bootstrap-8.x-3.23/templates/menu/menu--main.html.twig

{#
/**
 * @file
 * Default theme implementation to display a menu.
 *
 * Available variables:
 * - classes: A list of classes to apply to the top level <ul> element.
 * - dropdown_classes: A list of classes to apply to the dropdown <ul> element.
 * - menu_name: The machine name of the menu.
 * - items: A nested list of menu items. Each menu item contains:
 *   - attributes: HTML attributes for the menu item.
 *   - below: The menu item child items.
 *   - title: The menu link title.
 *   - url: The menu link url, instance of \Drupal\Core\Url
 *   - localized_options: Menu link localized options.
 *
 * @ingroup templates
 */
#}
{% extends "menu.html.twig" %}
{%
  set classes = [
    'menu',
    'menu--' ~ menu_name|clean_class,
    'nav',
    'navbar-nav',
  ]
%}