Is there something extra you are doing to get this to work? e.g. a web component wrapper? It doesn’t do anything for me.
No, there is nothing extra. As @JasonM mentioned such things as slot="trigger" are important.
I can’t for the life of me get
sp-overlayto work - I’m also intrigued to where it’s documented as I can’t see it here (orsp-popoverfor that matter).
Yes, this is not documented. I’m not sure where I got the idea for the code. I think @kerrishotts posted some snippets here in the forum.