Jquery Script Doesn't Work Properly In Ie

There is a jQuery script on my website with additional JS code. Example: Example: https://jsfiddle.net/kerm131/at5sL2jc/12/ It works fine in Google Chrome, Opera, Edge and Mozilla

Solution 1:

To make it works I add polyfill library:

<scriptsrc="https://cdn.polyfill.io/v2/polyfill.min.js"></script>

And change this:

targets.forEach(function (target) {
  return observer.observe(target, options);
});

to this:

[].forEach.call(targets, function (target) {
  return observer.observe(target, options);
});

(but I think it not necessary, first try without changing this string)