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  RenderView at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderSVGRoot {svg} at (0,0) size 800x600
    RenderSVGHiddenContainer {defs} at (0,0) size 0x0
      RenderSVGResourceFilter {filter} [id="foo"] [filterUnits=userSpaceOnUse] [primitiveUnits=userSpaceOnUse]
        [feGaussianBlur stdDeviation="3.00, 3.00"]
          [SourceAlpha]
    RenderSVGContainer {g} at (0,0) size 800x600
      RenderSVGContainer {g} at (0,0) size 800x600
        [filter="foo"] RenderSVGResourceFilter {filter} at (-80,-60) size 960x720