ExtendableMessageEvent on ServiceWorkerGlobalScope

Category: Service Worker
Type: New or changed feature
Status: Enabled by default (Chrome 51)
Intent stage: None

Summary

ServiceWorker.postMessage() now results in an ExtendableMessageEvent fired on ServiceWorkerGlobalScope as a 'message' event. ExtendableMessageEvent.waitUntil() extends its lifetime until a passed Promise is settled. Before this change, postMessage() resulted in a MessageEvent fired on the global scope.

Standards & signals

Specification: https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#extendablemessage-event-section
Firefox: Shipped/Shipping
Safari: No signal
Web developers: No signals
Tracking bug: https://code.google.com/p/chromium/issues/detail?id=598608

Docs: https://developer.mozilla.org/en-US/docs/Web/API/ExtendableMessageEvent

Samples: https://googlechrome.github.io/samples/service-worker/post-message/index.html

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