If you have access to the other site and the Access-Control-Allow-Origin header is present, then jQuery can be used like this:
$.get('https://stackoverflow.com/questions').then(function (html) {
// Success response
var $mainbar = $(html).find('#mainbar');
document.write($mainbar.html());
}, function () {
// Error response
document.write('Access denied');
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
