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layer at (0,0) size 800x600
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    RenderBody {BODY} at (8,8) size 784x584
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        text run at (0,0) width 300: "You should see a 100x100 green square below."
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layer at (50,50) size 100x500 backgroundClip at (50,50) size 100x100 clip at (50,50) size 100x100
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