iframe_parent.php
HTML 5 DTD
UTF-8 in meta tag
'use strict';
jquery-latest.min.js
c.js
(Check the JS console.)
<!DOCTYPE HTML>
<meta http-equiv='Content-type' content='text/html;charset=UTF-8' />
<script src='//code.jquery.com/jquery.min.js' ></script>
<script src='//includes.premo.biz/c.js' ></script>