Tailwind CSS v4.0.9 — 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

🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Tailwind CSS v4.0.9. Source highlight: Make JS APIs available to plugins and configs in the Standalone CLI (#15934)

Visit Tailwind CSS Official Site ↗ Official Release Source ↗ All Tailwind CSS Releases 📡 Tailwind CSS RSS

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.

🔧 Bug Fixes & Patches (6)

Make JS APIs available to plugins and configs in the Standalone CLI (#15934)
Vite: Don't crash when importing a virtual module from JavaScript that ends in `.css` (#16780)
Fix an issue where `@reference "…"` would sometimes omit keyframe animations (#16774)
Ensure `z-*!` utilities are properly marked as `!important` (#16795)
Read UTF-8 CSS files that start with a byte-order mark (BOM) (#16800)
Ensure nested functions in selectors used with JavaScript plugins are not truncated (#16802)

📄 View Raw Release Notes (Original Developer Log)

### Fixed - Make JS APIs available to plugins and configs in the Standalone CLI ([#15934](https://github.com/tailwindlabs/tailwindcss/pull/15934)) - Vite: Don't crash when importing a virtual module from JavaScript that ends in `.css` ([#16780](https://github.com/tailwindlabs/tailwindcss/pull/16780)) - Fix an issue where `@reference "…"` would sometimes omit keyframe animations ([#16774](https://github.com/tailwindlabs/tailwindcss/pull/16774)) - Ensure `z-*!` utilities are properly marked as `!important` ([#16795](https://github.com/tailwindlabs/tailwindcss/pull/16795)) - Read UTF-8 CSS files that start with a byte-order mark (BOM) ([#16800](https://github.com/tailwindlabs/tailwindcss/pull/16800)) - Ensure nested functions in selectors used with JavaScript plugins are not truncated ([#16802](https://github.com/tailwindlabs/tailwindcss/pull/16802)) ### Changed - Emit variable fallbacks when using `@reference "…"` instead of duplicate CSS variable declarations ([#16774](https://github.com/tailwindlabs/tailwindcss/pull/16774))

← Older Version Tailwind CSS v4.0.8 Newer Version → Tailwind CSS v4.0.10