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  RenderView at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (8,8) size 784x584
      RenderBlock {DIV} at (0,0) size 784x178 [border: (80px solid #FF0000)]
        RenderText {#text} at (80,80) size 212x17
          text run at (80,80) width 212: "This border should be 5em thick."
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        RenderText {#text} at (0,0) size 100x35
          text run at (0,0) width 100: "This div should"
          text run at (0,18) width 99: "be 100px wide."