Jquery function to change browser tab title when browser tab is not active

changing-tab-title.js

jQuery(document).ready(function( $ ){
    
    // Get page title
      var pageTitle = $("title").text();

    // Change page title on blur
    $(window).on('blur', function() {
        $("title").text('💔 Vous nous manquez !');
    });

    // Change page title back on focus
    $(window).on('focus', function() {
      $("title").text(pageTitle);
    });

});