layer at (0,0) size 800x600
  RenderCanvas at (0,0) size 800x600
layer at (0,0) size 800x62
  RenderBlock {HTML} at (0,0) size 800x62
    RenderBody {BODY} at (8,8) size 784x38
      RenderBlock {P} at (0,0) size 784x38 [border: (10px solid #008000)]
        RenderText {TEXT} at (10,10) size 299x18
          text run at (10,10) width 299: "I should be surrounded by a thick green border."
