The web is the most prominent application platform globally, thanks to its vast user base. It started as a site platform in the 90s and morphed into an application one over time as interactive web applications became a reality. So-called single-page applications (SPAs) represent the current mainstream way of developing web applications but they come with their drawbacks. Although SPAs provide good developer experience, there is a cost for the users due to the underlying technical assumptions. Disappearing frameworks question these assumptions and provide a fresh start. The purpose of this short book is to give a quick introduction to disappearing frameworks and show their meaning as an emerging topic within the space of web application development.