Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (1,1) content-size 798x122 [BFC] children: not-inline
    BlockContainer <body> at (10,10) content-size 780x104 children: not-inline
      Box <div.grid> at (11,11) content-size 778x102 [GFC] children: not-inline
        BlockContainer <div.float-left> at (12,12) content-size 100x100 floating [BFC] children: not-inline

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x124]
    PaintableWithLines (BlockContainer<BODY>) [9,9 782x106]
      PaintableBox (Box<DIV>.grid) [10,10 780x104]
        PaintableWithLines (BlockContainer<DIV>.float-left) [11,11 102x102]
