A bottom sheet slides up over a dimmed backdrop, then dismisses. An App-UI micro-interaction. Part of
motion-anything; obeys MOTION-SPEC.md.
When to use it
- Native-feeling feedback on App components (buttons, tabs, sheets, toasts, form controls).
When NOT to use it (restraint)
- Don't slow a frequent action. Don't decorate a control that doesn't change state.
Accessibility & performance
prefers-reduced-motion: shortened / disabled. Transform & opacity only (GPU-safe).