Filters the CSS class(es) applied to a menu list element.
Parameters
$classes
string[]
Array of the CSS classes that are applied to the menu <ul> element.
$args
stdClass
An object of wp_nav_menu() arguments.
$depth
int
Depth of menu item. Used for padding.
Source
File: wp-includes/class-walker-nav-menu.php.
View all references
$class_names = implode( " ", apply_filters( "nav_menu_submenu_css_class", $classes, $args, $depth ) );