Browser caches can hold on to things longer than the freshness lifetime, and do. They can also evict things before the freshness lifetime is up, and do. The f

Browser caches can hold on to things longer than the freshness lifetime, and do. They can also evict things before the freshness lifetime is up, and do. The freshness lifetime is one of the things a browser can use to decide how long to keep something in its cache, but not the only one.