Tab Bar Slide

A bottom tab bar whose active pill slides between tabs. 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).