This is Google and Mozilla aligning with Apple's earlier announcement (https://support.apple.com/en-us/HT211025 https://support.apple.com/en-us/HT211025). The

This is Google and Mozilla aligning with Apple's earlier announcement (https://support.apple.com/en-us/HT211025 https://support.apple.com/en-us/HT211025). The CABF has talked about doing this before, most recently in SC22 (https://cabforum.org/2019/09/10/ballot-sc22-reduce-certificate-lifetimes-v2/ https://cabforum.org/2019/09/10/ballot-sc22-reduce-certifica...). In that case all browsers supported it, but it wasn't passed by the CA side.