Viewport <#document> at [0,0] [0+0+0 800 0+0+0] [0+0+0 600 0+0+0] children: not-inline
  BlockContainer <html> at [0,0] [0+0+0 800 0+0+0] [0+0+0 105.875 0+0+0] [BFC] children: not-inline
    BlockContainer <body> at [8,21.4375] [8+0+0 784 0+0+8] [8+0+0 76.4375 0+0+8] children: not-inline
      BlockContainer <h1> at [8,21.4375] [0+0+0 784 0+0+0] [21.4375+0+0 37 0+0+21.4375] children: inline
        frag 0 from TextNode start: 0, length: 6, rect: [8,21.4375 105.53125x37] baseline: 28.09375
            "header"
        TextNode <#text> (not painted)
      BlockContainer <(anonymous)> at [8,79.875] [0+0+0 784 0+0+0] [0+0+0 18 0+0+0] children: inline
        frag 0 from TextNode start: 0, length: 24, rect: [8,79.875 212.125x18] baseline: 13.796875
            "anonymously wrapped text"
        TextNode <#text> (not painted)

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x105.875]
    PaintableWithLines (BlockContainer<BODY>) [8,21.4375 784x76.4375]
      PaintableWithLines (BlockContainer<H1>) [8,21.4375 784x37]
        TextPaintable (TextNode<#text>)
      PaintableWithLines (BlockContainer(anonymous)) [8,79.875 784x18]
        TextPaintable (TextNode<#text>)

SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x105.875] [children: 0] (z-index: auto)
