Because complaining about "mixed content" was completely pointless in the general case -- you could mix content across multiple https sites, but the certificat

Because complaining about "mixed content" was completely pointless in the general case -- you could mix content across multiple https sites, but the certificates were never correlated, and the second site would still get all the headers just the same. It's extraordinarily user-hostile, and would just add to the pile of pointless wankery that keeps people from using https (see also: shitting all over self-signed certs when in reality the CAs don't do shit for their rent and identity is useless anyway). The actual solution is to never send Referer headers for cross-site requests from an HTTPS page.