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layer at (0,0) size 800x600
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    RenderBody {BODY} at (8,8) size 784x584
      RenderBlock {P} at (0,0) size 784x19
        RenderText {#text} at (0,0) size 221x19
          text run at (0,0) width 221: "Should see a light green rectangle:"
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        RenderImage {IMG} at (0,0) size 100x100
