Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x216 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x200 children: inline
      frag 0 from ImageBox start: 0, length: 0, rect: [8,8 200x200] baseline: 200
      ImageBox <img> at (8,8) content-size 200x200 children: not-inline

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x216]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x200]
      ImagePaintable (ImageBox<IMG>) [8,8 200x200]
