layer at (0,0) size 800x1200
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x1200
  RenderBlock {HTML} at (0,0) size 800x1200
    RenderBody {BODY} at (0,0) size 800x1200
      RenderBlock {DIV} at (0,0) size 800x200 [bgcolor=#FF0000]
      RenderBlock {DIV} at (0,200) size 800x1000 [bgcolor=#008000]
layer at (0,0) size 800x100
  RenderBlock (positioned) {DIV} at (0,0) size 800x100 [bgcolor=#000000]