Apr 16
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That reading progress bar. Those fade-ins. The scroll-driven effects you've been building with 50 lines of JavaScript? One line of CSS now does all of it — and it runs on the GPU. In this video, we cover the full CSS Scroll-Driven Animations API: the difference between transitions and animations, why JS scroll listeners cause jank, how animation-timeline works, scroll() vs view(), Disney animation principles for UI, and a complete 4-step refactor from old JavaScript to modern CSS. Zero JavaScript. GPU-accelerated. Native browser API. ──────────────────────────────── 🕐 CHAPTERS 00:00 Intro – The Problem with Old Web Animations 00:48 CSS Basics: Transitions vs Animations 01:56 The Old Way: Scroll Event Listeners & Jank 03:06 The Hero: CSS Scroll-Driven Animations API 03:47 scroll() vs view() – The Two Main Tools 04:14 CSS vs JavaScript: Code & Performance Comparison 05:01 Animation Principles from Disney (Squash, Stretch & Easing) 06:03 The Golden Rule: Animate Transform & Opacity Only 06:27 How to Refactor Your Old JS Code – 4-Step Plan 07:00 Final Checklist Before You Ship 07:22 Wrap-Up & What to Build Next ──────────────────────────────── 📌 What you'll learn → CSS transitions vs @keyframes animations — when to use each → Why JS scroll listeners block the main thread and cause jank → animation-timeline: scroll() for reading progress bars → animation-timeline: view() for fade-in-on-scroll effects → animation-range — precise control over when animations fire → Squash & stretch, easing, and Disney motion principles for UI → How to animate only transform & opacity for GPU acceleration → A complete refactor from JS scroll listeners to pure CSS ──────────────────────────────── 🔗 Resources CSS Scroll-Driven Animations spec → https://developer.mozilla.org/en-US/docs/Web/CSS/animation-timeline Browser support → https://caniuse.com/css-scroll-driven-animations ──────────────────────────────── #css #webanimations #frontenddevelopment #cssanimations #scrollanimations #animationtimeline #modernCSS #webdevelopment #javascriptfree #GPUanimations #cssscroll #frontend #htmlcss #webdesign #cssmagic