Re: [w3c/ServiceWorker] Using BroadcastChannel to wake up a service worker (#975)

Use case:

My multi-tab application includes a music player widget, that needs to get updated on every instance, & which needs to load when a new tab of it is opened. I'd like to send the player state out via Broadcast Channel. If the SW can listen to the Broadcast Channel, it can update the cache based on these events.

This seems like a somewhat vital capability for integrating Service Workers with Event Source architectures.

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