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

Filters the HTML attributes applied to a menu list element.

Parameters

$attsarray

The HTML attributes applied to the <ul> element, empty strings are ignored.

$argsstdClass

An object of wp_nav_menu() arguments.

$depthint

Depth of menu item. Used for padding.

$atts       = apply_filters( 'nav_menu_submenu_attributes', $atts, $args, $depth );

Used by	Description
Walker_Nav_Menu::start_lvl()`wp-includes/class-walker-nav-menu.php`	Starts the list before the elements are added.

Version	Description
6.3.0	Introduced.

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