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layer at (0,0) size 800x600
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          text run at (0,0) width 339: "You should see a single 100x100 green block below. "
          text run at (339,0) width 233: "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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