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 784x47.6875 children: inline
      line 0 width: 61.1875, height: 47.6875, bottom: 47.6875, baseline: 33.84375
        frag 0 from BlockContainer start: 0, length: 0, rect: [8,8 61.1875x47.6875]
      BlockContainer <div.ib> at (8,8) content-size 61.1875x47.6875 inline-block [BFC] children: inline
        line 0 width: 61.1875, height: 47.6875, bottom: 47.6875, baseline: 33.84375
          frag 0 from BlockContainer start: 0, length: 0, rect: [9,24 17.828125x21.84375]
          frag 1 from TextNode start: 0, length: 1, rect: [28,28 8x17.46875]
            " "
          frag 2 from BlockContainer start: 0, length: 0, rect: [41,10 23.359375x43.6875]
        TextNode <#text>
        BlockContainer <div.label> at (9,24) content-size 17.828125x21.84375 inline-block [BFC] children: inline
          line 0 width: 17.828125, height: 21.84375, bottom: 21.84375, baseline: 16.921875
            frag 0 from TextNode start: 0, length: 1, rect: [9,24 17.828125x21.84375]
              "A"
          TextNode <#text>
        TextNode <#text>
        BlockContainer <button> at (41,10) content-size 23.359375x43.6875 inline-block [BFC] children: not-inline
          BlockContainer <(anonymous)> at (41,10) content-size 23.359375x43.6875 flex-container(column) [FFC] children: not-inline
            BlockContainer <(anonymous)> at (41,10) content-size 23.359375x43.6875 flex-item [BFC] children: inline
              line 0 width: 23.359375, height: 43.6875, bottom: 43.6875, baseline: 33.84375
                frag 0 from TextNode start: 0, length: 1, rect: [41,10 23.359375x43.671875]
                  "B"
              TextNode <#text>
        TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x47.6875]
      PaintableWithLines (BlockContainer<DIV>.ib) [8,8 61.1875x47.6875]
        PaintableWithLines (BlockContainer<DIV>.label) [8,23 19.828125x23.84375]
          TextPaintable (TextNode<#text>)
        TextPaintable (TextNode<#text>)
        PaintableWithLines (BlockContainer<BUTTON>) [36,8 33.359375x47.6875]
          PaintableWithLines (BlockContainer(anonymous)) [41,10 23.359375x43.6875]
            PaintableWithLines (BlockContainer(anonymous)) [41,10 23.359375x43.6875]
              TextPaintable (TextNode<#text>)
