I tried to figure out what might be broken. I think it is because the usage has changed, compare: - https://getbootstrap.com/docs/5.3/components/popovers/#usage - https://getbootstrap.com/docs/4.6/components/popovers/#usage At a minimum, the JS file will need to be udpated: - https://github.com/google/docsy/blob/main/assets/js/offline-search.js