Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x34 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 0x18 children: inline
      frag 0 from ImageBox start: 0, length: 0, rect: [8,21 0x0] baseline: 0
      ImageBox <img> at (8,21) content-size 0x0 children: not-inline

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x34]
    PaintableWithLines (BlockContainer<BODY>) [8,8 0x18]
      ImagePaintable (ImageBox<IMG>) [8,21 0x0]

SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
