/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at http://mozilla.org/MPL/2.0/. */

class ExistingElement extends HTMLElement {
  connectedCallback() {
    this.textContent = "existing test";
  }
}

customElements.define("existing-element", ExistingElement);