layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x108
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      RenderBlock {q} at (0,0) size 800x20
        RenderText {#text} at (0,0) size 216x19
          text run at (0,0) width 216: "This a:q element should be unstyled."
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        RenderText {#text} at (0,0) size 293x19
          text run at (0,0) width 293: "This paragraph should have a green background."
      RenderBlock {r} at (0,72) size 800x20 [bgcolor=#00FF00]
        RenderText {#text} at (0,0) size 298x19
          text run at (0,0) width 298: "This b:r element should have a green background."