Bug 264276

e.g. Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 WebCore 0x1bab13ba8 WTF::OptionSet<WebCore::Node::NodeFlag>::containsAny(WTF::OptionSet<WebCore::Node::NodeFlag>) const + 0 (/usr/local/include/wtf/OptionSet.h:172) [inlined] 1 WebCore 0x1bab13ba8 WTF::OptionSet<WebCore::Node::NodeFlag>::contains(WebCore::Node::NodeFlag) const + 0 (/usr/local/include/wtf/OptionSet.h:167) [inlined] 2 WebCore 0x1bab13ba8 WebCore::Node::hasNodeFlag(WebCore::Node::NodeFlag) const + 0 (Sources/WebCore/Source/WebCore/dom/Node.h:619) [inlined] 3 WebCore 0x1bab13ba8 WebCore::Node::isElementNode() const + 0 (Sources/WebCore/Source/WebCore/dom/Node.h:199) [inlined] 4 WebCore 0x1bab13ba8 WebCore::Node::pseudoId() const + 0 (Sources/WebCore/Source/WebCore/dom/Node.h:214) [inlined] 5 WebCore 0x1bab13ba8 WebCore::Node::isPseudoElement() const + 0 (Sources/WebCore/Source/WebCore/dom/Node.h:211) [inlined] 6 WebCore 0x1bab13ba8 WTF::TypeCastTraits<WebCore::PseudoElement const, WebCore::Node const, false>::isType(WebCore::Node const&) + 0 (Sources/WebCore/Source/WebCore/dom/PseudoElement.h:62) [inlined] 7 WebCore 0x1bab13ba8 WTF::TypeCastTraits<WebCore::PseudoElement const, WebCore::Node const, false>::isOfType(WebCore::Node const&) + 0 (Sources/WebCore/Source/WebCore/dom/PseudoElement.h:61) [inlined] 8 WebCore 0x1bab13ba8 bool WTF::is<WebCore::PseudoElement, WebCore::Node>(WebCore::Node&) + 0 (/usr/local/include/wtf/TypeCasts.h:58) [inlined] 9 WebCore 0x1bab13ba8 WebCore::EventPath::eventTargetRespectingTargetRules(WebCore::Node&) + 0 (Sources/WebCore/Source/WebCore/dom/EventPath.h:67) [inlined] 10 WebCore 0x1bab13ba8 WebCore::EventPath::buildPath(WebCore::Node&, WebCore::Event&) + 2828 (Sources/WebCore/Source/WebCore/dom/EventPath.cpp:139) 11 WebCore 0x1bab06bd4 WebCore::EventPath::EventPath(WebCore::Node&, WebCore::Event&) + 48 (Sources/WebCore/Source/WebCore/dom/EventPath.cpp:72) [inlined] 12 WebCore 0x1bab06bd4 WebCore::EventPath::EventPath(WebCore::Node&, WebCore::Event&) + 48 (Sources/WebCore/Source/WebCore/dom/EventPath.cpp:71) [inlined] 13 WebCore 0x1bab06bd4 WebCore::EventDispatcher::dispatchEvent(WebCore::Node&, WebCore::Event&) + 152 (Sources/WebCore/Source/WebCore/dom/EventDispatcher.cpp:158) 14 WebCore 0x1baadb6f8 WebCore::Element::dispatchMouseEvent(WebCore::PlatformMouseEvent const&, WTF::AtomString const&, int, WebCore::Element*, WebCore::IsSyntheticClick) + 948 (Sources/WebCore/Source/WebCore/dom/Element.cpp:492) 15 WebCore 0x1bb201eec WebCore::EventHandler::updateMouseEventTargetNode(WTF::AtomString const&, WebCore::Node*, WebCore::PlatformMouseEvent const&, WebCore::EventHandler::FireMouseOverOut) + 2504 (Sources/WebCore/Source/WebCore/page/EventHandler.cpp:2735) 16 WebCore 0x1bb1ff93c WebCore::EventHandler::dispatchMouseEvent(WTF::AtomString const&, WebCore::Node*, int, WebCore::PlatformMouseEvent const&, WebCore::EventHandler::FireMouseOverOut) + 80 (Sources/WebCore/Source/WebCore/page/EventHandler.cpp:2834) 17 WebCore 0x1bb201028 WebCore::EventHandler::handleMouseMoveEvent(WebCore::PlatformMouseEvent const&, WebCore::HitTestResult*, bool) + 1460 (Sources/WebCore/Source/WebCore/page/EventHandler.cpp:2149) 18 WebCore 0x1bb200918 WebCore::EventHandler::mouseMoved(WebCore::PlatformMouseEvent const&) + 228 (Sources/WebCore/Source/WebCore/page/EventHandler.cpp:1995) 19 WebKit 0x1bc6bde04 WebKit::dispatchSyntheticMouseMove(WebCore::LocalFrame&, WebCore::FloatPoint const&, WTF::OptionSet<WebKit::WebEventModifier>, unsigned int) + 276 (Sources/WebKit/Source/WebKit/WebProcess/WebPage/ios/WebPageIOS.mm:718) 20 WebKit 0x1bc6bd24c WebKit::WebPage::handleSyntheticClick(WebCore::Node&, WebCore::FloatPoint const&, WTF::OptionSet<WebKit::WebEventModifier>, unsigned int) + 268 (Sources/WebKit/Source/WebKit/WebProcess/WebPage/ios/WebPageIOS.mm:785) <rdar://117902151>