# Vercel React View Transitions

> Guide for implementing smooth, native-feeling animations using React's View Transition API (`<ViewTransition>` component, `addTransitionType`, and CSS view transition pseudo-elements). Use this skill whenever the user wants to add page transitions, animate route changes, create shared element animations, animate enter/exit of components, animate list reorder, implement directional (forward/back)…

- **Type:** Skill
- **Install:** `agentstack add skill-ariadoss-superskills-react-view-transitions`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [ariadoss](https://agentstack.voostack.com/s/ariadoss)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [ariadoss](https://github.com/ariadoss)
- **Source:** https://github.com/ariadoss/superskills/tree/main/design-skills/react-view-transitions

## Install

```sh
agentstack add skill-ariadoss-superskills-react-view-transitions
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# React View Transitions

Animate between UI states using the browser's native `document.startViewTransition`. Declare *what* with ``, trigger *when* with `startTransition` / `useDeferredValue` / `Suspense`, control *how* with CSS classes. Unsupported browsers skip animations gracefully.

## When to Animate

Every `` should communicate a spatial relationship or continuity. If you can't articulate what it communicates, don't add it.

Implement **all** applicable patterns from this list, in this order:

| Priority | Pattern | What it communicates |
|----------|---------|---------------------|
| 1 | **Shared element** (`name`) | "Same thing — going deeper" |
| 2 | **Suspense reveal** | "Data loaded" |
| 3 | **List identity** (per-item `key`) | "Same items, new arrangement" |
| 4 | **State change** (`enter`/`exit`) | "Something appeared/disappeared" |
| 5 | **Route change** (layout-level) | "Going to a new place" |

This is an implementation order, not a "pick one" list. Implement every pattern that fits the app. Only skip a pattern if the app has no use case for it.

### Choosing Animation Style

| Context | Animation | Why |
|---------|-----------|-----|
| Hierarchical navigation (list → detail) | Type-keyed `nav-forward` / `nav-back` | Communicates spatial depth |
| Lateral navigation (tab-to-tab) | Bare `` (fade) or `default="none"` | No depth to communicate |
| Suspense reveal | `enter`/`exit` string props | Content arriving |
| Revalidation / background refresh | `default="none"` | Silent — no animation needed |

Reserve directional slides for hierarchical navigation (list → detail) and ordered sequences (prev/next photo, carousel, paginated results). For ordered sequences, the direction communicates position: "next" slides from right, "previous" from left. Lateral/unordered navigation (tab-to-tab) should not use directional slides — it falsely implies spatial depth.

---

## Availability

- **Next.js:** Do **not** install `react@canary` — the App Router already bundles React canary internally. `ViewTransition` works out of the box. `npm ls react` may show a stable-looking version; this is expected.
- **Without Next.js:** Install `react@canary react-dom@canary` (`ViewTransition` is not in stable React).
- Browser support: Chromium 111+, Firefox 144+, Safari 18.2+. Graceful degradation on unsupported browsers.

---

## Core Concepts

### The `` Component

```jsx
import { ViewTransition } from 'react';

  

```

React auto-assigns a unique `view-transition-name` and calls `document.startViewTransition` behind the scenes. Never call `startViewTransition` yourself.

### Animation Triggers

| Trigger | When it fires |
|---------|--------------|
| **enter** | `` first inserted during a Transition |
| **exit** | `` first removed during a Transition |
| **update** | DOM mutations inside a ``. With nested VTs, mutation applies to the innermost one |
| **share** | Named VT unmounts and another with same `name` mounts in the same Transition |

Only `startTransition`, `useDeferredValue`, or `Suspense` activate VTs. Regular `setState` does not animate.

### Critical Placement Rule

`` only activates enter/exit if it appears **before any DOM nodes**:

```jsx
// Works

  Content

// Broken — div wraps the VT, suppressing enter/exit

  
    Content
  

```

---

## Styling with View Transition Classes

### Props

Values: `"auto"` (browser cross-fade), `"none"` (disabled), `"class-name"` (custom CSS), or `{ [type]: value }` for type-specific animations.

```jsx

```

If `default` is `"none"`, all triggers are off unless explicitly listed.

### CSS Pseudo-Elements

- `::view-transition-old(.class)` — outgoing snapshot
- `::view-transition-new(.class)` — incoming snapshot
- `::view-transition-group(.class)` — container
- `::view-transition-image-pair(.class)` — old + new pair

---

## Transition Types

Tag transitions with `addTransitionType` so VTs can pick different animations based on context. Call it multiple times to stack types — different VTs in the tree react to different types:

```jsx
startTransition(() => {
  addTransitionType('nav-forward');
  addTransitionType('select-item');
  router.push('/detail/1');
});
```

Pass an object to map types to CSS classes. Works on `enter`, `exit`, **and** `share`:

```jsx

  

```

**TypeScript:** `ViewTransitionClassPerType` requires a `default` key in the object.

For apps with multiple pages, extract the type-keyed VT into a reusable wrapper:

```jsx
export function DirectionalTransition({ children }: { children: React.ReactNode }) {
  return (
    
      {children}
    
  );
}
```

### `router.back()` and Browser Back Button

`router.back()` and the browser's back/forward buttons do **not** trigger view transitions (`popstate` is synchronous, incompatible with `startViewTransition`). Use `router.push()` with an explicit URL instead.

---

## Shared Element Transitions

Same `name` on two VTs — one unmounting, one mounting — creates a shared element morph:

```jsx

   startTransition(() => onSelect())} />

// On the other view — same name

  

```

- Only one VT with a given `name` can be mounted at a time — use unique names (`photo-${id}`).
- `share` takes precedence over `enter`/`exit`. When no matching pair forms, `enter`/`exit` fires instead.
- Never use a fade-out exit on pages with shared morphs — use a directional slide instead.

---

## Common Patterns

### Enter/Exit

```jsx
{show && (
  
)}
```

### List Reorder

```jsx
{items.map(item => (
  
))}
```

Trigger inside `startTransition`. Avoid wrapper ``s between list and VT.

### Composing Shared Elements with List Identity

```jsx
{items.map(item => (
                                        {/* list identity */}
    
         {/* shared element */}
        
      
      {item.name}
    
  
))}
```

### Force Re-Enter with `key`

```jsx

  

```

**Caution:** If wrapping ``, changing `key` remounts the boundary and refetches.

### Suspense Fallback to Content

Simple cross-fade:
```jsx

  }>

```

Directional reveal:
```jsx
}>
  

```

---

## How Multiple VTs Interact

Every VT matching the trigger fires simultaneously in a single `document.startViewTransition`. VTs in **different** transitions (navigation vs later Suspense resolve) don't compete.

### Use `default="none"` Liberally

Without it, every VT fires the browser cross-fade on **every** transition — Suspense resolves, `useDeferredValue` updates, background revalidations. Always use `default="none"` and explicitly enable only desired triggers.

### Two Patterns Coexist

**Pattern A — Directional slides:** Type-keyed VT on each page, fires during navigation.
**Pattern B — Suspense reveals:** Simple string props, fires when data loads (no type).

They coexist because they fire at different moments. `default="none"` on both prevents cross-interference. Always pair `enter` with `exit`. Place directional VTs in page components, not layouts.

### Nested VT Limitation

When a parent VT exits, nested VTs inside it do **not** fire their own enter/exit — only the outermost VT animates. Per-item staggered animations during page navigation are not possible today.

---

## Accessibility

Always add the reduced motion CSS to your global stylesheet:

```css
@media (prefers-reduced-motion: reduce) {
  ::view-transition-group(*),
  ::view-transition-old(*),
  ::view-transition-new(*) {
    animation: none !important;
  }
}
```

## Source & license

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

- **Author:** [ariadoss](https://github.com/ariadoss)
- **Source:** [ariadoss/superskills](https://github.com/ariadoss/superskills)
- **License:** MIT

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

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-ariadoss-superskills-react-view-transitions
- Seller: https://agentstack.voostack.com/s/ariadoss
- Browse the marketplace: https://agentstack.voostack.com/browse

---
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