layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x158
  RenderBlock {HTML} at (0,0) size 800x158
    RenderBody {BODY} at (8,16) size 784x134
      RenderBlock {P} at (0,0) size 784x18
        RenderText {#text} at (0,0) size 255x18
          text run at (0,0) width 255: "Test passes if you see a green rectangle."
layer at (8,50) size 100x100 scrollWidth 400 isolatesBlending
  RenderBlock {DIV} at (0,34) size 100x100
layer at (8,50) size 400x20 backgroundClip at (8,50) size 100x100 clip at (8,50) size 100x100 blendMode: difference
  RenderBlock {DIV} at (0,0) size 400x20 [bgcolor=#00FF00]