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layer at (0,0) size 800x600
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      RenderBlock {P} at (0,0) size 784x21
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          text run at (0,0) width 379: "You should see a single 100x100 green block below. "
          text run at (379,0) width 261: "If you see any red, the test has failed."
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        RenderBlock (floating) {LI} at (100,0) size 100x100 [bgcolor=#FF0000]
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