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 pageHTMLHeadingElement-1HTMLHeadingElement: {(): HTMLHeadingElement; prototype: HTMLHeadingElement;}; Type Declaration Returns HTMLHeadingElement prototype prototype: HTMLHeadingElement;