For most React apps, start with the native <progress> element and style it. It already communicates progress semantics to assistive technology, supports an indeterminate state, and needs less custom accessibility code than a generic element with role="progressbar". Build custom ARIA markup only when the native element cannot meet the visual or structural need.
Build a reusable native progress component
This component accepts a percentage from 0 to 100. Passing null means the amount completed is unknown, so it renders an indeterminate indicator without inventing a percentage.
function ProgressBar({ value, label = "Progress" }) {
const indeterminate = value == null;
return (
<label className="progress">
<span className="progress__label">{label}</span>
<progress
className="progress__track"
value={indeterminate ? undefined : value}
max={100}
aria-label={label}
/>
{!indeterminate && <span>{value}%</span>}
</label>
);
}Before using this as a production component, define and enforce its input contract. This example assumes values from 0 through 100; validate or clamp caller-supplied values to that range, and decide whether the displayed percentage should be rounded. Keep the visible label and accessible name clear in the consuming design rather than needlessly repeating them.
React documents value as a number from zero to max, and value={null} for indeterminate progress. The native element’s max defaults to 1, so this example sets it to 100 to match percentage values. [React progress reference]
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Choose native or custom ARIA markup
| Approach | Use it when | What you take on |
|---|---|---|
Styled native <progress> |
Its structure and browser behavior can meet the design requirement. | Provide an accessible label and account for browser-specific styling. The native element supplies range and indeterminate behavior. |
Custom element with role="progressbar" |
The DOM or rendering needs cannot be met adequately with the native element. | Implement its accessible name, value range, determinate and indeterminate states, and synchronized visual updates yourself. |
| React Aria ProgressBar | You want a documented library component with richer behavior. | Assess whether its dependency and API fit your project; its documentation describes determinate and indeterminate progress and locale-aware value formatting. |
Prefer a native semantic element when it meets the requirement. A generic element with an ARIA role does not automatically behave like a native control; responsibility for the relevant semantics and behavior remains with the component author. [MDN: <progress>] [MDN: progressbar role] [React Aria ProgressBar]
Implement a custom progressbar accessibly
If you need a custom track and fill, put role="progressbar" on the semantic wrapper. Keep essential label text outside that wrapper: descendants of a progressbar are treated as presentational. Reference the visible label with aria-labelledby, or provide an accessible name using aria-label.
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function CustomProgressBar({ value, label = "Progress" }) {
const indeterminate = value == null;
const safeValue = indeterminate ? null : Math.min(100, Math.max(0, value));
return (
<div>
<span id="progress-label">{label}</span>
<div
role="progressbar"
aria-labelledby="progress-label"
aria-valuemin={0}
aria-valuemax={100}
aria-valuenow={safeValue == null ? undefined : safeValue}
>
<div className="track">
<div
className="fill"
style={{ width: indeterminate ? "35%" : `${safeValue}%` }}
/>
</div>
</div>
</div>
);
}The clamp shown here handles values outside 0–100, but it does not reject non-numeric inputs; validate them according to your component’s API. The sample’s 35% indeterminate fill is merely an animation cue, not a claim that work is 35% complete. Choose a visual treatment that does not suggest an exact completion amount while the state is unknown.
- Keep
aria-valuenowsynchronized with the determinate value and within the declared range. For indeterminate progress, omit it. - Set
aria-valueminandaria-valuemaxwhen the range is not the default zero through 100. - Use
aria-valuetextif a useful spoken value is not a percentage. - Do not use
<progress>for a gauge such as disk space usage or the relevance of a search result; MDN distinguishes that use from progress.
[MDN progressbar role guidance]
Represent unknown progress honestly
Use an indeterminate state when the amount completed is unknown. In React, pass null for the native element’s value; in HTML, omitting value also represents progress whose amount is unknown. Do not show a made-up numeric percentage in the visual display or ARIA value. [React progress reference] [MDN <progress> reference]
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Associate progress with an updating region
When the indicator describes a particular page region that is being updated, connect the progress element and that region. Set aria-describedby on the region to reference the progress indicator, and set aria-busy="true" on the region while the update is in progress. Clear the busy state when the update finishes. [MDN <progress> reference]
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Check the component before shipping
- Give the indicator a concise accessible name, such as “Uploading report.”
- Confirm that determinate values stay inside the range the component declares.
- Ensure a custom progressbar’s visible label is outside its role-bearing element and correctly associated.
- Use an indeterminate state rather than a false percentage when completion is not measurable.
- Verify that a region is marked busy only while its update is underway.
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