JavaScript Internet Explorer 11 erroneously triggers “input” event immediately

I was debugging a strange JavaScript issue, and noticed what I think might be a browser bug in IE11. I'm posting here on StackOverflow as a sanity-check -- and maybe to make sure that someone else with IE11 can reproduce this.

The issue is that when a hidden input's value contains a HTML entity, an input event is triggered on the element immediately on page load.

Take a look at this isolated reproduction here: http://dobt-misc.s3.amazonaws.com/ie_11_bug.html

The source code of the page:

<!doctype html>
<html>
<head>
  <script>
    document.addEventListener('DOMContentLoaded', function(){
      document.getElementById('foo').addEventListener('input', function(){
        alert('Crap!');
      });
    });
  </script>
</head>
<body>
  In IE11, refresh the page. You will see an alert, whereas in other browsers, you will not see an alert.

  <form>
    <input id="foo" type="hidden" name="utf8" value="&#x2713;" />
  </form>
</body>
</html>

Can someone help me confirm whether or not this is a browser bug? Or maybe I'm doing something wrong?

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