{"id":"94d5d73a-7fe4-4987-9f02-e7dcd0146937","shortId":"wYVUE5","kind":"skill","title":"Scroll Experience","tagline":"Antigravity Awesome Skills skill by Sickn33","description":"# Scroll Experience\n\nExpert in building immersive scroll-driven experiences - parallax storytelling,\nscroll animations, interactive narratives, and cinematic web experiences. Like\nNY Times interactives, Apple product pages, and award-winning web experiences.\nMakes websites feel like experiences, not just pages.\n\n**Role**: Scroll Experience Architect\n\nYou see scrolling as a narrative device, not just navigation. You create\nmoments of delight as users scroll. You know when to use subtle animations\nand when to go cinematic. You balance performance with visual impact. You\nmake websites feel like movies you control with your thumb.\n\n### Expertise\n\n- Scroll animations\n- Parallax effects\n- GSAP ScrollTrigger\n- Framer Motion\n- Performance optimization\n- Storytelling through scroll\n\n## Capabilities\n\n- Scroll-driven animations\n- Parallax storytelling\n- Interactive narratives\n- Cinematic web experiences\n- Scroll-triggered reveals\n- Progress indicators\n- Sticky sections\n- Scroll snapping\n\n## Patterns\n\n### Scroll Animation Stack\n\nTools and techniques for scroll animations\n\n**When to use**: When planning scroll-driven experiences\n\n## Scroll Animation Stack\n\n### Library Options\n| Library | Best For | Learning Curve |\n|---------|----------|----------------|\n| GSAP ScrollTrigger | Complex animations | Medium |\n| Framer Motion | React projects | Low |\n| Locomotive Scroll | Smooth scroll + parallax | Medium |\n| Lenis | Smooth scroll only | Low |\n| CSS scroll-timeline | Simple, native | Low |\n\n### GSAP ScrollTrigger Setup\n```javascript\nimport { gsap } from 'gsap';\nimport { ScrollTrigger } from 'gsap/ScrollTrigger';\n\ngsap.registerPlugin(ScrollTrigger);\n\n// Basic scroll animation\ngsap.to('.element', {\n  scrollTrigger: {\n    trigger: '.element',\n    start: 'top center',\n    end: 'bottom center',\n    scrub: true, // Links animation to scroll position\n  },\n  y: -100,\n  opacity: 1,\n});\n```\n\n### Framer Motion Scroll\n```jsx\nimport { motion, useScroll, useTransform } from 'framer-motion';\n\nfunction ParallaxSection() {\n  const { scrollYProgress } = useScroll();\n  const y = useTransform(scrollYProgress, [0, 1], [0, -200]);\n\n  return (\n    <motion.div style={{ y }}>\n      Content moves with scroll\n    </motion.div>\n  );\n}\n```\n\n### CSS Native (2024+)\n```css\n@keyframes reveal {\n  from { opacity: 0; transform: translateY(50px); }\n  to { opacity: 1; transform: translateY(0); }\n}\n\n.animate-on-scroll {\n  animation: reveal linear;\n  animation-timeline: view();\n  animation-range: entry 0% cover 40%;\n}\n```\n\n### Parallax Storytelling\n\nTell stories through scroll depth\n\n**When to use**: When creating narrative experiences\n\n## Parallax Storytelling\n\n### Layer Speeds\n| Layer | Speed | Effect |\n|-------|-------|--------|\n| Background | 0.2x | Far away, slow |\n| Midground | 0.5x | Middle depth |\n| Foreground | 1.0x | Normal scroll |\n| Content | 1.0x | Readable |\n| Floating elements | 1.2x | Pop forward |\n\n### Creating Depth\n```javascript\n// GSAP parallax layers\ngsap.to('.background', {\n  scrollTrigger: {\n    scrub: true\n  },\n  y: '-20%', // Moves slower\n});\n\ngsap.to('.foreground', {\n  scrollTrigger: {\n    scrub: true\n  },\n  y: '-50%', // Moves faster\n});\n```\n\n### Story Beats\n```\nSection 1: Hook (full viewport, striking visual)\n    ↓ scroll\nSection 2: Context (text + supporting visuals)\n    ↓ scroll\nSection 3: Journey (parallax storytelling)\n    ↓ scroll\nSection 4: Climax (dramatic reveal)\n    ↓ scroll\nSection 5: Resolution (CTA or conclusion)\n```\n\n### Text Reveals\n- Fade in on scroll\n- Typewriter effect on trigger\n- Word-by-word highlight\n- Sticky text with changing visuals\n\n### Sticky Sections\n\nPin elements while scrolling through content\n\n**When to use**: When content should stay visible during scroll\n\n## Sticky Sections\n\n### CSS Sticky\n```css\n.sticky-container {\n  height: 300vh; /* Space for scrolling */\n}\n\n.sticky-element {\n  position: sticky;\n  top: 0;\n  height: 100vh;\n}\n```\n\n### GSAP Pin\n```javascript\ngsap.to('.content', {\n  scrollTrigger: {\n    trigger: '.section',\n    pin: true, // Pins the section\n    start: 'top top',\n    end: '+=1000', // Pin for 1000px of scroll\n    scrub: true,\n  },\n  // Animate while pinned\n  x: '-100vw',\n});\n```\n\n### Horizontal Scroll Section\n```javascript\nconst sections = gsap.utils.toArray('.panel');\n\ngsap.to(sections, {\n  xPercent: -100 * (sections.length - 1),\n  ease: 'none',\n  scrollTrigger: {\n    trigger: '.horizontal-container',\n    pin: true,\n    scrub: 1,\n    end: () => '+=' + document.querySelector('.horizontal-container').offsetWidth,\n  },\n});\n```\n\n### Use Cases\n- Product feature walkthrough\n- Before/after comparisons\n- Step-by-step processes\n- Image galleries\n\n### Performance Optimization\n\nKeep scroll experiences smooth\n\n**When to use**: Always - scroll jank kills experiences\n\n## Performance Optimization\n\n### The 60fps Rule\n- Animations must hit 60fps\n- Only animate transform and opacity\n- Use will-change sparingly\n- Test on real mobile devices\n\n### GPU-Friendly Properties\n| Safe to Animate | Avoid Animating |\n|-----------------|-----------------|\n| transform | width/height |\n| opacity | top/left/right/bottom |\n| filter | margin/padding |\n| clip-path | font-size |\n\n### Lazy Loading\n```javascript\n// Only animate when in viewport\nScrollTrigger.create({\n  trigger: '.heavy-section',\n  onEnter: () => initHeavyAnimation(),\n  onLeave: () => destroyHeavyAnimation(),\n});\n```\n\n### Mobile Considerations\n- Reduce parallax intensity\n- Fewer animated layers\n- Consider disabling on low-end\n- Test on throttled CPU\n\n### Debug Tools\n```javascript\n// GSAP markers for debugging\nscrollTrigger: {\n  markers: true, // Shows trigger points\n}\n```\n\n## Sharp Edges\n\n### Animations stutter during scroll\n\nSeverity: HIGH\n\nSituation: Scroll animations aren't smooth 60fps\n\nSymptoms:\n- Choppy animations\n- Laggy scroll\n- CPU spikes during scroll\n- Mobile especially bad\n\nWhy this breaks:\nAnimating wrong properties.\nToo many elements animating.\nHeavy JavaScript on scroll.\nNo GPU acceleration.\n\nRecommended fix:\n\n## Fixing Scroll Jank\n\n### Only Animate These\n```css\n/* GPU-accelerated, smooth */\ntransform: translateX(), translateY(), scale(), rotate()\nopacity: 0 to 1\n\n/* Triggers layout, causes jank */\nwidth, height, top, left, margin, padding\n```\n\n### Force GPU Acceleration\n```css\n.animated-element {\n  will-change: transform;\n  transform: translateZ(0); /* Force GPU layer */\n}\n```\n\n### Throttle Scroll Events\n```javascript\n// Don't do this\nwindow.addEventListener('scroll', heavyFunction);\n\n// Do this instead\nlet ticking = false;\nwindow.addEventListener('scroll', () => {\n  if (!ticking) {\n    requestAnimationFrame(() => {\n      heavyFunction();\n      ticking = false;\n    });\n    ticking = true;\n  }\n});\n\n// Or use GSAP (handles this automatically)\n```\n\n### Debug Performance\n- Chrome DevTools → Performance tab\n- Record scroll, look for red frames\n- Check \"Rendering\" → Paint flashing\n- Profile on mobile device\n\n### Parallax breaks on mobile devices\n\nSeverity: HIGH\n\nSituation: Parallax effects glitch on iOS/Android\n\nSymptoms:\n- Glitchy on iPhone\n- Stuttering on scroll\n- Elements jumping\n- Works on desktop, broken on mobile\n\nWhy this breaks:\nMobile browsers handle scroll differently.\niOS momentum scrolling conflicts.\nTransform during scroll is tricky.\nPerformance varies wildly.\n\nRecommended fix:\n\n## Mobile-Safe Parallax\n\n### Detection\n```javascript\nconst isMobile = /iPhone|iPad|iPod|Android/i.test(navigator.userAgent);\n// Or better: check viewport width\nconst isMobile = window.innerWidth < 768;\n```\n\n### Reduce or Disable\n```javascript\nif (isMobile) {\n  // Simpler animations\n  gsap.to('.element', {\n    scrollTrigger: { scrub: true },\n    y: -50, // Less movement than desktop\n  });\n} else {\n  // Full parallax\n  gsap.to('.element', {\n    scrollTrigger: { scrub: true },\n    y: -200,\n  });\n}\n```\n\n### iOS-Specific Fix\n```css\n/* Helps with iOS scroll issues */\n.scroll-container {\n  -webkit-overflow-scrolling: touch;\n}\n\n.parallax-layer {\n  transform: translate3d(0, 0, 0);\n  backface-visibility: hidden;\n}\n```\n\n### Alternative: CSS Only\n```css\n/* Works better on mobile */\n@supports (animation-timeline: scroll()) {\n  .parallax {\n    animation: parallax linear;\n    animation-timeline: scroll();\n  }\n}\n```\n\n### Scroll experience is inaccessible\n\nSeverity: MEDIUM\n\nSituation: Screen readers and keyboard users can't use the site\n\nSymptoms:\n- Failed accessibility audit\n- Can't navigate with keyboard\n- Screen reader doesn't work\n- Vestibular disorder complaints\n\nWhy this breaks:\nAnimations hide content.\nScroll hijacking breaks navigation.\nNo reduced motion support.\nFocus management ignored.\n\nRecommended fix:\n\n## Accessible Scroll Experiences\n\n### Respect Reduced Motion\n```css\n@media (prefers-reduced-motion: reduce) {\n  *, *::before, *::after {\n    animation-duration: 0.01ms !important;\n    transition-duration: 0.01ms !important;\n    scroll-behavior: auto !important;\n  }\n}\n```\n\n```javascript\nconst prefersReducedMotion = window.matchMedia(\n  '(prefers-reduced-motion: reduce)'\n).matches;\n\nif (!prefersReducedMotion) {\n  initScrollAnimations();\n}\n```\n\n### Content Always Accessible\n- Don't hide content behind animations\n- Ensure text is readable without JS\n- Provide skip links\n- Test with screen reader\n\n### Keyboard Navigation\n```javascript\n// Ensure scroll sections are keyboard navigable\ndocument.querySelectorAll('.scroll-section').forEach(section => {\n  section.setAttribute('tabindex', '0');\n});\n```\n\n### Critical content hidden below animations\n\nSeverity: MEDIUM\n\nSituation: Users have to scroll through animations to find content\n\nSymptoms:\n- High bounce rate\n- Low time on page (paradoxically)\n- SEO ranking issues\n- User complaints about finding info\n\nWhy this breaks:\nPrioritized experience over content.\nLong scroll to reach info.\nSEO suffering.\nMobile users bounce.\n\nRecommended fix:\n\n## Content-First Scroll Design\n\n### Above-the-Fold Content\n- Key message visible immediately\n- CTA visible without scroll\n- Value proposition clear\n- Skip animation option\n\n### Progressive Enhancement\n```\nLevel 1: Content readable without JS\nLevel 2: Basic styling and layout\nLevel 3: Scroll animations enhance\n```\n\n### SEO Considerations\n- Text in DOM, not just in canvas\n- Proper heading hierarchy\n- Content not hidden by default\n- Fast initial load\n\n### Quick Exit Points\n- Clear navigation always visible\n- Skip to content links\n- Don't trap users in experience\n\n## Validation Checks\n\n### No Reduced Motion Support\n\nSeverity: HIGH\n\nMessage: Not respecting reduced motion preference - accessibility issue.\n\nFix action: Add prefers-reduced-motion media query to disable/reduce animations\n\n### Unthrottled Scroll Events\n\nSeverity: MEDIUM\n\nMessage: Scroll events may not be throttled - potential jank.\n\nFix action: Use requestAnimationFrame or GSAP ScrollTrigger for smooth performance\n\n### Animating Layout-Triggering Properties\n\nSeverity: MEDIUM\n\nMessage: Animating layout properties causes jank.\n\nFix action: Use transform (translate, scale) and opacity instead\n\n### Missing will-change Optimization\n\nSeverity: LOW\n\nMessage: Consider adding will-change for heavy animations.\n\nFix action: Add will-change: transform to frequently animated elements\n\n### Scroll Hijacking Detected\n\nSeverity: MEDIUM\n\nMessage: May be hijacking scroll behavior.\n\nFix action: Let users scroll naturally, use scrub animations instead\n\n## Collaboration\n\n### Delegation Triggers\n\n- 3D|WebGL|three.js|spline -> 3d-web-experience (3D elements in scroll experience)\n- react|vue|next|framework -> frontend (Frontend implementation)\n- performance|slow|optimize -> performance-hunter (Performance optimization)\n- design|mockup|visual -> ui-design (Visual design)\n\n### Immersive Product Page\n\nSkills: scroll-experience, 3d-web-experience, landing-page-design\n\nWorkflow:\n\n```\n1. Design product story structure\n2. Create 3D product model\n3. Build scroll-driven reveals\n4. Add conversion points\n5. Optimize performance\n```\n\n### Interactive Story\n\nSkills: scroll-experience, ui-design, frontend\n\nWorkflow:\n\n```\n1. Write story/content\n2. Design visual sections\n3. Plan scroll animations\n4. Implement with GSAP/Framer\n5. Test and optimize\n```\n\n## Related Skills\n\nWorks well with: `3d-web-experience`, `frontend`, `ui-design`, `landing-page-design`\n\n## When to Use\n- User mentions or implies: scroll animation\n- User mentions or implies: parallax\n- User mentions or implies: scroll storytelling\n- User mentions or implies: interactive story\n- User mentions or implies: cinematic website\n- User mentions or implies: scroll experience\n- User mentions or implies: immersive web\n\n## Limitations\n- Use this skill only when the task clearly matches the scope described above.\n- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.\n- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are 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