layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x52
  RenderBlock {HTML} at (0,0) size 800x52 [bgcolor=#00FF00]
    RenderBody {BODY} at (8,16) size 784x20
      RenderBlock {P} at (0,0) size 784x20
        RenderText {#text} at (0,0) size 299x19
          text run at (0,0) width 299: "The background of the document should be green"