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Editorial Team
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Editorial Team
Asked: June 3, 20262026-06-03T14:47:09+00:00 2026-06-03T14:47:09+00:00

Possible Duplicate: Is it valid to replace with // in a <script src=“…”>? I’ve

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Possible Duplicate:
Is it valid to replace with // in a <script src=“…”>?

I’ve been seeing sites linking to CSS and JS without the protocol more and more often lately:

<script src="//domain.cloudfront.net/file.js" type="text/javascript"></script>

And CSS

<link href="//domain.cloudfront.net/styles.css" media="screen" rel="stylesheet" type="text/css" />

Is this valid in all browsers? Does leaving off http or https mean the browser intelligently decides which protocol to use?

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  1. Editorial Team
    Editorial Team
    2026-06-03T14:47:10+00:00Added an answer on June 3, 2026 at 2:47 pm

    Yup. Paul Irish has a good blog entry about this. http://paulirish.com/2010/the-protocol-relative-url/

    It’s basic purpose is to prevent those IE pop ups that warn you that some of the resources on the page are “non-secure” when your main protocol is https but you grab something with http.

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