jQuery CDN with Fallbacks

footer.html

<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<script>window.jQuery || document.write('<script src="<?=site_url()?>assets/js/vendor/jquery-1.11.1.min.js"><\/script>')</script>
<!--
<script src="//code.jquery.com/jquery-migrate-1.2.1.min.js"></script>

<script src="https://code.jquery.com/ui/1.11.1/jquery-ui.min.js"></script>
<script>window.jQuery.ui || document.write('<script src="<?=site_url()?>assets/js/vendor/jquery-ui.min.js"><\/script>')</script>
-->