I'm using this x-editable library, and it works really well. But I still have one problem.
In this x-editable page,in the use CDN section, you can see something like this
<link href="//cdnjs.cloudflare.com/ajax/libs/x-editable/1.5.0/bootstrap3-editable/css/bootstrap-editable.css" rel="stylesheet"/>
<script src="//cdnjs.cloudflare.com/ajax/libs/x-editable/1.5.0/bootstrap3-editable/js/bootstrap-editable.min.js"></script>
I'm tested examples and it works. And it seems that the above 2 lines instruct browser to fetch css and js files from http://cdnjs.cloudflare.com. My question is: Is there any difference between http:// and // here.