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The web is built on one fundamental assumption: everyone has a stable internet connection, all the time – but that's certainly not true. In this course, Building Offline Web Apps with Service Worker, you'll learn everything you need to break this assumption. First, you'll learn about Service Workers and the new Caching API. Then, you'll discover prerequisite technologies like JavaScript promises and the Fetch API. Finally, you'll explore how to leverage the new cache API defined in the Service Worker specification. When you've finished with this course, you'll know everything you need to take you current web application to places it's never been before, places without internet connection.