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Robin Malfait 7ff413bad4
Ignore unknown at-rule warnings for @position-try (#20277) 
This PR ignores Lightning CSS warnings for the unknow at-rule
`@position-try`.

This is a temporary fix/workaround until support for `@position-try`
lands in Lightning CSS:
https://github.com/parcel-bundler/lightningcss/pull/1238

Fixes: #20275

## Test plan

Ran a test based on the issue:

Before:
```shellsession
❯ tw -i x.css -o out.css --optimize
≈ tailwindcss v4.3.1

Found 1 warning while optimizing generated CSS:

│   position-try-fallbacks: --flip-above;
│ }
│ @position-try --flip-above {
┆              ^-- Unknown at rule: @position-try
┆
│   top: auto;
│   bottom: 0;

Done in 29ms
```

After:
```shellsession
❯ tw -i x.css -o out.css --optimize
≈ tailwindcss v4.3.1

Done in 14ms
```
2026-06-25 13:21:12 +02:00
..
src Ignore unknown at-rule warnings for @position-try (#20277) 2026-06-25 13:21:12 +02:00
package.json 4.3.1 (#20226) 2026-06-12 19:33:35 +02:00
README.md docs: update package README CI badge to main (#19692) 2026-02-18 11:52:07 +01:00
tsconfig.json Bump dependencies (#19957) 2026-04-24 21:21:12 +02:00
tsup.config.ts Show Lightning CSS warnings when optimizing/minifying in production (#18918) 2025-09-12 12:27:23 +02:00

README.md

Tailwind CSS

A utility-first CSS framework for rapidly building custom user interfaces.

Build Status Total Downloads Latest Release License

Documentation

For full documentation, visit tailwindcss.com.

Community

For help, discussion about best practices, or feature ideas:

Discuss Tailwind CSS on GitHub

Contributing

If you're interested in contributing to Tailwind CSS, please read our contributing docs before submitting a pull request.