https://www.leguerandais.fr/core/misc/details-aria.js?v=10.6.17

1/**
2 * @file
3 * Add aria attribute handling for details and summary elements.
4 */
5
6(function ($, Drupal) {
7  /**
8   * Handles `aria-expanded` and `aria-pressed` attributes on details elements.
9   *
10   * @type {Drupal~behavior}
11   */
12  Drupal.behaviors.detailsAria = {
13    attach() {
14      $(once('detailsAria', 'body')).on(
15        'click.detailsAria',
16        'summary',
17        (event) => {
18          const $summary = $(event.currentTarget);
19          const open =
20            $(event.currentTarget.parentNode).attr('open') === 'open'
21              ? 'false'
22              : 'true';
23
24          $summary.attr({
25            'aria-expanded': open,
26          });
27        },
28      );
29    },
30  };
31})(jQuery, Drupal);