Viewport <#document> at [0,0] [0+0+0 800 0+0+0] [0+0+0 600 0+0+0] [BFC] children: not-inline
  BlockContainer <html> at [1,1] [0+1+0 798 0+1+0] [0+1+0 57 0+1+0] [BFC] children: not-inline
    Box <body> at [10,10] [8+1+0 780 0+1+8] [8+1+0 39 0+1+8] [GFC] children: not-inline
      BlockContainer <h1> at [55.5,11] [0+1+0 689 0+1+0] [0+1+0 37 0+1+0] [BFC] children: inline
        frag 0 from TextNode start: 0, length: 13, rect: [55.5,11 200.40625x37] baseline: 28.09375
            "hello friends"
        TextNode <#text> (not painted)

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x59]
    PaintableBox (Box<BODY>) [9,9 782x41]
      PaintableWithLines (BlockContainer<H1>) [54.5,10 691x39]
        TextPaintable (TextNode<#text>)

SC for Viewport<#document> [0,0 800x600] (z-index: auto)
 SC for BlockContainer<HTML> [1,1 798x57] (z-index: auto)
