Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x48 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x32 children: not-inline
      ImageBox <img> at (8,8) content-size 16x32 children: not-inline

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x48]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x32]
      ImagePaintable (ImageBox<IMG>) [8,8 16x32]
