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          text run at (0,0) width 147: "You should see a 100"
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          text run at (330,0) width 296: "If you see any red, then the test has failed. "
          text run at (626,0) width 139: "This test is ensuring"
          text run at (0,17) width 439: "that boxes can act as containing blocks for positioned elements."
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