description: Documentation and examples for using Bootstrap custom progress bars featuring support for stacked bars, animated backgrounds, and text labels.
group: components
toc: true
---
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**New markup in v5.3.0 —** We've deprecated the previous HTML structure for progress bars and replaced it with a more accessible one. The previous structure will continue to work until v6. [See what's changed in our migration guide.]({{< docsref "/migration#improved-markup-for-progress-bars" >}})
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## How it works
Progress components are built with two HTML elements, some CSS to set the width, and a few attributes. We don't use [the HTML5 `<progress>` element](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/progress), ensuring you can stack progress bars, animate them, and place text labels over them.
- We use the `.progress` as a wrapper to indicate the max value of the progress bar.
- The `.progress` wrapper also requires a `role="progressbar"` and `aria` attributes to make it accessible, including an accessible name (using `aria-label`, `aria-labelledby`, or similar).
- We use the inner `.progress-bar` purely for the visual bar and label.
- The `.progress-bar` requires an inline style, utility class, or custom CSS to set its width.
- We provide a special `.progress-stacked` class to create multiple/stacked progress bars.
Put that all together, and you have the following examples.
Bootstrap provides a handful of [utilities for setting width]({{< docsref "/utilities/sizing" >}}). Depending on your needs, these may help with quickly configuring the width of the `.progress-bar`.
You only set a `height` value on the `.progress` container, so if you change that value, the inner `.progress-bar` will automatically resize accordingly.
Note that by default, the content inside the `.progress-bar` is controlled with `overflow: hidden`, so it doesn't bleed out of the bar. If your progress bar is shorter than its label, the content will be capped and may become unreadable. To change this behavior, you can use `.overflow-visible` from the [overflow utilities]({{< docsref "/utilities/overflow" >}}).
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Labels longer than the progress bar within may not be fully accessible using this method because it relies on the text color having the correct contrast ratio with both the `.progress` and `.progress-bar` background colors. Use caution when implementing this example.
If the text can overlap the progress bar, we often recommend displaying the label outside of the progress bar for better accessibility.
If you're adding labels to progress bars with a custom background color, make sure to also set an appropriate [text color]({{< docsref "/utilities/colors#colors" >}}), so the labels remain readable and have sufficient contrast. We recommend using the [color and background]({{< docsref "/helpers/color-background" >}}) helper classes.
You can include multiple progress components inside a container with `.progress-stacked` to create a single stacked progress bar. Note that in this case, the styling to set the visual width of the progress bar *must* be applied to the `.progress` elements, rather than the `.progress-bar`s.
As part of Bootstrap's evolving CSS variables approach, progress bars now use local CSS variables on `.progress` for enhanced real-time customization. Values for the CSS variables are set via Sass, so Sass customization is still supported, too.
