Is script src=//example.com/file.js valid?

Question

Is it valid to do:

<script src="//example.com/file.js" />

instead of

<script src="http://example.com/file.js" />

or

<script src="https://example.com/file.js" />

The first is given as an example in facebook's documentation, and I'm wondering if its valid and if so, which browsers support it (all, or only the most recent, etc).

SLaks · Accepted Answer · 2012-04-25 13:53:00Z

4

That's called a protocol-relative URL.
It will become HTTP or HTTPS, depending on the protocol of the current page.

It works in all browsers.

answered Apr 25, 2012 at 13:53

SLaks

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Madara's Ghost · Accepted Answer · 2012-04-25 13:54:27Z

2

Yes, it's valid and it works too! This is what's called a Protocol Relative URL, which will use http:// or https:// based on the current page protocol.

answered Apr 25, 2012 at 13:54

Madara's Ghost

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