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layer at (0,0) size 800x72
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      RenderBlock {P} at (0,0) size 784x40
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          text run at (0,0) width 775: "Below, on the right edge of the page, there should be a green square. In the middle of such green square, a black horizontal stripe"
          text run at (0,20) width 587: "should be traversing it and protruding out of it toward the left. There should be no red in this page."
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  RenderBlock (positioned) {DIV} at (664,72) size 128x128 [bgcolor=#FF0000]
    RenderBlock (floating) {SPAN} at (0,0) size 128x128 [bgcolor=#008000]
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        text run at (-128,48) width 256: "XXXXXXXX"