Each AWS partition can have its own browser support SLA. China's AWS console has its own [1], although it almost overlaps completely with the "classic" AWS console [2].

For the government/secret partition, I have no clue what their SLA is, but it wouldn't be a leap to assume they may something different.

1: https://www.amazonaws.cn/en/management-console/faqs/

2: https://aws.amazon.com/premiumsupport/knowledge-center/brows...