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A Bootstrap accordion is a set of vertically collapsible panels powered by Bootstrap’s Collapse JavaScript plugin. In Bootstrap 5.3, panels can open independently by default, or be made exclusive so opening one closes another. Before using a downloadable “accordion widget,” verify which Bootstrap version it supports and inspect its markup, keyboard behavior, and reduced-motion handling.
How a Bootstrap accordion works
Bootstrap describes accordions as vertically collapsing components built with its Collapse plugin. Each item pairs a control—normally a button—with a panel. Data attributes connect the button to the panel, while classes reflect whether the panel is open.
In the Bootstrap 5.3 example, the main classes are .accordion, .accordion-item, .accordion-header, .accordion-button, and .accordion-collapse. The control uses data-bs-toggle="collapse" and a target selector. aria-controls identifies the panel, and aria-expanded indicates whether it is open. An initially open panel uses .show. See Bootstrap’s Accordion documentation for v5.3 when adapting the markup.
The exact attributes and behavior can differ across major Bootstrap releases, so treat this as a v5.3 reference rather than version-neutral markup.
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Can multiple panels stay open?
Yes. In Bootstrap v5.3, leaving out data-bs-parent allows multiple panels to remain open at once. To make opening one panel close another in the group, add a parent selector through data-bs-parent. Choose based on the content: independent panels suit readers who may need to compare answers, while exclusive panels keep a long list more compact.
What to inspect before using a widget
The name “Bootstrap Accordion V19” alone does not establish a particular download, its license, or its Bootstrap compatibility. Check the widget’s own documentation and rendered behavior rather than assuming that its name guarantees a version or feature set.
- Bootstrap compatibility: Confirm the widget targets the same Bootstrap major version used by the project, then compare its attributes and classes with that version’s official documentation.
- Panel behavior: Determine whether panels open independently or use a parent selector to close siblings.
- Control and panel relationship: Verify that each control is a semantic button and that its accessible state and panel relationship are exposed in the rendered markup.
- Keyboard interaction and focus: Test the actual widget against the relevant accessibility pattern, including how users reach and operate its controls.
- Motion preferences: Bootstrap documents that accordion animation depends on the
prefers-reduced-motionmedia query. Check the effect in the widget and in the project’s styling. See Bootstrap’s v5.3 accessibility guidance.
Accessibility: use the pattern as a checklist, not a guarantee
The WAI-ARIA Authoring Practices Guide example uses button controls with aria-expanded and aria-controls, and associates each panel with its controlling button. These are useful details to inspect, but matching attributes alone does not prove a widget conforms: its rendered markup and interactions need to be checked against the pattern. Review the WAI-ARIA APG accordion example.
Do not treat older Bootstrap accessibility notes as current behavior without checking their version. Bootstrap 4.0 explicitly noted that its implementation did not cover the pattern’s optional keyboard interactions; that historical statement should not be generalized to every Bootstrap release or third-party widget.
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