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 238x17
          text run at (0,0) width 238: "There should be no red visible below."
      RenderBlock {DIV} at (0,18) size 520x0
        RenderBlock (floating) {DIV} at (0,0) size 520x356 [bgcolor=#FF0000]
layer at (8,26) size 520x356
  RenderBlock (floating) {DIV} at (0,0) size 520x356 [bgcolor=#008000]