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 784x36 children: not-inline
      BlockContainer <input.btn> at (13,10) content-size 195.796875x32 children: not-inline
        BlockContainer <(anonymous)> at (13,10) content-size 195.796875x32 flex-container(column) [FFC] children: not-inline
          BlockContainer <(anonymous)> at (13,18) content-size 195.796875x16 flex-item [BFC] children: inline
            frag 0 from BlockContainer start: 0, length: 0, rect: [13,18 195.796875x16] baseline: 12.5
            BlockContainer <span> at (13,18) content-size 195.796875x16 inline-block [BFC] children: inline
              frag 0 from TextNode start: 0, length: 26, rect: [13,18 195.796875x16] baseline: 12.5
                  "Width should shrink to fit"
              TextNode <#text>
      BlockContainer <(anonymous)> at (8,44) content-size 784x0 children: inline
        TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x36]
      PaintableWithLines (BlockContainer<INPUT>.btn) [8,8 205.796875x36]
        PaintableWithLines (BlockContainer(anonymous)) [13,10 195.796875x32]
          PaintableWithLines (BlockContainer(anonymous)) [13,18 195.796875x16]
            PaintableWithLines (BlockContainer<SPAN>) [13,18 195.796875x16]
              TextPaintable (TextNode<#text>)
      PaintableWithLines (BlockContainer(anonymous)) [8,44 784x0]
