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Support animation-timeline: view(), calc(sibling-index() * 20ms)

css4Relating to features introduced in CSS4Relating to features introduced in CSS4

enhancement

Status: Open.

Feature

#1635 In MyIntervals/PHP-CSS-Parser;

· felipemarcos opened on Sep 12, 2026

Harden our GitHub workflows

Status: Open.

Task

#1628 In MyIntervals/PHP-CSS-Parser;

· oliverklee opened on Sep 4, 2026

·  

9.5.0: New features, bug fixes and deprecations

Handle strings in at-rules that contain { or ;

bug

Status: Open.

Bug

#1625 In MyIntervals/PHP-CSS-Parser;

· JakeQZ opened on Aug 27, 2026

·  

9.5.0: New features, bug fixes and deprecations

Improve robustness and performance of regular expressions

bug

enhancement

optimization

Status: Open.

Task

#1614 In MyIntervals/PHP-CSS-Parser;

· JakeQZ opened on Aug 14, 2026

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10.0.0: Clean up things, rework the API

Drop support for PHP < 7.4

Status: Open.

Task

#1603 In MyIntervals/PHP-CSS-Parser;

· oliverklee opened on Jul 9, 2026

·  

10.0.0: Clean up things, rework the API

Introduce ObjectModel namespace for elements within CSSOM

refactorFor PRs that refactor code without changing functionalityFor PRs that refactor code without changing functionality

Status: Open.

Task

#1545 In MyIntervals/PHP-CSS-Parser;

· JakeQZ opened on Feb 23, 2026

·  

9.5.0: New features, bug fixes and deprecations

Drop the deprecated RuleContainer class

Status: Open.

Task

#1531 In MyIntervals/PHP-CSS-Parser;

· oliverklee opened on Feb 17, 2026

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10.0.0: Clean up things, rework the API

Drop the deprecated Rule\Rule class alias

Status: Open.

Task

#1509 In MyIntervals/PHP-CSS-Parser;

· oliverklee opened on Feb 12, 2026

·  

10.0.0: Clean up things, rework the API

Drop the deprecared Property\Declaration::get/setPropertyName()

Status: Open.

#1507 In MyIntervals/PHP-CSS-Parser;

· oliverklee opened on Feb 12, 2026

·  

10.0.0: Clean up things, rework the API

Drop the deprecated Selector::setSelector() and ::getSelector()

Status: Open.

Task

#1501 In MyIntervals/PHP-CSS-Parser;

· oliverklee opened on Feb 7, 2026

·  

10.0.0: Clean up things, rework the API

Check if getArrayRepresentation() in abstract classes can be removed or made abstract

Status: Open.

#1481 In MyIntervals/PHP-CSS-Parser;

· oliverklee opened on Jan 25, 2026

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9.5.0: New features, bug fixes and deprecations

Charset should not implement AtRule

Status: Open.

#1469 In MyIntervals/PHP-CSS-Parser;

· oliverklee opened on Jan 18, 2026

·  

10.0.0: Clean up things, rework the API