/**
 * Build the explanatory text to be placed before the aria live regions.
 *
 * This text is initially hidden from assistive technologies by using a `hidden`
 * HTML attribute which is then removed once a message fills the aria-live regions.
 *
 * @return {HTMLParagraphElement} The explanatory text HTML element.
 */
export default function addIntroText(): HTMLParagraphElement;
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