Scroll Trigger Story

Code

body { margin: 0; background: #060b13; color: #f2f6fe; font-family: "Avenir Next", sans-serif; }
.back { position: fixed; top: 14px; left: 14px; color: #86e8ff; text-decoration: none; z-index: 10; }
.panel { min-height: 100vh; width: min(900px, 92%); margin: 0 auto; display: grid; align-content: center; gap: .7rem; border-bottom: 1px solid #24314a; }
h1,h2,p { margin: 0; }
p { color: #c1cde1; max-width: 60ch; }

if (!window.MotionPreference) {
  const __mql = window.matchMedia("(prefers-reduced-motion: reduce)");
  const __listeners = new Set();

  const MotionPreference = {
    prefersReducedMotion() {
      return __mql.matches;
    },
    setOverride(value) {
      const reduced = Boolean(value);
      document.documentElement.classList.toggle("reduced-motion", reduced);
      window.dispatchEvent(new CustomEvent("motion-preference", { detail: { reduced } }));
      for (const listener of __listeners) {
        try {
          listener({ reduced, override: reduced, systemReduced: __mql.matches });
        } catch {}
      }
    },
    onChange(listener) {
      __listeners.add(listener);
      try {
        listener({
          reduced: __mql.matches,
          override: null,
          systemReduced: __mql.matches,
        });
      } catch {}
      return () => __listeners.delete(listener);
    },
    getState() {
      return { reduced: __mql.matches, override: null, systemReduced: __mql.matches };
    },
  };

  window.MotionPreference = MotionPreference;
}

if (!window.MotionPreference.prefersReducedMotion() && window.gsap && window.ScrollTrigger) {
  window.gsap.registerPlugin(window.ScrollTrigger);
  window.gsap.utils.toArray(".scroll-reveal-section").forEach((panel) => {
    window.gsap.fromTo(panel, { y: 80, opacity: 0.15 }, {
      y: 0,
      opacity: 1,
      ease: "power2.out",
      scrollTrigger: { trigger: panel, start: "top 82%", end: "top 35%", scrub: 1 }
    });
  });
}

<!doctype html>
<html lang="en"><head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Demo 03 - Scroll Story</title><link rel="stylesheet" href="style.css" /></head>
<body>
<a class="back" href="../">Back</a>
<main>
  <section class="panel scroll-reveal-section"><h1>Scroll Story</h1><p>Reveal each panel as it enters viewport.</p></section>
  <section class="panel scroll-reveal-section"><h2>Act I</h2><p>Set context with atmosphere and typography.</p></section>
  <section class="panel scroll-reveal-section"><h2>Act II</h2><p>Increase depth and motion rhythm.</p></section>
  <section class="panel scroll-reveal-section"><h2>Act III</h2><p>Resolve to CTA with cleaner composition.</p></section>
</main>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.12.5/dist/gsap.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.12.5/dist/ScrollTrigger.min.js"></script>
<script src="script.js"></script>
    </body></html>

Section-by-section storytelling using viewport-triggered reveals.

Source

Repository: libs-gen
Original demo id: 03-scroll-trigger-story

Notes

Section-by-section storytelling using viewport-triggered reveals.