Viewport <#document> at [0,0] [0+0+0 800 0+0+0] [0+0+0 600 0+0+0] [BFC] children: not-inline BlockContainer at [0,0] [0+0+0 800 0+0+0] [0+0+0 610 0+0+0] [BFC] children: not-inline BlockContainer at [8,13] [8+0+0 784 0+0+8] [8+0+0 584 0+0+13] children: not-inline BlockContainer <(anonymous)> at [8,13] [0+0+0 784 0+0+0] [0+0+0 0 0+0+0] children: inline TextNode <#text> (not painted) BlockContainer 
 at [8,13] [0+0+0 784 0+0+0] [13+0+0 17 0+0+13] children: inline
        frag 0 from TextInputBox start: 0, length: 0, rect: [11,15 160x13] baseline: 15
        TextInputBox  at [11,15] inline-block [0+1+2 160 2+1+0] [0+1+1 13 1+1+0] [BFC] children: not-inline
          Box 
 at [11,15] flex-container(row) [0+0+0 160 0+0+0] [0+0+0 13 0+0+0] [FFC] children: not-inline
            BlockContainer 
 at [11,15] flex-item [0+0+0 160 0+0+0] [0+0+0 13 0+0+0] [BFC] children: inline
              frag 0 from TextNode start: 0, length: 0, rect: [11,15 0x13] baseline: 10.390625
              TextNode <#text> (not painted)
      BlockContainer <(anonymous)> at [8,43] [0+0+0 784 0+0+0] [0+0+0 0 0+0+0] children: inline
        TextNode <#text> (not painted)

ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x610]
  PaintableWithLines (BlockContainer) [0,0 800x610]
    PaintableWithLines (BlockContainer) [8,13 784x584]
      PaintableWithLines (BlockContainer(anonymous)) [8,13 784x0]
      PaintableWithLines (BlockContainer
) [8,13 784x17]
        PaintableWithLines (TextInputBox) [8,13 166x17]
          Paintable (Box
) [11,15 160x13]
            PaintableWithLines (BlockContainer
) [11,15 160x13]
      PaintableWithLines (BlockContainer(anonymous)) [8,43 784x0]

SC for Viewport<#document> [0,0 800x600] (z-index: auto)
 SC for BlockContainer [0,0 800x610] (z-index: auto)