This is not a real login page. But it demonstrates how easy login can be when using a U2F security key, such as the new USBAuth Token from Akisec.

The U2F standard can remove the need for passwords, which we all know are a huge challenge in so many different ways. However, in the short term, most sites will still require a password before they check your U2F security key. It's perfectly safe to login with just the U2F security key because they simply cannot be copied.