<!-- range input system -->
   <!-- setInterval -->
   <!-- stopInterval -->
   <!-- stop watch -->
   <!-- object.keys -->
   <!-- object.values -->
   <!-- object.entries -->
   <!-- jquery hide  -->
   <!-- jquery show -->
   <!-- jquery slideShow -->
   <!-- jquery slideUp -->
   <!-- jquery toggle -->
   <!-- jquery slideToggle -->
   <!-- jquery fadeIn -->
   <!-- jquery fadeOut -->
   <!-- jquery fadeToggle -->