src/vs/workbench/contrib/notebook/browser/view/renderers/webviewPreloads.ts/OutputElement/constructor
class OutputElement:		constructor(
			private readonly outputId: string,
			left: number,
			public readonly cellId: string
		) {
			this.element = document.createElement('div');
			this.element.id = outputId;
			this.element.classList.add('output');
			this.element.style.position = 'absolute';
			this.element.style.top = `0px`;
			this.element.style.left = left + 'px';
			this.element.style.padding = '0px';

			addMouseoverListeners(this.element, outputId);
		}