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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 784x578
      RenderBlock {P} at (0,0) size 784x19 [color=#008000]
        RenderText {#text} at (0,0) size 377x19
          text run at (0,0) width 377: "This text should be green if viewport width is at least 600px."