Graceful degradation and service workers are related in the sense that you can apply service workers to implement graceful degrdation in your application/code. For example, if the network went down for a notes web application and users wanted to be able to still view their notes offline, a service workers could fetch notes from the local storage that was previously fetched before through the same call and return it to the user.
Correct pages link: https://fleazhang.github.io/Lab8_Starter/