I use this a lot for CSS animations and other advanced CSS work. It works everywhere but Firefox which is really disappointing. I'd really love to see Firefox support the CSS @property at-rule in the near future! https://developer.mozilla.org/en-US/docs/Web/CSS/@property
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Hi, thank you for reaching out!
Implementing @property at-rule is part of Interop 2023 - a cross-browser effort to improve the interoperability of the web (https://wpt.fyi/interop-2023)
The plan is to support this till the end of 2023
You can monitor progress on it in this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1684605
This is being worked on—feel free to track the progress in this bug and stay tuned for updates 😀