Viewport <#document> at [0,0] [0+0+0 800 0+0+0] [0+0+0 600 0+0+0] children: not-inline
  BlockContainer <html> at [0,0] [0+0+0 800 0+0+0] [0+0+0 216 0+0+0] [BFC] children: not-inline
    Box <body> at [8,8] flex-container(row) [8+0+0 784 0+0+8] [8+0+0 200 0+0+8] [FFC] children: not-inline
      BlockContainer <div> at [8,58] flex-item [0+0+0 100 0+0+0] [0+0+0 100 0+0+0] [BFC] children: not-inline
      BlockContainer <span> at [108,108] flex-item [0+0+0 100 0+0+0] [100+0+0 100 0+0+0] [BFC] children: not-inline

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x216]
    PaintableBox (Box<BODY>) [8,8 784x200]
      PaintableWithLines (BlockContainer<DIV>) [8,58 100x100]
      PaintableWithLines (BlockContainer<SPAN>) [108,108 100x100]

SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x216] [children: 0] (z-index: auto)
