Issues

• Parser hangs after a previous parse due to stale token-buffer data

  csstree/csstree#388 · Filter by author gijo-varghese opened on Oct 20, 2026

• A nested style rule starting with a type selector and a pseudo-class is parsed as a declaration: .nav { a:hover { color: red } }

  csstree/csstree#381 · Filter by author gildas-lormeau opened on Sep 22, 2026

• url() decoding loses the value when it ends in an escaped whitespace: url(data:x\ ) gives " )"

  csstree/csstree#380 · Filter by author gildas-lormeau opened on Sep 22, 2026

• TokenStream.setSource() clears the whole balance buffer, so one large stylesheet makes every later parse in the process up to 255x slower

  csstree/csstree#379 · Filter by author gildas-lormeau opened on Sep 22, 2026

• createCustomError evaluates error.stack eagerly (lazy getter defeated by Object.assign)

  csstree/csstree#377 · Filter by author rafalh opened on Sep 21, 2026

• Token offsets overflow 24 bits: inputs larger than 16MB parse incorrectly or never finish

  csstree/csstree#372 · Filter by author gildas-lormeau opened on Aug 25, 2026

• Grammar syntax for defining excluded idents for <custom-ident> productions

  enhancementsyntax definition
  csstree/csstree#362 · Filter by author romainmenke opened on Mar 11, 2026
  1

• Value Definition Syntax parser fails on <@swash>

  enhancementsyntax definition
  csstree/csstree#361 · Filter by author tidoust opened on Mar 11, 2026
  1

• url() serialization is incorrect

  csstree/csstree#360 · Filter by author domenic opened on Mar 7, 2026
  1

• parse() with list: false throws if context is selectorList

  csstree/csstree#359 · Filter by author asamuzaK opened on Mar 7, 2026
  1

• Context specific types

  csstree/csstree#357 · Filter by author romainmenke opened on Mar 4, 2026
  2

• Add better support for Arbitrary Substitution Functions

  enhancementlexer
  csstree/csstree#353 · Filter by author romainmenke opened on Nov 27, 2025
  1

• Accept pure C-implemented WASM tokenizer?

  csstree/csstree#342 · Filter by author PupilTong opened on May 16, 2025
  4

• CSS Generation of SVG in URL field requires quotes

  more details needed
  csstree/csstree#340 · Filter by author kraftbj opened on May 12, 2025
  2

• Documentation for fork() custom syntax

  docs
  csstree/csstree#336 · Filter by author nzakas opened on Apr 9, 2025
  1

• Lexer errors on custom variables in values

  enhancementlexer
  csstree/csstree#317 · Filter by author nzakas opened on Jan 14, 2025
  5

• Calc multiplying and divide syntax confusion.

  enhancementlexer
  csstree/csstree#315 · Filter by author git-kamien opened on Dec 28, 2024
  2

• Cannot find module '../data/patch.json' from 'undefined'

  csstree/csstree#314 · Filter by author phungmanhquang opened on Dec 19, 2024
  10

• Expose required descriptor data for at-rules

  lexersyntax definition
  csstree/csstree#308 · Filter by author nzakas opened on Nov 20, 2024
  2

• Add support for <whole-value> syntax validation

  syntax definition
  csstree/csstree#300 · Filter by author romainmenke opened on Oct 31, 2024
  2

• Validaton CSS variables name

  enhancementlexer
  csstree/csstree#298 · Filter by author PavelFil opened on Oct 26, 2024

• Error [csstree-match] BREAK after 15000 iterations

  enhancementlexer
  csstree/csstree#294 · Filter by author PavelFil opened on Oct 20, 2024
  6

• Functional Notation Definitions

  syntax definition
  csstree/csstree#292 · Filter by author lahmatiy opened on Oct 16, 2024
  1

• Regression: Empty :not() does not throw

  parser
  csstree/csstree#283 · Filter by author asamuzaK opened on Sep 12, 2024
  3

• Maintenance status

  csstree/csstree#279 · Filter by author romainmenke opened on Aug 24, 2024
  5