The ARIA `group` role and the ARIA `region` role.

Using aria-labelledby pointing to a visible or visually-hidden label, or using aria-label if necessary.

It enforces the rule that only one in a set of details with a matching name value can be open at a time.

The contents of the accordion are searchable using the browser’s in-page search functionality.

It depends on the functionality (and usability!) of the accordion you're creating.