Collapse
Collapse shows and hides content with a short animation. Point a button or link at the target with data-bs-toggle="collapse", keep aria-expanded and aria-controls in sync, and use it for read-more text, filter panels, sub-menus and expandable rows.
1Button toggle
A button with data-bs-toggle="collapse" shows and hides the target.
Teams report saving around five hours a week after the first month. We keep things simple, so you can focus on what matters to you.
<button class="btn btn-primary" type="button" data-bs-toggle="collapse" data-bs-target="#collapse-908" aria-expanded="false" aria-controls="collapse-908">Toggle details</button>
<div class="collapse" id="collapse-908">
<div class="card card-body mt-2">
Teams report saving around five hours a week after the first month. We keep things simple, so you can focus on what matters to you.
</div>
</div>2Link toggle
A link with href="#id" and role="button" works the same way.
What does this mean?
Our team has done this many times, so you never have to guess.
<a class="link-primary" data-bs-toggle="collapse" href="#collapse-909" role="button" aria-expanded="false" aria-controls="collapse-909"><i class="bi bi-info-circle-fill" aria-hidden="true"></i> What does this mean?</a>
<div class="collapse" id="collapse-909">
<p class="small text-body-secondary mt-2 mb-0">Our team has done this many times, so you never have to guess.</p>
</div>3Horizontal collapse
collapse-horizontal animates the width; the content needs a fixed width.
We measure success by how many customers come back and tell their friends.
<button class="btn btn-outline-primary" type="button" data-bs-toggle="collapse" data-bs-target="#collapse-910" aria-expanded="false" aria-controls="collapse-910">Toggle width</button>
<div style="min-height: 110px;" class="mt-2">
<div class="collapse collapse-horizontal" id="collapse-910">
<div class="card card-body" style="width: 260px;">
We measure success by how many customers come back and tell their friends.
</div>
</div>
</div>4Multiple targets
One button can toggle several elements by targeting a shared class.
Set up in an afternoon, connect the tools you use and invite your team.
Granular roles keep sensitive work private while everyone else stays informed.
<div class="d-flex flex-wrap gap-2 mb-2">
<button class="btn btn-outline-secondary" type="button" data-bs-toggle="collapse" data-bs-target="#multi-911" aria-expanded="false" aria-controls="multi-911">Toggle first</button>
<button class="btn btn-outline-secondary" type="button" data-bs-toggle="collapse" data-bs-target="#multi-912" aria-expanded="false" aria-controls="multi-912">Toggle second</button>
<button class="btn btn-primary" type="button" data-bs-toggle="collapse" data-bs-target=".multi-group-913" aria-expanded="false" aria-controls="multi-911 multi-912">Toggle both</button>
</div>
<div class="row g-2">
<div class="col-sm-6">
<div class="collapse multi-group-913" id="multi-911">
<div class="card card-body">
Set up in an afternoon, connect the tools you use and invite your team.
</div>
</div>
</div>
<div class="col-sm-6">
<div class="collapse multi-group-913" id="multi-912">
<div class="card card-body">
Granular roles keep sensitive work private while everyone else stays informed.
</div>
</div>
</div>
</div>5Read more
Show the first part of a text and reveal the rest on demand.
Your data is encrypted, backed up daily and hosted in the region you choose. Every detail is handled by people who care about getting it right.
Plan projects, track progress and share updates without another status meeting. Set up in an afternoon, connect the tools you use and invite your team. Start free, upgrade when you grow and cancel any time with one click.
<p class="mb-1">Your data is encrypted, backed up daily and hosted in the region you choose. Every detail is handled by people who care about getting it right.</p>
<div class="collapse" id="more-914">
<p class="mb-1">Plan projects, track progress and share updates without another status meeting. Set up in an afternoon, connect the tools you use and invite your team. Start free, upgrade when you grow and cancel any time with one click.</p>
</div>
<button class="btn btn-link px-0 ca-more" type="button" data-bs-toggle="collapse" data-bs-target="#more-914" aria-expanded="false" aria-controls="more-914"><span class="ca-more-show">Read more</span><span class="ca-more-hide">Show less</span></button>6Filter panel
A filter button above a table reveals extra search fields.
<div class="d-flex gap-2">
<input type="search" class="form-control" placeholder="Search orders" aria-label="Search orders" style="max-width: 280px;">
<button class="btn btn-outline-secondary" type="button" data-bs-toggle="collapse" data-bs-target="#filters-915" aria-expanded="false" aria-controls="filters-915"><i class="bi bi-sliders" aria-hidden="true"></i> Filters</button>
</div>
<div class="collapse" id="filters-915">
<div class="border rounded p-3 mt-2 row g-2">
<div class="col-sm-6">
<label class="form-label small" for="filter-q-916">Customer</label>
<input class="form-control form-control-sm" id="filter-q-916" type="text" placeholder="Mason Nguyen">
</div>
<div class="col-sm-6">
<label class="form-label small" for="filter-status-917">Status</label>
<select class="form-select form-select-sm" id="filter-status-917">
<option>Any</option>
<option>Paid</option>
<option>Pending</option>
<option>Refunded</option>
</select>
</div>
<div class="col-12 text-end">
<button type="button" class="btn btn-primary btn-sm">Apply</button>
</div>
</div>
</div>7Sidebar sub-menus
Nested navigation where each section expands to show its links.
<nav class="border rounded p-2" style="max-width: 260px;" aria-label="Admin menu">
<ul class="nav flex-column">
<li class="nav-item"><a class="nav-link link-body-emphasis" href="#"><i class="bi bi-house-fill" aria-hidden="true"></i> Home</a></li>
<li class="nav-item"><a class="nav-link link-body-emphasis d-flex justify-content-between" data-bs-toggle="collapse" href="#menu-918" role="button" aria-expanded="true" aria-controls="menu-918"><span><i class="bi bi-bag-fill" aria-hidden="true"></i> Sales</span><i class="bi bi-chevron-down" aria-hidden="true"></i></a><div class="collapse show" id="menu-918"><ul class="nav flex-column ms-4 small"><li class="nav-item"><a class="nav-link py-1" href="#">Orders</a></li><li class="nav-item"><a class="nav-link py-1" href="#">Invoices</a></li></ul></div></li>
<li class="nav-item"><a class="nav-link link-body-emphasis d-flex justify-content-between" data-bs-toggle="collapse" href="#menu-919" role="button" aria-expanded="false" aria-controls="menu-919"><span><i class="bi bi-bar-chart-fill" aria-hidden="true"></i> Reports</span><i class="bi bi-chevron-down" aria-hidden="true"></i></a><div class="collapse" id="menu-919"><ul class="nav flex-column ms-4 small"><li class="nav-item"><a class="nav-link py-1" href="#">Weekly</a></li><li class="nav-item"><a class="nav-link py-1" href="#">Monthly</a></li></ul></div></li>
</ul>
</nav>8Expandable table rows
A detail row under each table row opens with a small toggle.
| Invoice | Amount | Details |
|---|---|---|
| #PO-2975 | $459.77 | |
Billed to Ella Ortega, Auckland. Due Jan 1, 2027. | ||
| #INV-8627 | $488.33 | |
Billed to Aria Quinn, Prague. Due Oct 28, 2026. | ||
<div class="table-responsive">
<table class="table align-middle mb-0">
<thead>
<tr>
<th scope="col">Invoice</th>
<th scope="col">Amount</th>
<th scope="col"><span class="visually-hidden">Details</span></th>
</tr>
</thead>
<tbody>
<tr>
<td>#PO-2975</td>
<td>$459.77</td>
<td class="text-end"><button class="btn btn-sm btn-light border" type="button" data-bs-toggle="collapse" data-bs-target="#row-detail-920" aria-expanded="false" aria-controls="row-detail-920"><i class="bi bi-chevron-expand" aria-hidden="true"></i><span class="visually-hidden">Show details</span></button></td>
</tr>
<tr>
<td colspan="3" class="p-0 border-0"><div class="collapse" id="row-detail-920"><div class="p-3 bg-body-tertiary small">Billed to Ella Ortega, Auckland. Due Jan 1, 2027.</div></div></td>
</tr>
<tr>
<td>#INV-8627</td>
<td>$488.33</td>
<td class="text-end"><button class="btn btn-sm btn-light border" type="button" data-bs-toggle="collapse" data-bs-target="#row-detail-921" aria-expanded="false" aria-controls="row-detail-921"><i class="bi bi-chevron-expand" aria-hidden="true"></i><span class="visually-hidden">Show details</span></button></td>
</tr>
<tr>
<td colspan="3" class="p-0 border-0"><div class="collapse" id="row-detail-921"><div class="p-3 bg-body-tertiary small">Billed to Aria Quinn, Prague. Due Oct 28, 2026.</div></div></td>
</tr>
</tbody>
</table>
</div>9Advanced form options
Hide rarely used settings behind an "Advanced" toggle.
<div style="max-width: 420px;">
<a class="small" data-bs-toggle="collapse" href="#advanced-922" role="button" aria-expanded="false" aria-controls="advanced-922"><i class="bi bi-gear-fill" aria-hidden="true"></i> Advanced options</a>
<div class="collapse" id="advanced-922">
<div class="mt-2">
<label class="form-label small" for="adv-slug-923">URL slug</label>
<input class="form-control form-control-sm mb-2" id="adv-slug-923" type="text" value="how-remote-teams-keep-projects-on-track">
<div class="form-check">
<input class="form-check-input" type="checkbox" id="adv-index-924">
<label class="form-check-label small" for="adv-index-924">Hide from search engines</label>
</div>
</div>
</div>
</div>10Minimisable card
A header button collapses the card body, as in dashboard widgets.
Traffic
77.4k
8% this week
<div class="card" style="max-width: 26rem;">
<div class="card-header d-flex justify-content-between align-items-center">
<span class="fw-semibold"><i class="bi bi-graph-up" aria-hidden="true"></i> Traffic</span>
<button class="btn btn-sm btn-link link-secondary p-0" type="button" data-bs-toggle="collapse" data-bs-target="#widget-925" aria-expanded="true" aria-controls="widget-925"><i class="bi bi-dash-square-fill" aria-hidden="true"></i><span class="visually-hidden">Minimise</span></button>
</div>
<div class="collapse show" id="widget-925">
<div class="card-body">
<div class="fs-3 fw-bold">
77.4k
</div>
<div class="small text-success">
<i class="bi bi-arrow-up" aria-hidden="true"></i> 8% this week
</div>
</div>
</div>
</div>11Open by default
Add .show to start expanded; the button's aria-expanded is then true.
Onboarding guides and live chat help new colleagues get going on day one. Granular roles keep sensitive work private while everyone else stays informed.
<button class="btn btn-outline-dark btn-sm" type="button" data-bs-toggle="collapse" data-bs-target="#collapse-926" aria-expanded="true" aria-controls="collapse-926">Hide summary</button>
<div class="collapse show" id="collapse-926">
<div class="alert alert-secondary mt-2 mb-0">
Onboarding guides and live chat help new colleagues get going on day one. Granular roles keep sensitive work private while everyone else stays informed.
</div>
</div>12Rotating chevron
A chevron that turns when the panel opens, driven by aria-expanded in CSS.
We measure success by how many customers come back and tell their friends.
<button class="btn btn-light border w-100 d-flex justify-content-between align-items-center ca-chev" type="button" data-bs-toggle="collapse" data-bs-target="#collapse-927" aria-expanded="false" aria-controls="collapse-927" style="max-width: 420px;">Shipping & returns<i class="bi bi-chevron-down" aria-hidden="true"></i></button>
<div class="collapse" id="collapse-927" style="max-width: 420px;">
<div class="p-3 small">
We measure success by how many customers come back and tell their friends.
</div>
</div>13Comments thread
Keep a feed short and let readers open the replies.
Teams report saving around five hours a week after the first month.
View 2 replies
Lucas Morgan Friendly people answer your questions quickly, by phone, chat or email.
Owen Brennan Every detail is handled by people who care about getting it right.
<p class="mb-1">Teams report saving around five hours a week after the first month.</p>
<a class="small" data-bs-toggle="collapse" href="#comments-928" role="button" aria-expanded="false" aria-controls="comments-928"><i class="bi bi-chat-fill" aria-hidden="true"></i> View 2 replies</a>
<div class="collapse" id="comments-928">
<div class="mt-2 ps-3 border-start">
<div class="d-flex gap-2 mb-2">
<img src="../assets/img/avatar-9.svg" alt="Lucas Morgan" class="rounded-circle flex-shrink-0" width="32" height="32">
<div class="bg-body-tertiary rounded p-2 small">
<strong>Lucas Morgan</strong> Friendly people answer your questions quickly, by phone, chat or email.
</div>
</div>
<div class="d-flex gap-2 mb-2">
<img src="../assets/img/avatar-2.svg" alt="Owen Brennan" class="rounded-circle flex-shrink-0" width="32" height="32">
<div class="bg-body-tertiary rounded p-2 small">
<strong>Owen Brennan</strong> Every detail is handled by people who care about getting it right.
</div>
</div>
</div>
</div>14Release notes
A compact version line that expands into the full change list.
Version 6.2 Stable
Apr 1, 2026
- Dark mode
- Real-time collaboration
- Faster loading on slow connections
<div class="border rounded p-3">
<div class="d-flex justify-content-between align-items-center">
<div>
<span class="fw-semibold">Version 6.2</span> <span class="badge text-bg-success">Stable</span>
<div class="small text-body-secondary">
Apr 1, 2026
</div>
</div>
<button class="btn btn-outline-primary btn-sm" type="button" data-bs-toggle="collapse" data-bs-target="#notes-929" aria-expanded="false" aria-controls="notes-929">What's new</button>
</div>
<div class="collapse" id="notes-929">
<ul class="small mt-3 mb-0">
<li>Dark mode</li>
<li>Real-time collaboration</li>
<li>Faster loading on slow connections</li>
</ul>
</div>
</div>15Specification list
A definition list of technical details hidden behind a full-width toggle.
- Weight
- 7.3 kg
- Dimensions
- 48 x 59 x 9 cm
- Warranty
- 1 years
<button class="btn btn-outline-secondary w-100" type="button" data-bs-toggle="collapse" data-bs-target="#specs-930" aria-expanded="false" aria-controls="specs-930"><i class="bi bi-list-columns-reverse" aria-hidden="true"></i> Full specifications</button>
<div class="collapse" id="specs-930">
<dl class="row small border rounded p-3 mt-2 mb-0">
<dt class="col-sm-4">Weight</dt>
<dd class="col-sm-8">7.3 kg</dd>
<dt class="col-sm-4">Dimensions</dt>
<dd class="col-sm-8">48 x 59 x 9 cm</dd>
<dt class="col-sm-4">Warranty</dt>
<dd class="col-sm-8 mb-0">1 years</dd>
</dl>
</div>16Expandable search bar
A search icon in a header opens a full-width search field below it.
Vela
<div class="border rounded">
<div class="d-flex align-items-center justify-content-between p-2">
<span class="fw-bold">Vela</span>
<button class="btn btn-light" type="button" data-bs-toggle="collapse" data-bs-target="#msearch-931" aria-expanded="false" aria-controls="msearch-931"><i class="bi bi-search" aria-hidden="true"></i><span class="visually-hidden">Search</span></button>
</div>
<div class="collapse" id="msearch-931">
<div class="p-2 border-top">
<label class="visually-hidden" for="msearch-input-932">Search</label>
<input type="search" class="form-control" id="msearch-input-932" placeholder="Search Vela">
</div>
</div>
</div>17Onboarding checklist
Each checklist step expands to explain what to do.
Automations take care of the repetitive steps, so people can focus on real work.
Plan projects, track progress and share updates without another status meeting.
Clear reports turn weekly numbers into decisions in minutes, not days.
<div class="list-group" style="max-width: 480px;">
<div class="list-group-item">
<button class="btn btn-link p-0 text-decoration-none link-body-emphasis d-flex align-items-center gap-2 w-100 text-start" type="button" data-bs-toggle="collapse" data-bs-target="#step-933" aria-expanded="false" aria-controls="step-933"><span class="text-success"><i class="bi bi-check-circle-fill" aria-hidden="true"></i></span>Verify your email</button>
<div class="collapse" id="step-933">
<p class="small text-body-secondary mt-2 mb-1 ms-4">Automations take care of the repetitive steps, so people can focus on real work.</p>
</div>
</div>
<div class="list-group-item">
<button class="btn btn-link p-0 text-decoration-none link-body-emphasis d-flex align-items-center gap-2 w-100 text-start" type="button" data-bs-toggle="collapse" data-bs-target="#step-934" aria-expanded="false" aria-controls="step-934"><span class="text-body-tertiary"><i class="bi bi-circle-fill" aria-hidden="true"></i></span>Add a payment method</button>
<div class="collapse" id="step-934">
<p class="small text-body-secondary mt-2 mb-1 ms-4">Plan projects, track progress and share updates without another status meeting.</p>
</div>
</div>
<div class="list-group-item">
<button class="btn btn-link p-0 text-decoration-none link-body-emphasis d-flex align-items-center gap-2 w-100 text-start" type="button" data-bs-toggle="collapse" data-bs-target="#step-935" aria-expanded="false" aria-controls="step-935"><span class="text-body-tertiary"><i class="bi bi-circle-fill" aria-hidden="true"></i></span>Invite a teammate</button>
<div class="collapse" id="step-935">
<p class="small text-body-secondary mt-2 mb-1 ms-4">Clear reports turn weekly numbers into decisions in minutes, not days.</p>
</div>
</div>
</div>18Swap two panels
Two collapses sharing a class swap places: one hides while the other shows.
Read-only view: Thousands of customers already trust us, and we work hard to keep it that way.
<div class="pane-group-938">
<div class="collapse show pane-group-938-p" id="pane-936">
<div class="card card-body">
<p><i class="bi bi-eye" aria-hidden="true"></i> Read-only view: Thousands of customers already trust us, and we work hard to keep it that way.</p>
<button class="btn btn-primary btn-sm align-self-start" type="button" data-bs-toggle="collapse" data-bs-target=".pane-group-938-p" aria-expanded="true" aria-controls="pane-936 pane-937"><i class="bi bi-pencil-fill" aria-hidden="true"></i> Edit</button>
</div>
</div>
<div class="collapse pane-group-938-p" id="pane-937">
<div class="card card-body">
<label class="form-label" for="pane-937-text">Description</label>
<textarea class="form-control mb-2" id="pane-937-text" rows="2">Real-time dashboards show what is on track and what needs attention.</textarea>
<button class="btn btn-success btn-sm align-self-start" type="button" data-bs-toggle="collapse" data-bs-target=".pane-group-938-p" aria-expanded="false" aria-controls="pane-936 pane-937"><i class="bi bi-check-lg" aria-hidden="true"></i> Done</button>
</div>
</div>
</div>19Grouped notifications
Older notifications collapse into a single "show earlier" row.
- We keep things simple, so you can focus on what matters to you.
- Start in minutes and get help from a real person whenever you need it.
- Every update lands in one place, so nothing gets lost in email threads.
<ul class="list-group" style="max-width: 420px;">
<li class="list-group-item small"><i class="bi bi-bell-fill" aria-hidden="true"></i> We keep things simple, so you can focus on what matters to you.</li>
<li class="list-group-item p-0"><div class="collapse" id="group-939"><ul class="list-group list-group-flush"><li class="list-group-item small text-body-secondary">Start in minutes and get help from a real person whenever you need it.</li><li class="list-group-item small text-body-secondary">Every update lands in one place, so nothing gets lost in email threads.</li></ul></div><button class="btn btn-link btn-sm w-100" type="button" data-bs-toggle="collapse" data-bs-target="#group-939" aria-expanded="false" aria-controls="group-939">Show 7 earlier</button></li>
</ul>20Nested collapse
A collapse inside another for drilling into details step by step.
Your data is encrypted, backed up daily and hosted in the region you choose.
- Design: $3,461.31
- Development: $9,699.77
- Marketing: $4,259.69
<button class="btn btn-outline-primary" type="button" data-bs-toggle="collapse" data-bs-target="#outer-940" aria-expanded="false" aria-controls="outer-940">Project details</button>
<div class="collapse" id="outer-940">
<div class="card card-body mt-2">
<p>Your data is encrypted, backed up daily and hosted in the region you choose.</p>
<button class="btn btn-sm btn-outline-secondary align-self-start" type="button" data-bs-toggle="collapse" data-bs-target="#inner-941" aria-expanded="false" aria-controls="inner-941">Budget breakdown</button>
<div class="collapse" id="inner-941">
<ul class="small mt-2 mb-0">
<li>Design: $3,461.31</li>
<li>Development: $9,699.77</li>
<li>Marketing: $4,259.69</li>
</ul>
</div>
</div>
</div>