In recent times it has been common to find animated sites based on page scrolling. But, unlike the result of a WOW.js of life for example, if you scroll, let the effect run, scroll to another section of the page and return to the previous place, the effect is executed again.
As well you can find elements that move as you scroll the page.
Does anyone have any SPECIFIC reference material for the study of this type of animation?
Thank you:)