/** * Polyfills the `focusgroup` HTML attribute for the given element and its * descendants. * * @param {HTMLElement} root - The polyfill target. Defaults to ``. */ export declare function polyfill(root: HTMLElement): void; /** * Polyfills all potential focusgroups in `document.body`, observes DOM changes, * and polyfills any newly added focusgroups. */ export declare function polyfillBodyAndObserve(): void;