Bootstrap’s Accordion component is a vertically collapsing interface built on its Collapse JavaScript plugin. You can give it a dark appearance with your own CSS, but the available official documentation does not verify a specific “V10” dark template, its license, release date, Bootstrap compatibility, or tested behavior. The example below uses the documented Bootstrap v5.3 markup as a starting point.
How Bootstrap accordion panels work
Bootstrap pairs a button with a collapsible content region. The button’s data-bs-toggle="collapse" and data-bs-target attributes identify the Collapse behavior and target; aria-controls identifies the controlled region for assistive technology. The region uses .accordion-collapse.collapse. Adding .show makes it visible initially. Bootstrap’s component structure uses .accordion, .accordion-item, .accordion-header, .accordion-button, and .accordion-body.
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Bootstrap documents these patterns in its Accordion v5.3 reference. The markup below follows that reference; it is not evidence about any separately named V10 template.
Build a dark Bootstrap accordion
Use the standard accordion structure, then apply a class for your own theme. This example opens the first panel on page load and allows other panels to be open at the same time.
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<div class="accordion accordion-dark" id="helpAccordion">
<div class="accordion-item">
<h2 class="accordion-header" id="headingOne">
<button class="accordion-button" type="button"
data-bs-toggle="collapse" data-bs-target="#panelOne"
aria-expanded="true" aria-controls="panelOne">
First question
</button>
</h2>
<div id="panelOne" class="accordion-collapse collapse show"
aria-labelledby="headingOne">
<div class="accordion-body">First answer.</div>
</div>
</div>
<div class="accordion-item">
<h2 class="accordion-header" id="headingTwo">
<button class="accordion-button collapsed" type="button"
data-bs-toggle="collapse" data-bs-target="#panelTwo"
aria-expanded="false" aria-controls="panelTwo">
Second question
</button>
</h2>
<div id="panelTwo" class="accordion-collapse collapse"
aria-labelledby="headingTwo">
<div class="accordion-body">Second answer.</div>
</div>
</div>
</div>Add a theme class to style the component without changing its collapse behavior. For example:
.accordion-dark .accordion-item {
color: #f4f4f4;
background-color: #20242a;
border-color: #414751;
}
.accordion-dark .accordion-button {
color: #f4f4f4;
background-color: #20242a;
}
.accordion-dark .accordion-button:not(.collapsed) {
color: #fff;
background-color: #303640;
box-shadow: none;
}
.accordion-dark .accordion-button:focus {
border-color: #86b7fe;
box-shadow: 0 0 0 .25rem rgb(13 110 253 / 25%);
}
.accordion-dark .accordion-body {
color: #d7dbe0;
}These CSS values are an illustrative custom theme, not styling supplied or certified by Bootstrap as a V10 design. Keep a visible focus indicator and check text contrast against your chosen backgrounds.
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Choose whether multiple panels can stay open
Allow several open panels
To let users open multiple panels at once, omit data-bs-parent from each collapsible region. That is the pattern Bootstrap uses for an always-open example.
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For single-open accordion group behavior, set data-bs-parent="#helpAccordion" on each .accordion-collapse region, with the value matching the containing accordion’s ID. Bootstrap documents this attribute as the mechanism that closes another item in the group when a panel opens.
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Set the initial panel state
For a panel that begins open, Bootstrap’s documented state combines .show on the collapse region, aria-expanded="true" on its button, and no .collapsed class on that button. For a panel that begins closed, use .collapse without .show, set the button to aria-expanded="false", and include .collapsed on the button.
Use flush styling when the accordion meets its container edge
Add .accordion-flush to the outer accordion when you want Bootstrap’s edge-to-edge presentation. The v5.3 reference describes this style as removing the default background color, some borders, and some rounded corners. Flush styling changes the component’s visual treatment; it does not determine whether panels can remain open.
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Check compatibility and accessibility before using a template
The title “Bootstrap Accordion V10” alone does not establish which Bootstrap version a third-party implementation supports. Before adopting one, confirm its required Bootstrap version and inspect its markup and behavior against the official version-specific documentation.
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- Check that
aria-controls,aria-labelledby, and the changingaria-expandedstate correspond to the actual button and panel. - Test the controls with a keyboard and assistive technology, including focus visibility and the open/closed state.
- Check the dark theme’s text, borders, and focus indicator against its backgrounds for legibility.
- Bootstrap notes that accordion animation responds to the
prefers-reduced-motionmedia query. Avoid overriding that behavior without considering users who request reduced motion.
For implementation details and supported behavior, use the official Bootstrap v5.3 accordion documentation; it does not identify or validate a particular V10 dark template.
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