Two other interop2023-relevant tests: https://wpt.fyi/results/css/css-backgrounds/animations/border-image-slice-interpolation.html?label=master&label=experimental&aligned&view=subtest&q=firefox%3Afail https://wpt.fyi/results/css/css-backgrounds/animations/border-image-source-interpolation.html?label=master&label=experimental&aligned&view=subtest&q=firefox%3Afail That last one (for `border-image-source`) has some tests that we fail but other browsers pass. It looks like that's because other browsers do have varying degrees of support for transitioning properties that are entirely discrete values, like `border-image-source`, I guess?
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Two other interop2023-relevant tests whose failures are this same issue: https://wpt.fyi/results/css/css-backgrounds/animations/border-image-slice-interpolation.html?label=master&label=experimental&aligned&view=subtest&q=firefox%3Afail https://wpt.fyi/results/css/css-backgrounds/animations/border-image-source-interpolation.html?label=master&label=experimental&aligned&view=subtest&q=firefox%3Afail That last one (for `border-image-source`) has some tests that we fail but other browsers pass. It looks like that's because other browsers do have varying degrees of support for transitioning properties that are entirely discrete values, like `border-image-source`, I guess?