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layer at (0,0) size 800x50
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      RenderBlock {P} at (0,0) size 784x18
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          text run at (0,0) width 367: "This page should have one square green block and no red."
layer at (8,50) size 80x80
  RenderBlock (positioned) {DIV} at (8,50) size 80x80 [bgcolor=#FF0000]
layer at (8,50) size 80x80
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