That's a horrible UX. A better practice would be to avoid infinite scroll and better yet to think carefully before using a full-blown SPA for a standard UI. If

That's a horrible UX. A better practice would be to avoid infinite scroll and better yet to think carefully before using a full-blown SPA for a standard UI. If it's a web page as opposed to a web app, there are certain UX features that every browser supports out of the box and many, many users with keyboards will expect.