Chrome shipped this in v132 per: https://chromestatus.com/feature/5231964663578624

Safari is still broken: https://bugs.webkit.org/show_bug.cgi?id=277290
But there is a pull request for fixing this submitted on: 2026-06-06

So maybe this will be fixed at the browser level??

Polyfill is available: https://github.com/Th3S4mur41/scroll-focus-polyfill

Download/checkin https://unpkg.com/scroll-focus-polyfill and add _static/scroll-focus-polyfill.js to script_files list in layout.html. Docs should be self contained, so no 3rd party sources.