What is the difference between href="//..." and href="https://..."

Question

I often see href="//any.cdn.com" and ask me if there's a difference or benefit to use this notation over href="https://any.cdn.com"?

Answer 1

The first will inherit the scheme being served by your site (are you using http, https, etc.), the latter is explicit.

More information can be found here https://jeremywagner.me/blog/stop-using-the-protocol-relative-url/