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Younes BerianeandRobin Malfait
931db16192
Fixes #20568. ## Summary The `@property` fallback is gated on `not (margin-trim: inline)`. The CSSWG removed the inline values (w3c/csswg-drafts#13731), and Safari Technology Preview now rejects them, so the fallback resets override utilities there. This switches to `margin-trim: block`. That value is still in the grammar and shipped with `@property` in [Safari 16.4](https://webkit.org/blog/13966/webkit-features-in-safari-16-4/), so the branch still matches only older Safari. Firefox's branch is unchanged. I did not use `at-rule(@property)`: browsers without `at-rule()` support would evaluate `not at-rule(…)` as true. ## Test plan - `pnpm vitest run packages/tailwindcss/src/index.test.ts -t 'fallback detection'`: fails on `main`, passes here. - `pnpm vitest run packages/tailwindcss`: 5107 passed, 1 skipped; snapshots updated for the new string. - Not run locally: the `@tailwindcss/postcss` tests and the integration tests (no oxide native build here). Prepared with AI assistance (Claude), reviewed and tested before submission. --------- Co-authored-by: Robin Malfait <robin.malfait@shopify.com>