Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (1,1) content-size 798x45 [BFC] children: not-inline
    BlockContainer <body> at (10,10) content-size 780x27 children: inline
      frag 0 from BlockContainer start: 0, length: 0, rect: [11,11 200x25] baseline: 27
      BlockContainer <input> at (11,11) content-size 200x25 inline-block [BFC] children: not-inline
        Box <div> at (13,12) content-size 196x23 flex-container(row) [FFC] children: not-inline
          BlockContainer <div> at (13,12) content-size 196x23 flex-item [BFC] children: inline
            TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x47]
    PaintableWithLines (BlockContainer<BODY>) [9,9 782x29]
      PaintableWithLines (BlockContainer<INPUT>) [10,10 202x27]
        PaintableBox (Box<DIV>) [11,11 200x25]
          PaintableWithLines (BlockContainer<DIV>) [13,12 196x23]
