Breadcrumbs should adhere to the guidelines in https://www.w3.org/TR/wai-aria-practices-1.1/examples/breadcrumb/index.html i.e. be a <nav aria label="Breadcrumb" class="breadcrumb"> with an ordered list inside, with appropriate styling to make it appear as breadcrumbs. It should also have aria-current="page" to specify where the current page is.