# Underline Orbit (`.sds-btn-draw-underline-orbit`)

Underline draws under the label, then swings a full orbit and parks back home. Buttons animation in SDS Motion Forge v5.0.0. It loops continuously as soon as the class is applied.

- Page: https://sds-motion-forge.netlify.app/animations/btn-draw-underline-orbit/
- Category: Buttons (https://sds-motion-forge.netlify.app/categories/buttons/)
- Animated properties: opacity, transform
- Compositor-only: yes
- Needs child elements: no
- Needs per-character spans: no
- JavaScript: none required

## Use it

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

<button class="sds-btn-draw-underline-orbit">Button</button>
```

## How it works

Plays as soon as the class is applied, looping continuously. It animates opacity and movement and scale (transform) — compositor-only, so it never causes page reflow. `--sds-duration-dramatic` controls the speed and `--sds-ease-emphasized` controls the feel — override either on the element or :root (the sds-fast/sds-slow modifier classes do exactly that).

## Related

- [Draw Corners](https://sds-motion-forge.netlify.app/animations/btn-draw-corners/)
- [Draw Cross](https://sds-motion-forge.netlify.app/animations/btn-draw-cross/)
- [Draw Dash](https://sds-motion-forge.netlify.app/animations/btn-draw-dash/)
- [Draw Perimeter](https://sds-motion-forge.netlify.app/animations/btn-draw-perimeter/)
- [Draw Pulse Frame](https://sds-motion-forge.netlify.app/animations/btn-draw-pulse-frame/)
- [Edge Trace](https://sds-motion-forge.netlify.app/animations/btn-edge/)
- [Ember](https://sds-motion-forge.netlify.app/animations/btn-ember/)
- [Energy Ripple](https://sds-motion-forge.netlify.app/animations/btn-energy/)