Re: [w3c/push-api] Retry push event (#300)

I am testing the use of Web Background Sync... and I get this error on Chrome:

> Uncaught (in promise) DOMException: Attempted to register a sync event **without a window** or registration tag too long.

**When the `push` event is triggered no window is opened and the browser blocks `sync.register`. I assume that the same issue affects the `pushsubscriptionchange` event.** So basically you suggest to use Web Background Sync with the Push API but we cannot use it.

Is there anyone that can be contacted in order to change this behavior and allow `sync.register` even when no window is opened?

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