Chrome, as of 132, finally has keyboard support for scrolling containers:
adrianroselli.com/2022/06/keyb…
This assumes it doesn’t get rolled back again, as it has every other time it was deployed since 2018.
Silence from Safari.
Keyboard-Only Scrolling Areas
I have spent a few years banging on about ensuring scrolling areas on a page are accessible to keyboard-only users.Adrian Roselli