layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (0,0) size 800x600
layer at (48,72) size 120x120
  RenderBlock (positioned) {DIV} at (48,72) size 120x120 [bgcolor=#FF0000]
layer at (48,72) size 120x120
  RenderBlock (positioned) {DIV} at (48,72) size 120x120 [bgcolor=#008000]