Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x600 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x102 children: not-inline
      BlockContainer <div.box> at (9,9) content-size 100x100 positioned [BFC] children: not-inline
      BlockContainer <(anonymous)> at (8,110) content-size 784x0 children: inline
        TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x102]
      PaintableWithLines (BlockContainer<DIV>.box) [8,8 102x102]
      PaintableWithLines (BlockContainer(anonymous)) [8,110 784x0]
