Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x89.84375 [BFC] children: not-inline
    BlockContainer <body> at (8,21.4375) content-size 784x73.84375 children: not-inline
      BlockContainer <h1> at (8,21.4375) content-size 784x34.9375 children: inline
        line 0 width: 105.53125, height: 34.9375, bottom: 34.9375, baseline: 27.0625
          frag 0 from TextNode start: 0, length: 6, rect: [8,21.4375 105.53125x34.9375]
            "header"
        TextNode <#text>
      BlockContainer <(anonymous)> at (8,77.8125) content-size 784x17.46875 children: inline
        line 0 width: 212.125, height: 17.46875, bottom: 17.46875, baseline: 13.53125
          frag 0 from TextNode start: 0, length: 24, rect: [8,77.8125 212.125x17.46875]
            "anonymously wrapped text"
        TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x89.84375] overflow: [0,0 800x95.28125]
    PaintableWithLines (BlockContainer<BODY>) [8,21.4375 784x73.84375]
      PaintableWithLines (BlockContainer<H1>) [8,21.4375 784x34.9375]
        TextPaintable (TextNode<#text>)
      PaintableWithLines (BlockContainer(anonymous)) [8,77.8125 784x17.46875]
        TextPaintable (TextNode<#text>)
