How to undo property and return original property via JS?

Question

RAM

The first is that there is input[files], after selecting a file, a counter of how many files are selected is shown.

example

The question is how to reset Selected files: n after I pressed the button (send) on the default value of Upload Files

And the second one I added an additional active class to one class
I want it to work for, for example, 10 seconds, after which the additional class was removed, like this implement

$('.button').click(function(event){
      $('.loader, .loader1').toggleClass('active');
      
  });

Here is the code https://codepen.io/pen/NWqYYmY

Answer 1

1.35 in this scenario may not work. It is better to look for a service manual by model; there may be compatible options.

Answer 2

First: do form.reset;
second, use: window.setTimeout