Description An examination of the inner workings of frontend web frameworks through the construction of a component-based framework using JavaScript. The text covers how frameworks interact with the DOM, manage state, and handle component lifecycles. Key Topics: Virtual DOM, reconciliation algorithms, component state management, SPA routing, and NPM package publication. About the Technology: Frontend frameworks like React and Vue provide abstractions for DOM manipulation and state synchronization, which are implemented via internal reconciliation and rendering pipelines. About the Book: This guide demonstrates the creation of a frontend framework step-by-step, starting with a basic application in pure JavaScript to identify the problems frameworks solve, then iterating to include advanced features. About the Reader: For web developers with core skills in HTML, CSS, and JavaScript. About the Author: Ángel Sola Orbaiceta is a senior engineer with over a decade of experience in software development for cloud and desktop platforms.