Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x600 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x50 children: inline
      frag 0 from BlockContainer start: 0, length: 0, rect: [8,8 61.1875x50] baseline: 37
      BlockContainer <div.ib> at (8,8) content-size 61.1875x50 inline-block [BFC] children: inline
        frag 0 from BlockContainer start: 0, length: 0, rect: [9,27 17.828125x23] baseline: 18.5
        frag 1 from TextNode start: 0, length: 1, rect: [27.828125,31 8x18] baseline: 13.796875
            " "
        frag 2 from BlockContainer start: 0, length: 0, rect: [40.828125,10 23.359375x46] baseline: 37
        TextNode <#text>
        BlockContainer <div.label> at (9,27) content-size 17.828125x23 inline-block [BFC] children: inline
          frag 0 from TextNode start: 0, length: 1, rect: [9,27 17.828125x23] baseline: 17.5
              "A"
          TextNode <#text>
        TextNode <#text>
        BlockContainer <button> at (40.828125,10) content-size 23.359375x46 inline-block [BFC] children: not-inline
          BlockContainer <(anonymous)> at (40.828125,10) content-size 23.359375x46 flex-container(column) [FFC] children: not-inline
            BlockContainer <(anonymous)> at (40.828125,10) content-size 23.359375x46 flex-item [BFC] children: not-inline
              BlockContainer <(anonymous)> at (40.828125,10) content-size 23.359375x0 children: inline
                TextNode <#text>
              BlockContainer <div> at (40.828125,10) content-size 23.359375x46 children: inline
                frag 0 from TextNode start: 0, length: 1, rect: [40.828125,10 23.359375x46] baseline: 35
                    "B"
                TextNode <#text>
              BlockContainer <(anonymous)> at (40.828125,56) content-size 23.359375x0 children: inline
                TextNode <#text>
        TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x50]
      PaintableWithLines (BlockContainer<DIV>.ib) [8,8 61.1875x50]
        PaintableWithLines (BlockContainer<DIV>.label) [8,26 19.828125x25]
          TextPaintable (TextNode<#text>)
        TextPaintable (TextNode<#text>)
        PaintableWithLines (BlockContainer<BUTTON>) [35.828125,8 33.359375x50]
          PaintableWithLines (BlockContainer(anonymous)) [40.828125,10 23.359375x46]
            PaintableWithLines (BlockContainer(anonymous)) [40.828125,10 23.359375x46]
              PaintableWithLines (BlockContainer(anonymous)) [40.828125,10 23.359375x0]
              PaintableWithLines (BlockContainer<DIV>) [40.828125,10 23.359375x46]
                TextPaintable (TextNode<#text>)
              PaintableWithLines (BlockContainer(anonymous)) [40.828125,56 23.359375x0]
