obsolete event is fired when the manifest was found to have become a 404 or 410 page, so the application cache is being deleted.
| ||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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