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          text run at (0,0) width 468: "You should see a green cross below (300 pixels wide and 300 pixels tall). "
          text run at (468,0) width 300: "This is a test to ensure that boxes don't obey the"
          text run at (0,18) width 638: "overconstraint correction (margin-top/bottom should not be corrected when a box is overconstrained)."
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