# Indeterminate Bar

> A token-driven indeterminate progress bar whose fill segment sweeps continuously across the track for unknown-duration loading, then resolves into an animated success state — fully design-system agnostic.

- Category: Loader
- Frameworks: Vanilla, React + CSS, React + Tailwind
- Design system: Atlas
- Dark mode: yes
- Access: premium (Atheros AI Pass)
- Tags: progress, indeterminate
- Page: https://builder.atheros.ai/components/indeterminate-bar
- Preview: https://d17nmjscumqk5d.cloudfront.net/builder/templates/tpl_builder_indeterminate_bar/preview-bc5ec754e1f1.webp

## Features

- Continuously sweeping fill segment driven purely by `transform: translateX` in a `@keyframes` loop
- Indeterminate semantics — `role="progressbar"` with no `aria-valuenow` for unknown-duration work
- Simulated lifecycle that resolves from loading into a real completion state
- Automatic transition to an animated success checkmark and filled bar when loading finishes
- Restart control to replay the loading sweep on demand
- Sweep pauses and hides on completion via a single panel state class
- Responsive panel that adapts padding down to 280px
- Fully respects `prefers-reduced-motion`

## Accessibility

- **Indeterminate progress** — `role="progressbar"` with no `aria-valuenow` — signalling unknown-duration work — and a descriptive `aria-label`
- **Busy state** — `aria-busy` toggled to `true` while sweeping and `false` on completion
- **Live status** — `aria-live="polite"` on the panel announces title and status changes
- **Keyboard activation** — Restart is a native button, operable with Enter and Space
- **Focus indicators** — `:focus-visible` with `--ring` outline on all interactive elements
- **Reduced motion** — `prefers-reduced-motion: reduce` disables the sweep and all animations

## Keyboard shortcuts

- `Enter` — Activate the focused restart button
- `Space` — Activate the focused restart button
- `Tab` — Move focus to the restart button

## Common questions

**Which frameworks is Indeterminate Bar available in?**

Indeterminate Bar ships as Vanilla, React + CSS and React + Tailwind — HTML, CSS, JS and React source you can copy, download or clone into Atheros AI Builder.

**Is the Indeterminate Bar loader component free?**

Indeterminate Bar is a premium component. Anyone can preview it; the source, downloads and AI customisation are included with Atheros AI Pass.

**Does Indeterminate Bar support dark mode?**

Yes. Indeterminate Bar ships light and dark themes, both drawn from the Atlas design system's tokens. Switch the preview to dark mode to compare them.

## Get the code

Preview Indeterminate Bar live, then sign in to copy or download the source, apply another design system, or ask the AI assistant to change it: https://builder.atheros.ai/components/indeterminate-bar

Every component on https://builder.atheros.ai is also reachable from Claude Code, Cursor and Codex through the Atheros MCP server (paid plans). Component index: https://builder.atheros.ai/llms-components.txt