javascript - How to include popper.js and bootstrap.js in angular project - Stack Overflow
jquery - Dropdown (Bootstrap 4 popper.js) links not working in when the site is converted to wordpress but works fine in the HTML version of the website - Stack Overflow
Bootstrap4はじめての方でもすごく簡単「~導入編~」
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GitHub - adsingh14/Bootstrap-4-Starter-Kit: Bootstrap 4 oriented starter kit with FontAwesome 5, jquery and popper in one package.