Smooth Page Transitions with View Transitions API

Sat, 05 Apr 2025 00:00:00 +0900

Introduction

Providing dynamic page transitions is a key factor in elevating the overall user experience (UX) of modern web applications.

Historically, to morph or fade elements smoothly between page navigations, developers had to import heavy JavaScript libraries like Framer Motion or GSAP. These libraries require deep hooks into rendering lifecycles to delay unmounting while animating old DOM nodes.

The introduction of the W3C standard View Transitions API simplifies this. It allows browsers to natively capture states and interpolate page layout updates with minimal CSS and JavaScript.

CSS Scroll-Driven Animations: The Future of Scroll-Based Effects

Tue, 25 Jun 2024 00:00:00 +0900

The Problem with JavaScript Scroll Events

Scroll-based effects have traditionally relied on JavaScript scroll event listeners running on the main thread, which often causes jank, dropped frames, and poor user experience. Even with passive listeners and requestAnimationFrame throttling, layout thrashing remains a persistent issue. CSS Scroll-Driven Animations solve this by moving scroll tracking to the compositor thread, enabling smooth 60fps effects without any JavaScript overhead.

Key Concepts

Three core concepts power this feature. A scroll-timeline links an animation to the scroll position of a scroll container. A view-timeline ties an animation to an element’s visibility within a scroll container. The animation-timeline property binds a named animation to either timeline type. Use timeline-scope to share timelines across elements in the DOM tree.

Animation on Commentary of Takao

Smooth Page Transitions with View Transitions API

Introduction

CSS Scroll-Driven Animations: The Future of Scroll-Based Effects

The Problem with JavaScript Scroll Events

Key Concepts