How to Change the Browser Tab Title When a User Leaves the Page in Webflow

(function() {
  var originalTitle = document.title;
  var messages = ['👋 We miss you!', '⚡ We’ve got something new...', originalTitle];
  var idx = 0, interval;
  document.addEventListener('visibilitychange', function() {
    if (document.hidden) {
      interval = setInterval(function() {
        document.title = messages[idx % messages.length];
        idx++;
      }, 1500);
    } else {
      clearInterval(interval);
      document.title = originalTitle;
      idx = 0;
    }
  });
})();