Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x16 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x0 children: inline
      TextNode <#text>
  BlockContainer <dialog#dialog> at (196.671875,275.5) content-size 406.65625x49 positioned [BFC] children: not-inline
    BlockContainer <p> at (196.671875,291.5) content-size 406.65625x17 children: inline
      frag 0 from TextNode start: 0, length: 50, rect: [196.671875,291.5 406.65625x17] baseline: 13.296875
          "Dialog's layout node should be a child of viewport"
      TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
  PaintableWithLines (BlockContainer<DIALOG>#dialog) [177.671875,256.5 444.65625x87]
    PaintableWithLines (BlockContainer<P>) [196.671875,291.5 406.65625x17]
      TextPaintable (TextNode<#text>)
