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layer at (0,0) size 228x600
  RenderBlock {HTML} at (0,0) size 228x600
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      RenderBlock (anonymous) at (0,0) size 20x584
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          text run at (0,0) width 261: "You should see a green rectangle below. "
          text run at (0,260) width 239: "If you see any red, the test has failed."
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