If you are using safari to browse internet from iPhone X this would be a great tip for you.
Now you can auto fill your usernames and passwords without wasting time.
All you need to do is follow below steps.

First go to settings.
Then select safari.
There you need to select auto filtering.
Turn this on.
Now each time you get an interface to login , it will ask you for auto filtering.
Then after face recognition it will auto filter.