/**
 * Checks whether the specified element is disabled.
 * @param {Element} el The element to check.
 */
export declare function isDisabledElement(el: Element): el is HTMLElement;
/**
 * Checks whether the specified element is hidden.
 * @param {Element} el The element to check.
 */
export declare function isHiddenElement(el: Element): el is HTMLElement;
/**
 * Checks whether the specified element is focusable.
 * @param {Element} el The element to check.
 */
export declare function isFocusableElement(el: Element): el is HTMLElement;
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