Tailwind CSS v4.0.1 — Release Notes & Engineering Impact

Source available — automated, not human-reviewed

Component: tailwind · Channel: stable. Automated analysis, not a compatibility certification. How this works.

Analysis updated: 2026-11-01.

Compatibility not verified — check source notes

$ npm install --save-exact [email protected]

📄 .MD

✨ Features 1 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Tailwind CSS v4.0.1. Source highlight: Include `:open` pseudo-class in existing `open` variant (#15349)

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Who Does This Impact? (Role-Based Analysis)

💻 Software Engineers & Devs

Check the source notes against the package and APIs you use before upgrading.

📊 Product & Engineering Leads

Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.

⚙️ DevOps & Security

Verify the target version, runtime requirements and rollback procedure in the official documentation.

✨ New Features & Capabilities (1)

Include `:open` pseudo-class in existing `open` variant (#15349)

🔧 Bug Fixes & Patches (6)

Remove invalid `min-w/h-none` utilities (#15845)
Discard CSS variable shorthand utilities that don't use valid CSS variables (#15738)
Ensure font-size utilities with `none` modifier have a line-height set e.g. `text-sm/none` (#15921)
Ensure font-size utilities with unknown modifier don't generate CSS (#15921)
Don’t suggest font weight utilities more than once (#15857)
Suggest container query variants (#15857)

📄 View Raw Release Notes (Original Developer Log)

### Added - Include `:open` pseudo-class in existing `open` variant ([#15349](https://github.com/tailwindlabs/tailwindcss/pull/15349)) ### Fixed - Remove invalid `min-w/h-none` utilities ([#15845](https://github.com/tailwindlabs/tailwindcss/pull/15845)) - Discard CSS variable shorthand utilities that don't use valid CSS variables ([#15738](https://github.com/tailwindlabs/tailwindcss/pull/15738)) - Ensure font-size utilities with `none` modifier have a line-height set e.g. `text-sm/none` ([#15921](https://github.com/tailwindlabs/tailwindcss/pull/15921)) - Ensure font-size utilities with unknown modifier don't generate CSS ([#15921](https://github.com/tailwindlabs/tailwindcss/pull/15921)) - Don’t suggest font weight utilities more than once ([#15857](https://github.com/tailwindlabs/tailwindcss/pull/15857)) - Suggest container query variants ([#15857](https://github.com/tailwindlabs/tailwindcss/pull/15857)) - Disable bare value suggestions when not using the `--spacing` variable ([#15857](https://github.com/tailwindlabs/tailwindcss/pull/15857)) - Ensure suggested classes are properly sorted ([#15857](https://github.com/tailwindlabs/tailwindcss/pull/15857)) - Don’t look at .gitignore files outside initialized repos ([#15941](https://github.com/tailwindlabs/tailwindcss/pull/15941)) - Find utilities when using the Svelte class shorthand syntax across multiple lines ([#15974](https://github.com/tailwindlabs/tailwindcss/pull/15974)) - Find utilities when using the Angular class shorthand syntax ([#15974](https://github.com/tailwindlabs/tailwindcss/pull/15974)) - Find utilities when using functions inside arrays ([#15974](https://github.com/tailwindlabs/tailwindcss/pull/15974)) - Ensure that `@tailwindcss/browser` does not pollute the global namespace ([#15978](https://github.com/tailwindlabs/tailwindcss/pull/15978)) - Ensure that `tailwind-merge` is not scanned when using the Vite plugin ([#16005](https://github.com/tailwindlabs/tailwindcss/pull/16005)) - Ensure CSS theme variables are available within shadow roots ([#15975](https://github.com/tailwindlabs/tailwindcss/pull/15975)) - Fix crash when project lives in the `/` directory ([#15988](https://github.com/tailwindlabs/tailwindcss/pull/15988)) - Ensure custom variants have a non-empty selector list ([#16009](https://github.com/tailwindlabs/tailwindcss/pull/16009)) - _Upgrade_: Ensure JavaScript config files on different drives are correctly migrated ([#15927](https://github.com/tailwindlabs/tailwindcss/pull/15927)) - _Upgrade_: Migrate `leading-[1]` to `leading-none` ([#16004](https://github.com/tailwindlabs/tailwindcss/pull/16004)) - _Upgrade_: Do not migrate arbitrary leading utilities to bare values ([#16004](https://github.com/tailwindlabs/tailwindcss/pull/16004))

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