Anchor positioning is part of Interop 2025. Firefox committed to shipping support for it this year: https://wpt.fyi/interop-2025

After that, it should take about 2.5 years for the feature to become Baseline widely available, and depending on your audience[0], you might be able to use it even sooner.

[0]: https://web.dev/blog/whats-my-baseline

There are already a few sites that don't work properly in Firefox, people started testing only for chrome because its market share is so big.

Really unfortunate because it lets Google get away with anything they want, they are the new standard. But then again, I'm reminded of how Mozilla has pissed away all the users goodwill, and it's not a surprise.

> Unless there is a polyfill for Firefox

Doesn't this count? Been there for several years.

https://github.com/oddbird/css-anchor-positioning