In HTML when referencing images, css, javascript, etc... I sometimes use links without the http or https scheme portion, à la. <img src="//www.example.com/dir/file.gif" alt="" />
and I haven't had any browsers choke on it yet (that I know of). I've seen a few other public sites use it as well, but not many.
I even reference the Google jQuery CDN with this syntax on an e-commerce site:
<script src="//ajax.googleapis.com/ajax/.." type="text/javascript"></script>
Obviously, I only do this when I know the server has both http and https capabilities. (Usually my own sites)
So my question is what harm can this cause? What are the pitfalls or downsides?
A recent blog answered my question and sent me off to a couple places to learn more.
The answer is most definitely yes as long as you are aware of two things:
It will not harm anyway. Actually, if you write src="http://ajax.googleapis.com/ajax/.. and your user will browse site over HTTPS then browser will warn user that parts of the site uses HTTP. It is better to use // notation for such cases.
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