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Progressive enhancement is a design practice based on the idea that instead of designing for the least capable browser, or mangling our code to make a site look the same in every browser, we should provide a core set of functionality and information to all users, and then progressively enhance the appearance and behaviour of the site for users of more capable browsers. It's a very productive development practice. Instead of spending hours working out how to add drop shadows to the borders of an element in every browser, we simply use the standards-based approach for browsers that support it and don't even attempt to implement it in browsers that don't. After all, the users of older and less capable browsers won't know what they are missing. The biggest challenge to progressive enhancement is the belief among developers and clients that websites should look the same in every browser. As a developer, you can simplify your life and dedicate your time to more interesting challenges if you let go of this outdated notion and embrace progressive enhancement.