layer at (0,0) size 800x600
  RenderCanvas at (0,0) size 800x600
layer at (0,0) size 800x50
  RenderBlock {HTML} at (0,0) size 800x50
    RenderBody {BODY} at (8,16) size 784x18
      RenderBlock {FORM} at (0,0) size 784x18 [bgcolor=#00FF00]
        RenderBlock {P} at (0,0) size 784x18
          RenderText {TEXT} at (0,0) size 305x18
            text run at (0,0) width 305: "The paragraph should have a green background."
