2070531 - attr() and style queries don't work together

Status: RESOLVED FIXED

(Core :: CSS Parsing and Computation, defect, P3)

Description

[Jake Archibald [:jakea]]

https://random-stuff.jakearchibald.com/bug-repros/attr-in-style-queries/

The first box should be green.

Comment 1

[Emilio Cobos Álvarez [:emilio]]

I'm going to bet that's due to this.

Comment 2

[Emilio Cobos Álvarez [:emilio]]

Yeah mozregression --launch 2026-06-16 behaves as expected.

Comment 3

[Emilio Cobos Álvarez [:emilio]]

Attachment: Bug 2070531 - Only check attr taintedness for equality in the places we need to do so. r=#style

That is, in the places where we are deciding to potentially replace a
value with another (the property deduplication, and the fast path to
avoid the cascade).

Otherwise we'd fail /css/css-values/attr-universal-selector.html

Comment 4

[BugBot [:suhaib / :marco]]

Set release status flags based on info from the regressing bug 2047198

:sukil, since you are the author of the regressor, bug 2047198, could you take a look?

For more information, please visit BugBot documentation.

Comment 5

[Emilio Cobos Álvarez [:emilio]]

Too slow bugbot :)

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/e6fab792b2be
https://hg.mozilla.org/integration/autoland/rev/8838df6b561d
Only check attr taintedness for equality in the places we need to do so. r=firefox-style-system-reviewers,dshin

Comment 7

[Cristian Tuns]

https://hg.mozilla.org/mozilla-central/rev/8838df6b561d

Comment 8

[Jake Archibald [:jakea]]

This was spotted externally https://bsky.app/profile/alexlehner86.bsky.social/post/3mv3efru7rk26 so it might be worth an uplift.

But then, with "new attr" being so new, it could probably just ride the new faster trains.

Comment 9

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Created web-platform-tests PR https://github.com/web-platform-tests/wpt/pull/62590 for changes under testing/web-platform/tests

Comment 10

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Upstream PR merged by moz-wptsync-bot