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layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (8,8) size 784x584
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          text run at (0,0) width 307: "You should see a 100x100 green square below. "
          text run at (307,0) width 274: "If you see any red, then the test has failed. "
          text run at (581,0) width 197: "This test is ensuring that boxes"
          text run at (0,19) width 334: "can act as containing blocks for positioned elements."
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