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layer at (0,0) size 800x47
  RenderBlock {HTML} at (0,0) size 800x47
    RenderBody {BODY} at (8,14) size 784x19
      RenderBlock {P} at (0,0) size 784x19 [color=#FFFFFF] [bgcolor=#008000]
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          text run at (0,0) width 244: "This should have a green background."