regionAtBlockOffset 4871 Source/core/rendering/RenderBlock.cpp RenderRegion* RenderBlock::regionAtBlockOffset(LayoutUnit blockOffset) const
regionAtBlockOffset  225 Source/core/rendering/RenderFlowThread.cpp RenderRegion* RenderFlowThread::regionAtBlockOffset(LayoutUnit offset, bool extendLastRegion, RegionAutoGenerationPolicy autoGenerationPolicy)