chrome://flags/#show-legacy-tls-warnings Show security warnings for sites using legacy TLS versions
Show security warnings for sites that use legacy TLS versions (TLS 1.0 and TLS 1.1), which are deprecated and will be removed in the future. – Mac, Windows, Linux, Chrome OS
chrome://flags/#legacy-tls-enforced Enforce deprecation of legacy TLS versions
Enable connection errors and interstitials for sites that use legacy TLS versions (TLS 1.0 and TLS 1.1), which are deprecated and will be removed in the future. – Mac, Windows, Linux, Chrome OS, Android