Tailwind CSS v4.1.15 — 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 v4.1.15. Source highlight: Fix Safari devtools rendering issue due to `color-mix` fallback (#19069)

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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 Safari devtools rendering issue due to `color-mix` fallback (#19069)
Suppress Lightning CSS warnings about `:deep`, `:slotted`, and `:global` (#19094)
Fix resolving theme keys when starting with the name of another theme key in JS configs and plugins (#19097)
Allow named groups in combination with `not-*`, `has-*`, and `in-*` (#19100)
Prevent important utilities from affecting other utilities (#19110)
Don’t index into strings with the `theme(…)` function (#19111)

📄 View Raw Release Notes (Original Developer Log)

### Fixed - Fix Safari devtools rendering issue due to `color-mix` fallback ([#19069](https://github.com/tailwindlabs/tailwindcss/pull/19069)) - Suppress Lightning CSS warnings about `:deep`, `:slotted`, and `:global` ([#19094](https://github.com/tailwindlabs/tailwindcss/pull/19094)) - Fix resolving theme keys when starting with the name of another theme key in JS configs and plugins ([#19097](https://github.com/tailwindlabs/tailwindcss/pull/19097)) - Allow named groups in combination with `not-*`, `has-*`, and `in-*` ([#19100](https://github.com/tailwindlabs/tailwindcss/pull/19100)) - Prevent important utilities from affecting other utilities ([#19110](https://github.com/tailwindlabs/tailwindcss/pull/19110)) - Don’t index into strings with the `theme(…)` function ([#19111](https://github.com/tailwindlabs/tailwindcss/pull/19111)) - Fix parsing issue when `\t` is used in at-rules ([#19130](https://github.com/tailwindlabs/tailwindcss/pull/19130)) - Upgrade: Canonicalize utilities containing `0` values ([#19095](https://github.com/tailwindlabs/tailwindcss/pull/19095)) - Upgrade: Migrate deprecated `break-words` to `wrap-break-word` ([#19157](https://github.com/tailwindlabs/tailwindcss/pull/19157)) ### Changed - Remove the `postinstall` script from oxide ([#19149](https://github.com/tailwindlabs/tailwindcss/pull/19149))

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