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

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