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 784x200 children: not-inline
      Box <div.grid-container> at (8,8) content-size 784x200 [GFC] children: not-inline
        BlockContainer <div.first> at (8,8) content-size 100x200 [BFC] children: inline
          frag 0 from TextNode start: 0, length: 5, rect: [8,8 42.140625x17] baseline: 13.296875
              "First"
          TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x200]
      PaintableBox (Box<DIV>.grid-container) [8,8 784x200]
        PaintableWithLines (BlockContainer<DIV>.first) [8,8 100x200]
          TextPaintable (TextNode<#text>)
