apply_filters( 'nav_menu_submenu_attributes', array $atts, stdClass $args, int $depth )

104		 *105		 *     @type string $class    HTML CSS class attribute.106		 * }107		 * @param stdClass $args      An object of `wp_nav_menu()` arguments.108		 * @param int      $depth     Depth of menu item. Used for padding.109		 */110		$atts       = apply_filters( 'nav_menu_submenu_attributes', $atts, $args, $depth );111		$attributes = $this->build_atts( $atts );112 113		$output .= "{$n}{$indent}<ul{$attributes}>{$n}";114	}115 116	/**