findUnsafeParentScrollPropagationBoundary  572 Source/core/dom/Document.h     LocalFrame* findUnsafeParentScrollPropagationBoundary();
findUnsafeParentScrollPropagationBoundary 1190 Source/core/loader/FrameLoader.cpp     RefPtr<LocalFrame> boundaryFrame(url.hasFragmentIdentifier() ? m_frame->document()->findUnsafeParentScrollPropagationBoundary() : 0);