https://api.dart.dev/stable/2.10.4/dart-html/MessageEvent/data.html
data property - MessageEvent class - dart:html library - Dart API
API docs for the data property from the MessageEvent class, for the Dart programming language.
datapropertymessageeventclassdart
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https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent/lastEventId
MessageEvent: lastEventId property - Web APIs | MDN
The lastEventId read-only property of the MessageEvent interface is a string representing a unique ID for the event.
web apismessageeventpropertymdn
