<bmx-breadcrumb>
The trail back out of wherever you are, which shortens itself rather than wrapping or scrolling when there is not room for all of it.
Drag the handle to narrow the trail, and watch the middle fold away while both ends stay:
The first crumb is the way out and the last is where you are, so those two are the last to go. Below about nine
characters of room, only the last survives.
The separator is a property, so a house style is one attribute rather than a fork:
Every property, event and method: https://docs.binarymission.co.uk/webcomponents/bmx/bmx-breadcrumb.html