Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x89.4375 [BFC] children: not-inline
    BlockContainer <body> at (8,21.4375) content-size 784x73.4375 children: not-inline
      BlockContainer <h1> at (8,21.4375) content-size 784x35 children: inline
        frag 0 from TextNode start: 0, length: 6, rect: [8,21.4375 105.53125x35] baseline: 27.09375
            "header"
        TextNode <#text>
      BlockContainer <(anonymous)> at (8,77.875) content-size 784x17 children: inline
        frag 0 from TextNode start: 0, length: 24, rect: [8,77.875 212.125x17] baseline: 13.296875
            "anonymously wrapped text"
        TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x89.4375] overflow: [0,0 800x94.875]
    PaintableWithLines (BlockContainer<BODY>) [8,21.4375 784x73.4375]
      PaintableWithLines (BlockContainer<H1>) [8,21.4375 784x35]
        TextPaintable (TextNode<#text>)
      PaintableWithLines (BlockContainer(anonymous)) [8,77.875 784x17]
        TextPaintable (TextNode<#text>)
