I am working on an old MVC application that is having problems displaying an @Html.DropDownListFor that has 15,000 rows in IE 11. I replaced the DopDownList with the jQuery autocomplete and it works great in the application.

The problem is that the application is also displayed in another web page in the organization in an iframe. The old DropDownList worked fine in the iframe, but since I replaced it with the autocomplete, it wont work. When text is typed in the autocomplete, nothing happens. I tried using IE11 dev tools but when I try to use a  breakpoint in the autocomplete code it is unreachable. Of course if I view the iframe in Chrome it works just fine.

Any ideas on why the autocomplete wont work in the iframe using IE11, but works ok in Chrome?