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 pageHTMLUnknownElement-1HTMLUnknownElement: {(): HTMLUnknownElement; prototype: HTMLUnknownElement;}; Type Declaration Returns HTMLUnknownElement prototype prototype: HTMLUnknownElement;