一些浏览器并不align autocomplete, 可以额外 加一个透明的 password 和user name 的输入框。
那样你就会得到如下的 console 警告：
[DOM] Multiple forms should be contained in their own form elements; break up complex forms into ones that represent a single action: (More info: https://goo.gl/9p2vKq)
