How would you design a caching strategy for a web application to handle offline access and cache invalidation?

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Imagine you have a backpack for school. You put your most important books in it so you can access them quickly, even if you're not at home. But sometimes, you need to swap out old books for new ones to keep your backpack useful and up-to-date.

How would you design a caching strategy for a web application to handle offline access and cache invalidation?

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