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          text run at (0,0) width 137: "You should see a 300"
          text run at (137,0) width 183: "x100 green rectangle below. "
          text run at (320,0) width 464: "If you see any red, the test has failed. This test makes a positioned vertical"
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          text run at (636,18) width 136: "Box-align of center is"
          text run at (0,36) width 339: "used to align the second child in the center of the box."
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