Viewport <#document> at [0,0] [0+0+0 800 0+0+0] [0+0+0 600 0+0+0] [BFC] children: not-inline
  BlockContainer <html> at [0,0] [0+0+0 800 0+0+0] [0+0+0 20 0+0+0] [BFC] children: not-inline
    BlockContainer <body> at [0,0] [0+0+0 800 0+0+0] [0+0+0 20 0+0+0] children: not-inline
      Box <section> at [0,0] flex-container(row) [0+0+0 50 0+0+750] [0+0+0 20 0+0+0] [FFC] children: not-inline
        BlockContainer <div> at [0,0] flex-item [0+0+0 10 0+0+0] [0+0+0 20 0+0+0] [BFC] children: not-inline
        Box <span> at [10,0] flex-container(row) flex-item [0+0+0 40 0+0+0] [0+0+0 20 0+0+0] [FFC] children: not-inline
          SVGSVGBox <svg> at [10,0] flex-item [0+0+0 40 0+0+0] [0+0+0 20 0+0+0] [SVG] children: not-inline
      BlockContainer <(anonymous)> at [0,20] [0+0+0 800 0+0+0] [0+0+0 0 0+0+0] children: inline
        TextNode <#text> (not painted)

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x20]
    PaintableWithLines (BlockContainer<BODY>) [0,0 800x20]
      PaintableBox (Box<SECTION>) [0,0 50x20]
        PaintableWithLines (BlockContainer<DIV>) [0,0 10x20]
        PaintableBox (Box<SPAN>) [10,0 40x20]
          SVGSVGPaintable (SVGSVGBox<svg>) [10,0 40x20]
      PaintableWithLines (BlockContainer(anonymous)) [0,20 800x0]

SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x20] [children: 0] (z-index: auto)
