Bug 252536

Summary:	REGRESSION(257538@main): CSS opacity doesn't work on dialog::backdrop
Product:	WebKit	Reporter:	Martin <martiminchev>
Component:	Layout and Rendering	Assignee:	Tim Nguyen (:ntim) <ntim>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	bfulgham, martiminchev, ntim, simon.fraser, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	iPhone / iPad
OS:	iOS 16
See Also:	https://github.com/web-platform-tests/wpt/pull/38587

Description Martin 2023-02-18 12:08:33 PST

Since iOS 16.4 Beta 1, using the `opacity` CSS attribute together with a `background` on `dialog::backdrop` no longer works. Instead, there is always no transparency.

See this demo: https://jsfiddle.net/marto55555/yktr52hw/

Expected behavior: When the dialog is open, the button in the background should be slightly visible.

Comment 1 Radar WebKit Bug Importer 2023-02-18 15:31:50 PST

<rdar://problem/105636947>

Comment 2 Tim Nguyen (:ntim) 2023-02-19 13:58:49 PST

Pull request: https://github.com/WebKit/WebKit/pull/10352

Comment 3 Tim Nguyen (:ntim) 2023-02-19 14:01:00 PST

Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/38587

Comment 4 EWS 2023-02-20 12:31:49 PST

Committed 260556@main (903fc90f8a6a): <https://commits.webkit.org/260556@main>

Reviewed commits have been landed. Closing PR #10352 and removing active labels.