Drop.js Drop.js is a fast and capable dropdown library built on Tether. How to Use Drop is an open-source JavaScript and CSS library that creates and positions dropdowns. It's powered by Tether.js. To use, first download the latest tether and drop releases. Then add this to your page: <link rel="stylesheet" href="drop-theme-arrows.css" /> <script src="tether.min.js"></script> <script src="drop.min