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name: fx-chain-react description: | A chain reaction of bursts ripples across the frame. A bold, canvas-based effect from Open Design's html-ppt fx pack — for slides and launch videos. Guards prefers-reduced-motion (does not start). One per screen; on web use sparingly. triggers:

• "chain"
• "链式反应" od: mode: prototype surface: web platform: desktop category: animation-motion upstream: "https://github.com/nexu-io/open-design" preview: type: html design_system: requires: false example_prompt: | Use fx-chain-react as a section effect on a slide or hero: call HPX'chain-react' on a positioned dark container; keep to one bold effect per screen, with a reduced-motion guard.

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Chain Reaction

A chain reaction of bursts ripples across the frame. From Open Design's html-ppt fx pack (Apache-2.0). Part of motion-anything; obeys MOTION-SPEC.md.

When to use it

• Title cards, section breaks, or hero moments in slides / launch videos.

When NOT to use it (restraint)

• Web body content or anything needing focused reading. Never more than one bold effect at once.

How to apply

1. Copy chain-react.js and _util.js and link them.
2. Add data-fx="chain-react" to a positioned container; call HPX['chain-react'](el) (guard prefers-reduced-motion).

Accessibility & performance

• Guard with prefers-reduced-motion (don't start). Canvas-based; isolated compositing layer.