Live Web Development is a free Chrome add-on designed to enhance the web development experience by integrating CSS, HTML, and JavaScript preprocessors. This tool allows developers to create web applications efficiently, featuring real-time preview capabilities and intelligent code completion. Users can dive into coding immediately without the need for boilerplate HTML files, making it ideal for both beginners and seasoned developers.

The add-on offers a range of functionalities including the ability to view live formatted outputs of various preprocessors, import existing sites for modification, and utilize local history for reverting saved projects. Additionally, it incorporates Emmet for quicker HTML writing and provides debugging tools for JavaScript variables, ensuring a robust development environment.