WordPress at a glance
action is not described

admin_print_styles-(hook_suffix) action-hook . WP 2.6.0

Fires when styles are printed for a specific admin page based on $hook_suffix.

Usage

add_action( 'admin_print_styles-(hook_suffix)', 'action_function_name_2676' );
function action_function_name_2676(){
	// action...
}

Changelog

Since 2.6.0 Introduced.

Where the hook is called

In file: /wp-admin/admin-header.php
admin_print_styles-(hook_suffix)
wp-admin/admin-header.php 111
do_action( "admin_print_styles-{$hook_suffix}" ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
wp-admin/includes/template.php 1985
do_action( "admin_print_styles-{$hook_suffix}" );  // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores

Where in WP core the hook is used

wp-admin/includes/class-custom-image-header.php 79
add_action( "admin_print_styles-{$page}", array( $this, 'css_includes' ) );