I saw the
<img src="//remotesite.com/image1.jpg" />
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
@import, IE7 and IE8 download the file.
Here is a post written by Paul Irish on the subject: