What problem does it solve? Building scroll-driven animations—triggering tweens on scroll, pinning sections, scrubbing timelines to scroll position, or creating fake horizontal scroll—requires precise ScrollTrigger configuration, and common mistakes (wrong ease, missing refresh, misordered triggers) break layouts. ## Core Features & Use Cases - Scroll-Linked Animation: Tie tweens and timelines to scroll position with start/end triggers, toggleActions, and scrub for direct scroll-driven progress. - Pinning & Horizontal Scroll: Pin sections during scroll ranges and build fake horizontal scroll using containerAnimation with the required ease: "none" pattern. - Batching & Custom Scrollers: Use ScrollTrigger.batch() for staggered viewport reveals and scrollerProxy() to integrate third-party smooth-scroll libraries. - Use Case: A developer building a landing page wants a section pinned while content slides horizontally as the user scrolls vertically; this Skill provides the exact pinned containerAnimation pattern plus cleanup and refresh best practices. ## Quick Start Ask the AI to create a GSAP ScrollTrigger animation that pins a section and scrubs a timeline as the user scrolls.