Kirki_Fonts::get_backup_fonts PHP Method

        public static function get_backup_fonts()
        {
            $backup_fonts = array('sans-serif' => 'Helvetica, Arial, sans-serif', 'serif' => 'Georgia, serif', 'display' => '"Comic Sans MS", cursive, sans-serif', 'handwriting' => '"Comic Sans MS", cursive, sans-serif', 'monospace' => '"Lucida Console", Monaco, monospace');
            return apply_filters('kirki/fonts/backup_fonts', $backup_fonts);
        }

 /**
  * The class constructor.
  */
 private function __construct()
 {
     if (is_null(self::$google_fonts)) {
         self::$google_fonts = Kirki_Fonts::get_google_fonts();
     }
     if (is_null(self::$backup_fonts)) {
         self::$backup_fonts = Kirki_Fonts::get_backup_fonts();
     }
 }