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Asked: 2026-06-18T03:37:24+00:00

Possible Duplicate: Is it valid to replace http:// with // in a <script src=http://…>?

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Possible Duplicate:
Is it valid to replace http:// with // in a <script src=“http://…”>?

I just saw //sub.sitename.com/thing/ in a url. Is this standard? I would assume it keeps the scheme (http vs https) when going to the other site but I don’t know. Is this standard? or a sin in the html world?

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1 Answer

  1. Editorial Team

    The answer is yes, this is standardized by RFC 3986 § 4.2:

    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.

    […]

    A relative reference that begins with two slash characters is termed
    a network-path reference; such references are rarely used.

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