High five to the Greensock gang for the ScrollTrigger release. The point of this new plugin is triggering animation when a page scrolls to certain positions, as well as when certain elements are in the viewport. Anything you’d want configurable about it, is. There’s been plenty of scroll-position libraries over the years, but Greensock has a knack for getting the APIs and performance just right — not to mention that because what you want is to trigger animations, now you’ve got Greensock at your fingertips making sure you’re in good hands. It’s tightly integrated with all the other animation possibilities of GSAP (e.g. animating a timeline based on scroll position).
They’ve got docs and a bunch of examples. I particularly like how they have a mistakes section with ways you can screw it up. Every project should do that.
CodePen is full of examples too, so I’ll take the opportunity to drop some here for your viewing pleasure. Note that while this is a paid plugin, you can play with it on CodePen for free (search for it).
If you’re worried about too much motion, that’s something that you can do responsibly through prefers-reduced-motion, which is available both as a CSS media query and in JavaScript.
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