layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x0
  RenderBlock {HTML} at (0,0) size 800x0
    RenderBody {BODY} at (0,0) size 800x0
layer at (120,120) size 200x200
  RenderBlock (positioned) {DIV} at (120,120) size 200x200 [bgcolor=#FF0000]
layer at (0,100) size 240x244
  RenderBlock (positioned) {DIV} at (0,100) size 240x244
    RenderText {#text} at (0,0) size 0x0
layer at (10,110) size 220x220
  RenderIFrame {IFRAME} at (10,10) size 220x220
    layer at (0,0) size 200x400
      RenderView at (0,0) size 200x200
    layer at (0,0) size 200x400
      RenderBlock {HTML} at (0,0) size 200x400
        RenderBody {BODY} at (0,0) size 200x400
          RenderBlock {DIV} at (0,0) size 200x200 [bgcolor=#FF0000]
          RenderBlock {DIV} at (0,200) size 200x200 [bgcolor=#008000]