Bug 271136

Summary: [css-cascade] revert-layer does not rollback unregistered custom properties
Product: WebKit Reporter: Nathan Knowler <nathan>
Component: CSSAssignee: Nobody <webkit-unassigned>
Status: RESOLVED CONFIGURATION CHANGED    
Severity: Normal CC: ahmad.saleem792, koivisto, m_dubet, nathan, ntim, obrufau, webkit-bug-importer, zalan
Priority: P2 Keywords: BrowserCompat, HasReduction, InRadar
Version: Safari 17   
Hardware: All   
OS: All   
Attachments:
Description Flags
Test reduction for custom properties and revert-layer none

Nathan Knowler
Reported 2024-03-17 20:34:53 PDT
Created attachment 470414 [details] Test reduction for custom properties and revert-layer I expect that using the `revert-layer` keyword for a custom property would roll it back to the previous layer’s specified value, however, for unregistered custom properties it seems to ignore any specified values and computes as nothing. Registered custom properties seem to work as expected whether or not they have an initial value. Chrome and Firefox both work as expected.
Attachments
Test reduction for custom properties and revert-layer (1.93 KB, text/html)
2024-03-17 20:34 PDT, Nathan Knowler 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2024-03-24 20:35:45 PDT
<rdar://problem/125332655>
Ahmad Saleem
Comment 2 2024-04-02 05:47:54 PDT
It is reproducible in Safari Technology Preview 191, while Chrome Canary 125 and Firefox Nightly 126 match each other and do show 'Unregistered custom property' in 'DeepPink' like other while Safari show it in 'White'.
Ahmad Saleem
Comment 3 2025-07-02 13:11:46 PDT
Seems to work fine now on ToT (296922@main) - lists are now DeepPink. Might be combination of fixes by Antti today. https://commits.webkit.org/296909@main & https://github.com/WebKit/WebKit/commit/ca01e51f31208ce0654b7e67b01e4d64241fcff0
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