https://tucholski.pl/core/misc/details.js?v=11.1.5

1/**
2 * @file
3 * Additional functionality for HTML5 details elements.
4 */
5
6(function ($) {
7  /**
8   * Open parent details elements of a targeted page fragment.
9   *
10   * Opens all (nested) details element on a hash change or fragment link click
11   * when the target is a child element, in order to make sure the targeted
12   * element is visible. Aria attributes on the summary
13   * are set by triggering the click event listener in details-aria.js.
14   *
15   * @param {jQuery.Event} e
16   *   The event triggered.
17   * @param {jQuery} $target
18   *   The targeted node as a jQuery object.
19   */
20  const handleFragmentLinkClickOrHashChange = (e, $target) => {
21    $target.parents('details').not('[open]').find('> summary').trigger('click');
22  };
23
24  /**
25   * Binds a listener to handle fragment link clicks and URL hash changes.
26   */
27  $('body').on(
28    'formFragmentLinkClickOrHashChange.details',
29    handleFragmentLinkClickOrHashChange,
30  );
31
32  /**
33   * Binds a listener to handle required fields in details elements.
34   */
35  window.addEventListener(
36    'invalid',
37    (event) => {
38      if (event.target.matches('details input[required]')) {
39        handleFragmentLinkClickOrHashChange(event, $(event.target));
40      }
41    },
42    { capture: true },
43  );
44})(jQuery);