Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x516 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x500 children: not-inline
      Box <div.grid> at (8,8) content-size 100x500 [GFC] children: not-inline
        ImageBox <img> at (8,8) content-size 500x500 children: not-inline

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x516]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x500]
      PaintableBox (Box<DIV>.grid) [8,8 100x500] overflow: [8,8 500x500]
        ImagePaintable (ImageBox<IMG>) [8,8 500x500]
