The upstream pull request was just merged. Once we've gotten a wpt.fyi upstream test-run with the updated tests, we should see Firefox passing all subtests on e.g. this test from comment 0 here: https://wpt.fyi/results/css/css-backgrounds/animations/border-image-width-interpolation.html?label=master&label=experimental&product=chrome&product=firefox&aligned&view=subtest&q=firefox%3Afail
Bug 1822203 Comment 7 Edit History
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The upstream pull request was just merged. Once we've gotten a wpt.fyi upstream test-run with the updated tests, we should see Firefox passing all subtests on e.g. this test from comment 0 here: https://wpt.fyi/results/css/css-backgrounds/animations/border-image-width-interpolation.html?label=master&label=experimental&product=chrome&product=firefox&aligned&view=subtest