Bozho Bozho - 5 months ago 17
HTML Question

Absolute URLs omitting the protocol (scheme) in order to preserve the one of the current page

I saw the

//somepage.com/resource
url format. For example:

<img src="//remotesite.com/image1.jpg" />


The point of this is that if the current page (the page defining the
img
tag) is using
http
, then the request to the remote site is made via http. If it is https - it's https. This eliminates browser warnings of not fully encrypted pages.

My question is - is this URL format safe to use for all browsers. And is it a standard?

Answer

is this URL format safe to use for all browsers.

I can't say anything for sure, but you should be able to test it in different browsers.

And is it a standard?

Technically, it is called "network path reference" according to RFC 3986. Here is the scheme for it:

  relative-ref  = relative-part [ "?" query ] [ "#" fragment ]

  relative-part = "//" authority path-abempty
                / path-absolute
                / path-noscheme
                / path-empty

There is a problem though, when used on a <link> or @import, IE7 and IE8 download the file.

Here is a post written by Paul Irish on the subject:

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