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  RenderView at (0,0) size 800x600
layer at (0,0) size 800x50
  RenderBlock {html} at (0,0) size 800x50 [bgcolor=#00FF00]
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      RenderBlock {p} at (0,0) size 784x18
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          text run at (0,0) width 318: "The background of the document should be green"