layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x140
  RenderBlock {HTML} at (0,0) size 800x140 [bgcolor=#008000]
    RenderBody {BODY} at (50,50) size 700x40 [bgcolor=#808080]
      RenderBlock {P} at (0,0) size 700x40
        RenderText {#text} at (0,0) size 684x39
          text run at (0,0) width 684: "The document background should be red, and the body gray. The rest of the viewport should be white. The"
          text run at (0,20) width 304: "document and body should have opacity of 0.3."