Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x58.9375 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x42.9375 children: not-inline
      BlockContainer <button.btn.fixed-width> at (13,10) content-size 190x17.46875 children: not-inline
        BlockContainer <(anonymous)> at (13,10) content-size 190x17.46875 flex-container(column) [FFC] children: not-inline
          BlockContainer <(anonymous)> at (13,10) content-size 190x17.46875 flex-item [BFC] children: inline
            line 0 width: 94.921875, height: 17.46875, bottom: 17.46875, baseline: 13.53125
              frag 0 from TextNode start: 0, length: 11, rect: [61,10 94.921875x17.46875]
                "200px width"
            TextNode <#text>
      BlockContainer <button.btn> at (13,31.46875) content-size 324.671875x17.46875 children: not-inline
        BlockContainer <(anonymous)> at (13,31.46875) content-size 324.671875x17.46875 flex-container(column) [FFC] children: not-inline
          BlockContainer <(anonymous)> at (13,31.46875) content-size 324.671875x17.46875 flex-item [BFC] children: inline
            line 0 width: 324.671875, height: 17.46875, bottom: 17.46875, baseline: 13.53125
              frag 0 from TextNode start: 0, length: 39, rect: [13,31.46875 324.671875x17.46875]
                "auto width should behave as fit-content"
            TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x58.9375]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x42.9375]
      PaintableWithLines (BlockContainer<BUTTON>.btn.fixed-width) [8,8 200x21.46875]
        PaintableWithLines (BlockContainer(anonymous)) [13,10 190x17.46875]
          PaintableWithLines (BlockContainer(anonymous)) [13,10 190x17.46875]
            TextPaintable (TextNode<#text>)
      PaintableWithLines (BlockContainer<BUTTON>.btn) [8,29.46875 334.671875x21.46875]
        PaintableWithLines (BlockContainer(anonymous)) [13,31.46875 324.671875x17.46875]
          PaintableWithLines (BlockContainer(anonymous)) [13,31.46875 324.671875x17.46875]
            TextPaintable (TextNode<#text>)
