jQuery was and continues to be just about as successful as it is possible for a project to be. The reason it’s no longer as widely used is because it essential

jQuery was and continues to be just about as successful as it is possible for a project to be. The reason it’s no longer as widely used is because it essentially became part of the platform. Most of what jQuery does is now possible with platform APIs, and those APIs exist mostly thanks to jQuery proving their utility. A similar thing happened to CoffeeScript: no one uses it anymore because nearly all of its good ideas made their way into JavaScript itself.