/**
 * Returns true when an iframe src may be rendered. Same-origin sources are
 * always allowed; cross-origin sources must match the embed allowlist. Pair with
 * sanitizeArticleHtml's `isAllowedIframeSrc` option.
 * @param {string} src - The iframe src attribute value.
 * @returns {boolean} True when the iframe may be kept.
 */
export declare const isAllowedIframeSrc: (src: string) => boolean;
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