Breadcrumb

A <nav aria-label="Breadcrumb"> around an ordered list, so it is announced as a list with its length.

The current page has aria-current="page" and is not a link.

Separators are decorative and aria-hidden, so screen readers read only the crumbs.

The ellipsis is a button named Show all breadcrumbs; opening it moves focus to the first crumb it revealed.