Originally, the cursor focus would not be on the Username field in the login page.  This resulted in users have to press tab multiple times or click on the Username field before filling in the username.  With the fix, autofocus is added to the Username field so that the Username field is focused by default.

Reloaded the login page, and made sure that cursor / focus is on Username field. 
Ensured login by email is still functional.
Attempted login
Attempted to change focus