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 pageCanvasCompositingExtended by CanvasRenderingContext2D OffscreenCanvasRenderingContext2D Properties globalAlpha globalAlpha: number; MDN Reference globalCompositeOperation globalCompositeOperation: GlobalCompositeOperation; MDN Reference