+2018-08-16  Ryosuke Niwa  <rniwa@webkit.org>
>+
>+        Replace canBubble and cancelable booleans in Event by enum classes
>+        https://bugs.webkit.org/show_bug.cgi?id=188692
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Replaced booleans indicating whether an event can bubble and an event is cancelable
>+        by two enum classes: CanBubble and IsCancelable.
>+
>+        No new tests since there should be no behavioral changes.
>+
>+        * Modules/airplay/WebKitPlaybackTargetAvailabilityEvent.cpp:
>+        (WebCore::WebKitPlaybackTargetAvailabilityEvent::WebKitPlaybackTargetAvailabilityEvent):
>+        * Modules/applepay/ApplePayPaymentAuthorizedEvent.cpp:
>+        (WebCore::ApplePayPaymentAuthorizedEvent::ApplePayPaymentAuthorizedEvent):
>+        * Modules/applepay/ApplePayPaymentMethodSelectedEvent.cpp:
>+        (WebCore::ApplePayPaymentMethodSelectedEvent::ApplePayPaymentMethodSelectedEvent):
>+        * Modules/applepay/ApplePaySession.cpp:
>+        (WebCore::ApplePaySession::didCancelPaymentSession):
>+        * Modules/applepay/ApplePayShippingContactSelectedEvent.cpp:
>+        (WebCore::ApplePayShippingContactSelectedEvent::ApplePayShippingContactSelectedEvent):
>+        * Modules/applepay/ApplePayShippingMethodSelectedEvent.cpp:
>+        (WebCore::ApplePayShippingMethodSelectedEvent::ApplePayShippingMethodSelectedEvent):
>+        * Modules/applepay/ApplePayValidateMerchantEvent.cpp:
>+        (WebCore::ApplePayValidateMerchantEvent::ApplePayValidateMerchantEvent):
>+        * Modules/encryptedmedia/MediaKeySession.cpp:
>+        (WebCore::MediaKeySession::updateKeyStatuses):
>+        * Modules/encryptedmedia/legacy/WebKitMediaKeyMessageEvent.cpp:
>+        (WebCore::WebKitMediaKeyMessageEvent::WebKitMediaKeyMessageEvent):
>+        * Modules/encryptedmedia/legacy/WebKitMediaKeyNeededEvent.cpp:
>+        (WebCore::WebKitMediaKeyNeededEvent::WebKitMediaKeyNeededEvent):
>+        * Modules/encryptedmedia/legacy/WebKitMediaKeySession.cpp:
>+        (WebCore::WebKitMediaKeySession::addKeyTimerFired):
>+        (WebCore::WebKitMediaKeySession::sendError):
>+        * Modules/gamepad/GamepadEvent.cpp:
>+        (WebCore::GamepadEvent::GamepadEvent):
>+        * Modules/indexeddb/IDBDatabase.cpp:
>+        (WebCore::IDBDatabase::connectionToServerLost):
>+        * Modules/indexeddb/IDBOpenDBRequest.cpp:
>+        (WebCore::IDBOpenDBRequest::onError):
>+        (WebCore::IDBOpenDBRequest::fireSuccessAfterVersionChangeCommit):
>+        (WebCore::IDBOpenDBRequest::fireErrorAfterVersionChangeCompletion):
>+        (WebCore::IDBOpenDBRequest::onSuccess):
>+        * Modules/indexeddb/IDBRequest.cpp:
>+        (WebCore::IDBRequest::onError):
>+        (WebCore::IDBRequest::onSuccess):
>+        * Modules/indexeddb/IDBRequestCompletionEvent.cpp:
>+        (WebCore::IDBRequestCompletionEvent::IDBRequestCompletionEvent):
>+        * Modules/indexeddb/IDBRequestCompletionEvent.h:
>+        (WebCore::IDBRequestCompletionEvent::create):
>+        * Modules/indexeddb/IDBTransaction.cpp:
>+        (WebCore::IDBTransaction::fireOnComplete):
>+        (WebCore::IDBTransaction::fireOnAbort):
>+        * Modules/indexeddb/IDBVersionChangeEvent.cpp:
>+        (WebCore::IDBVersionChangeEvent::IDBVersionChangeEvent):
>+        * Modules/mediasession/MediaSession.cpp:
>+        (WebCore::MediaSession::skipToNextTrack):
>+        (WebCore::MediaSession::skipToPreviousTrack):
>+        * Modules/mediasource/MediaSource.cpp:
>+        (WebCore::MediaSource::scheduleEvent):
>+        * Modules/mediasource/SourceBuffer.cpp:
>+        (WebCore::SourceBuffer::scheduleEvent):
>+        * Modules/mediasource/SourceBufferList.cpp:
>+        (WebCore::SourceBufferList::scheduleEvent):
>+        * Modules/mediastream/MediaDevices.cpp:
>+        (WebCore::MediaDevices::scheduledEventTimerFired):
>+        * Modules/mediastream/MediaStream.cpp:
>+        (WebCore::MediaStream::internalAddTrack):
>+        (WebCore::MediaStream::internalRemoveTrack):
>+        * Modules/mediastream/MediaStreamEvent.cpp:
>+        (WebCore::MediaStreamEvent::create):
>+        (WebCore::MediaStreamEvent::MediaStreamEvent):
>+        * Modules/mediastream/MediaStreamEvent.h:
>+        * Modules/mediastream/MediaStreamTrack.cpp:
>+        (WebCore::MediaStreamTrack::trackEnded):
>+        (WebCore::MediaStreamTrack::trackMutedChanged):
>+        * Modules/mediastream/MediaStreamTrackEvent.cpp:
>+        (WebCore::MediaStreamTrackEvent::create):
>+        (WebCore::MediaStreamTrackEvent::MediaStreamTrackEvent):
>+        * Modules/mediastream/MediaStreamTrackEvent.h:
>+        * Modules/mediastream/OverconstrainedErrorEvent.h:
>+        (WebCore::OverconstrainedErrorEvent::create):
>+        (WebCore::OverconstrainedErrorEvent::OverconstrainedErrorEvent):
>+        * Modules/mediastream/PeerConnectionBackend.cpp:
>+        (WebCore::PeerConnectionBackend::fireICECandidateEvent):
>+        (WebCore::PeerConnectionBackend::doneGatheringCandidates):
>+        (WebCore::PeerConnectionBackend::updateSignalingState):
>+        * Modules/mediastream/RTCDTMFToneChangeEvent.cpp:
>+        (WebCore::RTCDTMFToneChangeEvent::RTCDTMFToneChangeEvent):
>+        * Modules/mediastream/RTCDataChannel.cpp:
>+        (WebCore::RTCDataChannel::didChangeReadyState):
>+        (WebCore::RTCDataChannel::didDetectError):
>+        (WebCore::RTCDataChannel::bufferedAmountIsDecreasing):
>+        * Modules/mediastream/RTCDataChannelEvent.cpp:
>+        (WebCore::RTCDataChannelEvent::create):
>+        (WebCore::RTCDataChannelEvent::RTCDataChannelEvent):
>+        * Modules/mediastream/RTCDataChannelEvent.h:
>+        * Modules/mediastream/RTCPeerConnection.cpp:
>+        (WebCore::RTCPeerConnection::updateIceGatheringState):
>+        (WebCore::RTCPeerConnection::updateIceConnectionState):
>+        (WebCore::RTCPeerConnection::updateConnectionState):
>+        (WebCore::RTCPeerConnection::scheduleNegotiationNeededEvent):
>+        * Modules/mediastream/RTCPeerConnectionIceEvent.cpp:
>+        (WebCore::RTCPeerConnectionIceEvent::create):
>+        (WebCore::RTCPeerConnectionIceEvent::RTCPeerConnectionIceEvent):
>+        * Modules/mediastream/RTCPeerConnectionIceEvent.h:
>+        * Modules/mediastream/RTCTrackEvent.cpp:
>+        (WebCore::RTCTrackEvent::create):
>+        (WebCore::RTCTrackEvent::RTCTrackEvent):
>+        * Modules/mediastream/RTCTrackEvent.h:
>+        * Modules/mediastream/libwebrtc/LibWebRTCMediaEndpoint.cpp:
>+        (WebCore::LibWebRTCMediaEndpoint::addRemoteStream):
>+        (WebCore::LibWebRTCMediaEndpoint::addRemoteTrack):
>+        (WebCore::LibWebRTCMediaEndpoint::addDataChannel):
>+        * Modules/notifications/Notification.cpp:
>+        (WebCore::Notification::dispatchShowEvent):
>+        (WebCore::Notification::dispatchClickEvent):
>+        (WebCore::Notification::dispatchCloseEvent):
>+        (WebCore::Notification::dispatchErrorEvent):
>+        * Modules/paymentrequest/MerchantValidationEvent.cpp:
>+        (WebCore::MerchantValidationEvent::MerchantValidationEvent):
>+        * Modules/paymentrequest/PaymentRequestUpdateEvent.cpp:
>+        (WebCore::PaymentRequestUpdateEvent::PaymentRequestUpdateEvent):
>+        * Modules/plugins/QuickTimePluginReplacement.mm:
>+        (WebCore::QuickTimePluginReplacement::postEvent):
>+        * Modules/speech/SpeechSynthesisEvent.cpp:
>+        (WebCore::SpeechSynthesisEvent::SpeechSynthesisEvent):
>+        * Modules/webaudio/AudioContext.cpp:
>+        (WebCore::AudioContext::setState):
>+        * Modules/webaudio/AudioProcessingEvent.cpp:
>+        (WebCore::AudioProcessingEvent::AudioProcessingEvent):
>+        * Modules/webaudio/AudioScheduledSourceNode.cpp:
>+        (WebCore::AudioScheduledSourceNode::finish):
>+        * Modules/webaudio/OfflineAudioCompletionEvent.cpp:
>+        (WebCore::OfflineAudioCompletionEvent::OfflineAudioCompletionEvent):
>+        * Modules/websockets/CloseEvent.h:
>+        (WebCore::CloseEvent::CloseEvent):
>+        * Modules/websockets/WebSocket.cpp:
>+        (WebCore::WebSocket::didConnect):
>+        (WebCore::WebSocket::dispatchOrQueueErrorEvent):
>+        * Modules/webvr/VRDisplayEvent.cpp:
>+        (WebCore::VRDisplayEvent::VRDisplayEvent):
>+        * accessibility/AccessibilityObject.cpp:
>+        (WebCore::AccessibilityObject::dispatchAccessibilityEventWithType const):
>+        * accessibility/AccessibleSetValueEvent.cpp:
>+        (WebCore::AccessibleSetValueEvent::AccessibleSetValueEvent):
>+        * animation/AnimationPlaybackEvent.cpp:
>+        (WebCore::AnimationPlaybackEvent::AnimationPlaybackEvent):
>+        * dom/AbortSignal.cpp:
>+        (WebCore::AbortSignal::abort):
>+        * dom/AnimationEvent.cpp:
>+        (WebCore::AnimationEvent::AnimationEvent):
>+        * dom/BeforeLoadEvent.h:
>+        * dom/BeforeTextInsertedEvent.cpp:
>+        (WebCore::BeforeTextInsertedEvent::BeforeTextInsertedEvent):
>+        * dom/BeforeUnloadEvent.cpp:
>+        (WebCore::BeforeUnloadEvent::BeforeUnloadEvent):
>+        * dom/CharacterData.cpp:
>+        (WebCore::CharacterData::dispatchModifiedEvent):
>+        * dom/CompositionEvent.cpp:
>+        (WebCore::CompositionEvent::CompositionEvent):
>+        * dom/ContainerNode.cpp:
>+        (WebCore::dispatchChildInsertionEvents):
>+        (WebCore::dispatchChildRemovalEvents):
>+        * dom/DeviceMotionEvent.cpp:
>+        (WebCore::DeviceMotionEvent::DeviceMotionEvent):
>+        * dom/DeviceOrientationEvent.cpp:
>+        (WebCore::DeviceOrientationEvent::DeviceOrientationEvent):
>+        * dom/Document.cpp:
>+        (WebCore::Document::setReadyState):
>+        (WebCore::Document::visibilityStateChanged):
>+        (WebCore::Document::finishedParsing):
>+        (WebCore::Document::dispatchFullScreenChangeOrErrorEvent):
>+        (WebCore::Document::orientationChanged):
>+        * dom/DocumentEventQueue.cpp:
>+        (WebCore::DocumentEventQueue::enqueueOrDispatchScrollEvent):
>+        (WebCore::DocumentEventQueue::enqueueScrollEvent):
>+        (WebCore::DocumentEventQueue::enqueueResizeEvent):
>+        * dom/DocumentEventQueue.h:
>+        * dom/Element.cpp:
>+        (WebCore::Element::dispatchMouseEvent):
>+        (WebCore::Element::dispatchFocusInEvent):
>+        (WebCore::Element::dispatchFocusOutEvent):
>+        (WebCore::Element::dispatchFocusEvent):
>+        (WebCore::Element::dispatchBlurEvent):
>+        (WebCore::Element::dispatchWebKitImageReadyEventForTesting):
>+        * dom/ErrorEvent.cpp:
>+        (WebCore::ErrorEvent::ErrorEvent):
>+        * dom/Event.cpp:
>+        (WebCore::Event::Event):
>+        (WebCore::Event::create):
>+        * dom/Event.h:
>+        * dom/FocusEvent.cpp:
>+        (WebCore::FocusEvent::FocusEvent):
>+        * dom/FocusEvent.h:
>+        * dom/HashChangeEvent.h:
>+        * dom/InputEvent.cpp:
>+        (WebCore::InputEvent::create):
>+        (WebCore::InputEvent::InputEvent):
>+        * dom/InputEvent.h:
>+        * dom/KeyboardEvent.cpp:
>+        (WebCore::KeyboardEvent::KeyboardEvent):
>+        * dom/MessageEvent.cpp:
>+        (WebCore::MessageEvent::MessageEvent):
>+        * dom/MouseEvent.cpp:
>+        (WebCore::MouseEvent::create):
>+        (WebCore::MouseEvent::MouseEvent):
>+        * dom/MouseEvent.h:
>+        * dom/MouseRelatedEvent.cpp:
>+        (WebCore::MouseRelatedEvent::MouseRelatedEvent):
>+        * dom/MouseRelatedEvent.h:
>+        * dom/MutationEvent.cpp:
>+        (WebCore::MutationEvent::MutationEvent):
>+        * dom/MutationEvent.h:
>+        * dom/Node.cpp:
>+        (WebCore::Node::dispatchSubtreeModifiedEvent):
>+        (WebCore::Node::dispatchDOMActivateEvent):
>+        (WebCore::Node::dispatchInputEvent):
>+        * dom/OverflowEvent.cpp:
>+        (WebCore::OverflowEvent::OverflowEvent):
>+        * dom/PageTransitionEvent.cpp:
>+        (WebCore::PageTransitionEvent::PageTransitionEvent):
>+        * dom/PopStateEvent.cpp:
>+        (WebCore::PopStateEvent::PopStateEvent):
>+        * dom/ProgressEvent.cpp:
>+        (WebCore::ProgressEvent::ProgressEvent):
>+        * dom/ScriptElement.cpp:
>+        (WebCore::ScriptElement::dispatchErrorEvent):
>+        * dom/SecurityPolicyViolationEvent.h:
>+        * dom/SimulatedClick.cpp:
>+        * dom/TextEvent.cpp:
>+        (WebCore::TextEvent::TextEvent):
>+        * dom/TransitionEvent.cpp:
>+        (WebCore::TransitionEvent::TransitionEvent):
>+        * dom/UIEvent.cpp:
>+        (WebCore::UIEvent::UIEvent):
>+        * dom/UIEvent.h:
>+        (WebCore::UIEvent::create):
>+        * dom/UIEventWithKeyState.h:
>+        (WebCore::UIEventWithKeyState::UIEventWithKeyState):
>+        * dom/WebKitAnimationEvent.cpp:
>+        (WebCore::WebKitAnimationEvent::WebKitAnimationEvent):
>+        * dom/WebKitTransitionEvent.cpp:
>+        (WebCore::WebKitTransitionEvent::WebKitTransitionEvent):
>+        * dom/WheelEvent.cpp:
>+        (WebCore::WheelEvent::WheelEvent):
>+        * editing/Editor.cpp:
>+        (WebCore::dispatchBeforeInputEvent):
>+        (WebCore::dispatchBeforeInputEvents):
>+        (WebCore::Editor::willApplyEditing const):
>+        * editing/FrameSelection.cpp:
>+        (WebCore::FrameSelection::setSelectionWithoutUpdatingAppearance):
>+        (WebCore::FrameSelection::selectAll):
>+        (WebCore::FrameSelection::dispatchSelectStart):
>+        * html/HTMLDetailsElement.cpp:
>+        (WebCore::HTMLDetailsElement::dispatchPendingEvent):
>+        * html/HTMLFormControlElement.cpp:
>+        (WebCore::HTMLFormControlElement::dispatchChangeEvent):
>+        (WebCore::HTMLFormControlElement::checkValidity):
>+        * html/HTMLFormElement.cpp:
>+        (WebCore::HTMLFormElement::prepareForSubmission):
>+        (WebCore::HTMLFormElement::reset):
>+        * html/HTMLImageLoader.cpp:
>+        (WebCore::HTMLImageLoader::dispatchLoadEvent):
>+        * html/HTMLInputElement.cpp:
>+        (WebCore::HTMLInputElement::onSearch):
>+        * html/HTMLLinkElement.cpp:
>+        (WebCore::HTMLLinkElement::dispatchPendingEvent):
>+        * html/HTMLMediaElement.cpp:
>+        (WebCore::HTMLMediaElement::scheduleEvent):
>+        (WebCore::HTMLMediaElement::notifyAboutPlaying):
>+        (WebCore::HTMLMediaElement::updateActiveTextTrackCues):
>+        (WebCore::HTMLMediaElement::layoutSizeChanged):
>+        * html/HTMLPlugInImageElement.cpp:
>+        (WebCore::HTMLPlugInImageElement::checkSnapshotStatus):
>+        * html/HTMLScriptElement.cpp:
>+        (WebCore::HTMLScriptElement::dispatchLoadEvent):
>+        * html/HTMLSlotElement.cpp:
>+        (WebCore::HTMLSlotElement::dispatchSlotChangeEvent):
>+        * html/HTMLSourceElement.cpp:
>+        (WebCore::HTMLSourceElement::errorEventTimerFired):
>+        * html/HTMLStyleElement.cpp:
>+        (WebCore::HTMLStyleElement::dispatchPendingEvent):
>+        * html/HTMLTextFormControlElement.cpp:
>+        (WebCore::HTMLTextFormControlElement::selectionChanged):
>+        * html/HTMLTrackElement.cpp:
>+        (WebCore::HTMLTrackElement::didCompleteLoad):
>+        * html/MediaController.cpp:
>+        (WebCore::MediaController::scheduleEvent):
>+        * html/canvas/WebGLContextEvent.cpp:
>+        (WebCore::WebGLContextEvent::WebGLContextEvent):
>+        * html/canvas/WebGLContextEvent.h:
>+        * html/canvas/WebGLRenderingContextBase.cpp:
>+        (WebCore::WebGLRenderingContextBase::create):
>+        (WebCore::WebGLRenderingContextBase::dispatchContextLostEvent):
>+        (WebCore::WebGLRenderingContextBase::maybeRestoreContext):
>+        (WebCore::WebGLRenderingContextBase::dispatchContextChangedEvent):
>+        * html/parser/HTMLScriptRunner.cpp:
>+        (WebCore::createScriptLoadEvent):
>+        * html/track/TrackEvent.cpp:
>+        (WebCore::TrackEvent::TrackEvent):
>+        * html/track/TrackEvent.h:
>+        * html/track/TrackListBase.cpp:
>+        (WebCore::TrackListBase::scheduleTrackEvent):
>+        (WebCore::TrackListBase::scheduleChangeEvent):
>+        * loader/DocumentLoader.cpp:
>+        (WebCore::DocumentLoader::stopLoadingAfterXFrameOptionsOrContentSecurityPolicyDenied):
>+        * loader/FrameLoader.cpp:
>+        (WebCore::FrameLoader::dispatchUnloadEvents):
>+        * loader/ImageLoader.cpp:
>+        (WebCore::ImageLoader::dispatchPendingErrorEvent):
>+        * loader/PolicyChecker.cpp:
>+        (WebCore::PolicyChecker::checkNavigationPolicy):
>+        * loader/appcache/ApplicationCacheHost.cpp:
>+        (WebCore::createApplicationCacheEvent):
>+        * page/DOMWindow.cpp:
>+        (WebCore::DOMWindow::dispatchAllPendingUnloadEvents):
>+        (WebCore::DOMWindow::languagesChanged):
>+        (WebCore::DOMWindow::dispatchLoadEvent):
>+        * page/EventHandler.cpp:
>+        (WebCore::dispatchSelectStart):
>+        (WebCore::EventHandler::dispatchDragEvent):
>+        * page/EventSource.cpp:
>+        (WebCore::EventSource::scheduleReconnect):
>+        (WebCore::EventSource::didReceiveResponse):
>+        (WebCore::EventSource::abortConnectionAttempt):
>+        * page/FocusController.cpp:
>+        (WebCore::dispatchEventsOnWindowAndFocusedElement):
>+        (WebCore::FocusController::setFocusedFrame):
>+        * page/FrameView.cpp:
>+        (WebCore::FrameView::sendResizeEventIfNeeded):
>+        * page/Page.cpp:
>+        (WebCore::networkStateChanged):
>+        * page/Performance.cpp:
>+        (WebCore::Performance::resourceTimingBufferFullTimerFired):
>+        * page/PointerLockController.cpp:
>+        (WebCore::PointerLockController::enqueueEvent):
>+        * page/VisualViewport.cpp:
>+        (WebCore::VisualViewport::enqueueResizeEvent):
>+        (WebCore::VisualViewport::enqueueScrollEvent):
>+        * storage/StorageEvent.cpp:
>+        (WebCore::StorageEvent::StorageEvent):
>+        * svg/SVGElement.cpp:
>+        (WebCore::SVGElement::sendSVGLoadEventIfPossible):
>+        * svg/SVGImageLoader.cpp:
>+        (WebCore::SVGImageLoader::dispatchLoadEvent):
>+        * svg/SVGUseElement.cpp:
>+        (WebCore::SVGUseElement::notifyFinished):
>+        * svg/animation/SVGSMILElement.cpp:
>+        (WebCore::SVGSMILElement::dispatchPendingEvent):
>+        * workers/Worker.cpp:
>+        (WebCore::Worker::notifyFinished):
>+        * workers/WorkerMessagingProxy.cpp:
>+        (WebCore::WorkerMessagingProxy::notifyNetworkStateChange):
>+        * workers/service/ExtendableEvent.cpp:
>+        (WebCore::ExtendableEvent::ExtendableEvent):
>+        * workers/service/ExtendableEvent.h:
>+        * workers/service/ExtendableMessageEvent.cpp:
>+        (WebCore::ExtendableMessageEvent::ExtendableMessageEvent):
>+        * workers/service/ServiceWorker.cpp:
>+        (WebCore::ServiceWorker::scheduleTaskToUpdateState):
>+        * workers/service/ServiceWorkerContainer.cpp:
>+        (WebCore::ServiceWorkerContainer::scheduleTaskToFireControllerChangeEvent):
>+        * workers/service/ServiceWorkerRegistration.cpp:
>+        (WebCore::ServiceWorkerRegistration::scheduleTaskToFireUpdateFoundEvent):
>+        * workers/service/context/ServiceWorkerThreadProxy.cpp:
>+        (WebCore::ServiceWorkerThreadProxy::notifyNetworkStateChange):
>+        * xml/XMLHttpRequest.cpp:
>+        (WebCore::XMLHttpRequest::callReadyStateChangeListener):
>+
> 2018-08-15  Ben Richards  <benton_richards@apple.com>
> 
>         We should cache the compiled sandbox profile in a data vault
>Index: Source/WebCore/Modules/airplay/WebKitPlaybackTargetAvailabilityEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/airplay/WebKitPlaybackTargetAvailabilityEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/airplay/WebKitPlaybackTargetAvailabilityEvent.cpp	(working copy)
>@@ -41,7 +41,7 @@ static const AtomicString& stringForPlay
> }
> 
> WebKitPlaybackTargetAvailabilityEvent::WebKitPlaybackTargetAvailabilityEvent(const AtomicString& eventType, bool available)
>-    : Event(eventType, false, false)
>+    : Event(eventType, CanBubble::No, IsCancelable::No)
>     , m_availability(stringForPlaybackTargetAvailability(available))
> {
> }
>Index: Source/WebCore/Modules/applepay/ApplePayPaymentAuthorizedEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/applepay/ApplePayPaymentAuthorizedEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/applepay/ApplePayPaymentAuthorizedEvent.cpp	(working copy)
>@@ -33,7 +33,7 @@
> namespace WebCore {
> 
> ApplePayPaymentAuthorizedEvent::ApplePayPaymentAuthorizedEvent(const AtomicString& type, unsigned version, const Payment& payment)
>-    : Event(type, false, false)
>+    : Event(type, CanBubble::No, IsCancelable::No)
>     , m_payment(payment.toApplePayPayment(version))
> {
> }
>Index: Source/WebCore/Modules/applepay/ApplePayPaymentMethodSelectedEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/applepay/ApplePayPaymentMethodSelectedEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/applepay/ApplePayPaymentMethodSelectedEvent.cpp	(working copy)
>@@ -33,7 +33,7 @@
> namespace WebCore {
> 
> ApplePayPaymentMethodSelectedEvent::ApplePayPaymentMethodSelectedEvent(const AtomicString& type, const PaymentMethod& paymentMethod)
>-    : Event(type, false, false)
>+    : Event(type, CanBubble::No, IsCancelable::No)
>     , m_paymentMethod(paymentMethod.toApplePayPaymentMethod())
> {
> }
>Index: Source/WebCore/Modules/applepay/ApplePaySession.cpp
>===================================================================
>--- Source/WebCore/Modules/applepay/ApplePaySession.cpp	(revision 234910)
>+++ Source/WebCore/Modules/applepay/ApplePaySession.cpp	(working copy)
>@@ -840,7 +840,7 @@ void ApplePaySession::didCancelPaymentSe
> 
>     m_state = State::Canceled;
> 
>-    auto event = Event::create(eventNames().cancelEvent, false, false);
>+    auto event = Event::create(eventNames().cancelEvent, Event::CanBubble::No, Event::IsCancelable::No);
>     dispatchEvent(event.get());
> 
>     didReachFinalState();
>Index: Source/WebCore/Modules/applepay/ApplePayShippingContactSelectedEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/applepay/ApplePayShippingContactSelectedEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/applepay/ApplePayShippingContactSelectedEvent.cpp	(working copy)
>@@ -33,7 +33,7 @@
> namespace WebCore {
> 
> ApplePayShippingContactSelectedEvent::ApplePayShippingContactSelectedEvent(const AtomicString& type, unsigned version, const PaymentContact& shippingContact)
>-    : Event(type, false, false)
>+    : Event(type, CanBubble::No, IsCancelable::No)
>     , m_shippingContact(shippingContact.toApplePayPaymentContact(version))
> {
> }
>Index: Source/WebCore/Modules/applepay/ApplePayShippingMethodSelectedEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/applepay/ApplePayShippingMethodSelectedEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/applepay/ApplePayShippingMethodSelectedEvent.cpp	(working copy)
>@@ -44,7 +44,7 @@ static inline ApplePayShippingMethod con
> }
> 
> ApplePayShippingMethodSelectedEvent::ApplePayShippingMethodSelectedEvent(const AtomicString& type, const ApplePaySessionPaymentRequest::ShippingMethod& shippingMethod)
>-    : Event(type, false, false)
>+    : Event(type, CanBubble::No, IsCancelable::No)
>     , m_shippingMethod(convert(shippingMethod))
> {
> }
>Index: Source/WebCore/Modules/applepay/ApplePayValidateMerchantEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/applepay/ApplePayValidateMerchantEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/applepay/ApplePayValidateMerchantEvent.cpp	(working copy)
>@@ -31,7 +31,7 @@
> namespace WebCore {
> 
> ApplePayValidateMerchantEvent::ApplePayValidateMerchantEvent(const AtomicString& type, const URL& validationURL)
>-    : Event(type, false, false)
>+    : Event(type, CanBubble::No, IsCancelable::No)
>     , m_validationURL(validationURL)
> {
> }
>Index: Source/WebCore/Modules/encryptedmedia/MediaKeySession.cpp
>===================================================================
>--- Source/WebCore/Modules/encryptedmedia/MediaKeySession.cpp	(revision 234910)
>+++ Source/WebCore/Modules/encryptedmedia/MediaKeySession.cpp	(working copy)
>@@ -641,7 +641,7 @@ void MediaKeySession::updateKeyStatuses(
>         m_statuses.uncheckedAppend({ WTFMove(status.first), toMediaKeyStatus(status.second) });
> 
>     // 5. Queue a task to fire a simple event named keystatuseschange at the session.
>-    m_eventQueue.enqueueEvent(Event::create(eventNames().keystatuseschangeEvent, false, false));
>+    m_eventQueue.enqueueEvent(Event::create(eventNames().keystatuseschangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
> 
>     // 6. Queue a task to run the Attempt to Resume Playback If Necessary algorithm on each of the media element(s) whose mediaKeys attribute is the MediaKeys object that created the session.
>     m_taskQueue.enqueueTask(
>Index: Source/WebCore/Modules/encryptedmedia/legacy/WebKitMediaKeyMessageEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/encryptedmedia/legacy/WebKitMediaKeyMessageEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/encryptedmedia/legacy/WebKitMediaKeyMessageEvent.cpp	(working copy)
>@@ -33,7 +33,7 @@
> namespace WebCore {
> 
> WebKitMediaKeyMessageEvent::WebKitMediaKeyMessageEvent(const AtomicString& type, Uint8Array* message, const String& destinationURL)
>-    : Event(type, false, false)
>+    : Event(type, CanBubble::No, IsCancelable::No)
>     , m_message(message)
>     , m_destinationURL(destinationURL)
> {
>Index: Source/WebCore/Modules/encryptedmedia/legacy/WebKitMediaKeyNeededEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/encryptedmedia/legacy/WebKitMediaKeyNeededEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/encryptedmedia/legacy/WebKitMediaKeyNeededEvent.cpp	(working copy)
>@@ -33,7 +33,7 @@
> namespace WebCore {
> 
> WebKitMediaKeyNeededEvent::WebKitMediaKeyNeededEvent(const AtomicString& type, Uint8Array* initData)
>-    : Event(type, false, false)
>+    : Event(type, CanBubble::No, IsCancelable::No)
>     , m_initData(initData)
> {
> }
>Index: Source/WebCore/Modules/encryptedmedia/legacy/WebKitMediaKeySession.cpp
>===================================================================
>--- Source/WebCore/Modules/encryptedmedia/legacy/WebKitMediaKeySession.cpp	(revision 234910)
>+++ Source/WebCore/Modules/encryptedmedia/legacy/WebKitMediaKeySession.cpp	(working copy)
>@@ -179,7 +179,7 @@ void WebKitMediaKeySession::addKeyTimerF
> 
>         // 2.7. If did store key is true, queue a task to fire a simple event named keyadded at the MediaKeySession object.
>         if (didStoreKey) {
>-            auto keyaddedEvent = Event::create(eventNames().webkitkeyaddedEvent, false, false);
>+            auto keyaddedEvent = Event::create(eventNames().webkitkeyaddedEvent, Event::CanBubble::No, Event::IsCancelable::No);
>             keyaddedEvent->setTarget(this);
>             m_asyncEventQueue.enqueueEvent(WTFMove(keyaddedEvent));
> 
>@@ -212,7 +212,7 @@ void WebKitMediaKeySession::sendError(Me
> {
>     m_error = WebKitMediaKeyError::create(errorCode, systemCode);
> 
>-    auto keyerrorEvent = Event::create(eventNames().webkitkeyerrorEvent, false, false);
>+    auto keyerrorEvent = Event::create(eventNames().webkitkeyerrorEvent, Event::CanBubble::No, Event::IsCancelable::No);
>     keyerrorEvent->setTarget(this);
>     m_asyncEventQueue.enqueueEvent(WTFMove(keyerrorEvent));
> }
>Index: Source/WebCore/Modules/gamepad/GamepadEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/gamepad/GamepadEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/gamepad/GamepadEvent.cpp	(working copy)
>@@ -30,7 +30,7 @@
> namespace WebCore {
> 
> GamepadEvent::GamepadEvent(const AtomicString& eventType, Gamepad& gamepad)
>-    : Event(eventType, false, false)
>+    : Event(eventType, CanBubble::No, IsCancelable::No)
>     , m_gamepad(&gamepad)
> {
> }
>Index: Source/WebCore/Modules/indexeddb/IDBDatabase.cpp
>===================================================================
>--- Source/WebCore/Modules/indexeddb/IDBDatabase.cpp	(revision 234910)
>+++ Source/WebCore/Modules/indexeddb/IDBDatabase.cpp	(working copy)
>@@ -267,13 +267,13 @@ void IDBDatabase::connectionToServerLost
>     for (auto& transaction : m_activeTransactions.values())
>         transaction->connectionClosedFromServer(error);
> 
>-    auto errorEvent = Event::create(m_eventNames.errorEvent, true, false);
>+    auto errorEvent = Event::create(m_eventNames.errorEvent, Event::CanBubble::Yes, Event::IsCancelable::No);
>     errorEvent->setTarget(this);
> 
>     if (auto* context = scriptExecutionContext())
>         context->eventQueue().enqueueEvent(WTFMove(errorEvent));
> 
>-    auto closeEvent = Event::create(m_eventNames.closeEvent, true, false);
>+    auto closeEvent = Event::create(m_eventNames.closeEvent, Event::CanBubble::Yes, Event::IsCancelable::No);
>     closeEvent->setTarget(this);
> 
>     if (auto* context = scriptExecutionContext())
>Index: Source/WebCore/Modules/indexeddb/IDBOpenDBRequest.cpp
>===================================================================
>--- Source/WebCore/Modules/indexeddb/IDBOpenDBRequest.cpp	(revision 234910)
>+++ Source/WebCore/Modules/indexeddb/IDBOpenDBRequest.cpp	(working copy)
>@@ -71,7 +71,7 @@ void IDBOpenDBRequest::onError(const IDB
>     ASSERT(&originThread() == &Thread::current());
> 
>     m_domError = data.error().toDOMException();
>-    enqueueEvent(IDBRequestCompletionEvent::create(eventNames().errorEvent, true, true, *this));
>+    enqueueEvent(IDBRequestCompletionEvent::create(eventNames().errorEvent, Event::CanBubble::Yes, Event::IsCancelable::Yes, *this));
> }
> 
> void IDBOpenDBRequest::versionChangeTransactionDidFinish()
>@@ -91,7 +91,7 @@ void IDBOpenDBRequest::fireSuccessAfterV
>     ASSERT(hasPendingActivity());
>     m_transaction->addRequest(*this);
> 
>-    auto event = IDBRequestCompletionEvent::create(eventNames().successEvent, false, false, *this);
>+    auto event = IDBRequestCompletionEvent::create(eventNames().successEvent, Event::CanBubble::No, Event::IsCancelable::No, *this);
>     m_openDatabaseSuccessEvent = &event.get();
> 
>     enqueueEvent(WTFMove(event));
>@@ -109,7 +109,7 @@ void IDBOpenDBRequest::fireErrorAfterVer
>     setResultToUndefined();
> 
>     m_transaction->addRequest(*this);
>-    enqueueEvent(IDBRequestCompletionEvent::create(eventNames().errorEvent, true, true, *this));
>+    enqueueEvent(IDBRequestCompletionEvent::create(eventNames().errorEvent, Event::CanBubble::Yes, Event::IsCancelable::Yes, *this));
> }
> 
> void IDBOpenDBRequest::cancelForStop()
>@@ -138,7 +138,7 @@ void IDBOpenDBRequest::onSuccess(const I
>     setResult(IDBDatabase::create(*scriptExecutionContext(), connectionProxy(), resultData));
>     m_readyState = ReadyState::Done;
> 
>-    enqueueEvent(IDBRequestCompletionEvent::create(eventNames().successEvent, false, false, *this));
>+    enqueueEvent(IDBRequestCompletionEvent::create(eventNames().successEvent, Event::CanBubble::No, Event::IsCancelable::No, *this));
> }
> 
> void IDBOpenDBRequest::onUpgradeNeeded(const IDBResultData& resultData)
>Index: Source/WebCore/Modules/indexeddb/IDBRequest.cpp
>===================================================================
>--- Source/WebCore/Modules/indexeddb/IDBRequest.cpp	(revision 234910)
>+++ Source/WebCore/Modules/indexeddb/IDBRequest.cpp	(working copy)
>@@ -528,15 +528,14 @@ void IDBRequest::onError()
>     ASSERT(!m_idbError.isNull());
> 
>     m_domError = m_idbError.toDOMException();
>-    enqueueEvent(Event::create(eventNames().errorEvent, true, true));
>+    enqueueEvent(Event::create(eventNames().errorEvent, Event::CanBubble::Yes, Event::IsCancelable::Yes));
> }
> 
> void IDBRequest::onSuccess()
> {
>     LOG(IndexedDB, "IDBRequest::onSuccess");
>     ASSERT(&originThread() == &Thread::current());
>-
>-    enqueueEvent(Event::create(eventNames().successEvent, false, false));
>+    enqueueEvent(Event::create(eventNames().successEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void IDBRequest::setResult(Ref<IDBDatabase>&& database)
>Index: Source/WebCore/Modules/indexeddb/IDBRequestCompletionEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/indexeddb/IDBRequestCompletionEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/indexeddb/IDBRequestCompletionEvent.cpp	(working copy)
>@@ -30,7 +30,7 @@
> 
> namespace WebCore {
> 
>-IDBRequestCompletionEvent::IDBRequestCompletionEvent(const AtomicString& type, bool canBubble, bool cancelable, IDBRequest& request)
>+IDBRequestCompletionEvent::IDBRequestCompletionEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, IDBRequest& request)
>     : Event(type, canBubble, cancelable)
>     , m_request(request)
> {
>Index: Source/WebCore/Modules/indexeddb/IDBRequestCompletionEvent.h
>===================================================================
>--- Source/WebCore/Modules/indexeddb/IDBRequestCompletionEvent.h	(revision 234910)
>+++ Source/WebCore/Modules/indexeddb/IDBRequestCompletionEvent.h	(working copy)
>@@ -34,13 +34,13 @@ namespace WebCore {
> 
> class IDBRequestCompletionEvent : public Event {
> public:
>-    static Ref<Event> create(const AtomicString& type, bool canBubble, bool cancelable, IDBRequest& request)
>+    static Ref<Event> create(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, IDBRequest& request)
>     {
>         return adoptRef(*new IDBRequestCompletionEvent(type, canBubble, cancelable, request));
>     }
> 
> private:
>-    IDBRequestCompletionEvent(const AtomicString& type, bool canBubble, bool cancelable, IDBRequest&);
>+    IDBRequestCompletionEvent(const AtomicString& type, CanBubble, IsCancelable, IDBRequest&);
> 
>     Ref<IDBRequest> m_request;
> };
>Index: Source/WebCore/Modules/indexeddb/IDBTransaction.cpp
>===================================================================
>--- Source/WebCore/Modules/indexeddb/IDBTransaction.cpp	(revision 234910)
>+++ Source/WebCore/Modules/indexeddb/IDBTransaction.cpp	(working copy)
>@@ -591,14 +591,14 @@ void IDBTransaction::fireOnComplete()
> {
>     LOG(IndexedDB, "IDBTransaction::fireOnComplete");
>     ASSERT(&m_database->originThread() == &Thread::current());
>-    enqueueEvent(Event::create(eventNames().completeEvent, false, false));
>+    enqueueEvent(Event::create(eventNames().completeEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void IDBTransaction::fireOnAbort()
> {
>     LOG(IndexedDB, "IDBTransaction::fireOnAbort");
>     ASSERT(&m_database->originThread() == &Thread::current());
>-    enqueueEvent(Event::create(eventNames().abortEvent, true, false));
>+    enqueueEvent(Event::create(eventNames().abortEvent, Event::CanBubble::Yes, Event::IsCancelable::No));
> }
> 
> void IDBTransaction::enqueueEvent(Ref<Event>&& event)
>Index: Source/WebCore/Modules/indexeddb/IDBVersionChangeEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/indexeddb/IDBVersionChangeEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/indexeddb/IDBVersionChangeEvent.cpp	(working copy)
>@@ -31,7 +31,7 @@
> namespace WebCore {
> 
> IDBVersionChangeEvent::IDBVersionChangeEvent(const IDBResourceIdentifier& requestIdentifier, uint64_t oldVersion, uint64_t newVersion, const AtomicString& name)
>-    : Event(name, false /*canBubble*/, false /*cancelable*/)
>+    : Event(name, CanBubble::No, IsCancelable::No)
>     , m_requestIdentifier(requestIdentifier)
>     , m_oldVersion(oldVersion)
> {
>Index: Source/WebCore/Modules/mediasession/MediaSession.cpp
>===================================================================
>--- Source/WebCore/Modules/mediasession/MediaSession.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediasession/MediaSession.cpp	(working copy)
>@@ -253,13 +253,13 @@ void MediaSession::safelyIterateActiveMe
> void MediaSession::skipToNextTrack()
> {
>     if (m_controls && m_controls->nextTrackEnabled())
>-        m_controls->dispatchEvent(Event::create(eventNames().nexttrackEvent, false, false));
>+        m_controls->dispatchEvent(Event::create(eventNames().nexttrackEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void MediaSession::skipToPreviousTrack()
> {
>     if (m_controls && m_controls->previousTrackEnabled())
>-        m_controls->dispatchEvent(Event::create(eventNames().previoustrackEvent, false, false));
>+        m_controls->dispatchEvent(Event::create(eventNames().previoustrackEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void MediaSession::controlIsEnabledDidChange()
>Index: Source/WebCore/Modules/mediasource/MediaSource.cpp
>===================================================================
>--- Source/WebCore/Modules/mediasource/MediaSource.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediasource/MediaSource.cpp	(working copy)
>@@ -1025,7 +1025,7 @@ ExceptionOr<Ref<SourceBufferPrivate>> Me
> 
> void MediaSource::scheduleEvent(const AtomicString& eventName)
> {
>-    auto event = Event::create(eventName, false, false);
>+    auto event = Event::create(eventName, Event::CanBubble::No, Event::IsCancelable::No);
>     event->setTarget(this);
> 
>     m_asyncEventQueue.enqueueEvent(WTFMove(event));
>Index: Source/WebCore/Modules/mediasource/SourceBuffer.cpp
>===================================================================
>--- Source/WebCore/Modules/mediasource/SourceBuffer.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediasource/SourceBuffer.cpp	(working copy)
>@@ -501,7 +501,7 @@ bool SourceBuffer::isRemoved() const
> 
> void SourceBuffer::scheduleEvent(const AtomicString& eventName)
> {
>-    auto event = Event::create(eventName, false, false);
>+    auto event = Event::create(eventName, Event::CanBubble::No, Event::IsCancelable::No);
>     event->setTarget(this);
> 
>     m_asyncEventQueue.enqueueEvent(WTFMove(event));
>Index: Source/WebCore/Modules/mediasource/SourceBufferList.cpp
>===================================================================
>--- Source/WebCore/Modules/mediasource/SourceBufferList.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediasource/SourceBufferList.cpp	(working copy)
>@@ -92,7 +92,7 @@ void SourceBufferList::swap(Vector<RefPt
> 
> void SourceBufferList::scheduleEvent(const AtomicString& eventName)
> {
>-    auto event = Event::create(eventName, false, false);
>+    auto event = Event::create(eventName, Event::CanBubble::No, Event::IsCancelable::No);
>     event->setTarget(this);
> 
>     m_asyncEventQueue.enqueueEvent(WTFMove(event));
>Index: Source/WebCore/Modules/mediastream/MediaDevices.cpp
>===================================================================
>--- Source/WebCore/Modules/mediastream/MediaDevices.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/MediaDevices.cpp	(working copy)
>@@ -163,7 +163,7 @@ MediaTrackSupportedConstraints MediaDevi
> void MediaDevices::scheduledEventTimerFired()
> {
>     if (scriptExecutionContext())
>-        dispatchEvent(Event::create(eventNames().devicechangeEvent, false, false));
>+        dispatchEvent(Event::create(eventNames().devicechangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> bool MediaDevices::hasPendingActivity() const
>Index: Source/WebCore/Modules/mediastream/MediaStream.cpp
>===================================================================
>--- Source/WebCore/Modules/mediastream/MediaStream.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/MediaStream.cpp	(working copy)
>@@ -227,7 +227,7 @@ bool MediaStream::internalAddTrack(Ref<M
>     if (streamModifier == StreamModifier::DomAPI)
>         m_private->addTrack(&track.privateTrack(), MediaStreamPrivate::NotifyClientOption::DontNotify);
>     else
>-        dispatchEvent(MediaStreamTrackEvent::create(eventNames().addtrackEvent, false, false, &track));
>+        dispatchEvent(MediaStreamTrackEvent::create(eventNames().addtrackEvent, Event::CanBubble::No, Event::IsCancelable::No, &track));
> 
>     return true;
> }
>@@ -245,7 +245,7 @@ bool MediaStream::internalRemoveTrack(co
>     if (streamModifier == StreamModifier::DomAPI)
>         m_private->removeTrack(track->privateTrack(), MediaStreamPrivate::NotifyClientOption::DontNotify);
>     else
>-        dispatchEvent(MediaStreamTrackEvent::create(eventNames().removetrackEvent, false, false, WTFMove(track)));
>+        dispatchEvent(MediaStreamTrackEvent::create(eventNames().removetrackEvent, Event::CanBubble::No, Event::IsCancelable::No, WTFMove(track)));
> 
>     return true;
> }
>Index: Source/WebCore/Modules/mediastream/MediaStreamEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/mediastream/MediaStreamEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/MediaStreamEvent.cpp	(working copy)
>@@ -31,7 +31,7 @@
> 
> namespace WebCore {
> 
>-Ref<MediaStreamEvent> MediaStreamEvent::create(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<MediaStream>&& stream)
>+Ref<MediaStreamEvent> MediaStreamEvent::create(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, RefPtr<MediaStream>&& stream)
> {
>     return adoptRef(*new MediaStreamEvent(type, canBubble, cancelable, WTFMove(stream)));
> }
>@@ -41,7 +41,7 @@ Ref<MediaStreamEvent> MediaStreamEvent::
>     return adoptRef(*new MediaStreamEvent(type, initializer, isTrusted));
> }
> 
>-MediaStreamEvent::MediaStreamEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<MediaStream>&& stream)
>+MediaStreamEvent::MediaStreamEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, RefPtr<MediaStream>&& stream)
>     : Event(type, canBubble, cancelable)
>     , m_stream(WTFMove(stream))
> {
>Index: Source/WebCore/Modules/mediastream/MediaStreamEvent.h
>===================================================================
>--- Source/WebCore/Modules/mediastream/MediaStreamEvent.h	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/MediaStreamEvent.h	(working copy)
>@@ -36,7 +36,7 @@ class MediaStreamEvent : public Event {
> public:
>     virtual ~MediaStreamEvent();
> 
>-    static Ref<MediaStreamEvent> create(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<MediaStream>&&);
>+    static Ref<MediaStreamEvent> create(const AtomicString& type, CanBubble, IsCancelable, RefPtr<MediaStream>&&);
> 
>     struct Init : EventInit {
>         RefPtr<MediaStream> stream;
>@@ -48,7 +48,7 @@ public:
>     virtual EventInterface eventInterface() const;
> 
> private:
>-    MediaStreamEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<MediaStream>&&);
>+    MediaStreamEvent(const AtomicString& type, CanBubble, IsCancelable, RefPtr<MediaStream>&&);
>     MediaStreamEvent(const AtomicString& type, const Init&, IsTrusted);
> 
>     RefPtr<MediaStream> m_stream;
>Index: Source/WebCore/Modules/mediastream/MediaStreamTrack.cpp
>===================================================================
>--- Source/WebCore/Modules/mediastream/MediaStreamTrack.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/MediaStreamTrack.cpp	(working copy)
>@@ -365,7 +365,7 @@ void MediaStreamTrack::trackEnded(MediaS
> 
>     // 3. Notify track's source that track is ended so that the source may be stopped, unless other MediaStreamTrack objects depend on it.
>     // 4. Fire a simple event named ended at the object.
>-    dispatchEvent(Event::create(eventNames().endedEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().endedEvent, Event::CanBubble::No, Event::IsCancelable::No));
> 
>     for (auto& observer : m_observers)
>         observer->trackDidEnd();
>@@ -379,7 +379,7 @@ void MediaStreamTrack::trackMutedChanged
>         return;
> 
>     AtomicString eventType = muted() ? eventNames().muteEvent : eventNames().unmuteEvent;
>-    dispatchEvent(Event::create(eventType, false, false));
>+    dispatchEvent(Event::create(eventType, Event::CanBubble::No, Event::IsCancelable::No));
> 
>     configureTrackRendering();
> }
>Index: Source/WebCore/Modules/mediastream/MediaStreamTrackEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/mediastream/MediaStreamTrackEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/MediaStreamTrackEvent.cpp	(working copy)
>@@ -31,7 +31,7 @@
> 
> namespace WebCore {
> 
>-Ref<MediaStreamTrackEvent> MediaStreamTrackEvent::create(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<MediaStreamTrack>&& track)
>+Ref<MediaStreamTrackEvent> MediaStreamTrackEvent::create(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, RefPtr<MediaStreamTrack>&& track)
> {
>     return adoptRef(*new MediaStreamTrackEvent(type, canBubble, cancelable, WTFMove(track)));
> }
>@@ -41,7 +41,7 @@ Ref<MediaStreamTrackEvent> MediaStreamTr
>     return adoptRef(*new MediaStreamTrackEvent(type, initializer, isTrusted));
> }
> 
>-MediaStreamTrackEvent::MediaStreamTrackEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<MediaStreamTrack>&& track)
>+MediaStreamTrackEvent::MediaStreamTrackEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, RefPtr<MediaStreamTrack>&& track)
>     : Event(type, canBubble, cancelable)
>     , m_track(WTFMove(track))
> {
>Index: Source/WebCore/Modules/mediastream/MediaStreamTrackEvent.h
>===================================================================
>--- Source/WebCore/Modules/mediastream/MediaStreamTrackEvent.h	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/MediaStreamTrackEvent.h	(working copy)
>@@ -37,7 +37,7 @@ class MediaStreamTrackEvent : public Eve
> public:
>     virtual ~MediaStreamTrackEvent();
> 
>-    static Ref<MediaStreamTrackEvent> create(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<MediaStreamTrack>&&);
>+    static Ref<MediaStreamTrackEvent> create(const AtomicString& type, CanBubble, IsCancelable, RefPtr<MediaStreamTrack>&&);
> 
>     struct Init : EventInit {
>         RefPtr<MediaStreamTrack> track;
>@@ -50,7 +50,7 @@ public:
>     EventInterface eventInterface() const override;
> 
> private:
>-    MediaStreamTrackEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<MediaStreamTrack>&&);
>+    MediaStreamTrackEvent(const AtomicString& type, CanBubble, IsCancelable, RefPtr<MediaStreamTrack>&&);
>     MediaStreamTrackEvent(const AtomicString& type, const Init&, IsTrusted);
> 
>     RefPtr<MediaStreamTrack> m_track;
>Index: Source/WebCore/Modules/mediastream/OverconstrainedErrorEvent.h
>===================================================================
>--- Source/WebCore/Modules/mediastream/OverconstrainedErrorEvent.h	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/OverconstrainedErrorEvent.h	(working copy)
>@@ -40,7 +40,7 @@ class OverconstrainedErrorEvent : public
> public:
>     virtual ~OverconstrainedErrorEvent() = default;
> 
>-    static Ref<OverconstrainedErrorEvent> create(const AtomicString& type, bool canBubble, bool cancelable, OverconstrainedError* error)
>+    static Ref<OverconstrainedErrorEvent> create(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, OverconstrainedError* error)
>     {
>         return adoptRef(*new OverconstrainedErrorEvent(type, canBubble, cancelable, error));
>     }
>@@ -58,7 +58,7 @@ public:
>     EventInterface eventInterface() const override { return OverconstrainedErrorEventInterfaceType; }
> 
> private:
>-    explicit OverconstrainedErrorEvent(const AtomicString& type, bool canBubble, bool cancelable, OverconstrainedError* error)
>+    explicit OverconstrainedErrorEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, OverconstrainedError* error)
>         : Event(type, canBubble, cancelable)
>         , m_error(error)
>     {
>Index: Source/WebCore/Modules/mediastream/PeerConnectionBackend.cpp
>===================================================================
>--- Source/WebCore/Modules/mediastream/PeerConnectionBackend.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/PeerConnectionBackend.cpp	(working copy)
>@@ -356,7 +356,7 @@ void PeerConnectionBackend::fireICECandi
> {
>     ASSERT(isMainThread());
> 
>-    m_peerConnection.fireEvent(RTCPeerConnectionIceEvent::create(false, false, WTFMove(candidate), WTFMove(serverURL)));
>+    m_peerConnection.fireEvent(RTCPeerConnectionIceEvent::create(Event::CanBubble::No, Event::IsCancelable::No, WTFMove(candidate), WTFMove(serverURL)));
> }
> 
> void PeerConnectionBackend::enableICECandidateFiltering()
>@@ -456,7 +456,7 @@ void PeerConnectionBackend::doneGatherin
>     if (m_waitingForMDNSRegistration)
>         return;
> 
>-    m_peerConnection.fireEvent(RTCPeerConnectionIceEvent::create(false, false, nullptr, { }));
>+    m_peerConnection.fireEvent(RTCPeerConnectionIceEvent::create(Event::CanBubble::No, Event::IsCancelable::No, nullptr, { }));
>     m_peerConnection.updateIceGatheringState(RTCIceGatheringState::Complete);
>     m_pendingICECandidates.clear();
> }
>@@ -505,7 +505,7 @@ void PeerConnectionBackend::updateSignal
> 
>     if (newSignalingState != m_peerConnection.signalingState()) {
>         m_peerConnection.setSignalingState(newSignalingState);
>-        m_peerConnection.fireEvent(Event::create(eventNames().signalingstatechangeEvent, false, false));
>+        m_peerConnection.fireEvent(Event::create(eventNames().signalingstatechangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     }
> }
> 
>Index: Source/WebCore/Modules/mediastream/RTCDTMFToneChangeEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/mediastream/RTCDTMFToneChangeEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/RTCDTMFToneChangeEvent.cpp	(working copy)
>@@ -43,7 +43,7 @@ Ref<RTCDTMFToneChangeEvent> RTCDTMFToneC
> }
> 
> RTCDTMFToneChangeEvent::RTCDTMFToneChangeEvent(const String& tone)
>-    : Event(eventNames().tonechangeEvent, false, false)
>+    : Event(eventNames().tonechangeEvent, CanBubble::No, IsCancelable::No)
>     , m_tone(tone)
> {
> }
>Index: Source/WebCore/Modules/mediastream/RTCDataChannel.cpp
>===================================================================
>--- Source/WebCore/Modules/mediastream/RTCDataChannel.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/RTCDataChannel.cpp	(working copy)
>@@ -171,10 +171,10 @@ void RTCDataChannel::didChangeReadyState
> 
>     switch (m_readyState) {
>     case RTCDataChannelState::Open:
>-        scheduleDispatchEvent(Event::create(eventNames().openEvent, false, false));
>+        scheduleDispatchEvent(Event::create(eventNames().openEvent, Event::CanBubble::No, Event::IsCancelable::No));
>         break;
>     case RTCDataChannelState::Closed:
>-        scheduleDispatchEvent(Event::create(eventNames().closeEvent, false, false));
>+        scheduleDispatchEvent(Event::create(eventNames().closeEvent, Event::CanBubble::No, Event::IsCancelable::No));
>         break;
>     default:
>         break;
>@@ -211,7 +211,7 @@ void RTCDataChannel::didDetectError()
>     if (m_stopped)
>         return;
> 
>-    scheduleDispatchEvent(Event::create(eventNames().errorEvent, false, false));
>+    scheduleDispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void RTCDataChannel::bufferedAmountIsDecreasing(size_t amount)
>@@ -220,7 +220,7 @@ void RTCDataChannel::bufferedAmountIsDec
>         return;
> 
>     if (amount <= m_bufferedAmountLowThreshold)
>-        scheduleDispatchEvent(Event::create(eventNames().bufferedamountlowEvent, false, false));
>+        scheduleDispatchEvent(Event::create(eventNames().bufferedamountlowEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void RTCDataChannel::stop()
>Index: Source/WebCore/Modules/mediastream/RTCDataChannelEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/mediastream/RTCDataChannelEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/RTCDataChannelEvent.cpp	(working copy)
>@@ -32,7 +32,7 @@
> 
> namespace WebCore {
> 
>-Ref<RTCDataChannelEvent> RTCDataChannelEvent::create(const AtomicString& type, bool canBubble, bool cancelable, Ref<RTCDataChannel>&& channel)
>+Ref<RTCDataChannelEvent> RTCDataChannelEvent::create(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, Ref<RTCDataChannel>&& channel)
> {
>     return adoptRef(*new RTCDataChannelEvent(type, canBubble, cancelable, WTFMove(channel)));
> }
>@@ -42,7 +42,7 @@ Ref<RTCDataChannelEvent> RTCDataChannelE
>     return adoptRef(*new RTCDataChannelEvent(type, WTFMove(initializer), isTrusted));
> }
> 
>-RTCDataChannelEvent::RTCDataChannelEvent(const AtomicString& type, bool canBubble, bool cancelable, Ref<RTCDataChannel>&& channel)
>+RTCDataChannelEvent::RTCDataChannelEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, Ref<RTCDataChannel>&& channel)
>     : Event(type, canBubble, cancelable)
>     , m_channel(WTFMove(channel))
> {
>Index: Source/WebCore/Modules/mediastream/RTCDataChannelEvent.h
>===================================================================
>--- Source/WebCore/Modules/mediastream/RTCDataChannelEvent.h	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/RTCDataChannelEvent.h	(working copy)
>@@ -39,7 +39,7 @@ public:
>         RefPtr<RTCDataChannel> channel;
>     };
> 
>-    static Ref<RTCDataChannelEvent> create(const AtomicString& type, bool canBubble, bool cancelable, Ref<RTCDataChannel>&&);
>+    static Ref<RTCDataChannelEvent> create(const AtomicString& type, CanBubble, IsCancelable, Ref<RTCDataChannel>&&);
>     static Ref<RTCDataChannelEvent> create(const AtomicString& type, Init&&, IsTrusted = IsTrusted::No);
> 
>     RTCDataChannel& channel();
>@@ -47,7 +47,7 @@ public:
>     virtual EventInterface eventInterface() const;
> 
> private:
>-    RTCDataChannelEvent(const AtomicString& type, bool canBubble, bool cancelable, Ref<RTCDataChannel>&&);
>+    RTCDataChannelEvent(const AtomicString& type, CanBubble, IsCancelable, Ref<RTCDataChannel>&&);
>     RTCDataChannelEvent(const AtomicString& type, Init&&, IsTrusted);
> 
>     Ref<RTCDataChannel> m_channel;
>Index: Source/WebCore/Modules/mediastream/RTCPeerConnection.cpp
>===================================================================
>--- Source/WebCore/Modules/mediastream/RTCPeerConnection.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/RTCPeerConnection.cpp	(working copy)
>@@ -503,7 +503,7 @@ void RTCPeerConnection::updateIceGatheri
>             return;
> 
>         protectedThis->m_iceGatheringState = newState;
>-        protectedThis->dispatchEvent(Event::create(eventNames().icegatheringstatechangeEvent, false, false));
>+        protectedThis->dispatchEvent(Event::create(eventNames().icegatheringstatechangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
>         protectedThis->updateConnectionState();
>     });
> }
>@@ -517,7 +517,7 @@ void RTCPeerConnection::updateIceConnect
>             return;
> 
>         protectedThis->m_iceConnectionState = newState;
>-        protectedThis->dispatchEvent(Event::create(eventNames().iceconnectionstatechangeEvent, false, false));
>+        protectedThis->dispatchEvent(Event::create(eventNames().iceconnectionstatechangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
>         protectedThis->updateConnectionState();
>     });
> }
>@@ -547,7 +547,7 @@ void RTCPeerConnection::updateConnection
>     INFO_LOG(LOGIDENTIFIER, "state changed from: " , m_connectionState, " to ", state);
> 
>     m_connectionState = state;
>-    dispatchEvent(Event::create(eventNames().connectionstatechangeEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().connectionstatechangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void RTCPeerConnection::scheduleNegotiationNeededEvent()
>@@ -558,7 +558,7 @@ void RTCPeerConnection::scheduleNegotiat
>         if (!protectedThis->m_backend->isNegotiationNeeded())
>             return;
>         protectedThis->m_backend->clearNegotiationNeededState();
>-        protectedThis->dispatchEvent(Event::create(eventNames().negotiationneededEvent, false, false));
>+        protectedThis->dispatchEvent(Event::create(eventNames().negotiationneededEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     });
> }
> 
>Index: Source/WebCore/Modules/mediastream/RTCPeerConnectionIceEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/mediastream/RTCPeerConnectionIceEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/RTCPeerConnectionIceEvent.cpp	(working copy)
>@@ -32,17 +32,18 @@
> 
> namespace WebCore {
> 
>-Ref<RTCPeerConnectionIceEvent> RTCPeerConnectionIceEvent::create(bool canBubble, bool cancelable, RefPtr<RTCIceCandidate>&& candidate, String&& serverURL)
>+Ref<RTCPeerConnectionIceEvent> RTCPeerConnectionIceEvent::create(CanBubble canBubble, IsCancelable cancelable, RefPtr<RTCIceCandidate>&& candidate, String&& serverURL)
> {
>     return adoptRef(*new RTCPeerConnectionIceEvent(eventNames().icecandidateEvent, canBubble, cancelable, WTFMove(candidate), WTFMove(serverURL)));
> }
> 
> Ref<RTCPeerConnectionIceEvent> RTCPeerConnectionIceEvent::create(const AtomicString& type, Init&& init)
> {
>-    return adoptRef(*new RTCPeerConnectionIceEvent(type, init.bubbles, init.cancelable, WTFMove(init.candidate), WTFMove(init.url)));
>+    return adoptRef(*new RTCPeerConnectionIceEvent(type, init.bubbles ? CanBubble::Yes : CanBubble::No,
>+        init.cancelable ? IsCancelable::Yes : IsCancelable::No, WTFMove(init.candidate), WTFMove(init.url)));
> }
> 
>-RTCPeerConnectionIceEvent::RTCPeerConnectionIceEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<RTCIceCandidate>&& candidate, String&& serverURL)
>+RTCPeerConnectionIceEvent::RTCPeerConnectionIceEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, RefPtr<RTCIceCandidate>&& candidate, String&& serverURL)
>     : Event(type, canBubble, cancelable)
>     , m_candidate(WTFMove(candidate))
>     , m_url(WTFMove(serverURL))
>Index: Source/WebCore/Modules/mediastream/RTCPeerConnectionIceEvent.h
>===================================================================
>--- Source/WebCore/Modules/mediastream/RTCPeerConnectionIceEvent.h	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/RTCPeerConnectionIceEvent.h	(working copy)
>@@ -42,7 +42,7 @@ public:
>     };
> 
>     static Ref<RTCPeerConnectionIceEvent> create(const AtomicString& type, Init&&);
>-    static Ref<RTCPeerConnectionIceEvent> create(bool canBubble, bool cancelable, RefPtr<RTCIceCandidate>&&, String&& serverURL);
>+    static Ref<RTCPeerConnectionIceEvent> create(CanBubble, IsCancelable, RefPtr<RTCIceCandidate>&&, String&& serverURL);
> 
>     RTCIceCandidate* candidate() const;
>     const String& url() const { return m_url; }
>@@ -50,7 +50,7 @@ public:
>     virtual EventInterface eventInterface() const;
> 
> private:
>-    RTCPeerConnectionIceEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<RTCIceCandidate>&&, String&& serverURL);
>+    RTCPeerConnectionIceEvent(const AtomicString& type, CanBubble, IsCancelable, RefPtr<RTCIceCandidate>&&, String&& serverURL);
> 
>     RefPtr<RTCIceCandidate> m_candidate;
>     String m_url;
>Index: Source/WebCore/Modules/mediastream/RTCTrackEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/mediastream/RTCTrackEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/RTCTrackEvent.cpp	(working copy)
>@@ -39,7 +39,7 @@
> 
> namespace WebCore {
> 
>-Ref<RTCTrackEvent> RTCTrackEvent::create(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<RTCRtpReceiver>&& receiver, RefPtr<MediaStreamTrack>&& track, Vector<RefPtr<MediaStream>>&& streams, RefPtr<RTCRtpTransceiver>&& transceiver)
>+Ref<RTCTrackEvent> RTCTrackEvent::create(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, RefPtr<RTCRtpReceiver>&& receiver, RefPtr<MediaStreamTrack>&& track, Vector<RefPtr<MediaStream>>&& streams, RefPtr<RTCRtpTransceiver>&& transceiver)
> {
>     return adoptRef(*new RTCTrackEvent(type, canBubble, cancelable, WTFMove(receiver), WTFMove(track), WTFMove(streams), WTFMove(transceiver)));
> }
>@@ -49,7 +49,7 @@ Ref<RTCTrackEvent> RTCTrackEvent::create
>     return adoptRef(*new RTCTrackEvent(type, initializer, isTrusted));
> }
> 
>-RTCTrackEvent::RTCTrackEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<RTCRtpReceiver>&& receiver, RefPtr<MediaStreamTrack>&& track, Vector<RefPtr<MediaStream>>&& streams, RefPtr<RTCRtpTransceiver>&& transceiver)
>+RTCTrackEvent::RTCTrackEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, RefPtr<RTCRtpReceiver>&& receiver, RefPtr<MediaStreamTrack>&& track, Vector<RefPtr<MediaStream>>&& streams, RefPtr<RTCRtpTransceiver>&& transceiver)
>     : Event(type, canBubble, cancelable)
>     , m_receiver(WTFMove(receiver))
>     , m_track(WTFMove(track))
>Index: Source/WebCore/Modules/mediastream/RTCTrackEvent.h
>===================================================================
>--- Source/WebCore/Modules/mediastream/RTCTrackEvent.h	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/RTCTrackEvent.h	(working copy)
>@@ -46,7 +46,7 @@ typedef Vector<RefPtr<MediaStream>> Medi
> 
> class RTCTrackEvent : public Event {
> public:
>-    static Ref<RTCTrackEvent> create(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<RTCRtpReceiver>&&, RefPtr<MediaStreamTrack>&&, MediaStreamArray&&, RefPtr<RTCRtpTransceiver>&&);
>+    static Ref<RTCTrackEvent> create(const AtomicString& type, CanBubble, IsCancelable, RefPtr<RTCRtpReceiver>&&, RefPtr<MediaStreamTrack>&&, MediaStreamArray&&, RefPtr<RTCRtpTransceiver>&&);
> 
>     struct Init : EventInit {
>         RefPtr<RTCRtpReceiver> receiver;
>@@ -64,7 +64,7 @@ public:
>     virtual EventInterface eventInterface() const { return RTCTrackEventInterfaceType; }
> 
> private:
>-    RTCTrackEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<RTCRtpReceiver>&&, RefPtr<MediaStreamTrack>&&, MediaStreamArray&&, RefPtr<RTCRtpTransceiver>&&);
>+    RTCTrackEvent(const AtomicString& type, CanBubble, IsCancelable, RefPtr<RTCRtpReceiver>&&, RefPtr<MediaStreamTrack>&&, MediaStreamArray&&, RefPtr<RTCRtpTransceiver>&&);
>     RTCTrackEvent(const AtomicString& type, const Init&, IsTrusted);
> 
>     RefPtr<RTCRtpReceiver> m_receiver;
>Index: Source/WebCore/Modules/mediastream/libwebrtc/LibWebRTCMediaEndpoint.cpp
>===================================================================
>--- Source/WebCore/Modules/mediastream/libwebrtc/LibWebRTCMediaEndpoint.cpp	(revision 234910)
>+++ Source/WebCore/Modules/mediastream/libwebrtc/LibWebRTCMediaEndpoint.cpp	(working copy)
>@@ -634,7 +634,8 @@ void LibWebRTCMediaEndpoint::addRemoteSt
>         return;
> 
>     auto& mediaStream = mediaStreamFromRTCStream(rtcStream);
>-    m_peerConnectionBackend.connection().fireEvent(MediaStreamEvent::create(eventNames().addstreamEvent, false, false, &mediaStream));
>+    m_peerConnectionBackend.connection().fireEvent(MediaStreamEvent::create(eventNames().addstreamEvent,
>+        Event::CanBubble::No, Event::IsCancelable::No, &mediaStream));
> }
> 
> class RTCRtpReceiverBackend final : public RTCRtpReceiver::Backend {
>@@ -687,7 +688,8 @@ void LibWebRTCMediaEndpoint::addRemoteTr
>         streams.append(&mediaStream);
>         mediaStream.addTrackFromPlatform(*track);
>     }
>-    m_peerConnectionBackend.connection().fireEvent(RTCTrackEvent::create(eventNames().trackEvent, false, false, WTFMove(receiver), track, WTFMove(streams), nullptr));
>+    m_peerConnectionBackend.connection().fireEvent(RTCTrackEvent::create(eventNames().trackEvent,
>+        Event::CanBubble::No, Event::IsCancelable::No, WTFMove(receiver), track, WTFMove(streams), nullptr));
> }
> 
> void LibWebRTCMediaEndpoint::removeRemoteStream(webrtc::MediaStreamInterface& rtcStream)
>@@ -777,7 +779,8 @@ void LibWebRTCMediaEndpoint::addDataChan
>         });
>     }
> 
>-    m_peerConnectionBackend.connection().fireEvent(RTCDataChannelEvent::create(eventNames().datachannelEvent, false, false, WTFMove(channel)));
>+    m_peerConnectionBackend.connection().fireEvent(RTCDataChannelEvent::create(eventNames().datachannelEvent,
>+        Event::CanBubble::No, Event::IsCancelable::No, WTFMove(channel)));
> }
> 
> void LibWebRTCMediaEndpoint::OnDataChannel(rtc::scoped_refptr<webrtc::DataChannelInterface> dataChannel)
>Index: Source/WebCore/Modules/notifications/Notification.cpp
>===================================================================
>--- Source/WebCore/Modules/notifications/Notification.cpp	(revision 234910)
>+++ Source/WebCore/Modules/notifications/Notification.cpp	(working copy)
>@@ -141,24 +141,24 @@ void Notification::finalize()
> 
> void Notification::dispatchShowEvent()
> {
>-    dispatchEvent(Event::create(eventNames().showEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().showEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void Notification::dispatchClickEvent()
> {
>     WindowFocusAllowedIndicator windowFocusAllowed;
>-    dispatchEvent(Event::create(eventNames().clickEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().clickEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void Notification::dispatchCloseEvent()
> {
>-    dispatchEvent(Event::create(eventNames().closeEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().closeEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     finalize();
> }
> 
> void Notification::dispatchErrorEvent()
> {
>-    dispatchEvent(Event::create(eventNames().errorEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> auto Notification::permission(Document& document) -> Permission
>Index: Source/WebCore/Modules/paymentrequest/MerchantValidationEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/paymentrequest/MerchantValidationEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/paymentrequest/MerchantValidationEvent.cpp	(working copy)
>@@ -38,7 +38,7 @@ Ref<MerchantValidationEvent> MerchantVal
> }
> 
> MerchantValidationEvent::MerchantValidationEvent(const AtomicString& type, const URL& validationURL, PaymentRequest& paymentRequest)
>-    : Event { type, false, false }
>+    : Event { type, Event::CanBubble::No, Event::IsCancelable::No }
>     , m_validationURL { validationURL }
>     , m_paymentRequest { paymentRequest }
> {
>Index: Source/WebCore/Modules/paymentrequest/PaymentRequestUpdateEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/paymentrequest/PaymentRequestUpdateEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/paymentrequest/PaymentRequestUpdateEvent.cpp	(working copy)
>@@ -38,7 +38,7 @@ PaymentRequestUpdateEvent::PaymentReques
> }
> 
> PaymentRequestUpdateEvent::PaymentRequestUpdateEvent(const AtomicString& type, PaymentRequest& paymentRequest)
>-    : Event { type, false, false }
>+    : Event { type, CanBubble::No, IsCancelable::No }
>     , m_paymentRequest { &paymentRequest }
> {
> }
>Index: Source/WebCore/Modules/plugins/QuickTimePluginReplacement.mm
>===================================================================
>--- Source/WebCore/Modules/plugins/QuickTimePluginReplacement.mm	(revision 234910)
>+++ Source/WebCore/Modules/plugins/QuickTimePluginReplacement.mm	(working copy)
>@@ -250,7 +250,7 @@ unsigned long long QuickTimePluginReplac
> void QuickTimePluginReplacement::postEvent(const String& eventName)
> {
>     Ref<HTMLPlugInElement> protect(*m_parentElement);
>-    Ref<Event> event = Event::create(eventName, false, true);
>+    Ref<Event> event = Event::create(eventName, Event::CanBubble::No, Event::IsCancelable::Yes);
>     m_parentElement->dispatchEvent(event);
> }
> 
>Index: Source/WebCore/Modules/speech/SpeechSynthesisEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/speech/SpeechSynthesisEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/speech/SpeechSynthesisEvent.cpp	(working copy)
>@@ -36,7 +36,7 @@ Ref<SpeechSynthesisEvent> SpeechSynthesi
> }
> 
> SpeechSynthesisEvent::SpeechSynthesisEvent(const AtomicString& type, unsigned charIndex, float elapsedTime, const String& name)
>-    : Event(type, false, false)
>+    : Event(type, CanBubble::No, IsCancelable::No)
>     , m_charIndex(charIndex)
>     , m_elapsedTime(elapsedTime)
>     , m_name(name)
>Index: Source/WebCore/Modules/webaudio/AudioContext.cpp
>===================================================================
>--- Source/WebCore/Modules/webaudio/AudioContext.cpp	(revision 234910)
>+++ Source/WebCore/Modules/webaudio/AudioContext.cpp	(working copy)
>@@ -288,7 +288,7 @@ void AudioContext::setState(State state)
>         return;
> 
>     m_state = state;
>-    m_eventQueue->enqueueEvent(Event::create(eventNames().statechangeEvent, true, false));
>+    m_eventQueue->enqueueEvent(Event::create(eventNames().statechangeEvent, Event::CanBubble::Yes, Event::IsCancelable::No));
> 
>     size_t stateIndex = static_cast<size_t>(state);
>     if (stateIndex >= m_stateReactions.size())
>Index: Source/WebCore/Modules/webaudio/AudioProcessingEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/webaudio/AudioProcessingEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/webaudio/AudioProcessingEvent.cpp	(working copy)
>@@ -36,7 +36,7 @@ namespace WebCore {
> AudioProcessingEvent::AudioProcessingEvent() = default;
> 
> AudioProcessingEvent::AudioProcessingEvent(RefPtr<AudioBuffer>&& inputBuffer, RefPtr<AudioBuffer>&& outputBuffer, double playbackTime)
>-    : Event(eventNames().audioprocessEvent, true, false)
>+    : Event(eventNames().audioprocessEvent, CanBubble::Yes, IsCancelable::No)
>     , m_inputBuffer(WTFMove(inputBuffer))
>     , m_outputBuffer(WTFMove(outputBuffer))
>     , m_playbackTime(playbackTime)
>Index: Source/WebCore/Modules/webaudio/AudioScheduledSourceNode.cpp
>===================================================================
>--- Source/WebCore/Modules/webaudio/AudioScheduledSourceNode.cpp	(revision 234910)
>+++ Source/WebCore/Modules/webaudio/AudioScheduledSourceNode.cpp	(working copy)
>@@ -179,7 +179,7 @@ void AudioScheduledSourceNode::finish()
>         if (!this->scriptExecutionContext())
>             return;
> 
>-        this->dispatchEvent(Event::create(eventNames().endedEvent, false, false));
>+        this->dispatchEvent(Event::create(eventNames().endedEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     });
> }
> 
>Index: Source/WebCore/Modules/webaudio/OfflineAudioCompletionEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/webaudio/OfflineAudioCompletionEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/webaudio/OfflineAudioCompletionEvent.cpp	(working copy)
>@@ -39,7 +39,7 @@ Ref<OfflineAudioCompletionEvent> Offline
> }
> 
> OfflineAudioCompletionEvent::OfflineAudioCompletionEvent(RefPtr<AudioBuffer>&& renderedBuffer)
>-    : Event(eventNames().completeEvent, true, false)
>+    : Event(eventNames().completeEvent, CanBubble::Yes, IsCancelable::No)
>     , m_renderedBuffer(WTFMove(renderedBuffer))
> {
> }
>Index: Source/WebCore/Modules/websockets/CloseEvent.h
>===================================================================
>--- Source/WebCore/Modules/websockets/CloseEvent.h	(revision 234910)
>+++ Source/WebCore/Modules/websockets/CloseEvent.h	(working copy)
>@@ -62,7 +62,7 @@ public:
> 
> private:
>     CloseEvent(bool wasClean, int code, const String& reason)
>-        : Event(eventNames().closeEvent, false, false)
>+        : Event(eventNames().closeEvent, CanBubble::No, IsCancelable::No)
>         , m_wasClean(wasClean)
>         , m_code(code)
>         , m_reason(reason)
>Index: Source/WebCore/Modules/websockets/WebSocket.cpp
>===================================================================
>--- Source/WebCore/Modules/websockets/WebSocket.cpp	(revision 234910)
>+++ Source/WebCore/Modules/websockets/WebSocket.cpp	(working copy)
>@@ -563,7 +563,7 @@ void WebSocket::didConnect()
>     m_state = OPEN;
>     m_subprotocol = m_channel->subprotocol();
>     m_extensions = m_channel->extensions();
>-    dispatchEvent(Event::create(eventNames().openEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().openEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void WebSocket::didReceiveMessage(const String& msg)
>@@ -657,7 +657,7 @@ void WebSocket::dispatchOrQueueErrorEven
>         return;
> 
>     m_dispatchedErrorEvent = true;
>-    dispatchOrQueueEvent(Event::create(eventNames().errorEvent, false, false));
>+    dispatchOrQueueEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void WebSocket::dispatchOrQueueEvent(Ref<Event>&& event)
>Index: Source/WebCore/Modules/webvr/VRDisplayEvent.cpp
>===================================================================
>--- Source/WebCore/Modules/webvr/VRDisplayEvent.cpp	(revision 234910)
>+++ Source/WebCore/Modules/webvr/VRDisplayEvent.cpp	(working copy)
>@@ -37,7 +37,7 @@ VRDisplayEvent::VRDisplayEvent(const Ato
> }
> 
> VRDisplayEvent::VRDisplayEvent(const AtomicString& name, const RefPtr<VRDisplay>& display, std::optional<VRDisplayEventReason>&& reason)
>-    : Event(name, false /*canBubble*/, false /*cancelable*/)
>+    : Event(name, CanBubble::No, IsCancelable::No)
>     , m_display(display)
>     , m_reason(WTFMove(reason))
> {
>Index: Source/WebCore/accessibility/AccessibilityObject.cpp
>===================================================================
>--- Source/WebCore/accessibility/AccessibilityObject.cpp	(revision 234910)
>+++ Source/WebCore/accessibility/AccessibilityObject.cpp	(working copy)
>@@ -2216,7 +2216,7 @@ bool AccessibilityObject::dispatchAccess
>         return false;
>     }
>     
>-    auto event = Event::create(eventName, true, true);
>+    auto event = Event::create(eventName, Event::CanBubble::Yes, Event::IsCancelable::Yes);
>     return dispatchAccessibilityEvent(event);
> }
> 
>Index: Source/WebCore/accessibility/AccessibleSetValueEvent.cpp
>===================================================================
>--- Source/WebCore/accessibility/AccessibleSetValueEvent.cpp	(revision 234910)
>+++ Source/WebCore/accessibility/AccessibleSetValueEvent.cpp	(working copy)
>@@ -29,7 +29,7 @@
> namespace WebCore {
> 
> AccessibleSetValueEvent::AccessibleSetValueEvent(const AtomicString& type, const AtomicString& value)
>-    : Event(type, true, true)
>+    : Event(type, CanBubble::Yes, IsCancelable::Yes)
>     , m_value(value)
> {
> }
>Index: Source/WebCore/animation/AnimationPlaybackEvent.cpp
>===================================================================
>--- Source/WebCore/animation/AnimationPlaybackEvent.cpp	(revision 234910)
>+++ Source/WebCore/animation/AnimationPlaybackEvent.cpp	(working copy)
>@@ -45,7 +45,7 @@ AnimationPlaybackEvent::AnimationPlaybac
> }
> 
> AnimationPlaybackEvent::AnimationPlaybackEvent(const AtomicString& type, std::optional<Seconds> currentTime, std::optional<Seconds> timelineTime)
>-    : Event(type, true, false)
>+    : Event(type, CanBubble::Yes, IsCancelable::No)
>     , m_currentTime(currentTime)
>     , m_timelineTime(timelineTime)
> {
>Index: Source/WebCore/dom/AbortSignal.cpp
>===================================================================
>--- Source/WebCore/dom/AbortSignal.cpp	(revision 234910)
>+++ Source/WebCore/dom/AbortSignal.cpp	(working copy)
>@@ -58,7 +58,7 @@ void AbortSignal::abort()
>     // FIXME: Add support for 'abort algorithms' - https://dom.spec.whatwg.org/#abortsignal-abort-algorithms
> 
>     // 5. Fire an event named abort at signal.
>-    dispatchEvent(Event::create(eventNames().abortEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().abortEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> }
>Index: Source/WebCore/dom/AnimationEvent.cpp
>===================================================================
>--- Source/WebCore/dom/AnimationEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/AnimationEvent.cpp	(working copy)
>@@ -36,7 +36,7 @@ AnimationEvent::AnimationEvent(const Ato
> }
> 
> AnimationEvent::AnimationEvent(const AtomicString& type, const String& animationName, double elapsedTime)
>-    : Event(type, true, false)
>+    : Event(type, CanBubble::Yes, IsCancelable::No)
>     , m_animationName(animationName)
>     , m_elapsedTime(elapsedTime)
> {
>Index: Source/WebCore/dom/BeforeLoadEvent.h
>===================================================================
>--- Source/WebCore/dom/BeforeLoadEvent.h	(revision 234910)
>+++ Source/WebCore/dom/BeforeLoadEvent.h	(working copy)
>@@ -53,7 +53,7 @@ public:
> 
> private:
>     explicit BeforeLoadEvent(const String& url)
>-        : Event(eventNames().beforeloadEvent, false, true)
>+        : Event(eventNames().beforeloadEvent, CanBubble::No, IsCancelable::Yes)
>         , m_url(url)
>     {
>     }
>Index: Source/WebCore/dom/BeforeTextInsertedEvent.cpp
>===================================================================
>--- Source/WebCore/dom/BeforeTextInsertedEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/BeforeTextInsertedEvent.cpp	(working copy)
>@@ -31,7 +31,7 @@
> namespace WebCore {
> 
> BeforeTextInsertedEvent::BeforeTextInsertedEvent(const String& text)
>-    : Event(eventNames().webkitBeforeTextInsertedEvent, false, true), m_text(text)
>+    : Event(eventNames().webkitBeforeTextInsertedEvent, CanBubble::No, IsCancelable::Yes), m_text(text)
> {
> }
> 
>Index: Source/WebCore/dom/BeforeUnloadEvent.cpp
>===================================================================
>--- Source/WebCore/dom/BeforeUnloadEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/BeforeUnloadEvent.cpp	(working copy)
>@@ -28,7 +28,7 @@
> namespace WebCore {
> 
> BeforeUnloadEvent::BeforeUnloadEvent()
>-    : Event(eventNames().beforeunloadEvent, false, true)
>+    : Event(eventNames().beforeunloadEvent, CanBubble::No, IsCancelable::Yes)
> {
> }
> 
>Index: Source/WebCore/dom/CharacterData.cpp
>===================================================================
>--- Source/WebCore/dom/CharacterData.cpp	(revision 234910)
>+++ Source/WebCore/dom/CharacterData.cpp	(working copy)
>@@ -227,7 +227,7 @@ void CharacterData::dispatchModifiedEven
> 
>     if (!isInShadowTree()) {
>         if (document().hasListenerType(Document::DOMCHARACTERDATAMODIFIED_LISTENER))
>-            dispatchScopedEvent(MutationEvent::create(eventNames().DOMCharacterDataModifiedEvent, true, nullptr, oldData, m_data));
>+            dispatchScopedEvent(MutationEvent::create(eventNames().DOMCharacterDataModifiedEvent, Event::CanBubble::Yes, nullptr, oldData, m_data));
>         dispatchSubtreeModifiedEvent();
>     }
> 
>Index: Source/WebCore/dom/CompositionEvent.cpp
>===================================================================
>--- Source/WebCore/dom/CompositionEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/CompositionEvent.cpp	(working copy)
>@@ -32,7 +32,7 @@ namespace WebCore {
> CompositionEvent::CompositionEvent() = default;
> 
> CompositionEvent::CompositionEvent(const AtomicString& type, RefPtr<WindowProxy>&& view, const String& data)
>-    : UIEvent(type, true, true, WTFMove(view), 0)
>+    : UIEvent(type, CanBubble::Yes, IsCancelable::Yes, WTFMove(view), 0)
>     , m_data(data)
> {
> }
>Index: Source/WebCore/dom/ContainerNode.cpp
>===================================================================
>--- Source/WebCore/dom/ContainerNode.cpp	(revision 234910)
>+++ Source/WebCore/dom/ContainerNode.cpp	(working copy)
>@@ -775,12 +775,12 @@ static void dispatchChildInsertionEvents
>     Ref<Document> document(child.document());
> 
>     if (c->parentNode() && document->hasListenerType(Document::DOMNODEINSERTED_LISTENER))
>-        c->dispatchScopedEvent(MutationEvent::create(eventNames().DOMNodeInsertedEvent, true, c->parentNode()));
>+        c->dispatchScopedEvent(MutationEvent::create(eventNames().DOMNodeInsertedEvent, Event::CanBubble::Yes, c->parentNode()));
> 
>     // dispatch the DOMNodeInsertedIntoDocument event to all descendants
>     if (c->isConnected() && document->hasListenerType(Document::DOMNODEINSERTEDINTODOCUMENT_LISTENER)) {
>         for (; c; c = NodeTraversal::next(*c, &child))
>-            c->dispatchScopedEvent(MutationEvent::create(eventNames().DOMNodeInsertedIntoDocumentEvent, false));
>+            c->dispatchScopedEvent(MutationEvent::create(eventNames().DOMNodeInsertedIntoDocumentEvent, Event::CanBubble::No));
>     }
> }
> 
>@@ -800,12 +800,12 @@ static void dispatchChildRemovalEvents(R
> 
>     // dispatch pre-removal mutation events
>     if (child->parentNode() && document->hasListenerType(Document::DOMNODEREMOVED_LISTENER))
>-        child->dispatchScopedEvent(MutationEvent::create(eventNames().DOMNodeRemovedEvent, true, child->parentNode()));
>+        child->dispatchScopedEvent(MutationEvent::create(eventNames().DOMNodeRemovedEvent, Event::CanBubble::Yes, child->parentNode()));
> 
>     // dispatch the DOMNodeRemovedFromDocument event to all descendants
>     if (child->isConnected() && document->hasListenerType(Document::DOMNODEREMOVEDFROMDOCUMENT_LISTENER)) {
>         for (RefPtr<Node> currentNode = child.copyRef(); currentNode; currentNode = NodeTraversal::next(*currentNode, child.ptr()))
>-            currentNode->dispatchScopedEvent(MutationEvent::create(eventNames().DOMNodeRemovedFromDocumentEvent, false));
>+            currentNode->dispatchScopedEvent(MutationEvent::create(eventNames().DOMNodeRemovedFromDocumentEvent, Event::CanBubble::No));
>     }
> }
> 
>Index: Source/WebCore/dom/DeviceMotionEvent.cpp
>===================================================================
>--- Source/WebCore/dom/DeviceMotionEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/DeviceMotionEvent.cpp	(working copy)
>@@ -38,7 +38,7 @@ DeviceMotionEvent::DeviceMotionEvent()
> }
> 
> DeviceMotionEvent::DeviceMotionEvent(const AtomicString& eventType, DeviceMotionData* deviceMotionData)
>-    : Event(eventType, false, false) // Can't bubble, not cancelable
>+    : Event(eventType, CanBubble::No, IsCancelable::No)
>     , m_deviceMotionData(deviceMotionData)
> {
> }
>Index: Source/WebCore/dom/DeviceOrientationEvent.cpp
>===================================================================
>--- Source/WebCore/dom/DeviceOrientationEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/DeviceOrientationEvent.cpp	(working copy)
>@@ -38,7 +38,7 @@ DeviceOrientationEvent::DeviceOrientatio
> }
> 
> DeviceOrientationEvent::DeviceOrientationEvent(const AtomicString& eventType, DeviceOrientationData* orientation)
>-    : Event(eventType, false, false) // Can't bubble, not cancelable
>+    : Event(eventType, CanBubble::No, IsCancelable::No)
>     , m_orientation(orientation)
> {
> }
>Index: Source/WebCore/dom/Document.cpp
>===================================================================
>--- Source/WebCore/dom/Document.cpp	(revision 234910)
>+++ Source/WebCore/dom/Document.cpp	(working copy)
>@@ -1216,7 +1216,7 @@ void Document::setReadyState(ReadyState 
>     }
> 
>     m_readyState = readyState;
>-    dispatchEvent(Event::create(eventNames().readystatechangeEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().readystatechangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
> 
>     if (settings().suppressesIncrementalRendering())
>         setVisualUpdatesAllowed(readyState);
>@@ -1630,7 +1630,7 @@ void Document::unregisterForVisibilitySt
> 
> void Document::visibilityStateChanged()
> {
>-    enqueueDocumentEvent(Event::create(eventNames().visibilitychangeEvent, false, false));
>+    enqueueDocumentEvent(Event::create(eventNames().visibilitychangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     for (auto* client : m_visibilityStateCallbackClients)
>         client->visibilityStateChanged();
> 
>@@ -5427,7 +5427,7 @@ void Document::finishedParsing()
>     if (!m_documentTiming.domContentLoadedEventStart)
>         m_documentTiming.domContentLoadedEventStart = MonotonicTime::now();
> 
>-    dispatchEvent(Event::create(eventNames().DOMContentLoadedEvent, true, false));
>+    dispatchEvent(Event::create(eventNames().DOMContentLoadedEvent, Event::CanBubble::Yes, Event::IsCancelable::No));
> 
>     if (!m_documentTiming.domContentLoadedEventEnd)
>         m_documentTiming.domContentLoadedEventEnd = MonotonicTime::now();
>@@ -6401,7 +6401,7 @@ void Document::dispatchFullScreenChangeO
>         if (shouldNotifyMediaElement && is<HTMLMediaElement>(*node))
>             downcast<HTMLMediaElement>(*node).enteredOrExitedFullscreen();
> #endif
>-        node->dispatchEvent(Event::create(eventName, true, false));
>+        node->dispatchEvent(Event::create(eventName, Event::CanBubble::Yes, Event::IsCancelable::No));
>     }
> }
> 
>@@ -7449,7 +7449,7 @@ void Document::didRemoveInDocumentShadow
> void Document::orientationChanged(int orientation)
> {
>     LOG(Events, "Document %p orientationChanged - orientation %d", this, orientation);
>-    dispatchWindowEvent(Event::create(eventNames().orientationchangeEvent, false, false));
>+    dispatchWindowEvent(Event::create(eventNames().orientationchangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     m_orientationNotifier.orientationChanged(orientation);
> }
> 
>Index: Source/WebCore/dom/DocumentEventQueue.cpp
>===================================================================
>--- Source/WebCore/dom/DocumentEventQueue.cpp	(revision 234910)
>+++ Source/WebCore/dom/DocumentEventQueue.cpp	(working copy)
>@@ -86,12 +86,10 @@ void DocumentEventQueue::enqueueOrDispat
>     ASSERT(&target.document() == &m_document);
> 
>     // Per the W3C CSSOM View Module, scroll events fired at the document should bubble, others should not.
>-    bool bubbles = target.isDocumentNode();
>-    bool cancelable = false;
>-    enqueueScrollEvent(target, bubbles, cancelable);
>+    enqueueScrollEvent(target, target.isDocumentNode() ? Event::CanBubble::Yes : Event::CanBubble::No, Event::IsCancelable::No);
> }
> 
>-void DocumentEventQueue::enqueueScrollEvent(EventTarget& target, bool bubbles, bool cancelable)
>+void DocumentEventQueue::enqueueScrollEvent(EventTarget& target, Event::CanBubble canBubble, Event::IsCancelable cancelable)
> {
>     if (m_isClosed)
>         return;
>@@ -102,12 +100,12 @@ void DocumentEventQueue::enqueueScrollEv
>     if (!m_targetsWithQueuedScrollEvents.add(&target).isNewEntry)
>         return;
> 
>-    Ref<Event> scrollEvent = Event::create(eventNames().scrollEvent, bubbles, cancelable);
>+    Ref<Event> scrollEvent = Event::create(eventNames().scrollEvent, canBubble, cancelable);
>     scrollEvent->setTarget(&target);
>     enqueueEvent(WTFMove(scrollEvent));
> }
> 
>-void DocumentEventQueue::enqueueResizeEvent(EventTarget& target, bool bubbles, bool cancelable)
>+void DocumentEventQueue::enqueueResizeEvent(EventTarget& target, Event::CanBubble canBubble, Event::IsCancelable cancelable)
> {
>     if (m_isClosed)
>         return;
>@@ -118,7 +116,7 @@ void DocumentEventQueue::enqueueResizeEv
>     if (!m_targetsWithQueuedResizeEvents.add(&target).isNewEntry)
>         return;
> 
>-    Ref<Event> resizeEvent = Event::create(eventNames().resizeEvent, bubbles, cancelable);
>+    Ref<Event> resizeEvent = Event::create(eventNames().resizeEvent, canBubble, cancelable);
>     resizeEvent->setTarget(&target);
>     enqueueEvent(WTFMove(resizeEvent));
> }
>Index: Source/WebCore/dom/DocumentEventQueue.h
>===================================================================
>--- Source/WebCore/dom/DocumentEventQueue.h	(revision 234910)
>+++ Source/WebCore/dom/DocumentEventQueue.h	(working copy)
>@@ -27,6 +27,7 @@
> 
> #pragma once
> 
>+#include "Event.h"
> #include "EventQueue.h"
> #include <memory>
> #include <wtf/HashSet.h>
>@@ -35,7 +36,6 @@
> namespace WebCore {
> 
> class Document;
>-class Event;
> class Node;
> 
> class DocumentEventQueue final : public EventQueue {
>@@ -48,8 +48,8 @@ public:
>     void close() override;
> 
>     void enqueueOrDispatchScrollEvent(Node&);
>-    void enqueueScrollEvent(EventTarget&, bool bubbles, bool cancelable);
>-    void enqueueResizeEvent(EventTarget&, bool bubbles, bool cancelable);
>+    void enqueueScrollEvent(EventTarget&, Event::CanBubble, Event::IsCancelable);
>+    void enqueueResizeEvent(EventTarget&, Event::CanBubble, Event::IsCancelable);
> 
> private:
>     void pendingEventTimerFired();
>Index: Source/WebCore/dom/Element.cpp
>===================================================================
>--- Source/WebCore/dom/Element.cpp	(revision 234910)
>+++ Source/WebCore/dom/Element.cpp	(working copy)
>@@ -291,7 +291,8 @@ bool Element::dispatchMouseEvent(const P
>         // of the DOM specs, but is used for compatibility with the ondblclick="" attribute. This is treated
>         // as a separate event in other DOM-compliant browsers like Firefox, and so we do the same.
>         Ref<MouseEvent> doubleClickEvent = MouseEvent::create(eventNames().dblclickEvent,
>-            mouseEvent->bubbles(), mouseEvent->cancelable(), mouseEvent->view(), mouseEvent->detail(),
>+            mouseEvent->bubbles() ? Event::CanBubble::Yes : Event::CanBubble::No, mouseEvent->cancelable() ? Event::IsCancelable::Yes : Event::IsCancelable::No,
>+            mouseEvent->view(), mouseEvent->detail(),
>             mouseEvent->screenX(), mouseEvent->screenY(), mouseEvent->clientX(), mouseEvent->clientY(),
>             mouseEvent->ctrlKey(), mouseEvent->altKey(), mouseEvent->shiftKey(), mouseEvent->metaKey(),
>             mouseEvent->button(), mouseEvent->buttons(), mouseEvent->syntheticClickType(), relatedTarget);
>@@ -2579,34 +2580,34 @@ void Element::dispatchFocusInEvent(const
> {
>     ASSERT_WITH_SECURITY_IMPLICATION(ScriptDisallowedScope::InMainThread::isScriptAllowed());
>     ASSERT(eventType == eventNames().focusinEvent || eventType == eventNames().DOMFocusInEvent);
>-    dispatchScopedEvent(FocusEvent::create(eventType, true, false, document().windowProxy(), 0, WTFMove(oldFocusedElement)));
>+    dispatchScopedEvent(FocusEvent::create(eventType, Event::CanBubble::Yes, Event::IsCancelable::No, document().windowProxy(), 0, WTFMove(oldFocusedElement)));
> }
> 
> void Element::dispatchFocusOutEvent(const AtomicString& eventType, RefPtr<Element>&& newFocusedElement)
> {
>     ASSERT_WITH_SECURITY_IMPLICATION(ScriptDisallowedScope::InMainThread::isScriptAllowed());
>     ASSERT(eventType == eventNames().focusoutEvent || eventType == eventNames().DOMFocusOutEvent);
>-    dispatchScopedEvent(FocusEvent::create(eventType, true, false, document().windowProxy(), 0, WTFMove(newFocusedElement)));
>+    dispatchScopedEvent(FocusEvent::create(eventType, Event::CanBubble::Yes, Event::IsCancelable::No, document().windowProxy(), 0, WTFMove(newFocusedElement)));
> }
> 
> void Element::dispatchFocusEvent(RefPtr<Element>&& oldFocusedElement, FocusDirection)
> {
>     if (auto* page = document().page())
>         page->chrome().client().elementDidFocus(*this);
>-    dispatchEvent(FocusEvent::create(eventNames().focusEvent, false, false, document().windowProxy(), 0, WTFMove(oldFocusedElement)));
>+    dispatchEvent(FocusEvent::create(eventNames().focusEvent, Event::CanBubble::No, Event::IsCancelable::No, document().windowProxy(), 0, WTFMove(oldFocusedElement)));
> }
> 
> void Element::dispatchBlurEvent(RefPtr<Element>&& newFocusedElement)
> {
>     if (auto* page = document().page())
>         page->chrome().client().elementDidBlur(*this);
>-    dispatchEvent(FocusEvent::create(eventNames().blurEvent, false, false, document().windowProxy(), 0, WTFMove(newFocusedElement)));
>+    dispatchEvent(FocusEvent::create(eventNames().blurEvent, Event::CanBubble::No, Event::IsCancelable::No, document().windowProxy(), 0, WTFMove(newFocusedElement)));
> }
> 
> void Element::dispatchWebKitImageReadyEventForTesting()
> {
>     if (document().settings().webkitImageReadyEventEnabled())
>-        dispatchEvent(Event::create("webkitImageFrameReady", true, true));
>+        dispatchEvent(Event::create("webkitImageFrameReady", Event::CanBubble::Yes, Event::IsCancelable::Yes));
> }
> 
> bool Element::dispatchMouseForceWillBegin()
>Index: Source/WebCore/dom/ErrorEvent.cpp
>===================================================================
>--- Source/WebCore/dom/ErrorEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/ErrorEvent.cpp	(working copy)
>@@ -51,7 +51,7 @@ ErrorEvent::ErrorEvent(const AtomicStrin
> }
> 
> ErrorEvent::ErrorEvent(const String& message, const String& fileName, unsigned lineNumber, unsigned columnNumber, JSC::Strong<JSC::Unknown> error)
>-    : Event(eventNames().errorEvent, false, true)
>+    : Event(eventNames().errorEvent, CanBubble::No, IsCancelable::Yes)
>     , m_message(message)
>     , m_fileName(fileName)
>     , m_lineNumber(lineNumber)
>Index: Source/WebCore/dom/Event.cpp
>===================================================================
>--- Source/WebCore/dom/Event.cpp	(revision 234910)
>+++ Source/WebCore/dom/Event.cpp	(working copy)
>@@ -40,21 +40,21 @@ Event::Event(IsTrusted isTrusted)
> {
> }
> 
>-Event::Event(const AtomicString& eventType, bool canBubbleArg, bool cancelableArg)
>+Event::Event(const AtomicString& eventType, CanBubble canBubble, IsCancelable isCancelable)
>     : m_type(eventType)
>     , m_isInitialized(true)
>-    , m_canBubble(canBubbleArg)
>-    , m_cancelable(cancelableArg)
>+    , m_canBubble(canBubble == CanBubble::Yes)
>+    , m_cancelable(isCancelable == IsCancelable::Yes)
>     , m_isTrusted(true)
>     , m_createTime(MonotonicTime::now())
> {
> }
> 
>-Event::Event(const AtomicString& eventType, bool canBubbleArg, bool cancelableArg, MonotonicTime timestamp)
>+Event::Event(const AtomicString& eventType, CanBubble canBubble, IsCancelable isCancelable, MonotonicTime timestamp)
>     : m_type(eventType)
>     , m_isInitialized(true)
>-    , m_canBubble(canBubbleArg)
>-    , m_cancelable(cancelableArg)
>+    , m_canBubble(canBubble == CanBubble::Yes)
>+    , m_cancelable(isCancelable == IsCancelable::Yes)
>     , m_isTrusted(true)
>     , m_createTime(timestamp)
> {
>@@ -73,9 +73,9 @@ Event::Event(const AtomicString& eventTy
> 
> Event::~Event() = default;
> 
>-Ref<Event> Event::create(const AtomicString& type, bool canBubble, bool cancelable)
>+Ref<Event> Event::create(const AtomicString& type, CanBubble canBubble, IsCancelable isCancelable)
> {
>-    return adoptRef(*new Event(type, canBubble, cancelable));
>+    return adoptRef(*new Event(type, canBubble, isCancelable));
> }
> 
> Ref<Event> Event::createForBindings()
>Index: Source/WebCore/dom/Event.h
>===================================================================
>--- Source/WebCore/dom/Event.h	(revision 234910)
>+++ Source/WebCore/dom/Event.h	(working copy)
>@@ -41,6 +41,8 @@ class ScriptExecutionContext;
> class Event : public ScriptWrappable, public RefCounted<Event> {
> public:
>     enum class IsTrusted { No, Yes };
>+    enum class CanBubble { No, Yes };
>+    enum class IsCancelable { No, Yes };
> 
>     enum PhaseType { 
>         NONE = 0,
>@@ -49,7 +51,7 @@ public:
>         BUBBLING_PHASE = 3
>     };
> 
>-    WEBCORE_EXPORT static Ref<Event> create(const AtomicString& type, bool canBubble, bool cancelable);
>+    WEBCORE_EXPORT static Ref<Event> create(const AtomicString& type, CanBubble, IsCancelable);
>     static Ref<Event> createForBindings();
>     static Ref<Event> create(const AtomicString& type, const EventInit&, IsTrusted = IsTrusted::No);
> 
>@@ -139,8 +141,8 @@ public:
> 
> protected:
>     explicit Event(IsTrusted = IsTrusted::No);
>-    Event(const AtomicString& type, bool canBubble, bool cancelable);
>-    Event(const AtomicString& type, bool canBubble, bool cancelable, MonotonicTime timestamp);
>+    Event(const AtomicString& type, CanBubble, IsCancelable);
>+    Event(const AtomicString& type, CanBubble, IsCancelable, MonotonicTime timestamp);
>     Event(const AtomicString& type, const EventInit&, IsTrusted);
> 
>     virtual void receivedTarget() { }
>Index: Source/WebCore/dom/FocusEvent.cpp
>===================================================================
>--- Source/WebCore/dom/FocusEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/FocusEvent.cpp	(working copy)
>@@ -40,7 +40,7 @@ bool FocusEvent::isFocusEvent() const
>     return true;
> }
> 
>-FocusEvent::FocusEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<WindowProxy>&& view, int detail, RefPtr<EventTarget>&& relatedTarget)
>+FocusEvent::FocusEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, RefPtr<WindowProxy>&& view, int detail, RefPtr<EventTarget>&& relatedTarget)
>     : UIEvent(type, canBubble, cancelable, WTFMove(view), detail)
>     , m_relatedTarget(WTFMove(relatedTarget))
> {
>Index: Source/WebCore/dom/FocusEvent.h
>===================================================================
>--- Source/WebCore/dom/FocusEvent.h	(revision 234910)
>+++ Source/WebCore/dom/FocusEvent.h	(working copy)
>@@ -35,7 +35,7 @@ class Node;
> 
> class FocusEvent final : public UIEvent {
> public:
>-    static Ref<FocusEvent> create(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<WindowProxy>&& view, int detail, RefPtr<EventTarget>&& relatedTarget)
>+    static Ref<FocusEvent> create(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, RefPtr<WindowProxy>&& view, int detail, RefPtr<EventTarget>&& relatedTarget)
>     {
>         return adoptRef(*new FocusEvent(type, canBubble, cancelable, WTFMove(view), detail, WTFMove(relatedTarget)));
>     }
>@@ -58,7 +58,7 @@ public:
> 
> private:
>     FocusEvent() = default;
>-    FocusEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<WindowProxy>&&, int, RefPtr<EventTarget>&&);
>+    FocusEvent(const AtomicString& type, CanBubble, IsCancelable, RefPtr<WindowProxy>&&, int, RefPtr<EventTarget>&&);
>     FocusEvent(const AtomicString& type, const Init&, IsTrusted);
> 
>     EventInterface eventInterface() const final;
>Index: Source/WebCore/dom/HashChangeEvent.h
>===================================================================
>--- Source/WebCore/dom/HashChangeEvent.h	(revision 234910)
>+++ Source/WebCore/dom/HashChangeEvent.h	(working copy)
>@@ -69,7 +69,7 @@ private:
>     }
> 
>     HashChangeEvent(const String& oldURL, const String& newURL)
>-        : Event(eventNames().hashchangeEvent, false, false)
>+        : Event(eventNames().hashchangeEvent, CanBubble::No, IsCancelable::No)
>         , m_oldURL(oldURL)
>         , m_newURL(newURL)
>     {
>Index: Source/WebCore/dom/InputEvent.cpp
>===================================================================
>--- Source/WebCore/dom/InputEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/InputEvent.cpp	(working copy)
>@@ -33,12 +33,12 @@
> 
> namespace WebCore {
> 
>-Ref<InputEvent> InputEvent::create(const AtomicString& eventType, const String& inputType, bool canBubble, bool cancelable, RefPtr<WindowProxy>&& view, const String& data, RefPtr<DataTransfer>&& dataTransfer, const Vector<RefPtr<StaticRange>>& targetRanges, int detail)
>+Ref<InputEvent> InputEvent::create(const AtomicString& eventType, const String& inputType, CanBubble canBubble, IsCancelable cancelable, RefPtr<WindowProxy>&& view, const String& data, RefPtr<DataTransfer>&& dataTransfer, const Vector<RefPtr<StaticRange>>& targetRanges, int detail)
> {
>     return adoptRef(*new InputEvent(eventType, inputType, canBubble, cancelable, WTFMove(view), data, WTFMove(dataTransfer), targetRanges, detail));
> }
> 
>-InputEvent::InputEvent(const AtomicString& eventType, const String& inputType, bool canBubble, bool cancelable, RefPtr<WindowProxy>&& view, const String& data, RefPtr<DataTransfer>&& dataTransfer, const Vector<RefPtr<StaticRange>>& targetRanges, int detail)
>+InputEvent::InputEvent(const AtomicString& eventType, const String& inputType, CanBubble canBubble, IsCancelable cancelable, RefPtr<WindowProxy>&& view, const String& data, RefPtr<DataTransfer>&& dataTransfer, const Vector<RefPtr<StaticRange>>& targetRanges, int detail)
>     : UIEvent(eventType, canBubble, cancelable, WTFMove(view), detail)
>     , m_inputType(inputType)
>     , m_data(data)
>Index: Source/WebCore/dom/InputEvent.h
>===================================================================
>--- Source/WebCore/dom/InputEvent.h	(revision 234910)
>+++ Source/WebCore/dom/InputEvent.h	(working copy)
>@@ -39,13 +39,15 @@ public:
>         String data;
>     };
> 
>-    static Ref<InputEvent> create(const AtomicString& eventType, const String& inputType, bool canBubble, bool cancelable, RefPtr<WindowProxy>&& view, const String& data, RefPtr<DataTransfer>&&, const Vector<RefPtr<StaticRange>>& targetRanges, int detail);
>+    static Ref<InputEvent> create(const AtomicString& eventType, const String& inputType, CanBubble, IsCancelable, RefPtr<WindowProxy>&& view,
>+        const String& data, RefPtr<DataTransfer>&&, const Vector<RefPtr<StaticRange>>& targetRanges, int detail);
>+
>     static Ref<InputEvent> create(const AtomicString& type, const Init& initializer, IsTrusted isTrusted = IsTrusted::No)
>     {
>         return adoptRef(*new InputEvent(type, initializer, isTrusted));
>     }
> 
>-    InputEvent(const AtomicString& eventType, const String& inputType, bool canBubble, bool cancelable, RefPtr<WindowProxy>&&, const String& data, RefPtr<DataTransfer>&&, const Vector<RefPtr<StaticRange>>& targetRanges, int detail);
>+    InputEvent(const AtomicString& eventType, const String& inputType, CanBubble, IsCancelable, RefPtr<WindowProxy>&&, const String& data, RefPtr<DataTransfer>&&, const Vector<RefPtr<StaticRange>>& targetRanges, int detail);
>     InputEvent(const AtomicString& eventType, const Init&, IsTrusted);
> 
>     bool isInputEvent() const override { return true; }
>Index: Source/WebCore/dom/KeyboardEvent.cpp
>===================================================================
>--- Source/WebCore/dom/KeyboardEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/KeyboardEvent.cpp	(working copy)
>@@ -94,7 +94,9 @@ static inline KeyboardEvent::KeyLocation
> inline KeyboardEvent::KeyboardEvent() = default;
> 
> inline KeyboardEvent::KeyboardEvent(const PlatformKeyboardEvent& key, RefPtr<WindowProxy>&& view)
>-    : UIEventWithKeyState(eventTypeForKeyboardEventType(key.type()), true, true, key.timestamp().approximateMonotonicTime(), view.copyRef(), 0, key.ctrlKey(), key.altKey(), key.shiftKey(), key.metaKey(), false, key.modifiers().contains(PlatformEvent::Modifier::CapsLockKey))
>+    : UIEventWithKeyState(eventTypeForKeyboardEventType(key.type()), CanBubble::Yes, IsCancelable::Yes,
>+        key.timestamp().approximateMonotonicTime(), view.copyRef(), 0, key.ctrlKey(), key.altKey(), key.shiftKey(), key.metaKey(),
>+        false, key.modifiers().contains(PlatformEvent::Modifier::CapsLockKey))
>     , m_underlyingPlatformEvent(std::make_unique<PlatformKeyboardEvent>(key))
> #if ENABLE(KEYBOARD_KEY_ATTRIBUTE)
>     , m_key(key.key())
>Index: Source/WebCore/dom/MessageEvent.cpp
>===================================================================
>--- Source/WebCore/dom/MessageEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/MessageEvent.cpp	(working copy)
>@@ -49,7 +49,7 @@ inline MessageEvent::MessageEvent(const 
> }
> 
> inline MessageEvent::MessageEvent(DataType&& data, const String& origin, const String& lastEventId, std::optional<MessageEventSource>&& source, Vector<RefPtr<MessagePort>>&& ports)
>-    : Event(eventNames().messageEvent, false, false)
>+    : Event(eventNames().messageEvent, CanBubble::No, IsCancelable::No)
>     , m_data(WTFMove(data))
>     , m_origin(origin)
>     , m_lastEventId(lastEventId)
>@@ -59,7 +59,7 @@ inline MessageEvent::MessageEvent(DataTy
> }
> 
> inline MessageEvent::MessageEvent(const AtomicString& type, Ref<SerializedScriptValue>&& data, const String& origin, const String& lastEventId)
>-    : Event(type, false, false)
>+    : Event(type, CanBubble::No, IsCancelable::No)
>     , m_data(WTFMove(data))
>     , m_origin(origin)
>     , m_lastEventId(lastEventId)
>Index: Source/WebCore/dom/MouseEvent.cpp
>===================================================================
>--- Source/WebCore/dom/MouseEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/MouseEvent.cpp	(working copy)
>@@ -47,8 +47,8 @@ Ref<MouseEvent> MouseEvent::create(const
> Ref<MouseEvent> MouseEvent::create(const AtomicString& eventType, RefPtr<WindowProxy>&& view, const PlatformMouseEvent& event, int detail, Node* relatedTarget)
> {
>     bool isMouseEnterOrLeave = eventType == eventNames().mouseenterEvent || eventType == eventNames().mouseleaveEvent;
>-    bool isCancelable = eventType != eventNames().mousemoveEvent && !isMouseEnterOrLeave;
>-    bool canBubble = !isMouseEnterOrLeave;
>+    auto isCancelable = eventType != eventNames().mousemoveEvent && !isMouseEnterOrLeave ? IsCancelable::Yes : IsCancelable::No;
>+    auto canBubble = !isMouseEnterOrLeave ? CanBubble::Yes : CanBubble::No;
> 
>     return MouseEvent::create(eventType, canBubble, isCancelable, event.timestamp().approximateMonotonicTime(), WTFMove(view),
>         detail, event.globalPosition().x(), event.globalPosition().y(), event.position().x(), event.position().y(),
>@@ -59,7 +59,7 @@ Ref<MouseEvent> MouseEvent::create(const
>         relatedTarget, event.force(), event.syntheticClickType());
> }
> 
>-Ref<MouseEvent> MouseEvent::create(const AtomicString& type, bool canBubble, bool cancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&& view, int detail, int screenX, int screenY, int pageX, int pageY,
>+Ref<MouseEvent> MouseEvent::create(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&& view, int detail, int screenX, int screenY, int pageX, int pageY,
> #if ENABLE(POINTER_LOCK)
>     int movementX, int movementY,
> #endif
>@@ -73,14 +73,14 @@ Ref<MouseEvent> MouseEvent::create(const
>         ctrlKey, altKey, shiftKey, metaKey, button, buttons, relatedTarget, force, syntheticClickType, dataTransfer, isSimulated));
> }
> 
>-Ref<MouseEvent> MouseEvent::create(const AtomicString& eventType, bool canBubble, bool cancelable, RefPtr<WindowProxy>&& view, int detail, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, unsigned short buttons, unsigned short syntheticClickType, EventTarget* relatedTarget)
>+Ref<MouseEvent> MouseEvent::create(const AtomicString& eventType, CanBubble canBubble, IsCancelable cancelable, RefPtr<WindowProxy>&& view, int detail, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, unsigned short buttons, unsigned short syntheticClickType, EventTarget* relatedTarget)
> {
>     return adoptRef(*new MouseEvent(eventType, canBubble, cancelable, WTFMove(view), detail, { screenX, screenY }, { clientX, clientY }, ctrlKey, altKey, shiftKey, metaKey, button, buttons, syntheticClickType, relatedTarget));
> }
> 
> MouseEvent::MouseEvent() = default;
> 
>-MouseEvent::MouseEvent(const AtomicString& eventType, bool canBubble, bool cancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&& view, int detail, const IntPoint& screenLocation, const IntPoint& windowLocation,
>+MouseEvent::MouseEvent(const AtomicString& eventType, CanBubble canBubble, IsCancelable cancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&& view, int detail, const IntPoint& screenLocation, const IntPoint& windowLocation,
> #if ENABLE(POINTER_LOCK)
>         const IntPoint& movementDelta,
> #endif
>@@ -100,7 +100,7 @@ MouseEvent::MouseEvent(const AtomicStrin
> {
> }
> 
>-MouseEvent::MouseEvent(const AtomicString& eventType, bool canBubble, bool cancelable, RefPtr<WindowProxy>&& view, int detail, const IntPoint& screenLocation, const IntPoint& clientLocation, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, unsigned short buttons, unsigned short syntheticClickType, EventTarget* relatedTarget)
>+MouseEvent::MouseEvent(const AtomicString& eventType, CanBubble canBubble, IsCancelable cancelable, RefPtr<WindowProxy>&& view, int detail, const IntPoint& screenLocation, const IntPoint& clientLocation, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, unsigned short buttons, unsigned short syntheticClickType, EventTarget* relatedTarget)
>     : MouseRelatedEvent(eventType, canBubble, cancelable, MonotonicTime::now(), WTFMove(view), detail, screenLocation, { },
> #if ENABLE(POINTER_LOCK)
>         { },
>Index: Source/WebCore/dom/MouseEvent.h
>===================================================================
>--- Source/WebCore/dom/MouseEvent.h	(revision 234910)
>+++ Source/WebCore/dom/MouseEvent.h	(working copy)
>@@ -34,15 +34,19 @@ class PlatformMouseEvent;
> 
> class MouseEvent : public MouseRelatedEvent {
> public:
>-    WEBCORE_EXPORT static Ref<MouseEvent> create(const AtomicString& type, bool canBubble, bool cancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&&, int detail, int screenX, int screenY, int pageX, int pageY,
>+    WEBCORE_EXPORT static Ref<MouseEvent> create(const AtomicString& type, CanBubble, IsCancelable, MonotonicTime timestamp,
>+        RefPtr<WindowProxy>&&, int detail, int screenX, int screenY, int pageX, int pageY,
> #if ENABLE(POINTER_LOCK)
>         int movementX, int movementY,
> #endif
>-        bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, unsigned short buttons, EventTarget* relatedTarget, double force, unsigned short syntheticClickType, DataTransfer* = nullptr, bool isSimulated = false);
>+        bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, unsigned short buttons,
>+        EventTarget* relatedTarget, double force, unsigned short syntheticClickType, DataTransfer* = nullptr, bool isSimulated = false);
> 
>     WEBCORE_EXPORT static Ref<MouseEvent> create(const AtomicString& eventType, RefPtr<WindowProxy>&&, const PlatformMouseEvent&, int detail, Node* relatedTarget);
> 
>-    static Ref<MouseEvent> create(const AtomicString& eventType, bool canBubble, bool cancelable, RefPtr<WindowProxy>&&, int detail, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, unsigned short buttons, unsigned short syntheticClickType, EventTarget* relatedTarget);
>+    static Ref<MouseEvent> create(const AtomicString& eventType, CanBubble, IsCancelable, RefPtr<WindowProxy>&&,
>+        int detail, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey,
>+        unsigned short button, unsigned short buttons, unsigned short syntheticClickType, EventTarget* relatedTarget);
> 
>     static Ref<MouseEvent> createForBindings() { return adoptRef(*new MouseEvent); }
> 
>@@ -50,8 +54,13 @@ public:
> 
>     virtual ~MouseEvent();
> 
>-    WEBCORE_EXPORT void initMouseEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<WindowProxy>&&, int detail, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, EventTarget* relatedTarget);
>-    void initMouseEventQuirk(JSC::ExecState&, ScriptExecutionContext&, const AtomicString& type, bool canBubble, bool cancelable, RefPtr<WindowProxy>&&, int detail, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, JSC::JSValue relatedTarget);
>+    WEBCORE_EXPORT void initMouseEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<WindowProxy>&&,
>+        int detail, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey,
>+        unsigned short button, EventTarget* relatedTarget);
>+
>+    void initMouseEventQuirk(JSC::ExecState&, ScriptExecutionContext&, const AtomicString& type, bool canBubble, bool cancelable, RefPtr<WindowProxy>&&,
>+        int detail, int screenX, int screenY, int clientX, int clientY, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey,
>+        unsigned short button, JSC::JSValue relatedTarget);
> 
>     unsigned short button() const { return m_button; }
>     unsigned short buttons() const { return m_buttons; }
>@@ -71,7 +80,7 @@ public:
>     int which() const final;
> 
> protected:
>-    MouseEvent(const AtomicString& type, bool canBubble, bool cancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&&,
>+    MouseEvent(const AtomicString& type, CanBubble, IsCancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&&,
>         int detail, const IntPoint& screenLocation, const IntPoint& windowLocation,
> #if ENABLE(POINTER_LOCK)
>         const IntPoint& movementDelta,
>@@ -79,7 +88,7 @@ protected:
>         bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, unsigned short button, unsigned short buttons,
>         EventTarget* relatedTarget, double force, unsigned short syntheticClickType, DataTransfer*, bool isSimulated);
> 
>-    MouseEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<WindowProxy>&&,
>+    MouseEvent(const AtomicString& type, CanBubble, IsCancelable, RefPtr<WindowProxy>&&,
>         int detail, const IntPoint& screenLocation, const IntPoint& clientLocation,
>         bool ctrlKey, bool altKey, bool shiftKey, bool metaKey,
>         unsigned short button, unsigned short buttons, unsigned short syntheticClickType, EventTarget* relatedTarget);
>Index: Source/WebCore/dom/MouseRelatedEvent.cpp
>===================================================================
>--- Source/WebCore/dom/MouseRelatedEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/MouseRelatedEvent.cpp	(working copy)
>@@ -33,7 +33,7 @@
> 
> namespace WebCore {
> 
>-MouseRelatedEvent::MouseRelatedEvent(const AtomicString& eventType, bool canBubble, bool cancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&& view,
>+MouseRelatedEvent::MouseRelatedEvent(const AtomicString& eventType, CanBubble canBubble, IsCancelable cancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&& view,
>                                      int detail, const IntPoint& screenLocation, const IntPoint& windowLocation,
> #if ENABLE(POINTER_LOCK)
>                                      const IntPoint& movementDelta,
>Index: Source/WebCore/dom/MouseRelatedEvent.h
>===================================================================
>--- Source/WebCore/dom/MouseRelatedEvent.h	(revision 234910)
>+++ Source/WebCore/dom/MouseRelatedEvent.h	(working copy)
>@@ -74,7 +74,7 @@ public:
> 
> protected:
>     MouseRelatedEvent() = default;
>-    MouseRelatedEvent(const AtomicString& type, bool canBubble, bool cancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&&,
>+    MouseRelatedEvent(const AtomicString& type, CanBubble, IsCancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&&,
>         int detail, const IntPoint& screenLocation, const IntPoint& windowLocation,
> #if ENABLE(POINTER_LOCK)
>         const IntPoint& movementDelta,
>Index: Source/WebCore/dom/MutationEvent.cpp
>===================================================================
>--- Source/WebCore/dom/MutationEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/MutationEvent.cpp	(working copy)
>@@ -25,7 +25,7 @@
> 
> namespace WebCore {
> 
>-MutationEvent::MutationEvent(const AtomicString& type, bool canBubble, bool cancelable, Node* relatedNode, const String& prevValue, const String& newValue)
>+MutationEvent::MutationEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, Node* relatedNode, const String& prevValue, const String& newValue)
>     : Event(type, canBubble, cancelable)
>     , m_relatedNode(relatedNode)
>     , m_prevValue(prevValue)
>Index: Source/WebCore/dom/MutationEvent.h
>===================================================================
>--- Source/WebCore/dom/MutationEvent.h	(revision 234910)
>+++ Source/WebCore/dom/MutationEvent.h	(working copy)
>@@ -36,9 +36,9 @@ public:
>         REMOVAL = 3
>     };
> 
>-    static Ref<MutationEvent> create(const AtomicString& type, bool canBubble, Node* relatedNode = nullptr, const String& prevValue = String(), const String& newValue = String())
>+    static Ref<MutationEvent> create(const AtomicString& type, CanBubble canBubble, Node* relatedNode = nullptr, const String& prevValue = String(), const String& newValue = String())
>     {
>-        return adoptRef(*new MutationEvent(type, canBubble, false, relatedNode, prevValue, newValue));
>+        return adoptRef(*new MutationEvent(type, canBubble, IsCancelable::No, relatedNode, prevValue, newValue));
>     }
> 
>     static Ref<MutationEvent> createForBindings()
>@@ -56,7 +56,7 @@ public:
> 
> private:
>     MutationEvent() = default;
>-    MutationEvent(const AtomicString& type, bool canBubble, bool cancelable, Node* relatedNode, const String& prevValue, const String& newValue);
>+    MutationEvent(const AtomicString& type, CanBubble, IsCancelable, Node* relatedNode, const String& prevValue, const String& newValue);
> 
>     EventInterface eventInterface() const final;
> 
>Index: Source/WebCore/dom/Node.cpp
>===================================================================
>--- Source/WebCore/dom/Node.cpp	(revision 234910)
>+++ Source/WebCore/dom/Node.cpp	(working copy)
>@@ -2342,14 +2342,14 @@ void Node::dispatchSubtreeModifiedEvent(
>     if (!parentNode() && !hasEventListeners(subtreeModifiedEventName))
>         return;
> 
>-    dispatchScopedEvent(MutationEvent::create(subtreeModifiedEventName, true));
>+    dispatchScopedEvent(MutationEvent::create(subtreeModifiedEventName, Event::CanBubble::Yes));
> }
> 
> void Node::dispatchDOMActivateEvent(Event& underlyingClickEvent)
> {
>     ASSERT_WITH_SECURITY_IMPLICATION(ScriptDisallowedScope::InMainThread::isScriptAllowed());
>     int detail = is<UIEvent>(underlyingClickEvent) ? downcast<UIEvent>(underlyingClickEvent).detail() : 0;
>-    auto event = UIEvent::create(eventNames().DOMActivateEvent, true, true, document().windowProxy(), detail);
>+    auto event = UIEvent::create(eventNames().DOMActivateEvent, Event::CanBubble::Yes, Event::IsCancelable::Yes, document().windowProxy(), detail);
>     event->setUnderlyingEvent(&underlyingClickEvent);
>     dispatchScopedEvent(event);
>     if (event->defaultHandled())
>@@ -2369,7 +2369,7 @@ bool Node::dispatchBeforeLoadEvent(const
> 
> void Node::dispatchInputEvent()
> {
>-    dispatchScopedEvent(Event::create(eventNames().inputEvent, true, false));
>+    dispatchScopedEvent(Event::create(eventNames().inputEvent, Event::CanBubble::Yes, Event::IsCancelable::No));
> }
> 
> void Node::defaultEventHandler(Event& event)
>Index: Source/WebCore/dom/OverflowEvent.cpp
>===================================================================
>--- Source/WebCore/dom/OverflowEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/OverflowEvent.cpp	(working copy)
>@@ -38,7 +38,7 @@ OverflowEvent::OverflowEvent()
> }
> 
> OverflowEvent::OverflowEvent(bool horizontalOverflowChanged, bool horizontalOverflow, bool verticalOverflowChanged, bool verticalOverflow)
>-    : Event(eventNames().overflowchangedEvent, false, false)
>+    : Event(eventNames().overflowchangedEvent, CanBubble::No, IsCancelable::No)
>     , m_horizontalOverflow(horizontalOverflow)
>     , m_verticalOverflow(verticalOverflow)
> {
>Index: Source/WebCore/dom/PageTransitionEvent.cpp
>===================================================================
>--- Source/WebCore/dom/PageTransitionEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/PageTransitionEvent.cpp	(working copy)
>@@ -29,7 +29,7 @@
> namespace WebCore {
> 
> PageTransitionEvent::PageTransitionEvent(const AtomicString& type, bool persisted)
>-    : Event(type, true, true)
>+    : Event(type, CanBubble::Yes, IsCancelable::Yes)
>     , m_persisted(persisted)
> {
> }
>Index: Source/WebCore/dom/PopStateEvent.cpp
>===================================================================
>--- Source/WebCore/dom/PopStateEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/PopStateEvent.cpp	(working copy)
>@@ -40,7 +40,7 @@ PopStateEvent::PopStateEvent(const Atomi
> }
> 
> PopStateEvent::PopStateEvent(RefPtr<SerializedScriptValue>&& serializedState, History* history)
>-    : Event(eventNames().popstateEvent, false, false)
>+    : Event(eventNames().popstateEvent, CanBubble::No, IsCancelable::No)
>     , m_serializedState(WTFMove(serializedState))
>     , m_history(history)
> {
>Index: Source/WebCore/dom/ProgressEvent.cpp
>===================================================================
>--- Source/WebCore/dom/ProgressEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/ProgressEvent.cpp	(working copy)
>@@ -37,7 +37,7 @@ ProgressEvent::ProgressEvent(const Atomi
> }
> 
> ProgressEvent::ProgressEvent(const AtomicString& type, bool lengthComputable, unsigned long long loaded, unsigned long long total)
>-    : Event(type, false, false)
>+    : Event(type, CanBubble::No, IsCancelable::No)
>     , m_lengthComputable(lengthComputable)
>     , m_loaded(loaded)
>     , m_total(total)
>Index: Source/WebCore/dom/ScriptElement.cpp
>===================================================================
>--- Source/WebCore/dom/ScriptElement.cpp	(revision 234910)
>+++ Source/WebCore/dom/ScriptElement.cpp	(working copy)
>@@ -125,7 +125,7 @@ static bool isLegacySupportedJavaScriptL
> 
> void ScriptElement::dispatchErrorEvent()
> {
>-    m_element.dispatchEvent(Event::create(eventNames().errorEvent, false, false));
>+    m_element.dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> std::optional<ScriptElement::ScriptType> ScriptElement::determineScriptType(LegacyTypeSupport supportLegacyTypes) const
>Index: Source/WebCore/dom/SecurityPolicyViolationEvent.h
>===================================================================
>--- Source/WebCore/dom/SecurityPolicyViolationEvent.h	(revision 234910)
>+++ Source/WebCore/dom/SecurityPolicyViolationEvent.h	(working copy)
>@@ -31,7 +31,7 @@ namespace WebCore {
> 
> class SecurityPolicyViolationEvent final : public Event {
> public:
>-    static Ref<SecurityPolicyViolationEvent> create(const AtomicString& type, bool canBubble, bool cancelable, const String& documentURI, const String& referrer, const String& blockedURI, const String& violatedDirective, const String& effectiveDirective, const String& originalPolicy, const String& sourceFile, unsigned short statusCode, int lineNumber, int columnNumber)
>+    static Ref<SecurityPolicyViolationEvent> create(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, const String& documentURI, const String& referrer, const String& blockedURI, const String& violatedDirective, const String& effectiveDirective, const String& originalPolicy, const String& sourceFile, unsigned short statusCode, int lineNumber, int columnNumber)
>     {
>         return adoptRef(*new SecurityPolicyViolationEvent(type, canBubble, cancelable, documentURI, referrer, blockedURI, violatedDirective, effectiveDirective, originalPolicy, sourceFile, statusCode, lineNumber, columnNumber));
>     }
>@@ -80,7 +80,7 @@ private:
>     {
>     }
> 
>-    SecurityPolicyViolationEvent(const AtomicString& type, bool canBubble, bool cancelable, const String& documentURI, const String& referrer, const String& blockedURI, const String& violatedDirective, const String& effectiveDirective, const String& originalPolicy, const String& sourceFile, unsigned short statusCode, int lineNumber, int columnNumber)
>+    SecurityPolicyViolationEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, const String& documentURI, const String& referrer, const String& blockedURI, const String& violatedDirective, const String& effectiveDirective, const String& originalPolicy, const String& sourceFile, unsigned short statusCode, int lineNumber, int columnNumber)
>         : Event(type, canBubble, cancelable)
>         , m_documentURI(documentURI)
>         , m_referrer(referrer)
>Index: Source/WebCore/dom/SimulatedClick.cpp
>===================================================================
>--- Source/WebCore/dom/SimulatedClick.cpp	(revision 234910)
>+++ Source/WebCore/dom/SimulatedClick.cpp	(working copy)
>@@ -44,7 +44,7 @@ public:
> 
> private:
>     SimulatedMouseEvent(const AtomicString& eventType, RefPtr<WindowProxy>&& view, RefPtr<Event>&& underlyingEvent, Element& target, SimulatedClickSource source)
>-        : MouseEvent(eventType, true, true, underlyingEvent ? underlyingEvent->timeStamp() : MonotonicTime::now(), WTFMove(view), 0, { }, { },
>+        : MouseEvent(eventType, CanBubble::Yes, IsCancelable::Yes, underlyingEvent ? underlyingEvent->timeStamp() : MonotonicTime::now(), WTFMove(view), 0, { }, { },
> #if ENABLE(POINTER_LOCK)
>             { },
> #endif
>Index: Source/WebCore/dom/TextEvent.cpp
>===================================================================
>--- Source/WebCore/dom/TextEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/TextEvent.cpp	(working copy)
>@@ -72,7 +72,7 @@ TextEvent::TextEvent()
> }
> 
> TextEvent::TextEvent(RefPtr<WindowProxy>&& view, const String& data, TextEventInputType inputType)
>-    : UIEvent(eventNames().textInputEvent, true, true, WTFMove(view), 0)
>+    : UIEvent(eventNames().textInputEvent, CanBubble::Yes, IsCancelable::Yes, WTFMove(view), 0)
>     , m_inputType(inputType)
>     , m_data(data)
>     , m_shouldSmartReplace(false)
>@@ -82,7 +82,7 @@ TextEvent::TextEvent(RefPtr<WindowProxy>
> }
> 
> TextEvent::TextEvent(RefPtr<WindowProxy>&& view, const String& data, RefPtr<DocumentFragment>&& pastingFragment, bool shouldSmartReplace, bool shouldMatchStyle, MailBlockquoteHandling mailBlockquoteHandling)
>-    : UIEvent(eventNames().textInputEvent, true, true, WTFMove(view), 0)
>+    : UIEvent(eventNames().textInputEvent, CanBubble::Yes, IsCancelable::Yes, WTFMove(view), 0)
>     , m_inputType(TextEventInputPaste)
>     , m_data(data)
>     , m_pastingFragment(WTFMove(pastingFragment))
>@@ -93,7 +93,7 @@ TextEvent::TextEvent(RefPtr<WindowProxy>
> }
> 
> TextEvent::TextEvent(RefPtr<WindowProxy>&& view, const String& data, const Vector<DictationAlternative>& dictationAlternatives)
>-    : UIEvent(eventNames().textInputEvent, true, true, WTFMove(view), 0)
>+    : UIEvent(eventNames().textInputEvent, CanBubble::Yes, IsCancelable::Yes, WTFMove(view), 0)
>     , m_inputType(TextEventInputDictation)
>     , m_data(data)
>     , m_shouldSmartReplace(false)
>Index: Source/WebCore/dom/TransitionEvent.cpp
>===================================================================
>--- Source/WebCore/dom/TransitionEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/TransitionEvent.cpp	(working copy)
>@@ -30,7 +30,7 @@
> namespace WebCore {
> 
> TransitionEvent::TransitionEvent(const AtomicString& type, const String& propertyName, double elapsedTime, const String& pseudoElement)
>-    : Event(type, true, true)
>+    : Event(type, CanBubble::Yes, IsCancelable::Yes)
>     , m_propertyName(propertyName)
>     , m_elapsedTime(elapsedTime)
>     , m_pseudoElement(pseudoElement)
>Index: Source/WebCore/dom/UIEvent.cpp
>===================================================================
>--- Source/WebCore/dom/UIEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/UIEvent.cpp	(working copy)
>@@ -32,15 +32,15 @@ UIEvent::UIEvent()
> {
> }
> 
>-UIEvent::UIEvent(const AtomicString& eventType, bool canBubbleArg, bool cancelableArg, RefPtr<WindowProxy>&& viewArg, int detailArg)
>-    : Event(eventType, canBubbleArg, cancelableArg)
>+UIEvent::UIEvent(const AtomicString& eventType, CanBubble canBubble, IsCancelable cancelable, RefPtr<WindowProxy>&& viewArg, int detailArg)
>+    : Event(eventType, canBubble, cancelable)
>     , m_view(WTFMove(viewArg))
>     , m_detail(detailArg)
> {
> }
> 
>-UIEvent::UIEvent(const AtomicString& eventType, bool canBubbleArg, bool cancelableArg, MonotonicTime timestamp, RefPtr<WindowProxy>&& viewArg, int detailArg)
>-    : Event(eventType, canBubbleArg, cancelableArg, timestamp)
>+UIEvent::UIEvent(const AtomicString& eventType, CanBubble canBubble, IsCancelable cancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&& viewArg, int detailArg)
>+    : Event(eventType, canBubble, cancelable, timestamp)
>     , m_view(WTFMove(viewArg))
>     , m_detail(detailArg)
> {
>Index: Source/WebCore/dom/UIEvent.h
>===================================================================
>--- Source/WebCore/dom/UIEvent.h	(revision 234910)
>+++ Source/WebCore/dom/UIEvent.h	(working copy)
>@@ -34,7 +34,7 @@ typedef WindowProxy AbstractView;
> 
> class UIEvent : public Event {
> public:
>-    static Ref<UIEvent> create(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<WindowProxy>&& view, int detail)
>+    static Ref<UIEvent> create(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, RefPtr<WindowProxy>&& view, int detail)
>     {
>         return adoptRef(*new UIEvent(type, canBubble, cancelable, WTFMove(view), detail));
>     }
>@@ -65,8 +65,8 @@ public:
> 
> protected:
>     UIEvent();
>-    UIEvent(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<WindowProxy>&&, int detail);
>-    UIEvent(const AtomicString& type, bool canBubble, bool cancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&&, int detail);
>+    UIEvent(const AtomicString& type, CanBubble, IsCancelable, RefPtr<WindowProxy>&&, int detail);
>+    UIEvent(const AtomicString& type, CanBubble, IsCancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&&, int detail);
>     UIEvent(const AtomicString&, const UIEventInit&, IsTrusted);
> 
> private:
>Index: Source/WebCore/dom/UIEventWithKeyState.h
>===================================================================
>--- Source/WebCore/dom/UIEventWithKeyState.h	(revision 234910)
>+++ Source/WebCore/dom/UIEventWithKeyState.h	(working copy)
>@@ -40,7 +40,7 @@ public:
> protected:
>     UIEventWithKeyState() = default;
> 
>-    UIEventWithKeyState(const AtomicString& type, bool canBubble, bool cancelable, RefPtr<WindowProxy>&& view, int detail, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
>+    UIEventWithKeyState(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, RefPtr<WindowProxy>&& view, int detail, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey)
>         : UIEvent(type, canBubble, cancelable, WTFMove(view), detail)
>         , m_ctrlKey(ctrlKey)
>         , m_altKey(altKey)
>@@ -49,7 +49,7 @@ protected:
>     {
>     }
> 
>-    UIEventWithKeyState(const AtomicString& type, bool canBubble, bool cancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&& view,
>+    UIEventWithKeyState(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, MonotonicTime timestamp, RefPtr<WindowProxy>&& view,
>         int detail, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, bool altGraphKey, bool capsLockKey)
>             : UIEvent(type, canBubble, cancelable, timestamp, WTFMove(view), detail)
>             , m_ctrlKey(ctrlKey)
>Index: Source/WebCore/dom/WebKitAnimationEvent.cpp
>===================================================================
>--- Source/WebCore/dom/WebKitAnimationEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/WebKitAnimationEvent.cpp	(working copy)
>@@ -36,7 +36,7 @@ WebKitAnimationEvent::WebKitAnimationEve
> }
> 
> WebKitAnimationEvent::WebKitAnimationEvent(const AtomicString& type, const String& animationName, double elapsedTime)
>-    : Event(type, true, true)
>+    : Event(type, CanBubble::Yes, IsCancelable::Yes)
>     , m_animationName(animationName)
>     , m_elapsedTime(elapsedTime)
> {
>Index: Source/WebCore/dom/WebKitTransitionEvent.cpp
>===================================================================
>--- Source/WebCore/dom/WebKitTransitionEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/WebKitTransitionEvent.cpp	(working copy)
>@@ -29,7 +29,7 @@
> namespace WebCore {
> 
> WebKitTransitionEvent::WebKitTransitionEvent(const AtomicString& type, const String& propertyName, double elapsedTime, const String& pseudoElement)
>-    : Event(type, true, true)
>+    : Event(type, CanBubble::Yes, IsCancelable::Yes)
>     , m_propertyName(propertyName)
>     , m_elapsedTime(elapsedTime)
>     , m_pseudoElement(pseudoElement)
>Index: Source/WebCore/dom/WheelEvent.cpp
>===================================================================
>--- Source/WebCore/dom/WheelEvent.cpp	(revision 234910)
>+++ Source/WebCore/dom/WheelEvent.cpp	(working copy)
>@@ -48,7 +48,7 @@ inline WheelEvent::WheelEvent(const Atom
> }
> 
> inline WheelEvent::WheelEvent(const PlatformWheelEvent& event, RefPtr<WindowProxy>&& view)
>-    : MouseEvent(eventNames().wheelEvent, true, true, event.timestamp().approximateMonotonicTime(), WTFMove(view), 0, event.globalPosition(), event.position()
>+    : MouseEvent(eventNames().wheelEvent, CanBubble::Yes, IsCancelable::Yes, event.timestamp().approximateMonotonicTime(), WTFMove(view), 0, event.globalPosition(), event.position()
> #if ENABLE(POINTER_LOCK)
>         , { }
> #endif
>Index: Source/WebCore/editing/Editor.cpp
>===================================================================
>--- Source/WebCore/editing/Editor.cpp	(revision 234910)
>+++ Source/WebCore/editing/Editor.cpp	(working copy)
>@@ -110,12 +110,12 @@
> 
> namespace WebCore {
> 
>-static bool dispatchBeforeInputEvent(Element& element, const AtomicString& inputType, const String& data = { }, RefPtr<DataTransfer>&& dataTransfer = nullptr, const Vector<RefPtr<StaticRange>>& targetRanges = { }, bool cancelable = true)
>+static bool dispatchBeforeInputEvent(Element& element, const AtomicString& inputType, const String& data = { }, RefPtr<DataTransfer>&& dataTransfer = nullptr, const Vector<RefPtr<StaticRange>>& targetRanges = { }, Event::IsCancelable cancelable = Event::IsCancelable::Yes)
> {
>     if (!element.document().settings().inputEventsEnabled())
>         return true;
> 
>-    auto event = InputEvent::create(eventNames().beforeinputEvent, inputType, true, cancelable, element.document().windowProxy(), data, WTFMove(dataTransfer), targetRanges, 0);
>+    auto event = InputEvent::create(eventNames().beforeinputEvent, inputType, Event::CanBubble::Yes, cancelable, element.document().windowProxy(), data, WTFMove(dataTransfer), targetRanges, 0);
>     element.dispatchEvent(event);
>     return !event->defaultPrevented();
> }
>@@ -127,7 +127,8 @@ static void dispatchInputEvent(Element& 
>         // but TypingCommands are special in that existing TypingCommands that are applied again fire input events *from within* the scope by calling typingAddedToOpenCommand.
>         // Instead, TypingCommands should always dispatch events synchronously after the end of the scoped queue in CompositeEditCommand::apply. To work around this for the
>         // time being, just revert back to calling dispatchScopedEvent.
>-        element.dispatchScopedEvent(InputEvent::create(eventNames().inputEvent, inputType, true, false, element.document().windowProxy(), data, WTFMove(dataTransfer), targetRanges, 0));
>+        element.dispatchScopedEvent(InputEvent::create(eventNames().inputEvent, inputType, Event::CanBubble::Yes, Event::IsCancelable::No,
>+            element.document().windowProxy(), data, WTFMove(dataTransfer), targetRanges, 0));
>     } else
>         element.dispatchInputEvent();
> }
>@@ -1029,7 +1030,7 @@ static void notifyTextFromControls(Eleme
>         endingTextControl->didEditInnerTextValue();
> }
> 
>-static bool dispatchBeforeInputEvents(RefPtr<Element> startRoot, RefPtr<Element> endRoot, const AtomicString& inputTypeName, const String& data = { }, RefPtr<DataTransfer>&& dataTransfer = nullptr, const Vector<RefPtr<StaticRange>>& targetRanges = { }, bool cancelable = true)
>+static bool dispatchBeforeInputEvents(RefPtr<Element> startRoot, RefPtr<Element> endRoot, const AtomicString& inputTypeName, const String& data = { }, RefPtr<DataTransfer>&& dataTransfer = nullptr, const Vector<RefPtr<StaticRange>>& targetRanges = { }, Event::IsCancelable cancelable = Event::IsCancelable::Yes)
> {
>     bool continueWithDefaultBehavior = true;
>     if (startRoot)
>@@ -1056,7 +1057,8 @@ bool Editor::willApplyEditing(CompositeE
>     if (!composition)
>         return true;
> 
>-    return dispatchBeforeInputEvents(composition->startingRootEditableElement(), composition->endingRootEditableElement(), command.inputEventTypeName(), command.inputEventData(), command.inputEventDataTransfer(), targetRanges, command.isBeforeInputEventCancelable());
>+    return dispatchBeforeInputEvents(composition->startingRootEditableElement(), composition->endingRootEditableElement(), command.inputEventTypeName(),
>+        command.inputEventData(), command.inputEventDataTransfer(), targetRanges, command.isBeforeInputEventCancelable() ? Event::IsCancelable::Yes : Event::IsCancelable::No);
> }
> 
> void Editor::appliedEditing(CompositeEditCommand& command)
>Index: Source/WebCore/editing/FrameSelection.cpp
>===================================================================
>--- Source/WebCore/editing/FrameSelection.cpp	(revision 234910)
>+++ Source/WebCore/editing/FrameSelection.cpp	(working copy)
>@@ -353,7 +353,7 @@ bool FrameSelection::setSelectionWithout
>     m_xPosForVerticalArrowNavigation = NoXPosForVerticalArrowNavigation();
>     selectFrameElementInParentIfFullySelected();
>     m_frame->editor().respondToChangedSelection(oldSelection, options);
>-    m_frame->document()->enqueueDocumentEvent(Event::create(eventNames().selectionchangeEvent, false, false));
>+    m_frame->document()->enqueueDocumentEvent(Event::create(eventNames().selectionchangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
> 
>     return true;
> }
>@@ -1965,7 +1965,7 @@ void FrameSelection::selectAll()
>         return;
> 
>     if (selectStartTarget) {
>-        auto event = Event::create(eventNames().selectstartEvent, true, true);
>+        auto event = Event::create(eventNames().selectstartEvent, Event::CanBubble::Yes, Event::IsCancelable::Yes);
>         selectStartTarget->dispatchEvent(event);
>         if (event->defaultPrevented())
>             return;
>@@ -2425,7 +2425,7 @@ bool FrameSelection::dispatchSelectStart
>     if (!selectStartTarget)
>         return true;
> 
>-    auto event = Event::create(eventNames().selectstartEvent, true, true);
>+    auto event = Event::create(eventNames().selectstartEvent, Event::CanBubble::Yes, Event::IsCancelable::Yes);
>     selectStartTarget->dispatchEvent(event);
>     return !event->defaultPrevented();
> }
>Index: Source/WebCore/html/HTMLDetailsElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLDetailsElement.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLDetailsElement.cpp	(working copy)
>@@ -142,7 +142,7 @@ bool HTMLDetailsElement::isActiveSummary
> void HTMLDetailsElement::dispatchPendingEvent(DetailEventSender* eventSender)
> {
>     ASSERT_UNUSED(eventSender, eventSender == &detailToggleEventSender());
>-    dispatchEvent(Event::create(eventNames().toggleEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().toggleEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void HTMLDetailsElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
>Index: Source/WebCore/html/HTMLFormControlElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLFormControlElement.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLFormControlElement.cpp	(working copy)
>@@ -317,7 +317,7 @@ void HTMLFormControlElement::setChangedS
> 
> void HTMLFormControlElement::dispatchChangeEvent()
> {
>-    dispatchScopedEvent(Event::create(eventNames().changeEvent, true, false));
>+    dispatchScopedEvent(Event::create(eventNames().changeEvent, Event::CanBubble::Yes, Event::IsCancelable::No));
> }
> 
> void HTMLFormControlElement::dispatchFormControlChangeEvent()
>@@ -474,7 +474,7 @@ bool HTMLFormControlElement::checkValidi
>     // An event handler can deref this object.
>     Ref<HTMLFormControlElement> protectedThis(*this);
>     Ref<Document> originalDocument(document());
>-    auto event = Event::create(eventNames().invalidEvent, false, true);
>+    auto event = Event::create(eventNames().invalidEvent, Event::CanBubble::No, Event::IsCancelable::Yes);
>     dispatchEvent(event);
>     if (!event->defaultPrevented() && unhandledInvalidControls && isConnected() && originalDocument.ptr() == &document())
>         unhandledInvalidControls->append(this);
>Index: Source/WebCore/html/HTMLFormElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLFormElement.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLFormElement.cpp	(working copy)
>@@ -283,7 +283,7 @@ void HTMLFormElement::prepareForSubmissi
> 
>     auto protectedThis = makeRef(*this);
> 
>-    auto submitEvent = Event::create(eventNames().submitEvent, true, true);
>+    auto submitEvent = Event::create(eventNames().submitEvent, Event::CanBubble::Yes, Event::IsCancelable::Yes);
>     dispatchEvent(submitEvent);
> 
>     // Event handling could have resulted in m_shouldSubmit becoming true as a side effect, too.
>@@ -380,7 +380,7 @@ void HTMLFormElement::reset()
> 
>     SetForScope<bool> isInResetFunctionRestorer(m_isInResetFunction, true);
> 
>-    auto event = Event::create(eventNames().resetEvent, true, true);
>+    auto event = Event::create(eventNames().resetEvent, Event::CanBubble::Yes, Event::IsCancelable::Yes);
>     dispatchEvent(event);
>     if (!event->defaultPrevented())
>         resetAssociatedFormControlElements();
>Index: Source/WebCore/html/HTMLImageLoader.cpp
>===================================================================
>--- Source/WebCore/html/HTMLImageLoader.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLImageLoader.cpp	(working copy)
>@@ -58,7 +58,7 @@ void HTMLImageLoader::dispatchLoadEvent(
>     bool errorOccurred = image()->errorOccurred();
>     if (!errorOccurred && image()->response().httpStatusCode() >= 400)
>         errorOccurred = is<HTMLObjectElement>(element()); // An <object> considers a 404 to be an error and should fire onerror.
>-    element().dispatchEvent(Event::create(errorOccurred ? eventNames().errorEvent : eventNames().loadEvent, false, false));
>+    element().dispatchEvent(Event::create(errorOccurred ? eventNames().errorEvent : eventNames().loadEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> String HTMLImageLoader::sourceURI(const AtomicString& attr) const
>Index: Source/WebCore/html/HTMLInputElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLInputElement.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLInputElement.cpp	(working copy)
>@@ -1484,7 +1484,7 @@ void HTMLInputElement::onSearch()
> 
>     if (m_inputType)
>         downcast<SearchInputType>(*m_inputType.get()).stopSearchEventTimer();
>-    dispatchEvent(Event::create(eventNames().searchEvent, true, false));
>+    dispatchEvent(Event::create(eventNames().searchEvent, Event::CanBubble::Yes, Event::IsCancelable::No));
> }
> 
> void HTMLInputElement::resumeFromDocumentSuspension()
>Index: Source/WebCore/html/HTMLLinkElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLLinkElement.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLLinkElement.cpp	(working copy)
>@@ -495,9 +495,9 @@ void HTMLLinkElement::dispatchPendingEve
> {
>     ASSERT_UNUSED(eventSender, eventSender == &linkLoadEventSender() || eventSender == &linkErrorEventSender());
>     if (m_loadedResource)
>-        dispatchEvent(Event::create(eventNames().loadEvent, false, false));
>+        dispatchEvent(Event::create(eventNames().loadEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     else
>-        dispatchEvent(Event::create(eventNames().errorEvent, false, false));
>+        dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> DOMTokenList& HTMLLinkElement::relList()
>Index: Source/WebCore/html/HTMLMediaElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLMediaElement.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLMediaElement.cpp	(working copy)
>@@ -1091,7 +1091,7 @@ void HTMLMediaElement::mediaPlayerActive
> 
> void HTMLMediaElement::scheduleEvent(const AtomicString& eventName)
> {
>-    RefPtr<Event> event = Event::create(eventName, false, true);
>+    RefPtr<Event> event = Event::create(eventName, Event::CanBubble::No, Event::IsCancelable::Yes);
> 
>     // Don't set the event target, the event queue will set it in GenericEventQueue::timerFired and setting it here
>     // will trigger an ASSERT if this element has been marked for deletion.
>@@ -1137,7 +1137,7 @@ void HTMLMediaElement::notifyAboutPlayin
>     Ref<HTMLMediaElement> protectedThis(*this); // The 'playing' event can make arbitrary DOM mutations.
>     m_playbackStartedTime = currentMediaTime().toDouble();
>     m_hasEverNotifiedAboutPlaying = true;
>-    dispatchEvent(Event::create(eventNames().playingEvent, false, true));
>+    dispatchEvent(Event::create(eventNames().playingEvent, Event::CanBubble::No, Event::IsCancelable::Yes));
>     resolvePendingPlayPromises(WTFMove(pendingPlayPromises));
> 
>     schedulePlaybackControlsManagerUpdate();
>@@ -1897,19 +1897,19 @@ void HTMLMediaElement::updateActiveTextT
>         // correctly identifies the type of the event, if the startTime is
>         // less than the endTime in the cue.
>         if (eventTask.second->startTime() >= eventTask.second->endTime()) {
>-            auto enterEvent = Event::create(eventNames().enterEvent, false, false);
>+            auto enterEvent = Event::create(eventNames().enterEvent, Event::CanBubble::No, Event::IsCancelable::No);
>             enterEvent->setTarget(eventTask.second);
>             m_asyncEventQueue.enqueueEvent(WTFMove(enterEvent));
> 
>-            auto exitEvent = Event::create(eventNames().exitEvent, false, false);
>+            auto exitEvent = Event::create(eventNames().exitEvent, Event::CanBubble::No, Event::IsCancelable::No);
>             exitEvent->setTarget(eventTask.second);
>             m_asyncEventQueue.enqueueEvent(WTFMove(exitEvent));
>         } else {
>             RefPtr<Event> event;
>             if (eventTask.first == eventTask.second->startMediaTime())
>-                event = Event::create(eventNames().enterEvent, false, false);
>+                event = Event::create(eventNames().enterEvent, Event::CanBubble::No, Event::IsCancelable::No);
>             else
>-                event = Event::create(eventNames().exitEvent, false, false);
>+                event = Event::create(eventNames().exitEvent, Event::CanBubble::No, Event::IsCancelable::No);
>             event->setTarget(eventTask.second);
>             m_asyncEventQueue.enqueueEvent(WTFMove(event));
>         }
>@@ -1922,14 +1922,14 @@ void HTMLMediaElement::updateActiveTextT
>     // 15 - For each text track in affected tracks, in the list order, queue a
>     // task to fire a simple event named cuechange at the TextTrack object, and, ...
>     for (auto& affectedTrack : affectedTracks) {
>-        auto event = Event::create(eventNames().cuechangeEvent, false, false);
>+        auto event = Event::create(eventNames().cuechangeEvent, Event::CanBubble::No, Event::IsCancelable::No);
>         event->setTarget(affectedTrack);
>         m_asyncEventQueue.enqueueEvent(WTFMove(event));
> 
>         // ... if the text track has a corresponding track element, to then fire a
>         // simple event named cuechange at the track element as well.
>         if (is<LoadableTextTrack>(*affectedTrack)) {
>-            auto event = Event::create(eventNames().cuechangeEvent, false, false);
>+            auto event = Event::create(eventNames().cuechangeEvent, Event::CanBubble::No, Event::IsCancelable::No);
>             auto trackElement = makeRefPtr(downcast<LoadableTextTrack>(*affectedTrack).trackElement());
>             ASSERT(trackElement);
>             event->setTarget(trackElement);
>@@ -4395,7 +4395,7 @@ void HTMLMediaElement::layoutSizeChanged
>     if (auto frameView = makeRefPtr(document().view())) {
>         auto task = [this, protectedThis = makeRef(*this)] {
>             if (auto root = userAgentShadowRoot())
>-                root->dispatchEvent(Event::create("resize", false, false));
>+                root->dispatchEvent(Event::create("resize", Event::CanBubble::No, Event::IsCancelable::No));
>         };
>         frameView->queuePostLayoutCallback(WTFMove(task));
>     }
>Index: Source/WebCore/html/HTMLPlugInImageElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLPlugInImageElement.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLPlugInImageElement.cpp	(working copy)
>@@ -612,7 +612,7 @@ void HTMLPlugInImageElement::checkSnapsh
>     }
>     
>     // Notify the shadow root that the size changed so that we may update the overlay layout.
>-    ensureUserAgentShadowRoot().dispatchEvent(Event::create(eventNames().resizeEvent, true, false));
>+    ensureUserAgentShadowRoot().dispatchEvent(Event::create(eventNames().resizeEvent, Event::CanBubble::Yes, Event::IsCancelable::No));
> }
>     
> void HTMLPlugInImageElement::subframeLoaderWillCreatePlugIn(const URL& url)
>Index: Source/WebCore/html/HTMLScriptElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLScriptElement.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLScriptElement.cpp	(working copy)
>@@ -176,7 +176,7 @@ void HTMLScriptElement::dispatchLoadEven
>     ASSERT(!haveFiredLoadEvent());
>     setHaveFiredLoadEvent(true);
> 
>-    dispatchEvent(Event::create(eventNames().loadEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().loadEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> Ref<Element> HTMLScriptElement::cloneElementWithoutAttributesAndChildren(Document& targetDocument)
>Index: Source/WebCore/html/HTMLSlotElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLSlotElement.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLSlotElement.cpp	(working copy)
>@@ -142,9 +142,7 @@ void HTMLSlotElement::dispatchSlotChange
> {
>     m_inSignalSlotList = false;
> 
>-    bool bubbles = true;
>-    bool cancelable = false;
>-    Ref<Event> event = Event::create(eventNames().slotchangeEvent, bubbles, cancelable);
>+    Ref<Event> event = Event::create(eventNames().slotchangeEvent, Event::CanBubble::Yes, Event::IsCancelable::No);
>     event->setTarget(this);
>     dispatchEvent(event);
> }
>Index: Source/WebCore/html/HTMLSourceElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLSourceElement.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLSourceElement.cpp	(working copy)
>@@ -115,7 +115,7 @@ void HTMLSourceElement::cancelPendingErr
> void HTMLSourceElement::errorEventTimerFired()
> {
>     LOG(Media, "HTMLSourceElement::errorEventTimerFired - %p", this);
>-    dispatchEvent(Event::create(eventNames().errorEvent, false, true));
>+    dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::Yes));
> }
> 
> bool HTMLSourceElement::isURLAttribute(const Attribute& attribute) const
>Index: Source/WebCore/html/HTMLStyleElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLStyleElement.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLStyleElement.cpp	(working copy)
>@@ -130,9 +130,9 @@ void HTMLStyleElement::dispatchPendingEv
> {
>     ASSERT_UNUSED(eventSender, eventSender == &styleLoadEventSender());
>     if (m_loadedSheet)
>-        dispatchEvent(Event::create(eventNames().loadEvent, false, false));
>+        dispatchEvent(Event::create(eventNames().loadEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     else
>-        dispatchEvent(Event::create(eventNames().errorEvent, false, false));
>+        dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void HTMLStyleElement::notifyLoadedSheetAndAllCriticalSubresources(bool errorOccurred)
>Index: Source/WebCore/html/HTMLTextFormControlElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLTextFormControlElement.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLTextFormControlElement.cpp	(working copy)
>@@ -490,7 +490,7 @@ void HTMLTextFormControlElement::selecti
>     cacheSelection(computeSelectionStart(), computeSelectionEnd(), computeSelectionDirection());
>     
>     if (shouldFireSelectEvent && m_cachedSelectionStart != m_cachedSelectionEnd)
>-        dispatchEvent(Event::create(eventNames().selectEvent, true, false));
>+        dispatchEvent(Event::create(eventNames().selectEvent, Event::CanBubble::Yes, Event::IsCancelable::No));
> }
> 
> void HTMLTextFormControlElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
>Index: Source/WebCore/html/HTMLTrackElement.cpp
>===================================================================
>--- Source/WebCore/html/HTMLTrackElement.cpp	(revision 234910)
>+++ Source/WebCore/html/HTMLTrackElement.cpp	(working copy)
>@@ -247,7 +247,7 @@ void HTMLTrackElement::didCompleteLoad(L
> 
>     if (status == Failure) {
>         setReadyState(HTMLTrackElement::TRACK_ERROR);
>-        dispatchEvent(Event::create(eventNames().errorEvent, false, false));
>+        dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
>         return;
>     }
> 
>@@ -258,7 +258,7 @@ void HTMLTrackElement::didCompleteLoad(L
> 
>     //     2. If the file was successfully processed, fire a simple event named load at the 
>     //        track element.
>-    dispatchEvent(Event::create(eventNames().loadEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().loadEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> // NOTE: The values in the TextTrack::ReadinessState enum must stay in sync with those in HTMLTrackElement::ReadyState.
>Index: Source/WebCore/html/MediaController.cpp
>===================================================================
>--- Source/WebCore/html/MediaController.cpp	(revision 234910)
>+++ Source/WebCore/html/MediaController.cpp	(working copy)
>@@ -532,7 +532,7 @@ bool MediaController::hasEnded() const
> 
> void MediaController::scheduleEvent(const AtomicString& eventName)
> {
>-    m_pendingEvents.append(Event::create(eventName, false, true));
>+    m_pendingEvents.append(Event::create(eventName, Event::CanBubble::No, Event::IsCancelable::Yes));
>     if (!m_asyncEventTimer.isActive())
>         m_asyncEventTimer.startOneShot(0_s);
> }
>Index: Source/WebCore/html/canvas/WebGLContextEvent.cpp
>===================================================================
>--- Source/WebCore/html/canvas/WebGLContextEvent.cpp	(revision 234910)
>+++ Source/WebCore/html/canvas/WebGLContextEvent.cpp	(working copy)
>@@ -30,7 +30,7 @@
> 
> namespace WebCore {
> 
>-WebGLContextEvent::WebGLContextEvent(const AtomicString& type, bool canBubble, bool cancelable, const String& statusMessage)
>+WebGLContextEvent::WebGLContextEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, const String& statusMessage)
>     : Event(type, canBubble, cancelable)
>     , m_statusMessage(statusMessage)
> {
>Index: Source/WebCore/html/canvas/WebGLContextEvent.h
>===================================================================
>--- Source/WebCore/html/canvas/WebGLContextEvent.h	(revision 234910)
>+++ Source/WebCore/html/canvas/WebGLContextEvent.h	(working copy)
>@@ -31,7 +31,7 @@ namespace WebCore {
> 
> class WebGLContextEvent final : public Event {
> public:
>-    static Ref<WebGLContextEvent> create(const AtomicString& type, bool canBubble, bool cancelable, const String& statusMessage)
>+    static Ref<WebGLContextEvent> create(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, const String& statusMessage)
>     {
>         return adoptRef(*new WebGLContextEvent(type, canBubble, cancelable, statusMessage));
>     }
>@@ -51,7 +51,7 @@ public:
>     EventInterface eventInterface() const override;
> 
> private:
>-    WebGLContextEvent(const AtomicString& type, bool canBubble, bool cancelable, const String& statusMessage);
>+    WebGLContextEvent(const AtomicString& type, CanBubble, IsCancelable, const String& statusMessage);
>     WebGLContextEvent(const AtomicString&, const Init&, IsTrusted);
> 
>     String m_statusMessage;
>Index: Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp
>===================================================================
>--- Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp	(revision 234910)
>+++ Source/WebCore/html/canvas/WebGLRenderingContextBase.cpp	(working copy)
>@@ -538,7 +538,8 @@ std::unique_ptr<WebGLRenderingContextBas
>         // The FrameLoaderClient might block creation of a new WebGL context despite the page settings; in
>         // particular, if WebGL contexts were lost one or more times via the GL_ARB_robustness extension.
>         if (!frame->loader().client().allowWebGL(frame->settings().webGLEnabled())) {
>-            canvasElement->dispatchEvent(WebGLContextEvent::create(eventNames().webglcontextcreationerrorEvent, false, true, "Web page was not allowed to create a WebGL context."));
>+            canvasElement->dispatchEvent(WebGLContextEvent::create(eventNames().webglcontextcreationerrorEvent,
>+                Event::CanBubble::No, Event::IsCancelable::Yes, "Web page was not allowed to create a WebGL context."));
>             return nullptr;
>         }
> 
>@@ -601,8 +602,10 @@ std::unique_ptr<WebGLRenderingContextBas
> 
>     auto context = GraphicsContext3D::create(attributes, hostWindow);
>     if (!context || !context->makeContextCurrent()) {
>-        if (canvasElement)
>-            canvasElement->dispatchEvent(WebGLContextEvent::create(eventNames().webglcontextcreationerrorEvent, false, true, "Could not create a WebGL context."));
>+        if (canvasElement) {
>+            canvasElement->dispatchEvent(WebGLContextEvent::create(eventNames().webglcontextcreationerrorEvent,
>+                Event::CanBubble::No, Event::IsCancelable::Yes, "Could not create a WebGL context."));
>+        }
>         return nullptr;
>     }
> 
>@@ -6017,7 +6020,7 @@ void WebGLRenderingContextBase::dispatch
>     if (!canvas)
>         return;
> 
>-    Ref<WebGLContextEvent> event = WebGLContextEvent::create(eventNames().webglcontextlostEvent, false, true, emptyString());
>+    Ref<WebGLContextEvent> event = WebGLContextEvent::create(eventNames().webglcontextlostEvent, Event::CanBubble::No, Event::IsCancelable::Yes, emptyString());
>     canvas->dispatchEvent(event);
>     m_restoreAllowed = event->defaultPrevented();
>     if (m_contextLostMode == RealLostContext && m_restoreAllowed)
>@@ -6103,7 +6106,7 @@ void WebGLRenderingContextBase::maybeRes
>     setupFlags();
>     initializeNewContext();
>     initializeVertexArrayObjects();
>-    canvas->dispatchEvent(WebGLContextEvent::create(eventNames().webglcontextrestoredEvent, false, true, emptyString()));
>+    canvas->dispatchEvent(WebGLContextEvent::create(eventNames().webglcontextrestoredEvent, Event::CanBubble::No, Event::IsCancelable::Yes, emptyString()));
> }
> 
> void WebGLRenderingContextBase::dispatchContextChangedEvent()
>@@ -6112,7 +6115,7 @@ void WebGLRenderingContextBase::dispatch
>     if (!canvas)
>         return;
> 
>-    canvas->dispatchEvent(WebGLContextEvent::create(eventNames().webglcontextchangedEvent, false, true, emptyString()));
>+    canvas->dispatchEvent(WebGLContextEvent::create(eventNames().webglcontextchangedEvent, Event::CanBubble::No, Event::IsCancelable::Yes, emptyString()));
> }
> 
> void WebGLRenderingContextBase::simulateContextChanged()
>Index: Source/WebCore/html/parser/HTMLScriptRunner.cpp
>===================================================================
>--- Source/WebCore/html/parser/HTMLScriptRunner.cpp	(revision 234910)
>+++ Source/WebCore/html/parser/HTMLScriptRunner.cpp	(working copy)
>@@ -85,7 +85,7 @@ static URL documentURLForScriptExecution
> 
> inline Ref<Event> createScriptLoadEvent()
> {
>-    return Event::create(eventNames().loadEvent, false, false);
>+    return Event::create(eventNames().loadEvent, Event::CanBubble::No, Event::IsCancelable::No);
> }
> 
> bool HTMLScriptRunner::isPendingScriptReady(const PendingScript& script)
>Index: Source/WebCore/html/track/TrackEvent.cpp
>===================================================================
>--- Source/WebCore/html/track/TrackEvent.cpp	(revision 234910)
>+++ Source/WebCore/html/track/TrackEvent.cpp	(working copy)
>@@ -48,7 +48,7 @@ static inline std::optional<TrackEvent::
>     return std::nullopt;
> }
> 
>-TrackEvent::TrackEvent(const AtomicString& type, bool canBubble, bool cancelable, Ref<TrackBase>&& track)
>+TrackEvent::TrackEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, Ref<TrackBase>&& track)
>     : Event(type, canBubble, cancelable)
>     , m_track(convertToTrackEventTrack(WTFMove(track)))
> {
>Index: Source/WebCore/html/track/TrackEvent.h
>===================================================================
>--- Source/WebCore/html/track/TrackEvent.h	(revision 234910)
>+++ Source/WebCore/html/track/TrackEvent.h	(working copy)
>@@ -38,7 +38,7 @@ class TrackEvent final : public Event {
> public:
>     virtual ~TrackEvent();
> 
>-    static Ref<TrackEvent> create(const AtomicString& type, bool canBubble, bool cancelable, Ref<TrackBase>&& track)
>+    static Ref<TrackEvent> create(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable, Ref<TrackBase>&& track)
>     {
>         return adoptRef(*new TrackEvent(type, canBubble, cancelable, WTFMove(track)));
>     }
>@@ -57,7 +57,7 @@ public:
>     std::optional<TrackEventTrack> track() const { return m_track; }
> 
> private:
>-    TrackEvent(const AtomicString& type, bool canBubble, bool cancelable, Ref<TrackBase>&&);
>+    TrackEvent(const AtomicString& type, CanBubble, IsCancelable, Ref<TrackBase>&&);
>     TrackEvent(const AtomicString& type, Init&& initializer, IsTrusted);
> 
>     EventInterface eventInterface() const override;
>Index: Source/WebCore/html/track/TrackListBase.cpp
>===================================================================
>--- Source/WebCore/html/track/TrackListBase.cpp	(revision 234910)
>+++ Source/WebCore/html/track/TrackListBase.cpp	(working copy)
>@@ -95,7 +95,7 @@ bool TrackListBase::contains(TrackBase& 
> 
> void TrackListBase::scheduleTrackEvent(const AtomicString& eventName, Ref<TrackBase>&& track)
> {
>-    m_asyncEventQueue.enqueueEvent(TrackEvent::create(eventName, false, false, WTFMove(track)));
>+    m_asyncEventQueue.enqueueEvent(TrackEvent::create(eventName, Event::CanBubble::No, Event::IsCancelable::No, WTFMove(track)));
> }
> 
> void TrackListBase::scheduleAddTrackEvent(Ref<TrackBase>&& track)
>@@ -158,7 +158,7 @@ void TrackListBase::scheduleChangeEvent(
>     // Whenever a track in a VideoTrackList that was previously not selected is
>     // selected, the user agent must queue a task to fire a simple event named
>     // change at the VideoTrackList object.
>-    m_asyncEventQueue.enqueueEvent(Event::create(eventNames().changeEvent, false, false));
>+    m_asyncEventQueue.enqueueEvent(Event::create(eventNames().changeEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> bool TrackListBase::isChangeEventScheduled() const
>Index: Source/WebCore/loader/DocumentLoader.cpp
>===================================================================
>--- Source/WebCore/loader/DocumentLoader.cpp	(revision 234910)
>+++ Source/WebCore/loader/DocumentLoader.cpp	(working copy)
>@@ -731,7 +731,7 @@ void DocumentLoader::stopLoadingAfterXFr
>     InspectorInstrumentation::continueAfterXFrameOptionsDenied(*m_frame, identifier, *this, response);
>     m_frame->document()->enforceSandboxFlags(SandboxOrigin);
>     if (HTMLFrameOwnerElement* ownerElement = m_frame->ownerElement())
>-        ownerElement->dispatchEvent(Event::create(eventNames().loadEvent, false, false));
>+        ownerElement->dispatchEvent(Event::create(eventNames().loadEvent, Event::CanBubble::No, Event::IsCancelable::No));
> 
>     // The load event might have detached this frame. In that case, the load will already have been cancelled during detach.
>     if (FrameLoader* frameLoader = this->frameLoader())
>Index: Source/WebCore/loader/FrameLoader.cpp
>===================================================================
>--- Source/WebCore/loader/FrameLoader.cpp	(revision 234910)
>+++ Source/WebCore/loader/FrameLoader.cpp	(working copy)
>@@ -3155,7 +3155,7 @@ void FrameLoader::dispatchUnloadEvents(U
>             // https://bugs.webkit.org/show_bug.cgi?id=116770
> 
>             if (m_frame.document()->pageCacheState() == Document::NotInPageCache) {
>-                Ref<Event> unloadEvent(Event::create(eventNames().unloadEvent, false, false));
>+                Ref<Event> unloadEvent(Event::create(eventNames().unloadEvent, Event::CanBubble::No, Event::IsCancelable::No));
>                 // The DocumentLoader (and thus its LoadTiming) might get destroyed
>                 // while dispatching the event, so protect it to prevent writing the end
>                 // time into freed memory.
>Index: Source/WebCore/loader/ImageLoader.cpp
>===================================================================
>--- Source/WebCore/loader/ImageLoader.cpp	(revision 234910)
>+++ Source/WebCore/loader/ImageLoader.cpp	(working copy)
>@@ -505,7 +505,7 @@ void ImageLoader::dispatchPendingErrorEv
>         return;
>     m_hasPendingErrorEvent = false;
>     if (element().document().hasLivingRenderTree())
>-        element().dispatchEvent(Event::create(eventNames().errorEvent, false, false));
>+        element().dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
> 
>     // Only consider updating the protection ref-count of the Element immediately before returning
>     // from this function as doing so might result in the destruction of this ImageLoader.
>Index: Source/WebCore/loader/PolicyChecker.cpp
>===================================================================
>--- Source/WebCore/loader/PolicyChecker.cpp	(revision 234910)
>+++ Source/WebCore/loader/PolicyChecker.cpp	(working copy)
>@@ -132,7 +132,7 @@ void PolicyChecker::checkNavigationPolic
>         if (m_frame.ownerElement()) {
>             // Fire a load event (even though we were blocked by CSP) as timing attacks would otherwise
>             // reveal that the frame was blocked. This way, it looks like any other cross-origin page load.
>-            m_frame.ownerElement()->dispatchEvent(Event::create(eventNames().loadEvent, false, false));
>+            m_frame.ownerElement()->dispatchEvent(Event::create(eventNames().loadEvent, Event::CanBubble::No, Event::IsCancelable::No));
>         }
>         function(WTFMove(request), { }, ShouldContinue::No);
>         return;
>Index: Source/WebCore/loader/appcache/ApplicationCacheHost.cpp
>===================================================================
>--- Source/WebCore/loader/appcache/ApplicationCacheHost.cpp	(revision 234910)
>+++ Source/WebCore/loader/appcache/ApplicationCacheHost.cpp	(working copy)
>@@ -374,7 +374,7 @@ static Ref<Event> createApplicationCache
> {
>     if (eventType == eventNames().progressEvent)
>         return ProgressEvent::create(eventType, true, done, total);
>-    return Event::create(eventType, false, false);
>+    return Event::create(eventType, Event::CanBubble::No, Event::IsCancelable::No);
> }
> 
> void ApplicationCacheHost::dispatchDOMEvent(const AtomicString& eventType, int total, int done)
>Index: Source/WebCore/page/DOMWindow.cpp
>===================================================================
>--- Source/WebCore/page/DOMWindow.cpp	(revision 234910)
>+++ Source/WebCore/page/DOMWindow.cpp	(working copy)
>@@ -307,7 +307,7 @@ void DOMWindow::dispatchAllPendingUnload
>             continue;
> 
>         window->dispatchEvent(PageTransitionEvent::create(eventNames().pagehideEvent, false), window->document());
>-        window->dispatchEvent(Event::create(eventNames().unloadEvent, false, false), window->document());
>+        window->dispatchEvent(Event::create(eventNames().unloadEvent, Event::CanBubble::No, Event::IsCancelable::No), window->document());
> 
>         window->enableSuddenTermination();
>     }
>@@ -1991,7 +1991,7 @@ bool DOMWindow::removeEventListener(cons
> void DOMWindow::languagesChanged()
> {
>     if (auto* document = this->document())
>-        document->enqueueWindowEvent(Event::create(eventNames().languagechangeEvent, false, false));
>+        document->enqueueWindowEvent(Event::create(eventNames().languagechangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void DOMWindow::dispatchLoadEvent()
>@@ -2005,7 +2005,7 @@ void DOMWindow::dispatchLoadEvent()
>     if (shouldMarkLoadEventTimes)
>         protectedLoader->timing().markLoadEventStart();
> 
>-    dispatchEvent(Event::create(eventNames().loadEvent, false, false), document());
>+    dispatchEvent(Event::create(eventNames().loadEvent, Event::CanBubble::No, Event::IsCancelable::No), document());
> 
>     if (shouldMarkLoadEventTimes)
>         protectedLoader->timing().markLoadEventEnd();
>@@ -2013,7 +2013,7 @@ void DOMWindow::dispatchLoadEvent()
>     // Send a separate load event to the element that owns this frame.
>     if (frame()) {
>         if (auto* owner = frame()->ownerElement())
>-            owner->dispatchEvent(Event::create(eventNames().loadEvent, false, false));
>+            owner->dispatchEvent(Event::create(eventNames().loadEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     }
> 
>     InspectorInstrumentation::loadEventFired(frame());
>Index: Source/WebCore/page/EventHandler.cpp
>===================================================================
>--- Source/WebCore/page/EventHandler.cpp	(revision 234910)
>+++ Source/WebCore/page/EventHandler.cpp	(working copy)
>@@ -472,7 +472,7 @@ static inline bool dispatchSelectStart(N
>     if (!node || !node->renderer())
>         return true;
> 
>-    auto event = Event::create(eventNames().selectstartEvent, true, true);
>+    auto event = Event::create(eventNames().selectstartEvent, Event::CanBubble::Yes, Event::IsCancelable::Yes);
>     node->dispatchEvent(event);
>     return !event->defaultPrevented();
> }
>@@ -2213,7 +2213,7 @@ bool EventHandler::dispatchDragEvent(con
> 
>     view->disableLayerFlushThrottlingTemporarilyForInteraction();
>     Ref<MouseEvent> me = MouseEvent::create(eventType,
>-        true, true, event.timestamp().approximateMonotonicTime(), &m_frame.windowProxy(),
>+        Event::CanBubble::Yes, Event::IsCancelable::Yes, event.timestamp().approximateMonotonicTime(), &m_frame.windowProxy(),
>         0, event.globalPosition().x(), event.globalPosition().y(), event.position().x(), event.position().y(),
> #if ENABLE(POINTER_LOCK)
>         event.movementDelta().x(), event.movementDelta().y(),
>Index: Source/WebCore/page/EventSource.cpp
>===================================================================
>--- Source/WebCore/page/EventSource.cpp	(revision 234910)
>+++ Source/WebCore/page/EventSource.cpp	(working copy)
>@@ -140,7 +140,7 @@ void EventSource::scheduleReconnect()
> {
>     m_state = CONNECTING;
>     m_connectTimer.startOneShot(1_ms * m_reconnectDelay);
>-    dispatchEvent(Event::create(eventNames().errorEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void EventSource::close()
>@@ -196,13 +196,13 @@ void EventSource::didReceiveResponse(uns
> 
>     if (!responseIsValid(response)) {
>         m_loader->cancel();
>-        dispatchEvent(Event::create(eventNames().errorEvent, false, false));
>+        dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
>         return;
>     }
> 
>     m_eventStreamOrigin = SecurityOriginData::fromURL(response.url()).toString();
>     m_state = OPEN;
>-    dispatchEvent(Event::create(eventNames().openEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().openEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void EventSource::didReceiveData(const char* data, int length)
>@@ -264,7 +264,7 @@ void EventSource::abortConnectionAttempt
>     }
> 
>     ASSERT(m_state == CLOSED);
>-    dispatchEvent(Event::create(eventNames().errorEvent, false, false));
>+    dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> void EventSource::parseEventStream()
>Index: Source/WebCore/page/FocusController.cpp
>===================================================================
>--- Source/WebCore/page/FocusController.cpp	(revision 234910)
>+++ Source/WebCore/page/FocusController.cpp	(working copy)
>@@ -278,7 +278,7 @@ static inline void dispatchEventsOnWindo
> 
>     if (!focused && document->focusedElement())
>         document->focusedElement()->dispatchBlurEvent(nullptr);
>-    document->dispatchWindowEvent(Event::create(focused ? eventNames().focusEvent : eventNames().blurEvent, false, false));
>+    document->dispatchWindowEvent(Event::create(focused ? eventNames().focusEvent : eventNames().blurEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     if (focused && document->focusedElement())
>         document->focusedElement()->dispatchFocusEvent(nullptr, FocusDirectionNone);
> }
>@@ -331,12 +331,12 @@ void FocusController::setFocusedFrame(Fr
>     // Now that the frame is updated, fire events and update the selection focused states of both frames.
>     if (oldFrame && oldFrame->view()) {
>         oldFrame->selection().setFocused(false);
>-        oldFrame->document()->dispatchWindowEvent(Event::create(eventNames().blurEvent, false, false));
>+        oldFrame->document()->dispatchWindowEvent(Event::create(eventNames().blurEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     }
> 
>     if (newFrame && newFrame->view() && isFocused()) {
>         newFrame->selection().setFocused(true);
>-        newFrame->document()->dispatchWindowEvent(Event::create(eventNames().focusEvent, false, false));
>+        newFrame->document()->dispatchWindowEvent(Event::create(eventNames().focusEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     }
> 
>     m_page.chrome().focusedFrameChanged(newFrame.get());
>Index: Source/WebCore/page/FrameView.cpp
>===================================================================
>--- Source/WebCore/page/FrameView.cpp	(revision 234910)
>+++ Source/WebCore/page/FrameView.cpp	(working copy)
>@@ -3323,7 +3323,7 @@ void FrameView::sendResizeEventIfNeeded(
> 
>     LOG(Events, "FrameView %p sendResizeEventIfNeeded sending resize event, size %dx%d (canSendResizeEventSynchronously %d)", this, currentSize.width(), currentSize.height(), canSendResizeEventSynchronously);
> 
>-    Ref<Event> resizeEvent = Event::create(eventNames().resizeEvent, false, false);
>+    Ref<Event> resizeEvent = Event::create(eventNames().resizeEvent, Event::CanBubble::No, Event::IsCancelable::No);
>     if (canSendResizeEventSynchronously)
>         frame().document()->dispatchWindowEvent(resizeEvent);
>     else {
>Index: Source/WebCore/page/Page.cpp
>===================================================================
>--- Source/WebCore/page/Page.cpp	(revision 234910)
>+++ Source/WebCore/page/Page.cpp	(working copy)
>@@ -188,7 +188,7 @@ static void networkStateChanged(bool isO
>     for (auto& frame : frames) {
>         if (!frame->document())
>             continue;
>-        frame->document()->dispatchWindowEvent(Event::create(eventName, false, false));
>+        frame->document()->dispatchWindowEvent(Event::create(eventName, Event::CanBubble::No, Event::IsCancelable::No));
>     }
> }
> 
>Index: Source/WebCore/page/Performance.cpp
>===================================================================
>--- Source/WebCore/page/Performance.cpp	(revision 234910)
>+++ Source/WebCore/page/Performance.cpp	(working copy)
>@@ -215,7 +215,7 @@ void Performance::resourceTimingBufferFu
>         ASSERT(m_backupResourceTimingBuffer.isEmpty());
> 
>         m_resourceTimingBufferFullFlag = true;
>-        dispatchEvent(Event::create(eventNames().resourcetimingbufferfullEvent, true, false));
>+        dispatchEvent(Event::create(eventNames().resourcetimingbufferfullEvent, Event::CanBubble::Yes, Event::IsCancelable::No));
> 
>         if (m_resourceTimingBufferFullFlag) {
>             for (auto& entry : backupBuffer)
>Index: Source/WebCore/page/PointerLockController.cpp
>===================================================================
>--- Source/WebCore/page/PointerLockController.cpp	(revision 234910)
>+++ Source/WebCore/page/PointerLockController.cpp	(working copy)
>@@ -207,7 +207,7 @@ void PointerLockController::enqueueEvent
> void PointerLockController::enqueueEvent(const AtomicString& type, Document* document)
> {
>     if (document)
>-        document->enqueueDocumentEvent(Event::create(type, true, false));
>+        document->enqueueDocumentEvent(Event::create(type, Event::CanBubble::Yes, Event::IsCancelable::No));
> }
> 
> } // namespace WebCore
>Index: Source/WebCore/page/VisualViewport.cpp
>===================================================================
>--- Source/WebCore/page/VisualViewport.cpp	(revision 234910)
>+++ Source/WebCore/page/VisualViewport.cpp	(working copy)
>@@ -180,9 +180,7 @@ void VisualViewport::enqueueResizeEvent(
>     if (!m_frame)
>         return;
> 
>-    bool bubbles = false;
>-    bool cancelable = false;
>-    m_frame->document()->eventQueue().enqueueResizeEvent(*this, bubbles, cancelable);
>+    m_frame->document()->eventQueue().enqueueResizeEvent(*this, Event::CanBubble::No, Event::IsCancelable::No);
> }
> 
> void VisualViewport::enqueueScrollEvent()
>@@ -190,9 +188,7 @@ void VisualViewport::enqueueScrollEvent(
>     if (!m_frame)
>         return;
> 
>-    bool bubbles = false;
>-    bool cancelable = false;
>-    m_frame->document()->eventQueue().enqueueScrollEvent(*this, bubbles, cancelable);
>+    m_frame->document()->eventQueue().enqueueScrollEvent(*this, Event::CanBubble::No, Event::IsCancelable::No);
> }
> 
> } // namespace WebCore
>Index: Source/WebCore/storage/StorageEvent.cpp
>===================================================================
>--- Source/WebCore/storage/StorageEvent.cpp	(revision 234910)
>+++ Source/WebCore/storage/StorageEvent.cpp	(working copy)
>@@ -50,7 +50,7 @@ Ref<StorageEvent> StorageEvent::create(c
> }
> 
> StorageEvent::StorageEvent(const AtomicString& type, const String& key, const String& oldValue, const String& newValue, const String& url, Storage* storageArea)
>-    : Event(type, false, false)
>+    : Event(type, CanBubble::No, IsCancelable::No)
>     , m_key(key)
>     , m_oldValue(oldValue)
>     , m_newValue(newValue)
>Index: Source/WebCore/svg/SVGElement.cpp
>===================================================================
>--- Source/WebCore/svg/SVGElement.cpp	(revision 234910)
>+++ Source/WebCore/svg/SVGElement.cpp	(working copy)
>@@ -603,7 +603,7 @@ void SVGElement::sendSVGLoadEventIfPossi
>         if (sendParentLoadEvents)
>             parent = currentTarget->parentOrShadowHostElement(); // save the next parent to dispatch too incase dispatching the event changes the tree
>         if (hasLoadListener(currentTarget.get()))
>-            currentTarget->dispatchEvent(Event::create(eventNames().loadEvent, false, false));
>+            currentTarget->dispatchEvent(Event::create(eventNames().loadEvent, Event::CanBubble::No, Event::IsCancelable::No));
>         currentTarget = (parent && parent->isSVGElement()) ? static_pointer_cast<SVGElement>(parent) : RefPtr<SVGElement>();
>         SVGElement* element = currentTarget.get();
>         if (!element || !element->isOutermostSVGSVGElement())
>Index: Source/WebCore/svg/SVGImageLoader.cpp
>===================================================================
>--- Source/WebCore/svg/SVGImageLoader.cpp	(revision 234910)
>+++ Source/WebCore/svg/SVGImageLoader.cpp	(working copy)
>@@ -39,7 +39,7 @@ SVGImageLoader::~SVGImageLoader() = defa
> void SVGImageLoader::dispatchLoadEvent()
> {
>     if (image()->errorOccurred())
>-        element().dispatchEvent(Event::create(eventNames().errorEvent, false, false));
>+        element().dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     else {
>         if (downcast<SVGImageElement>(element()).externalResourcesRequired())
>             downcast<SVGImageElement>(ImageLoader::element()).sendSVGLoadEventIfPossible(true);
>Index: Source/WebCore/svg/SVGUseElement.cpp
>===================================================================
>--- Source/WebCore/svg/SVGUseElement.cpp	(revision 234910)
>+++ Source/WebCore/svg/SVGUseElement.cpp	(working copy)
>@@ -559,7 +559,7 @@ void SVGUseElement::notifyFinished(Cache
>     ASSERT(ScriptDisallowedScope::InMainThread::isScriptAllowed());
>     invalidateShadowTree();
>     if (resource.errorOccurred())
>-        dispatchEvent(Event::create(eventNames().errorEvent, false, false));
>+        dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     else if (!resource.wasCanceled())
>         SVGExternalResourcesRequired::dispatchLoadEvent();
> }
>Index: Source/WebCore/svg/animation/SVGSMILElement.cpp
>===================================================================
>--- Source/WebCore/svg/animation/SVGSMILElement.cpp	(revision 234910)
>+++ Source/WebCore/svg/animation/SVGSMILElement.cpp	(working copy)
>@@ -1222,7 +1222,7 @@ void SVGSMILElement::dispatchPendingEven
> {
>     ASSERT(eventSender == &smilBeginEventSender() || eventSender == &smilEndEventSender());
>     const AtomicString& eventType = eventSender->eventType();
>-    dispatchEvent(Event::create(eventType, false, false));
>+    dispatchEvent(Event::create(eventType, Event::CanBubble::No, Event::IsCancelable::No));
> }
> 
> }
>Index: Source/WebCore/workers/Worker.cpp
>===================================================================
>--- Source/WebCore/workers/Worker.cpp	(revision 234910)
>+++ Source/WebCore/workers/Worker.cpp	(working copy)
>@@ -181,7 +181,7 @@ void Worker::notifyFinished()
>     PAL::SessionID sessionID = context ? context->sessionID() : PAL::SessionID();
> 
>     if (m_scriptLoader->failed() || !sessionID.isValid())
>-        dispatchEvent(Event::create(eventNames().errorEvent, false, true));
>+        dispatchEvent(Event::create(eventNames().errorEvent, Event::CanBubble::No, Event::IsCancelable::Yes));
>     else {
>         bool isOnline = platformStrategies()->loaderStrategy()->isOnLine();
>         const ContentSecurityPolicyResponseHeaders& contentSecurityPolicyResponseHeaders = m_contentSecurityPolicyResponseHeaders ? m_contentSecurityPolicyResponseHeaders.value() : scriptExecutionContext()->contentSecurityPolicy()->responseHeaders();
>Index: Source/WebCore/workers/WorkerMessagingProxy.cpp
>===================================================================
>--- Source/WebCore/workers/WorkerMessagingProxy.cpp	(revision 234910)
>+++ Source/WebCore/workers/WorkerMessagingProxy.cpp	(working copy)
>@@ -227,7 +227,7 @@ void WorkerMessagingProxy::notifyNetwork
>     m_workerThread->runLoop().postTask([isOnline] (ScriptExecutionContext& context) {
>         auto& globalScope = downcast<WorkerGlobalScope>(context);
>         globalScope.setIsOnline(isOnline);
>-        globalScope.dispatchEvent(Event::create(isOnline ? eventNames().onlineEvent : eventNames().offlineEvent, false, false));
>+        globalScope.dispatchEvent(Event::create(isOnline ? eventNames().onlineEvent : eventNames().offlineEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     });
> }
> 
>Index: Source/WebCore/workers/service/ExtendableEvent.cpp
>===================================================================
>--- Source/WebCore/workers/service/ExtendableEvent.cpp	(revision 234910)
>+++ Source/WebCore/workers/service/ExtendableEvent.cpp	(working copy)
>@@ -39,8 +39,8 @@ ExtendableEvent::ExtendableEvent(const A
> {
> }
> 
>-ExtendableEvent::ExtendableEvent(const AtomicString& type, bool bubbles, bool cancelable)
>-    : Event(type, bubbles, cancelable)
>+ExtendableEvent::ExtendableEvent(const AtomicString& type, CanBubble canBubble, IsCancelable cancelable)
>+    : Event(type, canBubble, cancelable)
> {
> }
> 
>Index: Source/WebCore/workers/service/ExtendableEvent.h
>===================================================================
>--- Source/WebCore/workers/service/ExtendableEvent.h	(revision 234910)
>+++ Source/WebCore/workers/service/ExtendableEvent.h	(working copy)
>@@ -53,7 +53,7 @@ public:
> 
> protected:
>     WEBCORE_EXPORT ExtendableEvent(const AtomicString&, const ExtendableEventInit&, IsTrusted);
>-    ExtendableEvent(const AtomicString&, bool bubbles, bool cancelable);
>+    ExtendableEvent(const AtomicString&, CanBubble, IsCancelable);
> 
>     void addExtendLifetimePromise(Ref<DOMPromise>&&);
> 
>Index: Source/WebCore/workers/service/ExtendableMessageEvent.cpp
>===================================================================
>--- Source/WebCore/workers/service/ExtendableMessageEvent.cpp	(revision 234910)
>+++ Source/WebCore/workers/service/ExtendableMessageEvent.cpp	(working copy)
>@@ -48,7 +48,7 @@ ExtendableMessageEvent::ExtendableMessag
> }
> 
> ExtendableMessageEvent::ExtendableMessageEvent(RefPtr<SerializedScriptValue>&& data, const String& origin, const String& lastEventId, std::optional<ExtendableMessageEventSource>&& source, Vector<RefPtr<MessagePort>>&& ports)
>-    : ExtendableEvent(eventNames().messageEvent, false, false)
>+    : ExtendableEvent(eventNames().messageEvent, CanBubble::No, IsCancelable::No)
>     , m_data(WTFMove(data))
>     , m_origin(origin)
>     , m_lastEventId(lastEventId)
>Index: Source/WebCore/workers/service/ServiceWorker.cpp
>===================================================================
>--- Source/WebCore/workers/service/ServiceWorker.cpp	(revision 234910)
>+++ Source/WebCore/workers/service/ServiceWorker.cpp	(working copy)
>@@ -86,7 +86,7 @@ void ServiceWorker::scheduleTaskToUpdate
>         m_data.state = state;
>         if (state != State::Installing && !m_isStopped) {
>             ASSERT(m_pendingActivityForEventDispatch);
>-            dispatchEvent(Event::create(eventNames().statechangeEvent, false, false));
>+            dispatchEvent(Event::create(eventNames().statechangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
>         }
> 
>         updatePendingActivityForEventDispatch();
>Index: Source/WebCore/workers/service/ServiceWorkerContainer.cpp
>===================================================================
>--- Source/WebCore/workers/service/ServiceWorkerContainer.cpp	(revision 234910)
>+++ Source/WebCore/workers/service/ServiceWorkerContainer.cpp	(working copy)
>@@ -611,7 +611,7 @@ void ServiceWorkerContainer::scheduleTas
>         if (m_isStopped)
>             return;
> 
>-        dispatchEvent(Event::create(eventNames().controllerchangeEvent, false, false));
>+        dispatchEvent(Event::create(eventNames().controllerchangeEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     });
> }
> 
>Index: Source/WebCore/workers/service/ServiceWorkerRegistration.cpp
>===================================================================
>--- Source/WebCore/workers/service/ServiceWorkerRegistration.cpp	(revision 234910)
>+++ Source/WebCore/workers/service/ServiceWorkerRegistration.cpp	(working copy)
>@@ -215,7 +215,7 @@ void ServiceWorkerRegistration::schedule
>         REGISTRATION_RELEASE_LOG_IF_ALLOWED("scheduleTaskToFireUpdateFoundEvent: Firing updatefound event for registration %llu", identifier().toUInt64());
> 
>         ASSERT(m_pendingActivityForEventDispatch);
>-        dispatchEvent(Event::create(eventNames().updatefoundEvent, false, false));
>+        dispatchEvent(Event::create(eventNames().updatefoundEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     });
> }
> 
>Index: Source/WebCore/workers/service/context/ServiceWorkerThreadProxy.cpp
>===================================================================
>--- Source/WebCore/workers/service/context/ServiceWorkerThreadProxy.cpp	(revision 234910)
>+++ Source/WebCore/workers/service/context/ServiceWorkerThreadProxy.cpp	(working copy)
>@@ -181,7 +181,7 @@ void ServiceWorkerThreadProxy::notifyNet
>     postTaskForModeToWorkerGlobalScope([isOnline] (ScriptExecutionContext& context) {
>         auto& globalScope = downcast<WorkerGlobalScope>(context);
>         globalScope.setIsOnline(isOnline);
>-        globalScope.dispatchEvent(Event::create(isOnline ? eventNames().onlineEvent : eventNames().offlineEvent, false, false));
>+        globalScope.dispatchEvent(Event::create(isOnline ? eventNames().onlineEvent : eventNames().offlineEvent, Event::CanBubble::No, Event::IsCancelable::No));
>     }, WorkerRunLoop::defaultMode());
> }
> 
>Index: Source/WebCore/xml/XMLHttpRequest.cpp
>===================================================================
>--- Source/WebCore/xml/XMLHttpRequest.cpp	(revision 234910)
>+++ Source/WebCore/xml/XMLHttpRequest.cpp	(working copy)
>@@ -302,8 +302,10 @@ void XMLHttpRequest::callReadyStateChang
>     // Check whether sending load and loadend events before sending readystatechange event, as it may change m_error/m_state values.
>     bool shouldSendLoadEvent = (m_state == DONE && !m_error);
> 
>-    if (m_async || (m_state <= OPENED || m_state == DONE))
>-        m_progressEventThrottle.dispatchReadyStateChangeEvent(Event::create(eventNames().readystatechangeEvent, false, false), m_state == DONE ? FlushProgressEvent : DoNotFlushProgressEvent);
>+    if (m_async || (m_state <= OPENED || m_state == DONE)) {
>+        m_progressEventThrottle.dispatchReadyStateChangeEvent(Event::create(eventNames().readystatechangeEvent, Event::CanBubble::No, Event::IsCancelable::No),
>+            m_state == DONE ? FlushProgressEvent : DoNotFlushProgressEvent);
>+    }
> 
>     if (shouldSendLoadEvent) {
>         m_progressEventThrottle.dispatchProgressEvent(eventNames().loadEvent);
>Index: Source/WebKit/ChangeLog
>===================================================================
>--- Source/WebKit/ChangeLog	(revision 234976)
>+++ Source/WebKit/ChangeLog	(working copy)
>@@ -1,3 +1,13 @@
>+2018-08-16  Ryosuke Niwa  <rniwa@webkit.org>
>+
>+        Replace canBubble and cancelable booleans in Event by enum classes
>+        https://bugs.webkit.org/show_bug.cgi?id=188692
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * WebProcess/WebPage/WebPage.cpp:
>+        (WebKit::WebPage::navigateToPDFLinkWithSimulatedClick):
>+
> 2018-08-16  Commit Queue  <commit-queue@webkit.org>
> 
>         Unreviewed, rolling out r234958.
>Index: Source/WebKit/WebProcess/WebPage/WebPage.cpp
>===================================================================
>--- Source/WebKit/WebProcess/WebPage/WebPage.cpp	(revision 234910)
>+++ Source/WebKit/WebProcess/WebPage/WebPage.cpp	(working copy)
>@@ -1355,7 +1355,8 @@ void WebPage::navigateToPDFLinkWithSimul
>         return;
> 
>     const int singleClick = 1;
>-    RefPtr<MouseEvent> mouseEvent = MouseEvent::create(eventNames().clickEvent, true, true, MonotonicTime::now(), nullptr, singleClick, screenPoint.x(), screenPoint.y(), documentPoint.x(), documentPoint.y(),
>+    RefPtr<MouseEvent> mouseEvent = MouseEvent::create(eventNames().clickEvent, Event::CanBubble::Yes, Event::IsCancelable::Yes,
>+        MonotonicTime::now(), nullptr, singleClick, screenPoint.x(), screenPoint.y(), documentPoint.x(), documentPoint.y(),
> #if ENABLE(POINTER_LOCK)
>         0, 0,
> #endif
>Index: Source/WebKitLegacy/ios/ChangeLog
>===================================================================
>--- Source/WebKitLegacy/ios/ChangeLog	(revision 234910)
>+++ Source/WebKitLegacy/ios/ChangeLog	(working copy)
>@@ -1,3 +1,13 @@
>+2018-08-16  Ryosuke Niwa  <rniwa@webkit.org>
>+
>+        Replace canBubble and cancelable booleans in Event by enum classes
>+        https://bugs.webkit.org/show_bug.cgi?id=188692
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * WebView/WebPDFViewPlaceholder.mm:
>+        (-[WebPDFViewPlaceholder simulateClickOnLinkToURL:]):
>+
> 2018-08-13  Alex Christensen  <achristensen@webkit.org>
> 
>         Use a 1-byte enum class for TextDirection
>Index: Source/WebKitLegacy/ios/WebView/WebPDFViewPlaceholder.mm
>===================================================================
>--- Source/WebKitLegacy/ios/WebView/WebPDFViewPlaceholder.mm	(revision 234910)
>+++ Source/WebKitLegacy/ios/WebView/WebPDFViewPlaceholder.mm	(working copy)
>@@ -479,7 +479,7 @@ - (void)simulateClickOnLinkToURL:(NSURL 
>         return;
> 
>     // Construct an event to simulate a click.
>-    RefPtr<Event> event = MouseEvent::create(eventNames().clickEvent, true, true, MonotonicTime::now(), 0, 1, 0, 0, 0, 0,
>+    RefPtr<Event> event = MouseEvent::create(eventNames().clickEvent, Event::CanBubble::Yes, Event::IsCancelable::Yes, MonotonicTime::now(), 0, 1, 0, 0, 0, 0,
> #if ENABLE(POINTER_LOCK)
>         0, 0,
> #endif
>Index: Source/WebKitLegacy/mac/ChangeLog
>===================================================================
>--- Source/WebKitLegacy/mac/ChangeLog	(revision 234910)
>+++ Source/WebKitLegacy/mac/ChangeLog	(working copy)
>@@ -1,3 +1,15 @@
>+2018-08-16  Ryosuke Niwa  <rniwa@webkit.org>
>+
>+        Replace canBubble and cancelable booleans in Event by enum classes
>+        https://bugs.webkit.org/show_bug.cgi?id=188692
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * WebView/WebPDFView.mm:
>+        (-[WebPDFView PDFViewWillClickOnLink:withURL:]):
>+        * WebView/WebView.mm:
>+        (-[WebView _dispatchUnloadEvent]):
>+
> 2018-08-15  Tim Horton  <timothy_horton@apple.com>
> 
>         Crashes in Quip under _dictionaryPopupInfoForRange, in setObject:forKey:
>Index: Source/WebKitLegacy/mac/WebView/WebPDFView.mm
>===================================================================
>--- Source/WebKitLegacy/mac/WebView/WebPDFView.mm	(revision 234910)
>+++ Source/WebKitLegacy/mac/WebView/WebPDFView.mm	(working copy)
>@@ -1030,7 +1030,7 @@ - (void)PDFViewWillClickOnLink:(PDFView 
>         break;
>     }
>     if (button != noButton) {
>-        event = MouseEvent::create(eventNames().clickEvent, true, true, MonotonicTime::now(), 0, [nsEvent clickCount], 0, 0, 0, 0,
>+        event = MouseEvent::create(eventNames().clickEvent, Event::CanBubble::Yes, Event::IsCancelable::Yes, MonotonicTime::now(), 0, [nsEvent clickCount], 0, 0, 0, 0,
> #if ENABLE(POINTER_LOCK)
>             0, 0,
> #endif
>Index: Source/WebKitLegacy/mac/WebView/WebView.mm
>===================================================================
>--- Source/WebKitLegacy/mac/WebView/WebView.mm	(revision 234910)
>+++ Source/WebKitLegacy/mac/WebView/WebView.mm	(working copy)
>@@ -2144,7 +2144,7 @@ - (void)_dispatchUnloadEvent
>         if (coreMainFrame) {
>             Document *document = coreMainFrame->document();
>             if (document)
>-                document->dispatchWindowEvent(Event::create(eventNames().unloadEvent, false, false));
>+                document->dispatchWindowEvent(Event::create(eventNames().unloadEvent, Event::CanBubble::No, Event::IsCancelable::No));
>         }
>     });
> }

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Attachments on bug 188692: 347351 | 347352