src/vs/workbench/contrib/welcome/walkThrough/browser/walkThroughPart.ts/WalkThroughPart/addEventListener
class WalkThroughPart:	private addEventListener<E extends HTMLElement>(element: E, type: string, listener: EventListenerOrEventListenerObject, useCapture?: boolean): IDisposable {
		element.addEventListener(type, listener, useCapture);
		return toDisposable(() => { element.removeEventListener(type, listener, useCapture); });
	}