Bug 250042

Summary:	[css-nesting] Implement nesting at-rules inside style rule
Product:	WebKit	Reporter:	Matthieu Dubet <m_dubet>
Component:	WebCore Misc.	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	graouts, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Matthieu Dubet 2023-01-03 13:07:43 PST

https://drafts.csswg.org/css-nesting/#conditionals

The specification allows nested group rules inside of style rules: any at-rule whose body contains style rules can be nested inside of a style rule as well.

We don't support the @scope at-rules feature yet, but we should implement nesting support for @media, @layer, @container and @supports.

Comment 1 Matthieu Dubet 2023-01-03 13:08:16 PST

rdar://103147312

Comment 2 Matthieu Dubet 2023-01-03 13:31:21 PST

Pull request: https://github.com/WebKit/WebKit/pull/8162

Comment 3 EWS 2023-01-06 14:14:31 PST

Committed 258560@main (fb1992149cc1): <https://commits.webkit.org/258560@main>

Reviewed commits have been landed. Closing PR #8162 and removing active labels.

Comment 4 Antoine Quint 2023-01-07 12:53:04 PST

I believe this made fast/css-generated-content/noscript-pseudo-anim-crash.html crash:

https://results.webkit.org/?suite=layout-tests&test=fast%2Fcss-generated-content%2Fnoscript-pseudo-anim-crash.html