Re: [whatwg/fetch] Add Stale While Revalidate Handling (#853)

Hi.
We really lack the ability to handle events, receive a new response, to a background asynchronous browser request.
Are there any plans to add such an event so that we can handler to it?
Prototype handler interface:
```JS

addEventListener('cache-stale-updated', ({ data: url }) => myReRenderContentByUrl(url));

```

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