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/**
 * @license
 * Copyright (c) 2019 - 2024 Vaadin Ltd.
 * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
 */
import './vaadin-accordion-panel.js';
import { html, PolymerElement } from '@polymer/polymer/polymer-element.js';
import { defineCustomElement } from '@vaadin/component-base/src/define.js';
import { ElementMixin } from '@vaadin/component-base/src/element-mixin.js';
import { ThemableMixin } from '@vaadin/vaadin-themable-mixin/vaadin-themable-mixin.js';
import { AccordionMixin } from './vaadin-accordion-mixin.js';

/**
 * `` is a Web Component implementing accordion widget:
 * a vertically stacked set of expandable panels. The component should be
 * used as a wrapper for two or more `` components.
 *
 * Panel headings function as controls that enable users to open (expand)
 * or hide (collapse) their associated sections of content. The user can
 * toggle panels by mouse click, Enter and Space keys.
 *
 * Only one panel can be opened at a time, opening a new one forces
 * previous panel to close and hide its content.
 *
 * ```
 * 
 *   
 *     Panel 1
 *     This panel is opened, so the text is visible by default.
 *   
 *   
 *     Panel 2
 *     After opening this panel, the first one becomes closed.
 *   
 * 
 * ```
 *
 * ### Styling
 *
 * See the [``](#/elements/vaadin-accordion-panel)
 * documentation for the available state attributes and stylable shadow parts.
 *
 * **Note:** You can apply the theme to `` component itself,
 * especially by using the following CSS selector:
 *
 * ```
 * :host ::slotted(vaadin-accordion-panel) {
 *   margin-bottom: 5px;
 * }
 * ```
 *
 * See [Styling Components](https://vaadin.com/docs/latest/styling/styling-components) documentation.
 *
 * @fires {CustomEvent} items-changed - Fired when the `items` property changes.
 * @fires {CustomEvent} opened-changed - Fired when the `opened` property changes.
 *
 * @customElement
 * @extends HTMLElement
 * @mixes AccordionMixin
 * @mixes ElementMixin
 * @mixes ThemableMixin
 */
class Accordion extends AccordionMixin(ThemableMixin(ElementMixin(PolymerElement))) {
  static get template() {
    return html`
      
      
    `;
  }

  static get is() {
    return 'vaadin-accordion';
  }
}

defineCustomElement(Accordion);

export { Accordion };