Chrome appears to be first to have hit all the 2024 Interop #accessibility test goals:
https://web.dev/blog/interop-2024-a11y
Interop tests (which you can read to balance against the Chrome claim):
https://wpt.fyi/results/?label=experimental&label=master&aligned&view=interop&q=label%3Ainterop-2024-accessibility
While I want more (more done, more aggressive goals, etc), this is good. Kudos to the team for getting there.