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 70 0+1+0] [BFC] children: not-inline
    Box <body> at [10,10] [8+1+0 200 0+1+588] [8+1+0 52 0+1+8] [GFC] children: not-inline
      BlockContainer <div.item> at [11,11] [0+1+0 100 0+1+0] [0+1+0 50 0+1+0] [BFC] children: not-inline

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x72]
    PaintableBox (Box<BODY>) [9,9 202x54]
      PaintableWithLines (BlockContainer<DIV>.item) [10,10 102x52]

SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
 SC for BlockContainer<HTML> [1,1 798x70] [children: 0] (z-index: auto)
