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 [0,0] [0+0+0 800 0+0+0] [0+0+0 34 0+0+0] [BFC] children: not-inline
    Box <body> at [8,8] [8+0+0 784 0+0+8] [8+0+0 18 0+0+8] [GFC] children: not-inline
      BlockContainer <nav> at [8,8] [0+0+0 39.78125 0+0+0] [0+0+0 18 0+0+0] [BFC] children: inline
        frag 0 from TextNode start: 0, length: 5, rect: [8,8 39.78125x18] baseline: 13.796875
            "Hello"
        TextNode <#text> (not painted)

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x34]
    PaintableBox (Box<BODY>) [8,8 784x18]
      PaintableWithLines (BlockContainer<NAV>) [8,8 39.78125x18]
        TextPaintable (TextNode<#text>)

SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x34] [children: 0] (z-index: auto)
