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  RenderCanvas at (0,0) size 800x600
layer at (0,0) size 800x50
  RenderBlock {HTML} at (0,0) size 800x50
    RenderBody {BODY} at (8,8) size 784x34
      RenderBlock {DIV} at (0,0) size 784x17
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          text run at (0,0) width 167: "This should be unstyled."
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          text run at (0,0) width 261: "This should have a green background."