Proto.io Sample "Smoothies to Door" field types?

I downloaded and inspected the demo "Smoothies to Door" prototype to reverse engineer some of the animations and functionality.

I noticed on the screens "Sign Up" and "Sign In", I cannot find the field type of "User Name", "Password", or "Email", in which the placeholder text is animated and moves once the user enters data in those fields.

Can anyone identify what subset of fields this particular field is a part of?

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