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 33 0+0+0] [BFC] children: not-inline
    BlockContainer <body> at [8,8] [8+0+0 784 0+0+8] [8+0+0 17 0+0+8] children: inline
      frag 0 from TextInputBox start: 0, length: 0, rect: [23,15 20x5] baseline: 10
      TextInputBox <input> at [23,15] inline-block [0+5+10 20 10+5+0] [0+5+0 5 0+5+0] [BFC] children: not-inline
        Box <div> at [23,15] flex-container(row) [0+0+0 20 0+0+0] [0+0+0 5 0+0+0] [FFC] children: not-inline
          BlockContainer <div> at [23,15] flex-item [0+0+0 20 0+0+0] [0+0+0 5 0+0+0] [BFC] children: inline
            frag 0 from TextNode start: 0, length: 0, rect: [23,15 0x5] baseline: 4
            TextNode <#text> (not painted)
      TextNode <#text> (not painted)

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x33]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x17]
      PaintableWithLines (TextInputBox<INPUT>) [8,10 50x15]
        Paintable (Box<DIV>) [23,15 20x5]
          PaintableWithLines (BlockContainer<DIV>) [23,15 20x5]

SC for Viewport<#document> [0,0 800x600] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x33] (z-index: auto)
