Content Security Policy Level 3

Content Security Policy Level 3

1.3. Changes from Level 2
（中略）3. Insecure schemes in source expressions now match their secure variants. That is, http: is equivalent to http: https:, and http://a.com to http://a.com https://a.com.

これでhttpとhttpsの両方を書かなくて良くなる。いつごろから普及するのだろう？