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layer at (0,0) size 800x98
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    RenderBody {BODY} at (8,13) size 784x77
      RenderBlock {PRE} at (0,0) size 784x20 [border: (2px solid #008000)]
        RenderText {#text} at (2,2) size 136x16
          text run at (2,2) width 136: "I am on one line."
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        RenderText {#text} at (2,2) size 715x39
          text run at (2,2) width 0: " "
          text run at (2,22) width 715: "This div is two lines.  The newline right after the tag opened is significant and is honored by Firefox and Opera (and us)."