layer at (0,0) size 800x600
  RenderCanvas at (0,0) size 800x600
layer at (0,0) size 800x322
  RenderBlock {HTML} at (0,0) size 800x322
    RenderBody {BODY} at (8,8) size 784x306
      RenderBlock {DIV} at (0,0) size 784x306
        RenderText {TEXT} at (155,136) size 173x17
          text run at (155,136) width 173: "This should be centered. "
        RenderPartObject {IFRAME} at (328,0) size 300x150
          layer at (0,0) size 8x8
            RenderCanvas at (0,0) size 0x0
          layer at (0,0) size 8x8
            RenderBlock {HTML} at (0,0) size 0x8
              RenderBody {BODY} at (8,8) size 0x0 [bgcolor=#FF0000]
        RenderBR {BR} at (0,0) size 0x0
        RenderText {TEXT} at (155,289) size 173x17
          text run at (155,289) width 173: "This should be centered. "
        RenderPartObject {OBJECT} at (328,153) size 300x150
          layer at (0,0) size 8x8
            RenderCanvas at (0,0) size 0x0
          layer at (0,0) size 8x8
            RenderBlock {HTML} at (0,0) size 0x8
              RenderBody {BODY} at (8,8) size 0x0 [bgcolor=#FF0000]
        RenderBR {BR} at (0,0) size 0x0
        RenderText {TEXT} at (0,0) size 0x0
