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Using the AppCache
AppCache support is deprecated. Browser vendors have deprecated AppCache, so we
followed their lead. Remove the useAppcache attribute in
the <aura:application> tag of your standalone apps
(.app resources) to avoid cross-browser support issues due to
deprecation by browser vendors.
If you don’t currently set useAppcache in an <aura:application> tag, you don’t have to do anything because the default value of useAppcache is false.