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No.350 · Feedback· New

Progress Bar

How far along something is, shown five ways: a bar with its label and value (with an optional buffer), equal steps, a bar for work of unknown length, a colourful bar that reveals its gradient as it grows, and a ring.

The prompt

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Written for the variant you picked above: Linear

Build a progress indicator in the single look selected below, with a label and a value (0–100), at three sizes (4, 8 and 12px tall), Inter 500 at 14px. Above the bar: the label on the left and the value on the right in muted tabular figures (the rounded percentage, or a detail such as '7.2 GB of 10 GB' or 'Step 3 of 5'). Tracks are fully rounded. Value changes ease over 0.45s. At 100 the fill turns green (#15803d / #3fb950). Palette (light / dark): ink and fill #18181b / #ececef, muted #6b6b73 / #a1a1aa, track #ececef / #232327, buffer #c9c9cf / #4a4a52. Semantics: role=progressbar on the track, labelled by the label, with aria-valuemin/max/now and aria-valuetext set to the detail when there is one. Show three examples, the first climbing unevenly to 100, resting, and starting over, on a white panel and a #0b0b0c panel side by side. Selected variant — Linear (linear): Linear: a single fill that scales from the left. Optionally a lighter buffer fill behind it (for media, 'Buffered ahead'). Examples: 'Uploading assets' climbing, 'Storage' at 72% reading '7.2 GB of 10 GB' (large), and a small media bar with a buffer. This selection takes precedence over references to other themes or options in the general brief. Implement this selected appearance; do not add a variant picker or alternative appearances unless requested. Implementation requirements: Use React and TypeScript. Keep the component self-contained, with uniquely scoped CSS and no animation libraries. Include required imports, styles and font setup in the result. Interaction: None; it reports progress. Pair it with a cancel control if the work can be stopped. Motion: Fills ease to each new value over 0.45s. Reduced motion jumps straight to the value, slows the sliding bar and stops the stripes. Accessibility: role=progressbar with a label, min, max, now and a human value text; work of unknown length leaves out the value and sets aria-busy. Responsive behavior: Bars fill their container; rings wrap in a row; the panels stack on narrow screens. Touch: Nothing to tap. Preserve keyboard access, visible focus and reduced-motion behavior. Keep fictional demo data and simulated service calls in a separate usage example; expose callbacks for real actions and recover from rejected requests. Keep usage-example links inside the demo: use local buttons or prevent navigation. Demonstration links must not navigate to Vitrine routes or open other pages; preserve real URL support in the reusable component itself. Verify the result at narrow and wide viewport sizes, with keyboard input and reduced motion enabled.

Notes

Interaction
None; it reports progress. Pair it with a cancel control if the work can be stopped.
Motion
Fills ease to each new value over 0.45s. Reduced motion jumps straight to the value, slows the sliding bar and stops the stripes.
Accessibility
role=progressbar with a label, min, max, now and a human value text; work of unknown length leaves out the value and sets aria-busy.
Responsive
Bars fill their container; rings wrap in a row; the panels stack on narrow screens.
On touch
Nothing to tap.

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