Support calc() values in CSS Grid#34846
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nicoburns merged 2 commits intoservo:mainfrom Nov 14, 2025
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🔨 Triggering try run (#12643671693) for Linux WPT |
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Test results for linux-wpt-layout-2020 from try job (#12643817737): Flaky unexpected result (19)
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🔨 Triggering try run (#12680825926) for Linux WPT |
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Test results for linux-wpt-layout-2020 from try job (#12680825926): Flaky unexpected result (17)
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Test results for linux-wpt-layout-2020 from try job (#12681370403): Flaky unexpected result (18)
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✨ Try run (#12681370403) succeeded. |
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Based on the number of issues that are referring to this PR and the apparent websites that would visually look okay, this seems like a high value PR to me. I understand that it is blocked on the |
Signed-off-by: Nico Burns <[email protected]>
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My proposal would simply be to merge it as-is. Perhaps with some clarification to the SAFETY comment on the The comment at #34846 (comment) is still relevant. It is theoretically possible to make the Taffy API safe, and long-term I think it makes sense to make that happen (esp. as some similar changes would help with enabling parallel layout in Taffy). But it's a large piece of work (I'd estimate at least a couple of weeks, with risk of more if the initial versions causes performance regressions) for something that is a pure refactor (no additional functionality would be enabled), and I can't justify spending my time on that in the short term. If someone else wants to look it I can point them in the right direction. Finishing off DioxusLabs/taffy#855 would likely be the first piece. |
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🔨 Triggering try run (#19377414882) for Linux (WPT) |
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Test results for linux-wpt from try job (#19377414882): Flaky unexpected result (41)
Stable unexpected results that are known to be intermittent (33)
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Seems reasonable. I will try to review soon. |
mrobinson
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Nov 14, 2025
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Signed-off-by: Nico Burns <[email protected]>
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The failing subtest is for |
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🔨 Triggering try run (#19378334520) for Linux (WPT) |
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That was very soon! |
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Test results for linux-wpt from try job (#19378334520): Flaky unexpected result (39)
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✨ Try run (#19378334520) succeeded. |
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That was a lot quicker than I had expected. Glad to see this land, thanks folks! |
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Depends on:
calc()integration stylo#104In addition to that a
resolve_calc_valuefunction has been added which resolves calc values during the layout process once a percentage resolution basis is available.There is 1 newly failing test and 1 newly failing subtest here.These issues have now been fixed.There are 8 new subtest failures in
css/css-grid/grid-definition/grid-minimum-contribution-with-percentages.html. These are genuine failures, but are unrelated to the calc implementation. The calc implementation is just exposing a pre-existing bug around percentage resolution that also now correctly also applies tocalc()values containing percentages. The fix for would best be done in a followup as it requires teaching Taffy about "compressible replaced elements". (update: I have this implemented but in the interest of keeping it to one feature per PR I have not included it here)./mach build -ddoes not report any errors./mach test-tidydoes not report any errors. It doesn't like the git dependency on Taffy.