layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x52
  RenderBlock {HTML} at (0,0) size 800x52
    RenderBody {BODY} at (8,16) size 784x20
      RenderBlock {P} at (0,0) size 784x20
        RenderInline (pseudo:before) at (0,0) size 173x19 [bgcolor=#00FF00]
          RenderTextFragment at (0,0) size 173x19
            text run at (0,0) width 173: "GENERATED CONTENT "
        RenderText {#text} at (173,0) size 606x19
          text run at (173,0) width 606: "You should see before this paragraph the words GENERATED CONTENT over green background"