Viewport <#document> at [0,0] [0+0+0 800 0+0+0] [0+0+0 600 0+0+0] [BFC] children: not-inline
  BlockContainer <html> at [0,0] [0+0+0 800 0+0+0] [0+0+0 20 0+0+0] [BFC] children: not-inline
    BlockContainer <body> at [0,0] [0+0+0 800 0+0+0] [0+0+0 20 0+0+0] children: not-inline
      Box <div.parent> at [0,0] [0+0+0 800 0+0+0] [0+0+0 20 0+0+0] [GFC] children: not-inline
        Box <div.subgrid> at [60,0] [0+0+0 230 0+0+0] [0+0+0 20 0+0+0] [GFC] children: not-inline
          BlockContainer <div.first> at [60,0] [0+0+0 60 0+0+0] [0+0+0 20 0+0+0] [BFC] children: not-inline
          BlockContainer <div.second> at [130,0] [0+0+0 160 0+0+0] [0+0+0 20 0+0+0] [BFC] children: not-inline
      BlockContainer <(anonymous)> at [0,20] [0+0+0 800 0+0+0] [0+0+0 0 0+0+0] children: inline
        TextNode <#text> (not painted)

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x20]
    PaintableWithLines (BlockContainer<BODY>) [0,0 800x20]
      PaintableBox (Box<DIV>.parent) [0,0 800x20]
        PaintableBox (Box<DIV>.subgrid) [60,0 230x20]
          PaintableWithLines (BlockContainer<DIV>.first) [60,0 60x20]
          PaintableWithLines (BlockContainer<DIV>.second) [130,0 160x20]
      PaintableWithLines (BlockContainer(anonymous)) [0,20 800x0]

SC for Viewport<#document> [0,0 800x600] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x20] (z-index: auto)
