src/vs/workbench/contrib/notebook/browser/view/renderers/webviewPreloads.ts/MarkupCell/show
class MarkupCell:		public show(id: string, top: number, newContent: string | undefined): void {
			this.element.style.visibility = 'visible';
			this.element.style.top = `${top}px`;
			if (typeof newContent === 'string') {
				this.updateContentAndRender(newContent);
			} else {
				this.updateMarkupDimensions();
			}
		}