Why use protocol-relative URLs at all?

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As of December 2014, Paul Irish’s blog on protocol-relative URLs says:

2014.12.17: Now that SSL is encouraged for everyone and doesn’t have performance concerns, this technique is now an anti-pattern. If the asset you need is available on SSL, then always use the https:// asset.

Unless you have specific performance concerns (such as the slow mobile network mentioned in Zakjan’s answer) you should use https:// to protect your users.

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