backgroundIsKnownToBeOpaqueInRect 1272 Source/core/rendering/RenderBox.cpp bool RenderBox::backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const backgroundIsKnownToBeOpaqueInRect 3625 Source/core/rendering/RenderLayer.cpp bool RenderLayer::backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const backgroundIsKnownToBeOpaqueInRect 951 Source/core/rendering/RenderView.cpp bool RenderView::backgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const