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 pageNonElementParentNodeExtended by Document DocumentFragment Methods getElementById() getElementById(elementId): Element | null; Returns the first element within node's descendants whose ID is elementId. MDN Reference Parameters ParameterTypeelementIdstring Returns Element | null