updateready event is fired when the resources listed in the application cache manifest have been newly redownloaded, and the script can use
swapCache() to switch to the new cache.
| ||EventTarget (DOM element)||The event target (the topmost target in the DOM tree). Read Only.|
| ||string||The type of event. Read only.|
| ||boolean||Does the event normally bubble? Read only.|
| ||boolean||Is it possible to cancel the event? Read only.|
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