Important: Application Cache is deprecated as of Firefox 44, and is no longer available in insecure contexts from Firefox 60 onwards (bug 1354175, currently Nightly/Beta only). Don't use it to offline websites — consider using service workers instead.
Returns a reference to the application cache object for the window.
cache = window.applicationCache
cache is an object reference to an OfflineResourceList.
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https://developer.mozilla.org/en-US/docs/Web/API/window/applicationCache