For those who want to read more about popover, I also wrote:

- on positioning https://hidde.blog/positioning-anchored-popovers/
- on roles https://hidde.blog/popover-semantics/
- on difference with other patterns https://hidde.blog/dialog-modal-popover-differences/
- on what browsers have built in re popover accessibility (co-authored with Scott O'Hara) https://hidde.blog/popover-accessibility/