Bug 241847 – [css-conditional] @supports selector fails for ::placeholder & ::file-selector-button

• Status: RESOLVED
• Resolution: FIXED
• Component: CSS

[Jan Nicklas]

Created attachment 460411 [details]
Reproduction Example

The `@supports selector ()` fails for shadow DOM pseudo element tests.

An example for supported shadow DOM pseudo element styling is `input::placeholder { color: orchid }`.

Therefore the expected behaviour would be that `@supports selector(input::placeholder) {` matches.
Furthermore the expected behaviour would also be that `@supports not selector(input::placeholder) {` does NOT match.

Instead the current behaviour is that `@supports selector(input::placeholder) {` does NOT match.
In addition the current behaviour is also that `@supports not selector(input::placeholder) {` does match.

This behaviour can be reproduced on different Safari versions:

- iOS 15.5 Safari
- MacOS Safari Version 15.5 (17613.2.7.1.8) 
- MacOS Safari Technology Preview Release 146 (Safari 15.4, WebKit 17614.1.14.10.6)

Current Firefox and Chrome versions behave correctly.

Please see the attached reproduction example.

[Radar WebKit Bug Importer]

<rdar://problem/95683424>

[Ryosuke Niwa]

Oh, this is nothing to do with Shadow DOM.

[Tim Nguyen (:ntim)]

WPT PR is at: https://github.com/web-platform-tests/wpt/pull/36410

[Tim Nguyen (:ntim)]

*** Bug 254682 has been marked as a duplicate of this bug. ***

[Tim Nguyen (:ntim)]

Joonghun, any update on this?

[Joonghun Park]

(In reply to Tim Nguyen (:ntim) from comment #5)
> Joonghun, any update on this?

I'm sorry for the delay. I made a patch and uploaded it to https://github.com/WebKit/WebKit/pull/13879. Please refer to it.

[EWS]

Committed 264090@main (61a3212d56ea): <https://commits.webkit.org/264090@main>

Reviewed commits have been landed. Closing PR #13879 and removing active labels.