Re: [w3c/ServiceWorker] Consider providing `navigation` event (#1028)

Perhaps you could trigger _foreign navigation_ but not prevent default behaviour if the user has explicitly expressed an intention. 

```js
self.onforeignnavigation = evt => {
  /* Log the event... */
  if (evt.navigationMode === 'default') {
     evt.preventDefault(); // OK
  } else {
     evt.preventDefault(); // throws
  }
};
```

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