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Style Engine: Preserve important state declarations - #12361

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ramonjd wants to merge 6 commits into
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ramonjd:backport/style-engine-preserve-important
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Style Engine: Preserve important state declarations#12361
ramonjd wants to merge 6 commits into
WordPress:trunkfrom
ramonjd:backport/style-engine-preserve-important

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@ramonjd

@ramonjd ramonjd commented Jun 30, 2026

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Important

This PR has a dependency on #11384

Backport of WordPress/gutenberg#79568

What

State styles currently append !important directly to CSS values before Style Engine sanitization. For gradient values, this can cause safecss_filter_attr() to reject otherwise valid declarations, so responsive/state gradient CSS may not be emitted.

How

Store !important as declaration metadata in the Style Engine, preserve it through rule generation and optimization, and append it only after sanitization.

Trac ticket: https://core.trac.wordpress.org/ticket/65561

Use of AI Tools

AI assistance: Yes
Tool(s): GitHub Copilot, ChatGPT
Model(s): GPT-5.5
Used for: Initial architectural discussion. Unit test scaffolding.

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Hi there! 👋

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Test using WordPress Playground

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Test this pull request with WordPress Playground.

@ramonjd ramonjd added the bug label Jun 30, 2026
@ramonjd
ramonjd force-pushed the backport/style-engine-preserve-important branch from 59e4d49 to 794f19d Compare June 30, 2026 03:57
Comment thread src/wp-includes/style-engine/class-wp-style-engine.php Outdated
Comment thread src/wp-includes/style-engine.php Outdated
Comment thread src/wp-includes/style-engine/class-wp-style-engine-css-rule.php Outdated
'style' => array(
'@tablet' => array(
'background' => array(
'backgroundImage' => 'linear-gradient(135deg,rgb(119,255,112) 0%,rgb(253,254,215) 99%)',

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That is not yet a faithful port of WordPress/gutenberg#79568.

I adapted the test temporarily because background.gradient style engine metadata is missing from Core.

See #11384

@t-hamano

t-hamano commented Jul 7, 2026

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I would appreciate it if you could proceed with this PR and commit it in time for the 7.1 Beta1 release on July 15.

@ramonjd

ramonjd commented Jul 14, 2026

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I'll rebase this after #11384 lands and it should be good to go

@ramonjd
ramonjd force-pushed the backport/style-engine-preserve-important branch from c934651 to 452e02a Compare July 14, 2026 03:00
@ramonjd ramonjd self-assigned this Jul 14, 2026
@ramonjd
ramonjd marked this pull request as ready for review July 14, 2026 03:06
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The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

Core Committers: Use this line as a base for the props when committing in SVN:

Props ramonopoly, wildworks.

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@andrewserong andrewserong left a comment

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The backport looks clean to me, and overall I like the inclusions, too:

  • Allowing the style engine to append !important via add_declaration feels tidier
  • The use of an options array opens up the possibility for other flags in the future
  • The change in states.php also makes things clearer IMO as there's a more explicit difference between the rules set to important, and those that are fallbacks

LGTM!

@ramonjd

ramonjd commented Jul 14, 2026

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Committed in hr62720 / dfff16f

@ramonjd ramonjd closed this Jul 14, 2026
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