Bug 261708

Summary:	Mix-blend-mode incorrectly blends with view base color
Product:	WebKit	Reporter:	Matt Woodrow <mattwoodrow>
Component:	Layout and Rendering	Assignee:	Matt Woodrow <mattwoodrow>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	bfulgham, simon.fraser, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
See Also:	https://github.com/web-platform-tests/wpt/pull/42069
Bug Depends on:
Bug Blocks:	176830

Description Matt Woodrow 2023-09-18 16:29:01 PDT

Mix-blend-mode on an element that blends into the 'Root Element Group' should have only the root element's background color, or transparent if none. We're including the opaque white base color of the RenderView too, which is incorrect.

Comment 1 Radar WebKit Bug Importer 2023-09-18 16:30:04 PDT

<rdar://problem/115688282>

Comment 2 Matt Woodrow 2023-09-18 16:33:34 PDT

Pull request: https://github.com/WebKit/WebKit/pull/17884

Comment 3 Matt Woodrow 2023-09-19 16:41:58 PDT

Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/42069

Comment 4 EWS 2023-09-19 20:22:25 PDT

Committed 268173@main (4f26343f6d0b): <https://commits.webkit.org/268173@main>

Reviewed commits have been landed. Closing PR #17884 and removing active labels.