I have seen many videos where people use bootstrap 5 popovers using

var popoverTriggerList = [].slice.call(document.querySelectorAll('[data-bs-toggle="popover"]'))
var popoverList = popoverTriggerList.map(function (popoverTriggerEl) {
  return new bootstrap.Popover(popoverTriggerEl)
})

in just HTML file. I haven't found any blogs or videos how people create the popover in using basic DOM. Please suggest me some examples..I am really stuck in my given task because of this popover. please someone suggest me a good example.