Untitled

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
  </head>
  <body>
    <iframe name="preview" id="preview" src="javascript:var d=document.open();d.domain='example.com';d.close();void(0);" frameborder="0" height="100%" width="100%" allowfullscreen="true" allowtransparency="true"/>
  </body>
</html>