src/vs/base/browser/ui/list/listWidget.ts/AccessibiltyRenderer/renderElement
class AccessibiltyRenderer:	renderElement(element: T, index: number, container: HTMLElement): void {
		const ariaLabel = this.accessibilityProvider.getAriaLabel(element);

		if (ariaLabel) {
			container.setAttribute('aria-label', ariaLabel);
		} else {
			container.removeAttribute('aria-label');
		}

		const ariaLevel = this.accessibilityProvider.getAriaLevel && this.accessibilityProvider.getAriaLevel(element);

		if (typeof ariaLevel === 'number') {
			container.setAttribute('aria-level', `${ariaLevel}`);
		} else {
			container.removeAttribute('aria-level');
		}
	}