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 60 0+0+0] [BFC] children: not-inline
    BlockContainer <body> at [8,8] [8+0+0 784 0+0+8] [8+0+0 44 0+0+8] children: inline
      frag 0 from BlockContainer start: 0, length: 0, rect: [8,8 61.1875x44] baseline: 34
      BlockContainer <div.ib> at [8,8] inline-block [0+0+0 61.1875 0+0+0] [0+0+0 44 0+0+0] [BFC] children: inline
        frag 0 from BlockContainer start: 0, length: 0, rect: [9,26 17.828125x20] baseline: 17
        frag 1 from TextNode start: 0, length: 1, rect: [27.828125,29 8x16] baseline: 12.796875
            " "
        frag 2 from BlockContainer start: 0, length: 0, rect: [40.828125,10 23.359375x40] baseline: 34
        TextNode <#text> (not painted)
        BlockContainer <div.label> at [9,26] inline-block [0+1+0 17.828125 0+1+0] [0+1+0 20 0+1+0] [BFC] children: inline
          frag 0 from TextNode start: 0, length: 1, rect: [9,26 17.828125x20] baseline: 16
              "A"
          TextNode <#text> (not painted)
        TextNode <#text> (not painted)
        BlockContainer <button> at [40.828125,10] inline-block [0+1+4 23.359375 4+1+0] [0+1+1 40 1+1+0] [BFC] children: not-inline
          BlockContainer <(anonymous)> at [40.828125,10] flex-container(column) [0+0+0 23.359375 0+0+0] [0+0+0 40 0+0+0] [FFC] children: not-inline
            BlockContainer <(anonymous)> at [40.828125,10] flex-item [0+0+0 23.359375 0+0+0] [0+0+0 40 0+0+0] [BFC] children: inline
              frag 0 from TextNode start: 0, length: 1, rect: [40.828125,10 23.359375x40] baseline: 32
                  "B"
              TextNode <#text> (not painted)
        TextNode <#text> (not painted)

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x60]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x44]
      PaintableWithLines (BlockContainer<DIV>.ib) [8,8 61.1875x44]
        PaintableWithLines (BlockContainer<DIV>.label) [8,25 19.828125x22]
        PaintableWithLines (BlockContainer<BUTTON>) [35.828125,8 33.359375x44]
          PaintableWithLines (BlockContainer(anonymous)) [40.828125,10 23.359375x40]
            PaintableWithLines (BlockContainer(anonymous)) [40.828125,10 23.359375x40]

SC for Viewport<#document> [0,0 800x600] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x60] (z-index: auto)
