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
      RenderImage {IMG} at (0,0) size 20x20
      RenderText {TEXT} at (20,6) size 221x18
        text run at (20,6) width 221: " This text should only appear once."
