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 50 0+0+0] [BFC] children: not-inline
    BlockContainer <body> at [8,8] [8+0+0 784 0+0+8] [8+0+0 34 0+0+8] children: not-inline
      BlockContainer <div> at [8,8] [0+0+0 784 0+0+0] [0+0+0 34 0+0+0] children: inline
        frag 0 from TextNode start: 0, length: 1, rect: [8,10 15.765625x30] baseline: 22.796875
            "x"
        frag 1 from Box start: 0, length: 0, rect: [28.765625,10 14.78125x30] baseline: 24.796875
        frag 2 from TextNode start: 0, length: 1, rect: [48.546875,10 11.65625x30] baseline: 22.796875
            "y"
        TextNode <#text> (not painted)
        Box <button> at [28.765625,10] flex-container(row) [0+1+4 14.78125 4+1+0] [0+1+1 30 1+1+0] [FFC] children: not-inline
          Box <span> at [28.765625,10] flex-container(row) flex-item [0+0+0 14.78125 0+0+0] [0+0+0 30 0+0+0] [FFC] children: not-inline
            BlockContainer <(anonymous)> at [28.765625,10] flex-item [0+0+0 14.78125 0+0+0] [0+0+0 30 0+0+0] [BFC] children: inline
              frag 0 from TextNode start: 0, length: 1, rect: [28.765625,10 14.78125x30] baseline: 22.796875
                  "3"
              TextNode <#text> (not painted)
        TextNode <#text> (not painted)
      BlockContainer <(anonymous)> at [8,42] [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]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x50]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x34]
      PaintableWithLines (BlockContainer<DIV>) [8,8 784x34]
        TextPaintable (TextNode<#text>)
        PaintableBox (Box<BUTTON>) [23.765625,8 24.78125x34]
          PaintableBox (Box<SPAN>) [28.765625,10 14.78125x30]
            PaintableWithLines (BlockContainer(anonymous)) [28.765625,10 14.78125x30]
              TextPaintable (TextNode<#text>)
        TextPaintable (TextNode<#text>)
      PaintableWithLines (BlockContainer(anonymous)) [8,42 784x0]

SC for Viewport<#document> [0,0 800x600] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x50] (z-index: auto)
