Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x43 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x27 children: inline
      frag 0 from BlockContainer start: 0, length: 0, rect: [9,9 200x25] baseline: 18.5
      BlockContainer <input#foo> at (9,9) content-size 200x25 inline-block [BFC] children: not-inline
        Box <div> at (11,10) content-size 196x23 flex-container(row) [FFC] children: not-inline
          BlockContainer <div> at (11,10) content-size 196x23 flex-item [BFC] children: inline
            frag 0 from TextNode start: 0, length: 4, rect: [11,10 62.1875x23] baseline: 17.5
                "PASS"
            TextNode <#text>
      TextNode <#text>
      TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x43]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x27]
      PaintableWithLines (BlockContainer<INPUT>#foo) [8,8 202x27]
        PaintableBox (Box<DIV>) [9,9 200x25]
          PaintableWithLines (BlockContainer<DIV>) [11,10 196x23]
            TextPaintable (TextNode<#text>)
