Bug 271136

Summary:

[css-cascade] revert-layer does not rollback unregistered custom properties

Product:

WebKit

Reporter:

Nathan Knowler <nathan>

Component:

CSS

Assignee:

Nobody <webkit-unassigned>

Status:

NEW ---

Severity:

Normal

CC:

ahmad.saleem792, koivisto, m_dubet, nathan, ntim, obrufau, webkit-bug-importer, zalan

Priority:

Keywords:

BrowserCompat, HasReduction, InRadar

Version:

Safari 17

Hardware:

All

OS:

All

Attachments:

Description	Flags
Test reduction for custom properties and revert-layer	none

Description Nathan Knowler 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.

Comment 1 Radar WebKit Bug Importer 2024-03-24 20:35:45 PDT

<rdar://problem/125332655>

Comment 2 Ahmad Saleem 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'.