src/vs/workbench/contrib/notebook/browser/view/renderers/webviewPreloads.ts/OutputCell/createOutputElement
class OutputCell:		public createOutputElement(outputId: string, outputOffset: number, left: number): OutputElement {
			let outputContainer = this.outputElements.get(outputId);
			if (!outputContainer) {
				outputContainer = new OutputContainer(outputId);
				this.element.appendChild(outputContainer.element);
				this.outputElements.set(outputId, outputContainer);
			}

			return outputContainer.createOutputElement(outputId, outputOffset, left);
		}