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          text run at (0,0) width 137: "You should see a 100"
          text run at (137,0) width 167: "x100 green square below. "
          text run at (304,0) width 268: "If you see any red, then the test has failed. "
          text run at (572,0) width 193: "This test is ensuring that boxes"
          text run at (0,18) width 330: "can act as containing blocks for positioned elements."
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