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layer at (0,0) size 800x80
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    RenderBody {BODY} at (8,14) size 784x52
      RenderBlock {DIV} at (0,0) size 784x52
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          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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            text run at (0,0) width 304: "This line should NOT have a green background."
