How to show a window to a person only once?

Question

JavaScript

Good afternoon!
There is a popup window, I need it to be displayed only in the mobile version and only once.

How can I make it so that if the person closes the window, it won't show again until they close the browser?

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$(document).ready(function() {    
          if ($(window).width() < 768 ) {    
    		$('#mobile').show();   
    	$('#mobile span').click(function() {
    		$('#mobile').hide();
    	});
    }        
    	});

Answer 1

$(document).ready(function() {
  if ($(window).width() < 768) {
    if (localStorage.getItem("modal") != "off") {
      $("#mobile").show();
    }
    $("#mobile span").click(function() {
      $("#mobile").hide();
      localStorage.setItem("modal", "off");
    });
  }
});

If it will be necessary not forever, but before closing the browser tab, then replace localStorage with sessionStorage

Answer 2

If it does not close the browser yet, then Session Storage