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+0 136 0+0+0] [BFC] children: not-inline
    BlockContainer <body> at [8,8] [8+0+0 784 0+0+8] [8+0+0 120 0+0+8] children: not-inline
      Box <div.flexContainer> at [8,8] flex-container(column) [0+0+0 784 0+0+0] [0+0+0 120 0+0+0] [FFC] children: not-inline
        BlockContainer <div.item> at [8,8] flex-item [0+0+0 784 0+0+0] [0+0+0 120 0+0+0] [BFC] children: not-inline
          BlockContainer <div.green> at [8,8] [0+0+0 120 0+0+664] [0+0+0 120 0+0+0] children: not-inline

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x136]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x120]
      PaintableBox (Box<DIV>.flexContainer) [8,8 784x120]
        PaintableWithLines (BlockContainer<DIV>.item) [8,8 784x120]
          PaintableWithLines (BlockContainer<DIV>.green) [8,8 120x120]

SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x136] [children: 0] (z-index: auto)
