layer at (0,0) size 800x600
  RenderCanvas at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (8,8) size 784x584
      RenderText {TEXT} at (0,0) size 300x18
        text run at (0,0) width 137: "You should see a 100"
        text run at (137,0) width 163: "x100 green square below."
      RenderText {TEXT} at (0,0) size 0x0
      RenderText {TEXT} at (0,0) size 0x0
layer at (50,50) size 100x500 backgroundClip at (50,50) size 100x100 clip at (50,50) size 100x100
  RenderBlock (positioned) {DIV} at (50,50) size 100x500 [bgcolor=#008000]