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v4.6.6 (2026-06-14)
Changes
#4450 fix: use printf for PR body to avoid YAML indentation error in run block (@matthew-dean)
#4449 fix: correct push event typo in create-release-pr workflow (pus → push:) (@matthew-dean)
#4446 fix: avoid TypeError on nested @supports with dumpLineNumbers (@sarathfrancis90)
#4441 Preserve spacing for container feature functions (@puneetdixit200)
#4440 chore: prevent dependency lifecycle scripts (@puckowski)
#4437 docs: fix incorrect contributor attributions in v4.6.0 changelog (@barry3406)
#4434 fix(issue#4316): color calc inside from expression (@puckowski)
v4.6.5 (2026-06-13)
Bug Fixes
#4444 Fix browser export interop by routing bundlers to CJS-typed UMD artifact (@Copilot)
#4427 Fix parenthesis in media query (@puckowski)
#4421 Fix not keyword silently ignored when used without parentheses in conditions (@Copilot)
#4426 Upgrade make-dir to v4 to fix security vulnerability (@jorenbroekema)
Maintenance
#4447 Automate CHANGELOG generation in release workflow (@matthew-dean)
#4448 Add continue-on-error to copilot-review CI job (@matthew-dean)
#4445 Fix Playwright chromium install hang on Node current/lts/* (@matthew-dean)
#4431 PR-based release flow for alpha branches (@Copilot)
#4430 Ensure npm publish is always backed by a GitHub tag, release, and version-bump commit (@Copilot)
#4432 Update packageManager to pnpm@9.15.9 to match lockfileVersion 9.0 (@Copilot)
#4420 Regression test for @container mixin parameter variable resolution (@Copilot)
v4.6.4 (2026-03-13)
Tests
#4422 Add coverage for :is()/:matches()/:where() containing nested :has() selectors and comma-separated lists (@Copilot)
v4.6.3 (2026-03-11)
Bug Fixes
#4424 Fix webpack browser build - use UMD dist/less.js, add CJS bundle (@matthew-dean)
v4.4.2 (2025-10-07)
#4357 Migrate Less test data to use valid CSS (@matthew-dean)
#4363 Fix [#4362] no spacing regression for function (@puckowski)
v4.4.1 (2025-08-25)
#4342 Add support for CSS scroll state container queries (@puckowski)
#4349 Fix #4348 parse layer nesting syntax (@puckowski)
### v4.4.0 (2025-05-31)
- [#4337](https://github.com/less/less.js/pull/4337) Add support for layer at-rule (@puckowski)
- [#4340](https://github.com/less/less.js/pull/4340) Add support for import at-rule layer functionality (@puckowski)
- [#4346](https://github.com/less/less.js/pull/4346) Fix [#4343](https://github.com/less/less.js/issues/4343) add color operands (@puckowski)
### v4.3.0 (2025-04-04)
- [#4319](https://github.com/less/less.js/pull/4319) Add deprecation warnings to Less output during parsing and new quiet flag (@matthew-dean)
- [#4320](https://github.com/less/less.js/pull/4320) Update README.md to remove Lerna reference (@matthew-dean)
- [#4322](https://github.com/less/less.js/pull/4322) Revise Playwright install method for CI stability (@puckowski)
- [#4333](https://github.com/less/less.js/pull/4333) Add support for ```starting-style``` at rule. (@puckowski)
### v4.2.2 (2025-01-04)
- [#4290](https://github.com/less/less.js/pull/4290) Fix [#4268](https://github.com/less/less.js/issues/4268) nested pseudo-selector parsing (@puckowski)
- [#4291](https://github.com/less/less.js/pull/4291) Enhance Less.js test environment setup (#4291) (@iChenLei)
- [#4295](https://github.com/less/less.js/pull/4295) Fix [#4252](https://github.com/less/less.js/issues/4252) container queries created via mixin evaluating variables incorrectly (@puckowski)
- [#4294](https://github.com/less/less.js/pull/4294) Fix [#3737](https://github.com/less/less.js/issues/3737) allow blank variable declarationd (@puckowski)
- [#4292](https://github.com/less/less.js/pull/4292) Fix [#4258](https://github.com/less/less.js/issues/4258) variable interpolation after math (@puckowski)
- [#4293](https://github.com/less/less.js/pull/4293) Fix [#4264](https://github.com/less/less.js/issues/4264) strip line comment from expression (@puckowski)
- [#4302](https://github.com/less/less.js/pull/4302) Fix [#4301](https://github.com/less/less.js/issues/4301) at-rule declarations missing (@puckowski)
- [#4309](https://github.com/less/less.js/pull/4309) Fix Node 23 CI (#4309) (@iChenLei)
### v4.2.1 (2024-09-26)
- [#4237](https://github.com/less/less.js/pull/4237) Fix [#4235](https://github.com/less/less.js/issues/4235) container style queries extra space resolved (@puckowski)
### v4.2.0 (2023-08-06)
- [#3811](https://github.com/less/less.js/pull/3811) add support for [container queries](https://www.w3.org/TR/css-contain-3) (@puckowski)
- [#3761](https://github.com/less/less.js/pull/3761) fix faulty source map generation with variables in selectors, fixes [#3567](https://github.com/less/less.js/issues/3567) (@pgoldberg)
- [#3700](https://github.com/less/less.js/pull/3700) parsing variables fail when there is no trailing semicolon (@b-kelly)
- [#3719](https://github.com/less/less.js/pull/3719) modify `this` pointer so that it is not empty. (@lumburr)
- [#3649](https://github.com/less/less.js/pull/3649) fixes [#2991](https://github.com/less/less.js/issues/2991) empty @media queries generated when compiling less file with (reference) to bootstrap (@MoonCoral)