With Internet Explorer 11, we’ve done work to make signing into sites faster and more reliable as well as give users more control when saving credentials. In addition, IE11 will now roam credentials to IE11 on Windows Phone 8.1!
We are giving control back to the user when deciding to save passwords on a given site. IE11 will now prompt the user to save passwords even if the autocomplete=off attribute is set on login forms.
Source : IEBlog
