Explore the intricacies of Progressive Web Apps (PWAs) and service workers in this conference talk from JSWORLD Conference 2022. Dive deep into the architecture and design patterns necessary for building cross-platform applications that provide a native app-like experience, including offline functionality. Learn about serverless architecture and various implementation methods for service workers to enhance offline capabilities. Discover the evolution of service workers, effective caching strategies, and practical code examples for handling fetch events, offline fallback pages, and resource management. Gain insights into optimizing headers, pages, and images for PWAs, ultimately equipping you with the knowledge to create robust, offline-capable web applications.