layer at (0,0) size 800x600
  RenderCanvas at (0,0) size 800x600
layer at (0,0) size 800x130
  RenderBlock {HTML} at (0,0) size 800x58
    RenderBody {BODY} at (8,16) size 784x114
      RenderBlock {P} at (0,0) size 784x18
        RenderText {TEXT} at (0,0) size 367x18
          text run at (0,0) width 367: "This page should have one square green block and no red."
      RenderBlock {DIV} at (0,34) size 80x80 [bgcolor=#FF0000]
      RenderBlock (floating) {DIV} at (0,34) size 80x80 [bgcolor=#008000]
        RenderBlock {DIV} at (40,80) size 0x0 [bgcolor=#FF0000]
