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          text run at (0,0) width 778: "Below there should be a green square. In the middle of such green square, a black horizontal stripe should be traversing it"
          text run at (0,18) width 493: "and protruding out of it toward the right. There should be no red in this page."
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        LayoutBlockFlow {SPAN} at (0,0) size 128x128 [bgcolor=#008000]
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            text run at (0,48) width 256: "XXXXXXXX"