Straw Proposal: new input markup
<input type="identity-url">
<input type="identity-email"> <input type="password" pwtype="sign-in">- change password
<input type="password" pwtype="sign-in"> <input type="password" pwtype="create"> <input type="password" pwtype="confirm"> - sign-up
<input type="identity-email"> <input type="password" pwtype="create"> <input type="password" pwtype="confirm"> - stay
<input type="identity-url" readonly> <input type="password" pwtype="sign-in"> <input type="checkbox" rememberme>