Issue link: https://read.uberflip.com/i/1146286
62 | Chapter 8: Rule 8: Make JavaScript and CSS External The beauty of this approach is how forgiving it is. If there's a mismatch between the state of the cookie and the state of the cache, the page still works. It's not as opti- mized as it could be. The session-based cookie technique errs on the side of inlining even though the components are in the browser's cache—if the user reopens the browser, the session-based cookie is absent but the components may still be cached. Changing the cookie from session-based to short-lived (hours or days) addresses this issue, but moves toward erring on the side of using external files when they're not truly in the browser's cache. Either way, the page still works, and across all users there is an improvement in response times by more intelligently choosing between inlining versus using external files. Put your JavaScript and CSS in external files.