Don't do this. Will break password managers, like http://www.lastpass.com http://www.lastpass.com, with little upside. On second note, would not putting 2 fie

Don't do this. Will break password managers, like http://www.lastpass.com http://www.lastpass.com, with little upside. On second note, would not putting 2 fields in one line, and having space switch from username to password in JS achieve the same thing similar benefits without the drawbacks?