From the top of your link: "Using the application caching feature described here is at this point highly discouraged; it’s in the process of being removed from

From the top of your link: "Using the application caching feature described here is at this point highly discouraged; it’s in the process of being removed from the Web platform. Use Service Workers instead." Also: https://alistapart.com/article/application-cache-is-a-douchebag https://alistapart.com/article/application-cache-is-a-douche...