extends ExtendableEvent › Event
Available on js
ExtendableMessageEvent interface of the
ServiceWorker API represents the event object of a
message event fired on a service worker (when a channel message is received on the
ServiceWorkerGlobalScope from another context) — extends the lifetime of such events.
Represents, in server-sent events, the last event ID of the event source.
Returns the array containing the
MessagePort objects representing the ports of the associated message channel.