Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x366 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x350 children: inline
      frag 0 from SVGSVGBox start: 0, length: 0, rect: [8,8 784x350] baseline: 350
      SVGSVGBox <svg> at (8,8) content-size 784x350 [SVG] children: not-inline
        SVGGeometryBox <circle> at (250,28) content-size 300x300 children: not-inline
      TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x366]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x350]
      SVGSVGPaintable (SVGSVGBox<svg>) [8,8 784x350]
        SVGPathPaintable (SVGGeometryBox<circle>) [250,28 300x300]
