src/vs/workbench/contrib/notebook/browser/view/renderers/webviewPreloads.ts/OutputCell/constructor
class OutputCell:		constructor(cellId: string) {
			const container = document.getElementById('container')!;

			const upperWrapperElement = createFocusSink(cellId);
			container.appendChild(upperWrapperElement);

			this.element = document.createElement('div');
			this.element.style.position = 'absolute';

			this.element.id = cellId;
			this.element.classList.add('cell_container');

			container.appendChild(this.element);
			this.element = this.element;

			const lowerWrapperElement = createFocusSink(cellId, true);
			container.appendChild(lowerWrapperElement);
		}