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          text run at (0,0) width 506: "You should see a green cross below (300 pixels wide and 300 pixels tall). "
          text run at (506,0) width 270: "This is a test to ensure that boxes don't"
          text run at (0,17) width 767: "obey the overconstraint correction (margin-top/bottom should not be corrected when a box is overconstrained)."
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