https://adambrown.info/p/wp_hooks/hook/nav_menu_css_class?version=5.6&file=wp-includes/class-walker-nav-menu.php
nav_menu_css_class hook - WordPress source view -- Adam Brown, BYU Political Science
Detailed information about every action hook and filter used in WordPress. Makes Plugin API easier to use. Lists appearance, file location, and deprecation...
menu css classadam brownpolitical sciencenavhook