src/vs/workbench/contrib/notebook/browser/view/renderers/webviewPreloads.ts/OutputCell/renderOutputElement
class OutputCell:		public async renderOutputElement(data: webviewMessages.ICreationRequestMessage, preloadErrors: ReadonlyArray<Error | undefined>, signal: AbortSignal) {
			const outputElement = this.createOutputElement(data);
			await outputElement.render(data.content, data.rendererId, preloadErrors, signal);

			// don't hide until after this step so that the height is right
			outputElement.element.style.visibility = data.initiallyHidden ? 'hidden' : '';
		}