ScrollTrigger triggers classes on html elements based on the scroll position. It makes use of requestAnimationFrame so it doesn’t jack the users scroll, that way the user / browser keeps their original scroll behaviour. Animations run when the browser is ready for it. All animations are triggered by classes, so you can take advantage of the power that CSS3 animations give you.
ScrollTrigger offers a range of options, from calling custom JavaScript functions to defining custom offsets and classes. ScrollTrigger supports both vertical and horizontal scrolling.
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