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layer at (0,0) size 800x600
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          text run at (0,0) width 293: "You should see a 100x100 green square below. "
          text run at (293,0) width 256: "If you see any red, then the test has failed. "
          text run at (549,0) width 229: "This test is ensuring that boxes can act"
          text run at (0,20) width 268: "as containing blocks for positioned elements."
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