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layer at (0,0) size 800x52
  RenderBlock {HTML} at (0,0) size 800x52
    RenderBody {BODY} at (8,16) size 784x20
      RenderBlock {P} at (0,0) size 784x20 [bgcolor=#00FF00]
        RenderText {#text} at (0,0) size 308x19
          text run at (0,0) width 308: "This paragraph should have a green background"
