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

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i saw //somepage.com/resource url format. example:

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

the point of if current page (the page defining img tag) using http, request remote site made via http. if https - it's https. eliminates browser warnings of not encrypted pages.

my question - url format safe use browsers. , standard?

is url format safe use browsers.

i can't sure, should able test in different browsers.

and standard?

technically, called "network path reference" according rfc 3986. here scheme it:

  relative-ref  = relative-part [ "?" query ] [ "#" fragment ]    relative-part = "//" authority path-abempty                 / path-absolute                 / path-noscheme                 / path-empty

there problem though, when used on <link> or @import, ie7 , ie8 download file.

here post written paul irish on subject:


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