Actually, for accordion (i.e., details and summary), as I understand it, is not accessible out of the box. It's odd that the spec for that control / UI element

Actually, for accordion (i.e., details and summary), as I understand it, is not accessible out of the box. It's odd that the spec for that control / UI element / tags isn't accessible. But you can use JS to fix that. A colleague once shared a blog post with me on this but I can't find it atm.