/**
 * ---
 * category: utilities/DOM
 * ---
 *
 * Check whether an element is a defined custom element. (if it was defined with `customElements.define`)
 * @module isDefinedCustomElement
 * @param { Element } el - the element to check
 * @return { Boolean } whether the element is a custom element or not
 */
declare function isDefinedCustomElement(el: Element): boolean;
export { isDefinedCustomElement };
export default isDefinedCustomElement;
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