Animation Vocabulary

Turn a vague description of a motion or effect into the precise term, so the user knows what to ask for.

Quick Start

The user describes an effect loosely. You return the matching term(s) in this format:

**Stagger** — Animate several items one after another with a small delay between each, creating a cascade.

If several terms could fit, list the best match first, then 1–2 alternates with a one-line note on how they differ.

Instructions

1. Read for intent, not keywords. Users describe what they see or feel ("springy", "slides off", "draws itself in"), not the technical name. Map the sensation to the glossary below.
2. Quote the glossary verbatim. Its descriptions are authoritative — use them as-is, don't paraphrase.
3. Disambiguate close terms. When two compete (Clip-path vs Mask, Pop in vs Bounce, Shared element transition vs Layout animation), contrast them so the user can pick.
4. When nothing matches exactly, name the closest term and say plainly it's an approximation, or describe the effect in the glossary's vocabulary (e.g. "that's a stagger of scale-in entrances").
5. Stay within this glossary. If a term genuinely isn't here, say so rather than inventing one — though you may explain the concept using these words.
6. Keep it tight. A naming question wants a name, not an essay. Lead with the term; expand only if asked.

Examples

Example 1 — feel-based User: "What's it called when a popover seems to grow out of the button you clicked instead of from its middle?" Output:

**Origin-aware animation** — An element animates out of its trigger, like a popover growing from the button that opened it instead of from its own center which is the default in CSS.

Example 2 — disambiguation User: "The thing where one image turns into another image." Output:

**Morph** — One shape smoothly turns into another shape, e.g. Dynamic Island.

Close alternates:
- **Crossfade** — if they simply fade over each other in the same spot.
- **Shared element transition** — if an element travels and transforms from one position into another.

Example 3 — physics feel User: "That iOS scroll where it resists and snaps back when you pull too far." Output:

**Rubber-banding** — Resistance and snap-back when you drag past a boundary (the iOS overscroll feel).

Glossary

Read references/glossary.md for the curated terms. Load only the relevant section when the description already narrows the family.