How to trigger animation on scroll in JavaScript?

Question

I have made a website with custom animations but I want to to trigger those animations only when the user scrolls down

Answer 1

Sujeet Kumar here is one way with fade and ipfffo 's gave another good example... As you gain more experience you will discover several ways to trigger and animate
https://code.sololearn.com/WGjuY4sFPP9F/?ref=app

Answer 2

https://lmgtfy.com/?q=How+to+trigger+animation+on+scroll+in+JavaScript%3F