Accordion

The accordion component allows the user to show and hide sections of related content on a page.

An accordion is a lightweight container that may either be used standalone, or be connected to a larger surface, such as a card.

Note: Accordions are no longer documented in the Material Design guidelines, but MUI will continue to support them. It was formerly known as the "expansion panel".

Basic accordion

Controlled accordion

Extend the default behavior to create an accordion with the Accordion component.

Customization

Here is an example of customizing the component. You can learn more about this in the overrides documentation page.

Performance

The content of Accordions is mounted by default even if the accordion is not expanded. This default behavior has server-side rendering and SEO in mind. If you render expensive component trees inside your accordion details or simply render many accordions it might be a good idea to change this default behavior by enabling the unmountOnExit in TransitionProps:

<Accordion TransitionProps={{ unmountOnExit: true }} />

As with any performance optimization this is not a silver bullet. Be sure to identify bottlenecks first and then try out these optimization strategies.

Accessibility

(WAI-ARIA: https://www.w3.org/TR/wai-aria-practices/#accordion)

For optimal accessibility we recommend setting id and aria-controls on the AccordionSummary. The Accordion will derive the necessary aria-labelledby and id for the content region of the accordion.