<!-- The following form element glues pseudo-login data together, so that password managers can try to look up stored value pairs.
The username field is made hidden, because I found that otherwise password managers will fill in data into the password field.
See https://developer.mozilla.org/en-US/docs/Web/Security/Securing_your_site/Turning_off_form_autocompletion#The_autocomplete_attribute_and_login_fields