layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x8
  RenderBlock {HTML} at (0,0) size 800x8
    RenderBody {BODY} at (8,8) size 784x0
layer at (20,50) size 200x100
  RenderBlock (positioned) {DIV} at (20,50) size 200x100 [bgcolor=#008000]
layer at (20,50) size 200x100
  RenderIFrame {IFRAME} at (20,50) size 200x100
    layer at (0,0) size 200x100
      RenderView at (0,0) size 200x100
    layer at (0,0) size 200x16
      RenderBlock {HTML} at (0,0) size 200x16
        RenderBody {BODY} at (8,16) size 184x0
          RenderBlock {P} at (0,0) size 184x0
