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layer at (0,0) size 800x56
  RenderBlock {HTML} at (0,0) size 800x56
    RenderBody {BODY} at (8,8) size 784x40
      RenderBlock {DIV} at (0,0) size 784x20
        RenderText {#text} at (0,0) size 144x19
          text run at (0,0) width 144: "This should be unstyled."
      RenderBlock {DIV} at (0,20) size 784x20 [color=#FFFFFF] [bgcolor=#008000]
        RenderText {#text} at (0,0) size 228x19
          text run at (0,0) width 228: "This should have a green background."