When the pinned element gets unpinned, the content below/right will have caught up. By default, padding will be added to the bottom (or right for horizontal: true) of the pin-spacer so that things get pushed further down/right.Think of it like a proxy element that props open the space where the pinned element was in the DOM so that when it flips to position: fixed things don't collapse. A class of "pin-spacer" is added to that wrapper. The pinned element gets immediately wrapped in a with a fixed width/height to match.You can certainly use IntersectionObserver and ScrollTrigger together. ScrollTrigger does not use IntersectionObserver under the hood because it lacks the necessary functionality and compatibility. It does let you watch multiple elements and have a single callback triggered that could loop through and fire a staggered animation on just the elements that entered, for example.It's not helpful for tracking an element's position between two points, like for scrubbing an animation accordingly.It constantly "watches" elements to sense when they enter/leave regardless of scrolling.IntersectionObserver is a native feature in most modern browsers that's different in the following ways: Yeah, we looked for every opportunity to maximize performance. In fact, since resizing/refreshing is CPU-intensive, it waits until there's a 200ms gap in resize events before starting its work. ScrollTrigger automatically listens for viewport/scroller "resize" events and recalculates all the start/end positions accordingly ( onRefresh). ![]() Then, it debounces the "scroll" events and only updates things on the next requestAnimationFrame, perfectly synced with GSAP and screen refreshes. In other words, "this ScrollTrigger will be active when the scrollbar is between _ and _". Instead, ScrollTrigger does the processing up-front to figure out where the start/end points are in the natural document flow. We're obsessed with performance and that'd be far too costly. ScrollTrigger does NOT constantly watch every element and check its positioning in the viewport on each tick. How does ScrollTrigger work? Is it just like IntersectionObserver? ScrollSmoother is a members-only benefit of Club GreenSock. Built on native scroll technology, it avoids most of the accessibility issues that plague other smooth-scrolling libraries. GreenSock's own ScrollSmoother tool is built on top of ScrollTrigger, so it is totally integrated and super easy to use. panel element with pinReparent: true because during the pin, it would no longer be inside the, so make sure you write your CSS rules to accommodate the reparenting. SnapTo : "labels", // snap to the closest label in the timelineĭuration : wouldn't apply to the nested anymore if you pin the. Scrub : 1, // smooth scrubbing, takes 1 second to "catch up" to the scrollbar Start : "top top", // when the top of the trigger hits the top of the viewportĮnd : "+=500", // end after scrolling 500px beyond the start Pin : true, // pin the trigger element while active yes, we can add it to an entire timeline!
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