Push an interface past conventional limits. This isn't just about visual effects — it's about using the full power of the browser to make any part of an interface feel extraordinary.

## MANDATORY PREPARATION

Invoke `impeccable` — it contains design principles, anti-patterns, and the **Context Gathering Protocol**. Follow the protocol before proceeding.

**EXTRA IMPORTANT**: Context determines what "extraordinary" means. A particle system on a creative portfolio is impressive. The same particle system on a settings page is embarrassing. But a settings page with instant optimistic saves and animated state transitions? That's extraordinary too.

### Propose Before Building

This skill has the highest potential to misfire. Do NOT jump straight into implementation. You MUST:

1. Think through 2-3 different directions with different techniques and aesthetic approaches
2. Present these directions and get the user's pick before writing any code
3. Only proceed with the direction the user confirms

## What "Extraordinary" Means

**For visual/marketing surfaces**: Scroll-driven reveals, shader backgrounds, cinematic page transitions, generative art

**For functional UI**: Dialog morphing from trigger via View Transitions, data table with 100k rows at 60fps via virtual scrolling, forms with streaming validation, drag-and-drop with spring physics

**For performance-critical UI**: Search filtering 50k items without flicker, image editor processing in near-real-time

## The Toolkit

### Make transitions feel cinematic
- **View Transitions API** — shared element morphing between states
- **`@starting-style`** — animate elements from `display: none` to visible with CSS only
- **Spring physics** — natural motion with mass, tension, and damping

### Tie animation to scroll position
- **Scroll-driven animations** (`animation-timeline: scroll()`) — CSS-only, no JS

### Render beyond CSS
- **WebGL** — shader effects, post-processing, particle systems (Three.js, OGL, regl)
- **Canvas 2D / OffscreenCanvas** — custom rendering, moving heavy work off main thread
- **SVG filter chains** — displacement maps, turbulence for organic distortion

### Make data feel alive
- **Virtual scrolling** — render only visible rows for massive datasets
- **GPU-accelerated charts** — Canvas or WebGL for datasets too large for SVG/DOM
- **`@property`** — register custom CSS properties, enabling animation of gradients and colors

### Push performance boundaries
- **Web Workers** — move computation off the main thread
- **WASM** — near-native performance for computation-heavy features

## Implement with Discipline

### Progressive enhancement is non-negotiable

```css
@supports (animation-timeline: scroll()) {
  .hero { animation-timeline: scroll(); }
}
```

### Performance rules
- Target 60fps. If dropping below 50, simplify.
- Respect `prefers-reduced-motion` — always
- Pause off-screen rendering
- Test on real mid-range devices

**NEVER**:
- Ignore `prefers-reduced-motion` — this is an accessibility requirement
- Ship effects that cause jank on mid-range devices
- Use bleeding-edge APIs without a functional fallback
- Layer multiple competing extraordinary moments — focus creates impact, excess creates noise

## Verify the Result

- **The wow test**: Show it to someone who hasn't seen it. Do they react?
- **The removal test**: Take it away. Does the experience feel diminished?
- **The device test**: Run it on a phone, tablet, Chromebook. Still smooth?
- **The accessibility test**: Enable reduced motion. Still beautiful?

---

*Mirrored from [https://github.com/pbakaus/impeccable](https://github.com/pbakaus/impeccable) — original author: **pbakaus**, license: **Apache-2.0**.*
*This is an unclaimed mirror. Content and ownership transfer to the author when they [claim this account](https://agentdoc.sh/docs/claim).*


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