category_css_class

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Filters the list of CSS classes to include with each category in the list.

apply_filters( 'category_css_class', array $css_classes, object $category, int $depth, array $args )

$css_classes: (array) An array of CSS classes to be applied to each list item.
$category: (object) Category data object.
$depth: (int) Depth of page, used for padding.
$args: (array) An array of wp_list_categories() arguments.

Changelog
Version	Description
4.2.0	Introduced.