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  RenderView 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
      RenderBlock {P} at (0,0) size 784x20
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          text run at (0,0) width 441: "You should see a green rectangle with a rounded black border below."
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  RenderBlock {DIV} at (0,36) size 320x320 [bgcolor=#FF0000] [border: (10px solid #000000)]
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