src/vs/base/browser/ui/aria/aria.ts/createAlertContainer
export function setARIAContainer(parent: HTMLElement) {
	ariaContainer = document.createElement('div');
	ariaContainer.className = 'monaco-aria-container';

	const createAlertContainer = () => {
		const element = document.createElement('div');
		element.className = 'monaco-alert';
		element.setAttribute('role', 'alert');
		element.setAttribute('aria-atomic', 'true');
		ariaContainer.appendChild(element);
		return element;
	};
	alertContainer = createAlertContainer();
	alertContainer2 = createAlertContainer();

	const createStatusContainer = () => {
		const element = document.createElement('div');
		element.className = 'monaco-status';
		element.setAttribute('role', 'complementary');
		element.setAttribute('aria-live', 'polite');
		element.setAttribute('aria-atomic', 'true');
		ariaContainer.appendChild(element);
		return element;
	};
	statusContainer = createStatusContainer();
	statusContainer2 = createStatusContainer();

	parent.appendChild(ariaContainer);
}