IE11 ignoring script

IE11 ignoring script

I have the following submitHandler that's being ignored by IE only... IE11 in my case. The form data is passing through to our database, but the modal doesn't hide and the window/tab to the downloads page doesn't open. Any ideas? 

  2. submitHandler: function(form) {
  3.   HTMLFormElement.prototype.submit.call(form);
  4.   $('#modalForm').modal('hide');
  5.   window.open("http://www.foo.com/downloads");
  6. }