[w3c/ServiceWorker] Client postmessage uses MessageEvent (Issue #1823)

gterzian created an issue (w3c/ServiceWorker#1823)

See https://w3c.github.io/ServiceWorker/#dom-client-postmessage-message-options

Should it not be an ExtendableMessageEvent, as is used in https://w3c.github.io/ServiceWorker/#service-worker-postmessage ?

When using a MessageEvent, it's not clear how to turn the service worker source into a window proxy source.

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Received on Monday, 18 May 2026 18:27:21 UTC