URL without "http|https"

I just learned from a colleague that omitting the "http | https" part of a URL in a link will make that URL use whatever scheme the page it's on uses.

So for example, if my page is accessed at http://www.example.com and I have a link (notice the '//' at the front):

<a href="//www.google.com">Google</a>

That link will go to http://www.google.com.

But if I access the page at https://www.example.com with the same link, it will go to https://www.google.com

I wanted to look online for more information about this, but I'm having trouble thinking of a good search phrase. If I search for "URLs without HTTP" the pages returned are about urls with this form: "www.example.com", which is not what I'm looking for.

Would you call that a schemeless URL? A protocol-less URL?

Does this work in all browsers? I tested it in FF and IE 8 and it worked in both. Is this part of a standard, or should I test more browsers?

Protocol relative URL

You may receive unusual security warnings in some browsers.

See also, Wikipedia Protocol-relative URLs for a brief definition.

At one time, it was recommended; but going forward, it should be avoided.

See also the Stack Overflow question Why use protocol-relative URLs at all?.

It is called network-path reference (the part that is missing is called scheme or protocol) defined in RFC3986 Section 4.2

> 4.2 Relative Reference > > A relative reference takes advantage of the hierarchical syntax > (Section 1.2.3) to express a URI reference relative to the name space > of another hierarchical URI. > > relative-ref = relative-part [ "?" query ] [ "#" fragment ] > > relative-part = "//" authority path-abempty > / path-absolute > / path-noscheme > / path-empty > > The URI referred to by a relative reference, also known as the target URI, is obtained by applying the reference resolution > algorithm of Section 5. > > A relative reference that begins with two slash characters is > termed a network-path reference (emphasis mine); such references are rarely used. > A relative reference that begins with a single slash character is termed an absolute-path reference. A relative reference that does not begin with a slash character is termed a relative-path reference. > > A path segment that contains a colon character (e.g., "this:that") cannot be used as the first segment of a relative-path reference, as it would be mistaken for a scheme name. Such a segment must be preceded by a dot-segment (e.g., "./this:that") to make a relative- path reference.