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        text run at (0,0) width 304: "You should see a 100x100 green square below. "
        text run at (304,0) width 237: "If you see any red, the test has failed. "
        text run at (541,0) width 212: "This test is checking to make sure"
        text run at (0,18) width 148: "overflow is done using "
        text run at (148,18) width 167: "a containing block model. "
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