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layer at (0,0) size 800x80
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        RenderBlock {P} at (0,0) size 784x19 [bgcolor=#008000]
          RenderText {#text} at (0,0) size 270x19
            text run at (0,0) width 270: "This line should have a green background."
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        RenderBlock {P} at (0,0) size 784x19
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            text run at (0,0) width 304: "This line should NOT have a green background."
