Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (1,1) content-size 798x55 [BFC] children: not-inline
    Box <body> at (10,10) content-size 780x37 [GFC] children: not-inline
      BlockContainer <h1> at (55.5,11) content-size 689x35 [BFC] children: inline
        frag 0 from TextNode start: 0, length: 13, rect: [55.5,11 200.40625x35] baseline: 27.09375
            "hello friends"
        TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x57]
    PaintableBox (Box<BODY>) [9,9 782x39]
      PaintableWithLines (BlockContainer<H1>) [54.5,10 691x37]
        TextPaintable (TextNode<#text>)
