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layer at (0,0) size 800x600
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    RenderBody {BODY} at (0,0) size 800x600
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              RenderText {#text} at (2,2) size 451x17
                text run at (2,2) width 451: "There should be a gap between this float and the green rectangle above."
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            text run at (0,0) width 483: "This text should be inside a black rectangle and below the 2em white square."
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            text run at (0,0) width 512: "This text should also be inside a black rectangle and below the 2em white square."