LiveAnnouncer LiveAnnouncer is used to announce messages for screen-reader users using an aria-live region. See the W3C's WAI-ARIA for more information on aria-live regions. Methods announce(message: string, politeness?: 'off' | 'polite' | 'assertive'): void Announce the given message via aria-live region. The politeness argument determines the aria-live attribute on the announcer element, default