The Cache API allows authors to fully and conveniently manage their content caches for offline use. An origin can have multiple, named Cache objects. This API is already available in a Service Worker context. This entry is to make it available globally (=> accessible from a document context).
Docs: https://developer.mozilla.org/en-US/docs/Web/API/Cache https://developer.mozilla.org/en-US/docs/Web/API/CacheStorage
Samples: https://github.com/GoogleChrome/samples/tree/gh-pages/service-worker/window-caches