In Bootstrap 5.3, use a .dropdown-menu and a trigger with data-bs-toggle="dropdown" for a contextual menu; use a .collapse target and a trigger with data-bs-toggle="collapse" to show or hide a content region. Both components need Bootstrap’s JavaScript plugin. The examples below use Bootstrap 5.3’s data attributes and include the key accessibility and troubleshooting details.
Choose a dropdown or a collapse
| Component | Use it for | Trigger and target |
|---|---|---|
| Dropdown | A contextual overlay of links or actions | A trigger with data-bs-toggle="dropdown" and a .dropdown-menu |
| Collapse | A content region that expands or contracts in place | A trigger with data-bs-toggle="collapse" targeting an element with .collapse |
These components solve different interaction problems: a dropdown presents a menu, while collapse reveals or hides a content area. Choose based on what the user needs to interact with, not just on how much space the element occupies.
Set up Bootstrap JavaScript
Bootstrap’s CSS styles the components, but their interactive behavior requires Bootstrap JavaScript. The bundle is convenient when you want Popper included for dropdown positioning. Outside navbars, Popper handles dynamic placement; dropdowns inside navbars do not require it. If you include Bootstrap JavaScript without Popper, account for that positioning dependency where it applies.
Use Bootstrap 5.3 attributes such as data-bs-toggle. Markup copied from Bootstrap 4 that uses data-toggle will not wire up these Bootstrap 5 components.
The Tool Desk
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Create a dropdown menu
Put the trigger and menu in a .dropdown wrapper (or another relatively positioned container). Here is a button trigger with two link actions:
<div class="dropdown">
<button class="btn btn-secondary dropdown-toggle" type="button"
data-bs-toggle="dropdown" aria-expanded="false">
Choose an action
</button>
<ul class="dropdown-menu">
<li><a class="dropdown-item" href="/first">First action</a></li>
<li><a class="dropdown-item" href="/second">Second action</a></li>
</ul>
</div>What the markup does
data-bs-toggle="dropdown"tells Bootstrap to treat the button as a dropdown trigger..dropdown-menuidentifies the menu, and.dropdown-itemstyles each link or action.aria-expanded="false"describes the initial closed state. Bootstrap updates this attribute as the dropdown opens and closes.
Click and keyboard behavior
Bootstrap dropdowns open and close on click; they are not hover-first menus. Bootstrap also supports moving among .dropdown-item elements with the cursor keys and closing the menu with Escape. The component is a general overlay, not an automatically complete ARIA application-menu widget. Choose roles and ARIA attributes to suit the actual content and interaction rather than adding application-menu semantics to ordinary navigation links.
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- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
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Create a collapsible content area
Give the trigger a selector that identifies the target, and give the target the .collapse class. For a single target, a button with data-bs-target, aria-expanded and aria-controls is a clear starting point:
<button class="btn btn-primary" type="button"
data-bs-toggle="collapse" data-bs-target="#details"
aria-expanded="false" aria-controls="details">
Show details
</button>
<div class="collapse" id="details">
<div class="card card-body">Details go here.</div>
</div>Start open or closed
The example starts closed. To start open, add show to the target and set the trigger’s initial aria-expanded value to true. Keep those initial values consistent; Bootstrap updates aria-expanded as the panel changes state.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
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Targeting and spacing
The selector in data-bs-target must match the target’s ID. In the example, #details selects the element with id="details". When animating a collapse, do not put padding on the animated .collapse element itself. Put it on an inner wrapper, as the example does with .card.card-body, to avoid interfering with the transition.
Bootstrap’s collapse motion respects the user’s prefers-reduced-motion setting.
Rank #4
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Build a group of collapsible panels
For panels where opening one should close another, data-bs-parent can associate a collapsible area with a parent selector. This provides an accordion-style grouping, but it does not supply every optional keyboard interaction described by the ARIA Authoring Practices accordion pattern. If your interface promises a complete accordion keyboard model, implement and test the missing interactions yourself, including focus behavior and keyboard navigation. Do not treat the visual grouping alone as proof of accessible accordion behavior.
Common problems and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
| Clicking the dropdown trigger does nothing | Bootstrap JavaScript is missing, or the markup uses the Bootstrap 4 attribute. | Load Bootstrap’s JavaScript plugin and use data-bs-toggle="dropdown". |
| A dropdown is positioned incorrectly outside a navbar | Popper is unavailable for dynamic placement. | Use the Bootstrap bundle, which includes Popper, or otherwise make Popper available. |
| A collapse button does not open its panel | The data-bs-target selector does not match the target, or Bootstrap JavaScript is missing. |
Check that the selector identifies the target ID exactly and load Bootstrap’s JavaScript plugin. |
| The panel starts open but is announced as closed | The target has show, but the trigger still has aria-expanded="false". |
For an initially open panel, use both .collapse.show and aria-expanded="true". |
| The collapse animation behaves oddly | Padding is applied to the animated .collapse element. |
Move padding to a child wrapper inside the collapse target. |
| A dropdown appears only on hover, or its roles seem incomplete | The implementation assumes hover behavior or assumes Bootstrap supplies all application-menu semantics. | Use click-triggered behavior and choose semantics appropriate to the menu’s actual content and interaction. |
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Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
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