Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (1,1) content-size 798x18 [BFC] children: not-inline
    BlockContainer <body> at (10,10) content-size 780x0 children: inline
      TextNode <#text>
      BlockContainer <div.only-t-l> at (6,6) content-size 10x10 positioned [BFC] children: not-inline
      TextNode <#text>
      BlockContainer <div.only-mt-ml> at (16,16) content-size 10x10 positioned [BFC] children: not-inline
      TextNode <#text>
      BlockContainer <div.both> at (11,11) content-size 10x10 positioned [BFC] children: not-inline
      TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x20]
    PaintableWithLines (BlockContainer<BODY>) [9,9 782x2]
      PaintableWithLines (BlockContainer<DIV>.only-t-l) [5,5 12x12]
      PaintableWithLines (BlockContainer<DIV>.only-mt-ml) [15,15 12x12]
      PaintableWithLines (BlockContainer<DIV>.both) [10,10 12x12]
