https://www.gesteau.fr/modules/contrib/webform/js/webform.element.radios.js?v=8.6.0-rc1

1/**
2 * @file
3 * JavaScript behaviors for radio buttons.
4 */
5
6(function ($, Drupal) {
7
8  'use strict';
9
10  /**
11   * Adds HTML5 validation to required radios buttons.
12   *
13   * @type {Drupal~behavior}
14   *
15   * @see Issue #2856795: If radio buttons are required but not filled form is nevertheless submitted.
16   */
17  Drupal.behaviors.webformRadiosRequired = {
18    attach: function (context) {
19      $('.js-webform-type-radios[required="required"], .js-form-type-webform-radios-other[required="required"]', context).each(function () {
20        $(this).find('input[type="radio"]').attr({'required': 'required', 'aria-required': 'true'});
21      });
22    }
23  };
24
25})(jQuery, Drupal);