How is this scrolling implemented?

Question

JavaScript

What js library can do this? https://www.bornfight.com/

Answer 1

scrollmagic.io
I dug into their code, the copyrights showed it.
To control animation:
https://greensock.com/docs/search/Animation
They also have the following copyrights in their code (naturally, not just anything, but useful ones):
aerolab.github.io/midnight.js

Answer 2

TweenMax