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Build a CSS bar chart by keeping each category and value in meaningful HTML, then using CSS to display that data as bars. The chart should remain understandable when styles are missing, changed, or unavailable: labels and values—not bar length or color alone—must communicate the data.
Start with data, then add the bars
CSS controls presentation; it does not supply the meaning of the chart. Choose HTML that fits the data and how people will use it. For a small, static set of category-and-value pairs, a list can provide a useful textual structure. The example below uses a custom property to set each bar’s width, while the category and value remain visible text.
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<ul class="chart">
<li class="chart__item" style="--bar-width: 80%">
<span class="chart__label">North</span>
<span class="chart__track" aria-hidden="true">
<span class="chart__bar"></span>
</span>
<span class="chart__value">80 units</span>
</li>
<li class="chart__item" style="--bar-width: 55%">
<span class="chart__label">South</span>
<span class="chart__track" aria-hidden="true">
<span class="chart__bar"></span>
</span>
<span class="chart__value">55 units</span>
</li>
<li class="chart__item" style="--bar-width: 30%">
<span class="chart__label">West</span>
<span class="chart__track" aria-hidden="true">
<span class="chart__bar"></span>
</span>
<span class="chart__value">30 units</span>
</li>
</ul>These sample values are illustrative. In a real chart, calculate each width against a clearly chosen scale and make that scale clear to readers—for example, explain the unit and what the full track represents. A width percentage without context can make comparisons misleading.
.chart {
display: grid;
gap: 0.75rem;
list-style: none;
margin: 0;
padding: 0;
}
.chart__item {
display: grid;
grid-template-columns: 5rem minmax(4rem, 1fr) 6rem;
align-items: center;
gap: 0.75rem;
}
.chart__track {
display: block;
min-height: 1rem;
background: #e5e7eb;
}
.chart__bar {
display: block;
width: var(--bar-width);
min-height: 1rem;
background: #1769aa;
}
@media (max-width: 30rem) {
.chart__item {
grid-template-columns: 4rem minmax(3rem, 1fr) 5rem;
gap: 0.5rem;
}
}The track is hidden from assistive technology here because it is decorative; the category and value are already supplied as text. The list remains meaningful if the CSS fails to load. If you remove the bar-specific styling, readers can still identify every category and its value.
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Keep the chart understandable without visual styling
Do not make bar length, position, or color the only way to learn a value. Keep labels and values in the document, use sufficient contrast for the visual bars, and add context such as units or the scale when readers need it to interpret comparisons. For a chart with many data points or a more complex relationship, provide an equivalent readable representation—often a table or a concise description of the important pattern alongside the chart.
W3C WAI’s guidance on complex images explains that visual presentations can convey structure that assistive technologies may not receive automatically. Applying that principle to a CSS chart means checking that the same essential information is available in text; the guidance does not prescribe one universal markup recipe for CSS charts. W3C WAI: Complex Images
Use HTML semantics that fit the data
A list is one reasonable option for a simple set of category/value pairs, not a mandatory pattern. If the data is naturally tabular, use a table; if the chart is part of a larger interactive component, choose markup that expresses that structure and behavior. Prefer native HTML semantics where they fit instead of adding ARIA roles without need. MDN’s accessibility guidance recommends using the correct semantic HTML element when it already provides the relevant semantics and behavior. MDN: ARIA and accessibility
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There is no single best implementation for every chart. The choice depends on the data, complexity, interaction, and how the equivalent information will be exposed. Whatever representation you choose, keep the underlying values available as understandable content rather than relying on the visual effect to carry their meaning.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A data chart is not a progress bar
Static bars comparing categories represent data; they do not become progress indicators just because they look like bars. Do not add role="progressbar" to an ordinary chart. That role describes a range or progress state, and MDN points to native <progress> or <input type="range"> when those elements suit the use case. MDN: progressbar role
For an actual progress indicator showing that a region is loading, WAI-ARIA says to associate the status with that region using aria-describedby and set aria-busy="true" on the region while it loads. That guidance applies to real loading progress, not category/value charts. W3C: WAI-ARIA 1.2
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