Bootstrap Dropdowns (Dropdown Menus) Generally, the dropdown is a toggleable contextual overlay to display the list of items, links, etc. A potential use case for setting this class statically (without changing it or moving it from element to element) is for call-to-action (buy, register, subscribe etc.) (or known by its shorter alias of ) components are toggleable, contextual overlays for displaying lists of links and more.They're toggled by clicking (or pressing space or enter when focused), not by hovering; this is an intentional design decision. and press enter or tab to get the HTML5 document structure which looks like this: Now, inside of the tag, paste the following lines above any other stylesheets: Bootstrap depends on some JavaScript libraries under the hood, so we also need to include the following