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