Webflow's interactions functionality is killer but it lacks the foundation of developing interactive content on the web: adding and removing classes. Normally when you build a site, you associate certain behaviors / keyframes with particular classes. Then, upon a trigger like hover or click, you can add or remove a class, which contains all the data about the beginning and end states together. It would be much easier to develop interactions with this ability!
Right now, all we can do is affect width / height, opacity, and "display". On the "interactions" page, it appears to be "coming later" as an available action. Let's do it!