The obsolete event is fired when the manifest was found to have become a 404 or 410 page, so the application cache is being deleted.
| Property | Type | Description |
|---|---|---|
target | EventTarget (DOM element) | The event target (the topmost target in the DOM tree). Read Only. |
type | string | The type of event. Read only. |
canBubble | boolean | Does the event normally bubble? Read only. |
cancelable | boolean | Is it possible to cancel the event? Read only. |
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https://developer.mozilla.org/en-US/docs/Web/Events/obsolete