The list of actions that can be triggered is literally endless. You can: display a popup that promotes a sale, features a signup form, invites feedback, etc.; display a notification bar at the top of your site announcing an event, promotion, etc.; add special effects such as falling hearts or snowflakes to make your site more fun or festive; add new content that contains buttons, text, images, and custom HTML. You can also create a custom action by executing your own JavaScript code.