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 [1,1] [0+1+0 798 0+1+0] [0+1+0 120 0+1+0] [BFC] children: not-inline
    Box <body> at [10,10] flex-container(column) [8+1+0 780 0+1+8] [8+1+0 102 0+1+8] [FFC] children: not-inline
      ImageBox <img> at [11,11] flex-item [0+1+0 100 0+1+0] [0+1+0 100 0+1+0] children: not-inline

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x122]
    PaintableBox (Box<BODY>) [9,9 782x104]
      ImagePaintable (ImageBox<IMG>) [10,10 102x102]

SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
 SC for BlockContainer<HTML> [1,1 798x120] [children: 0] (z-index: auto)
