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TLS 1.0 and TLS 1.1 - Chrome Platform Status https://www.chromestatus.com/feature/5654791610957824

"Deprecate TLS 1.0 and 1.1, targeting removal in Chrome 81 (early 2020). During the deprecation period, sites using those protocols will show a warning in DevTools. After the deprecation period, in 2020, they will fail to connect if they have not upgraded to TLS 1.2 by then."
なるほどなー