Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x800 [BFC] children: not-inline
    Box <body> at (8,8) content-size 784x784 flex-container(row) [FFC] children: not-inline
      SVGSVGBox <svg> at (8,8) content-size 784x784 flex-item [SVG] children: not-inline
        SVGGeometryBox <rect> at (8,8) content-size 392x392 children: not-inline
      BlockContainer <(anonymous)> (not painted) [BFC] children: inline
        TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x800]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x800]
    PaintableBox (Box<BODY>) [8,8 784x784]
      SVGSVGPaintable (SVGSVGBox<svg>) [8,8 784x784]
        SVGPathPaintable (SVGGeometryBox<rect>) [8,8 392x392]
