Copy pageCopy pageCopy this page as Markdown for LLMsView as MarkdownView this page as plain textOpen in ClaudeAsk questions about this pageOpen in ChatGPTAsk questions about this pageOn this pageMessagePortEventMapExtends MessageEventTargetEventMap Properties message message: MessageEvent; Overrides MessageEventTargetEventMap.message messageerror messageerror: MessageEvent; Overrides MessageEventTargetEventMap.messageerror