FWIW IanK is updating WPT tests to reflect this spec change, in https://github.com/web-platform-tests/wpt/pull/40710 If I'm not mistaken: those test changes make current Firefox Nightly newly fail ~27 interop-2023-relevant tests in the `css/css-grid/abspos` directory. [details follow, for folks curious about metrics/score] Results with the current test set: we pass 169.5 / 171 score-relevant tests in that directory: https://wpt.fyi/results/css/css-grid/abspos?sha=2cf035c769&label=experimental&label=master&product=chrome&product=firefox&view=interop&q=label%3Ainterop-2021-grid%20or%20label%3Ainterop-2023-grid Results with IanK's PR: we pass 28.57 / 57 of the tests in that directory (i.e. we fail 28.43 tests) -- note that not all of the tests were run, but of the ones that were, we fail 28.43 of them: https://wpt.fyi/results/css/css-grid/abspos?sha=5fcd4da0c2&label=pr_head&label=experimental&product=chrome&product=firefox&view=interop&q=label%3Ainterop-2021-grid%20or%20label%3Ainterop-2023-grid So that indicates that we're going from 1.5 test-failures in that directory to 28.43 test-failures, which represents 26.93 new test failures. Assuming the total number of tests remains the same for the "grid" focus area (current total: 1043), these new test failures represent a 26.93 / 1043 = ~2.6% regression in our score for the grid focus area.
Bug 1838501 Comment 2 Edit History
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FWIW IanK is updating WPT tests to reflect this spec change, in https://github.com/web-platform-tests/wpt/pull/40710 If I'm not mistaken: those test changes make current Firefox Nightly newly fail ~27 interop-2023-relevant tests in the `css/css-grid/abspos` directory. [details follow, for folks curious about metrics/score] Results with the current test set: we pass 169.5 / 171 score-relevant tests in that directory: https://wpt.fyi/results/css/css-grid/abspos?sha=2cf035c769&label=experimental&label=master&product=chrome&product=firefox&view=interop&q=label%3Ainterop-2021-grid%20or%20label%3Ainterop-2023-grid Results with IanK's PR: we pass 28.57 / 57 of the tests in that directory (i.e. we fail 28.43 tests) -- note that not all of the tests were run, but of the ones that were, we fail 28.43 of them: https://wpt.fyi/results/css/css-grid/abspos?sha=5fcd4da0c2&label=pr_head&label=experimental&product=chrome&product=firefox&view=interop&q=label%3Ainterop-2021-grid%20or%20label%3Ainterop-2023-grid So that indicates that we're going from 1.5 test-failures in that directory to 28.43 test-failures, which represents 26.93 new test failures. Assuming the total number of tests remains the same for the "grid" focus area (current total: 1043), these new test failures represent a 26.93 / 1043 = ~2.6% regression in our score for the grid focus area, which represents a ~0.1% regression in the overall top-level score (dividing 2.6% by 26 since there are 26 equally-weighted focus areas).