Bug 310021

Summary:

REGRESSION (300173@main): Filter: invert() on child and parent doesn't cancel each other out

Product:

WebKit

Reporter:

Paul Rhomberg <paulrhomberg01>

Component:

Layout and Rendering

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED CONFIGURATION CHANGED

Severity:

Critical

CC:

ap, bfulgham, karlcow, mattwoodrow, sabouhallawa, simon.fraser, zalan

Priority:

Version:

Safari 26

Hardware:

All

OS:

All

See Also:

https://bugs.webkit.org/show_bug.cgi?id=299063
https://bugs.webkit.org/show_bug.cgi?id=302900

Attachments:

Description	Flags
Minimal example html	none
rendering in safari, firefox, chrome	none
Screenshot iOS 26.3.1	none

Paul Rhomberg

Reported 2026-03-16 07:30:41 PDT

Created attachment 478688 [details] Minimal example html When applying filter: invert() to both the child and parent, they no longer cancel each other out but appear as one invert. This works correctly in Chrome, Firefox, and pre-26 versions of Safari. Minimal example attached.

Attachments
Minimal example html (566 bytes, text/html) 2026-03-16 07:30 PDT, Paul Rhomberg	no flags	Details
rendering in safari, firefox, chrome (115.98 KB, image/png) 2026-03-16 08:44 PDT, Karl Dubost	no flags	Details
Screenshot iOS 26.3.1 (169.44 KB, image/png) 2026-03-16 08:57 PDT, Paul Rhomberg	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Karl Dubost

Comment 1 2026-03-16 08:44:38 PDT

Created attachment 478690 [details] rendering in safari, firefox, chrome This is what I get with Safari Technology Preview 239 21625.1.8.19.1 Firefox Nightly 150.0a1 15026.3.13 Google Chrome Canary 148.0.7734.0 7734.0

Paul Rhomberg

Comment 2 2026-03-16 08:54:50 PDT

Comment on attachment 478690 [details] rendering in safari, firefox, chrome Interesting. What Safari are you using? For me it's buggy on iOS 26.3.1 (shows white).

Paul Rhomberg

Comment 3 2026-03-16 08:57:35 PDT

Forget my question about the Safari version.. I've added an attachment of how it looks for me on iOS 26.3.1

Paul Rhomberg

Comment 4 2026-03-16 08:57:54 PDT

Created attachment 478693 [details] Screenshot iOS 26.3.1

Alexey Proskuryakov

Comment 5 2026-03-16 10:35:42 PDT

This regressed with 300173@main, and progressed with 304143@main, even though it wasn't explicitly fixing this issue. The test case renders correctly with Safari Technology Preview, as well as with built-in Safari in OS 26.4 betas.

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