Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (1,1) content-size 798x270 [BFC] children: not-inline
    BlockContainer <body> at (10,10) content-size 780x252 children: not-inline
      BlockContainer <div> at (11,11) content-size 250x250 children: not-inline

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x272]
    PaintableWithLines (BlockContainer<BODY>) [9,9 782x254]
      PaintableWithLines (BlockContainer<DIV>) [10,10 252x252]
