Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x16 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x0 children: not-inline
      Box <div#box1> at (8,8) content-size 784x0 flex-container(row) [FFC] children: not-inline
        BlockContainer <div> at (8,8) content-size 0x0 flex-item [BFC] children: not-inline
          Box <div#box2> at (8,8) content-size 0x0 floating flex-container(row) [FFC] children: not-inline

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
      PaintableBox (Box<DIV>#box1) [8,8 784x0]
        PaintableWithLines (BlockContainer<DIV>) [8,8 0x0]
          PaintableBox (Box<DIV>#box2) [8,8 0x0]
