WordPress at a glance
filter is not described

customize_allowed_urls filter-hook . WP 3.4.0

Filters the list of URLs allowed to be clicked and followed in the Customizer preview.

Usage

add_filter( 'customize_allowed_urls', 'filter_function_name_6791' );
function filter_function_name_6791( $allowed_urls ){
	// filter...

	return $allowed_urls;
}
$allowed_urls(array)
An array of allowed URLs.

Where the hook is called

WP_Customize_Manager::get_allowed_urls()
customize_allowed_urls
wp-includes/class-wp-customize-manager.php 4450
$allowed_urls = array_unique( apply_filters( 'customize_allowed_urls', $allowed_urls ) );

Where the hook is used (in WP core)

Does not used.