The webpage display is incomplete, so I can't log in.

This is a question of compatibility between browsers and web pages. At present, some corporate websites and official webpages are running under IE8 or IE9. Since our current browser is upgraded to IE 10, the user name and password may not be displayed, and the login button will be slightly displayed. You can try clicking the blue sign next to the URL compatibility view. If not, consider the network speed.