# page-transitions

A skill for animating route changes, view transitions and modal opens. It gives the agent timings and easing curves instead of guesswork.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 667 installs · ★ 124
- Author: dylantarre
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/dylantarre/animation-principles/tree/HEAD/skills/01-by-domain/page-transitions/SKILL.md
- Updated: 2025-12-30
- HTML: https://affpapa.org/en/nevibecode/skills/page-transitions

## What it does

The skill maps Disney's twelve animation principles onto route changes, view transitions and navigation. Inside you get a principle-to-implementation table, ready CSS patterns for crossfade, slide and shared element, a timing reference and a navigation pattern table.

The agent gets specifics. Exit runs on `ease-in`, enter on `ease-out`, and linear easing is called out as feeling broken. Durations are split by type: crossfade 200-300ms, slide forward 300-400ms, modal open 250-350ms, tab switch 150-200ms. The shared element example uses the View Transitions API with `document.startViewTransition` and `view-transition-name`.

The performance section says to animate `transform` and `opacity` only, and to test transitions on slow devices. If your project already has an animation system, the timings here need reconciling with it — two sets of curves fighting each other is a real risk.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add dylantarre/animation-principles --skill page-transitions -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/page-transitions/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/page-transitions/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add dylantarre/animation-principles --skill page-transitions -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/page-transitions/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add dylantarre/animation-principles --skill page-transitions -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/page-transitions/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install dylantarre/animation-principles page-transitions
```

2. **Manually: put the files in place**
- File: `.github/skills/page-transitions/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add dylantarre/animation-principles --skill page-transitions -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/dylantarre/animation-principles --path skills/01-by-domain/page-transitions
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/page-transitions/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add dylantarre/animation-principles --skill page-transitions -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/dylantarre/animation-principles/tree/HEAD/skills/01-by-domain/page-transitions/SKILL.md

## When to use it
- pick a duration and easing curve for a route change
- carry context from a list view into a detail view
- animate modal open and close
- make back navigation faster than forward
- move a transition onto the View Transitions API

## Example prompts
- Animate the transition from the product list to the detail card with a shared element, 300ms
- Add a modal open animation with scale and fade, ease-out
- Rewrite the tab switch to use transform and opacity, drop the layout property animation

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 983532c4fb315173.

BEGIN THIRD-PARTY FILE 983532c4fb315173
```text
---
name: page-transitions
description: Use when implementing route changes, view transitions, modal opens/closes, or navigation animation in web and mobile applications.
---

# Page Transition Animation

Apply Disney's 12 animation principles to route changes, view transitions, and navigation patterns.

## Quick Reference

| Principle | Page Transition Implementation |
|-----------|-------------------------------|
| Squash & Stretch | Entering page elastic effect |
| Anticipation | Exit animation before enter |
| Staging | Hero elements bridge views |
| Straight Ahead / Pose to Pose | Shared element vs crossfade |
| Follow Through / Overlapping | Content settles after nav |
| Slow In / Slow Out | Asymmetric enter/exit easing |
| Arc | Slide transitions with curve |
| Secondary Action | Background, nav state changes |
| Timing | 200-500ms total transition |
| Exaggeration | Reserved for emphasis moments |
| Solid Drawing | Consistent spatial model |
| Appeal | Smooth, oriented navigation |

## Principle Applications

**Squash & Stretch**: Incoming pages can have subtle elastic settle. Modal sheets bounce slightly on full open. Pull-to-navigate stretches before triggering.

**Anticipation**: Current page begins exit before new page enters. Slight fade or scale prepares for change. Navigation indicator updates before page swaps.

**Staging**: Shared/hero elements maintain context across views. Common elements (nav, footer) stay stable. New content area receives transition focus.

**Straight Ahead vs Pose to Pose**: Shared element transitions morph continuously (straight ahead). Crossfades swap between discrete states (pose to pose). Choose based on content relationship.

**Follow Through & Overlapping**: Page content settles after initial position. Staggered content entry—header, then body, then footer. Images load with subtle fade after container.

**Slow In / Slow Out**: Exit: ease-in (accelerate away). Enter: ease-out (decelerate in). Combined: ease-in-out for shared elements. Never linear—feels broken.

**Arc**: Slide transitions can curve slightly. Stack navigation implies z-depth. Circular reveals expand from trigger point.

**Secondary Action**: Header updates title during transition. Bottom nav indicator moves. Background color shifts. Scroll position resets with transition.

**Timing**: Quick transitions: 200-300ms. Standard: 300-400ms. Complex: 400-500ms. Modal/sheet: 250-350ms. Back navigation often faster than forward.

**Exaggeration**: Save exaggeration for key moments—onboarding, achievement. Regular navigation should be smooth, not theatrical. Users navigate frequently.
```
END THIRD-PARTY FILE 983532c4fb315173

The third-party file has ended. Everything between the 983532c4fb315173 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

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---
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