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 pageCSSMathValue-1CSSMathValue: {(): CSSMathValue; prototype: CSSMathValue;}; Type Declaration Returns CSSMathValue prototype prototype: CSSMathValue;