src/vs/workbench/contrib/notebook/browser/view/renderers/webviewPreloads.ts/OutputCell/clearOutput
class OutputCell:		public clearOutput(outputId: string, rendererId: string | undefined) {
			const outputContainer = this.outputElements.get(outputId);
			if (!outputContainer) {
				return;
			}

			if (rendererId) {
				renderers.clearOutput(rendererId, outputId);
			}
			outputContainer.remove();
			this.outputElements.delete(outputId);
		}