layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x50
  RenderBlock {HTML} at (0,0) size 800x50
    RenderBody {BODY} at (8,16) size 784x18
      RenderBlock {P} at (0,0) size 784x18
        RenderText {#text} at (0,0) size 367x17
          text run at (0,0) width 367: "This page should have one square green block and no red."
layer at (8,50) size 80x80
  RenderBlock (positioned) {DIV} at (8,50) size 80x80 [bgcolor=#FF0000]
layer at (8,50) size 80x80
  RenderBlock (positioned) {DIV} at (8,50) size 80x80 [bgcolor=#008000]
    RenderBlock {DIV} at (40,80) size 0x0 [bgcolor=#FF0000]