Variables for the CSS-based carets that indicate a dropdowns interactivity: Mixins are used to generate the CSS-based carets and can be found in scss/mixins/_caret.scss. Home ; Browse By . Any single .btn can be turned into a dropdown toggle with some markup changes. If youre building our JavaScript from source, it requires util.js. Those extra changes keep the caret centered in the split button and provide a more appropriately sized hit area next to the main button. Authors will have to include these more specific attributes themselves. You can use or