Clickjacking
Exit
Your Website, Enclosed In An Iframe...
<html>
  <head>
    <style>
      body {
        position: relative;
        margin: 0;
      }

      iframe {
        border: none;
        position: absolute;
        width: 100%;
        height: 100%;
      }
    </style>
  </head>
  <body>
    <iframe src="www.kittens.com/vacuum-revenge">
    </iframe>
  </body>
</html>
...With A Transparent DIV Overlaid...
<html>
  <head>
    <style>
      body {
        position: relative;
        margin: 0;
      }

      iframe, div {
        border: none;
        position: absolute;
        width: 100%;
        height: 100%;
      }

      div {
        z-index: 100;
      }
    </style>
  </head>
  <body>
    <iframe src="www.kittens.com/vacuum-revenge">
    </iframe>
    <div></div>
  </body>
</html>