As best I can recall, that test comes about because keyframes from CSS animations (unlike Web Animations) contain only computed properties and hence all `var()` references are resolved. At the time (and now too, unfortunately), Firefox didn't support registered custom properties ([Mozilla bug](https://bugzilla.mozilla.org/show_bug.cgi?id=1273706)) so there was no need to keep custom properties around. With registered custom properties, it definitely makes sense to keep them around. -- GitHub Notification of comment by birtles Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5126#issuecomment-635787679 using your GitHub accountReceived on Friday, 29 May 2020 06:31:41 UTC
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