Breadcrumb
The trail from the home page down to the page being read.
The trail is built from the page’s ancestors, so it needs no configuration. The
current page is a span carrying aria-current="page", never a link — a link
to the page you are on is a dead end.
At the top level the breadcrumb renders nothing at all. A trail with one entry is noise.
Every trail also emits schema.org BreadcrumbList metadata, which costs nothing
at render time and is what produces the trail shown under a search result. Turn
it off with:
[params.uswds.breadcrumb]
metadata = false
