cdnjs popper js code example
Example: popper.js cdn
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/2.6.0/umd/popper.min.js" integrity="sha512-BmM0/BQlqh02wuK5Gz9yrbe7VyIVwOzD1o40yi1IsTjriX/NGF37NyXHfmFzIlMmoSIBXgqDiG1VNU6kB5dBbA==" crossorigin="anonymous"></script>