View Transitions

View Transitions

Use native View Transitions when continuity between UI states matters and the app can gracefully skip animation in unsupported browsers.

Source: https://github.com/vercel-labs/agent-skills/tree/main/skills/react-view-transitions

When to Use

• list-to-detail navigation
• image or card shared-element morphs
• route transitions with a clear spatial model
• Suspense reveals where new content should appear softly
• list reorders where identity matters

Do not use directional slides for unrelated tabs or unordered navigation. A transition must communicate continuity, depth, order, or arrival.

Availability

• Chromium: supported.
• Safari and Firefox support is improving; verify target browsers before relying on custom effects.
• Unsupported browsers skip the animation path.

For broad product surfaces, keep transitions optional and nonessential.

React Pattern

import { ViewTransition, startTransition } from "react";

export function ResultCard({ id, children }: { id: string; children: React.ReactNode }) {
  return (
    
      {children}
    
  );
}

function openDetail(id: string) {
  startTransition(() => {
    router.push(`/items/${id}`);
  });
}

Placement Rule

`` should wrap the DOM node that appears, exits, or shares identity. Wrapping it in extra DOM can suppress enter/exit behavior.

CSS Recipes

@media (prefers-reduced-motion: no-preference) {
  ::view-transition-old(fade) {
    animation: vt-fade-out 160ms ease both;
  }

  ::view-transition-new(fade) {
    animation: vt-fade-in 220ms ease both;
  }
}

@keyframes vt-fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes vt-fade-out {
  from { opacity: 1; }
  to { opacity: 0; }
}

Rules

• Name shared elements uniquely, such as photo-${id}.
• Ensure only one mounted element uses a given transition name at a time.
• Do not fade out the whole page when a shared element is morphing; it weakens continuity.
• Respect reduced motion.
• Prefer simple fades for lateral tab changes.
• Use directional motion only for hierarchy, ordered sequences, or forward/back navigation.

Verification

Before shipping:

1. Test supported and unsupported browsers.
2. Test reduced motion.
3. Confirm browser back/forward behavior is acceptable.
4. Confirm transition names do not collide in modals, lists, or duplicated components.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: tommylower
• Source: tommylower/cortex
• License: MIT

Install and usage instructions live in the source repository linked above.