I copied the markup/css/scripts into my own pen using these 2 libraries https://cdnjs.cloudflare.com/ajax/libs/gsap/3.7.1/gsap.min.js https://cdnjs.cloudflare.com/ajax/libs/gsap/3.7.1/EasePack.min.js
The getratio method doesn't seem to exist in gsap3. How would i get this demo to work... with the 3.7.1 library?
working tutorial demo. https://codepen.io/GreenSock/pen/NyXBbV
My pen with new library.