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  RenderView at (0,0) size 800x600
layer at (0,0) size 800x96
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    RenderBody {BODY} at (8,13) size 784x75
      RenderBlock {PRE} at (0,0) size 784x18 [border: (2px solid #008000)]
        RenderText {#text} at (2,2) size 133x14
          text run at (2,2) width 133: "I am on one line."
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        RenderText {#text} at (2,2) size 772x39
          text run at (2,2) width 0: " "
          text run at (2,22) width 772: "This div is two lines.  The newline right after the tag opened is significant and is honored by Firefox and Opera (and us)."