Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x416 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x400 children: inline
      frag 0 from SVGSVGBox start: 0, length: 0, rect: [8,8 400x400] baseline: 400
      SVGSVGBox <svg> at (8,8) content-size 400x400 [SVG] children: inline
        TextNode <#text>
        TextNode <#text>
        SVGGeometryBox <rect> at (8,8) content-size 200x200 children: not-inline
          SVGMaskBox <mask#myMask> at (8,8) content-size 200x200 children: inline
            TextNode <#text>
            SVGGeometryBox <rect> at (8,8) content-size 200x200 children: not-inline
            TextNode <#text>
            SVGGeometryBox <circle> at (26.75,26.75) content-size 162.5x162.5 children: not-inline
            TextNode <#text>
        TextNode <#text>
        SVGGeometryBox <rect> at (208,208) content-size 200x100 children: not-inline
          SVGMaskBox <mask#myMask> at (208,208) content-size 200x100 children: inline
            TextNode <#text>
            SVGGeometryBox <rect> at (208,208) content-size 200x100 children: not-inline
            TextNode <#text>
            SVGGeometryBox <circle> at (226.75,217.375) content-size 162.5x81.25 children: not-inline
            TextNode <#text>
        TextNode <#text>
      TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x416]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x400]
      SVGSVGPaintable (SVGSVGBox<svg>) [8,8 400x400]
        SVGPathPaintable (SVGGeometryBox<rect>) [8,8 200x200]
        SVGPathPaintable (SVGGeometryBox<rect>) [208,208 200x100]
