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              text run at (0,0) width 313: "This teal box should start inside the dark blue box"
              text run at (0,18) width 81: "and spill out "
              text run at (81,18) width 171: "onto the blue area below it."
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            text run at (0,0) width 251: "You should see a teal box to the right. \x{21E8}"