Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x33 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 0x17 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 800x33]
    PaintableWithLines (BlockContainer<BODY>) [8,8 0x17]
      ImagePaintable (ImageBox<IMG>) [8,21 0x0]
