Deprecation of Legacy TLS 1.0 and 1.1 Versions | WebKit https://webkit.org/blog/8462/deprecation-of-legacy-tls-1-0-and-1-1-versions/
"Therefore, we are deprecating support for TLS 1.0 and 1.1. Complete support will be removed from Safari in updates to Apple iOS and macOS beginning in March 2020."