Issues

• ::placeholder gets incorrectly turned into :placeholder-shown

  parcel-bundler/lightningcss#1351 · Filter by author draganczukp opened on Sep 24, 2026

• Misleading warning: "'empty' not recognized as a valid pseudo-class" on ::part(foo):not(:empty)

  parcel-bundler/lightningcss#1348 · Filter by author johannespfrang-h-d opened on Sep 21, 2026

• Option to allowlist custom (non-standard) pseudo-classes/elements to suppress "not recognized" warnings

  parcel-bundler/lightningcss#1346 · Filter by author marekdedic opened on Sep 18, 2026

• transform() merges an unrelated rule's selector into another rule via an incorrect :is(...) descendant combinator

  parcel-bundler/lightningcss#1345 · Filter by author philipugurgel-lgtm opened on Sep 16, 2026

• Merges animation-timeline for scroll driven animations into invalid shorthand

  parcel-bundler/lightningcss#1342 · Filter by author eighty4 opened on Sep 8, 2026

• Compatibility with 32-bit system

  parcel-bundler/lightningcss#1331 · Filter by author ParsaXpython opened on Sep 7, 2026

• backdrop-filter is dropped when it precedes a hand-written -webkit-backdrop-filter

  parcel-bundler/lightningcss#1327 · Filter by author JDeffner opened on Sep 5, 2026

• engines.node says >= 12.0.0 but node/index.js uses ??= (Node 15) — main entry is a SyntaxError on 12/13/14

  parcel-bundler/lightningcss#1326 · Filter by author martin-k-m opened on Sep 4, 2026

• [bug] Syntax error for container query var evaluation

  parcel-bundler/lightningcss#1325 · Filter by author jackholden opened on Sep 3, 2026
  1

• Minifier wraps a selector list in :is() when a target lacks :has(), which changes the specificity of every other selector in the list

  parcel-bundler/lightningcss#1324 · Filter by author berkantdev opened on Sep 2, 2026

• CLI panics on Browserslist Baseline queries

  parcel-bundler/lightningcss#1320 · Filter by author tinovyatkin opened on Sep 1, 2026

• Two-value overflow shorthand is emitted for targets that don't support it

  parcel-bundler/lightningcss#1319 · Filter by author marekdedic opened on Sep 1, 2026

• Selector silently dropped from a nested selector list when an earlier rule shares a prefix

  parcel-bundler/lightningcss#1318 · Filter by author danielbaars opened on Sep 1, 2026

• Percentage math functions panic in percentage-typed contexts

  parcel-bundler/lightningcss#1312 · Filter by author ubugeeei opened on Aug 21, 2026

• Minifier silently drops a rule when a selector list is split and another selector in that list duplicates an earlier rule

  parcel-bundler/lightningcss#1310 · Filter by author danielbaars opened on Aug 18, 2026

• [bug] v1.33.0 rejects valid ::search-text:current and ::search-text:not(:current) selectors

  parcel-bundler/lightningcss#1303 · Filter by author rvitaliy opened on Aug 5, 2026

• [Bug] 'highlight' is not recognized as a valid pseudo-element, even though it is present in src/selector

  parcel-bundler/lightningcss#1300 · Filter by author ayrtonandino opened on Jul 31, 2026

• Gamut mapping returns at the first under-JND chroma, producing desaturated sRGB fallbacks

  parcel-bundler/lightningcss#1298 · Filter by author hey-jj opened on Jul 29, 2026

• Unbounded recursion in selector, math-function and rule-nesting parsing overflows the stack

  parcel-bundler/lightningcss#1297 · Filter by author hey-jj opened on Jul 29, 2026

• Consider adding an explicit copyright notice to the LICENSE file

  parcel-bundler/lightningcss#1296 · Filter by author MarkAshraf96 opened on Jul 28, 2026

• Chaining a pseudo-class after the '::picker' pseudo-element is not allowed.

  Bug

  parcel-bundler/lightningcss#1292 · Filter by author FlorianBoe opened on Jul 1, 2026
  4

• Unexpected behavior when transforming display: flex with vendor prefixes

  pending triage
  parcel-bundler/lightningcss#1291 · Filter by author bregenspan opened on Jun 29, 2026
  1

• Unexpected transformation of x units in image-set()

  Bug

  parcel-bundler/lightningcss#1286 · Filter by author denisryba opened on Jun 24, 2026

• Error: [lightningcss minify] Cannot find module '../lightningcss.openharmony-arm64.node'

  pending triage
  parcel-bundler/lightningcss#1285 · Filter by author SimboDu123 opened on Jun 24, 2026

• animation-timeline: view() added to animation shorthand

  Bug

  parcel-bundler/lightningcss#1283 · Filter by author Th3S4mur41 opened on Jun 23, 2026
  8