Tab Bar — Animated Underline

Horizontal tab bar with a sliding underline that glides to the active tab’s measured position, full Left/Right/Home/End keyboard navigation, and panels wired with correct ARIA tabs semantics.

Standard Navigation · React · Subscription · commercial licence · v1.0.1 · updated 2026-10-15 · Live demo

Install

velocityx add standard-tab-bar-underline

Subscription component. Run velocityx login with your key first — get one.

---
import TabBarUnderline from '../components/velocity/standard-tab-bar-underline/TabBarUnderline.jsx';
---
<TabBarUnderline client:visible />

Props

Prop	Type	Default	Description
`tabs`	`array`	`[]`	—
`defaultTabId`	—	—	—
`activeTabId`	—	—	—
`onChange`	—	—	—
`label`	`string`	`"Tabs"`	—
`className`	`string`	`""`	—

Files written

velocityx drops these into your project:

components/velocity/standard-tab-bar-underline/TabBarUnderline.jsx

Peer dependencies

react — nothing else. Zero external dependencies is the point.

Theming

Colours come from the primary-* / accent-* Tailwind scales, so this drops into a project that is not Velocity without dragging our brand in. Install the contract once:

velocityx theme

Then set your whole brand in one place — raw RGB channels, not hex (a hex here silently breaks every opacity variant):

:root {
  --vx-brand: custom;
  --vx-primary-600: 220 38 38;
}

There is no component-level font-family anywhere in the library — your font cascade wins.

Licence

Commercial, for the duration of an active Velocity X subscription. The source is served by the licence-gated endpoint, never by the public CDN.