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layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
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          text run at (0,0) width 765: "This test passes if the div below is a blue 100px square when the deviceScaleFactor is 1, and if it is a 100px green square when"
          text run at (0,20) width 782: "the deviceScaleFactor is 2. When run in the test harness, this test is distinct from image-set-as-background, because it ensures that"
          text run at (0,40) width 391: "the green image loads dynamically when the scale factor changes."
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