Appcache Facts
AppCache was introduced in HTML5 as a simple declarative solution for offline web capability, but its rigid design created numerous frustrating problems: cached content wouldn't update until the next page load, a single failed file would invalidate an entire cache, and unlisted files couldn't load even with an active internet connection. These fundamental limitations—particularly documented in Jake Archibald's 2012 critique—taught the web standards community that declarative caching models were too inflexible for real-world needs, leading to the development of Service Workers, which use JavaScript to give developers imperative control over caching and networking logic and now form the basis of Progressive Web Apps.