Tailwind CSS v4.0.4 — 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 v4.0.4. Source highlight: Fix a crash when setting JS theme values to `null` (#16210)

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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.

🔧 Bug Fixes & Patches (6)

Fix a crash when setting JS theme values to `null` (#16210)
Ensure escaped underscores in CSS variables in arbitrary values are properly unescaped (#16206)
Ensure that the `containers` JS theme key is added to the `--container-*` namespace (#16169)
Ensure theme `@keyframes` are generated even if an `--animation-*` variable spans multiple lines (#16237)
Vite: Skip parsing stylesheets with the `?commonjs-proxy` flag (#16238)
Fix `order-first` and `order-last` for Firefox (#16266)

📄 View Raw Release Notes (Original Developer Log)

### Fixed - Fix a crash when setting JS theme values to `null` ([#16210](https://github.com/tailwindlabs/tailwindcss/pull/16210)) - Ensure escaped underscores in CSS variables in arbitrary values are properly unescaped ([#16206](https://github.com/tailwindlabs/tailwindcss/pull/16206)) - Ensure that the `containers` JS theme key is added to the `--container-*` namespace ([#16169](https://github.com/tailwindlabs/tailwindcss/pull/16169)) - Ensure theme `@keyframes` are generated even if an `--animation-*` variable spans multiple lines ([#16237](https://github.com/tailwindlabs/tailwindcss/pull/16237)) - Vite: Skip parsing stylesheets with the `?commonjs-proxy` flag ([#16238](https://github.com/tailwindlabs/tailwindcss/pull/16238)) - Fix `order-first` and `order-last` for Firefox ([#16266](https://github.com/tailwindlabs/tailwindcss/pull/16266)) - Fix support for older instruction sets on Linux x64 builds of the standalone CLI ([#16244](https://github.com/tailwindlabs/tailwindcss/pull/16244)) - Ensure `NODE_PATH` is respected when resolving JavaScript and CSS files ([#16274](https://github.com/tailwindlabs/tailwindcss/pull/16274)) - Ensure Node addons are packaged correctly with FreeBSD builds ([#16277](https://github.com/tailwindlabs/tailwindcss/pull/16277)) - Fix an issue where `@variant` inside a referenced stylesheet could cause a stack overflow ([#16300](https://github.com/tailwindlabs/tailwindcss/pull/16300))

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