<bmx-accordion-item>
A heading with a panel under it that opens and closes.
On its own, an item is a disclosure — the right pattern for one "show more":
It reports
bmxToggle when it opens or closes.
Inside a bmx-accordion, the accordion owns whether it may be open at the same time as its neighbours:
Every property, event and method: https://docs.binarymission.co.uk/webcomponents/bmx/bmx-accordion-item.html