layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x213
  RenderBlock {HTML} at (0,0) size 800x213
    RenderBody {BODY} at (8,16) size 784x189
      RenderBlock {P} at (0,0) size 784x18
        RenderText {#text} at (0,0) size 400x18
          text run at (0,0) width 400: "The square below should be exactly 50 pixels high on the ruler."
      RenderBlock {DIV} at (0,34) size 784x155
        RenderImage {IMG} at (45,0) size 50x50