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 pageCommandEventInitExtends EventInit Properties bubbles? optional bubbles?: boolean; Inherited from EventInit.bubbles cancelable? optional cancelable?: boolean; Inherited from EventInit.cancelable command? optional command?: string; composed? optional composed?: boolean; Inherited from EventInit.composed source? optional source?: Element | null;