# Spring Kerning (`.sds-spring-kerning`)

Mouse X expands/compresses spacing. Interactive animation in SDS Motion Forge v5.0.0. It plays once in response to the cursor.

- Page: https://sds-motion-forge.netlify.app/animations/spring-kerning/
- Category: Interactive (https://sds-motion-forge.netlify.app/categories/interactive/)
- Animated properties: n/a
- Compositor-only: yes
- Needs child elements: no
- Needs per-character spans: no
- JavaScript: motion-interactive

## Use it

```html
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@salkomdesignstudio/sds-motion-forge/dist/categories/text.min.css" />

<h2 class="sds-spring-kerning">Spring Kerning</h2>
```

## How it works

Plays as the cursor moves over it (JS engine). It animates the element's appearance — compositor-only, so it never causes page reflow. Timing is fixed for this effect, but you can still override animation-duration/timing-function on the element. Requires motion-interactive.min.js (7 KB, zero-config) — it wires all events and respects prefers-reduced-motion and touch devices.

## Related

- [Repulsion Field](https://sds-motion-forge.netlify.app/animations/repulsion-field/)
- [Scatter & Return](https://sds-motion-forge.netlify.app/animations/scatter-return/)
- [Shockwave](https://sds-motion-forge.netlify.app/animations/shockwave/)
- [Word Morph](https://sds-motion-forge.netlify.app/animations/word-morph/)