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 (8,8) size 784x584
      RenderBlock (anonymous) at (0,0) size 784x18
        RenderText {#text} at (0,0) size 240x18
          text run at (0,0) width 240: "You should see a green square below."
layer at (8,26) size 100x100
  RenderBlock (relative positioned) {DIV} at (0,18) size 100x100 [bgcolor=#FF0000]
layer at (8,26) size 100x100
  RenderBlock (positioned) {DIV} at (0,0) size 100x100
layer at (8,26) size 100x100
  RenderBlock (positioned) {DIV} at (0,0) size 100x100
layer at (8,26) size 100x100
  RenderBlock (positioned) zI: 100 {DIV} at (0,0) size 100x100
layer at (8,26) size 100x100
  RenderBlock (positioned) zI: 1000 {DIV} at (0,0) size 100x100 [bgcolor=#008000]
