1789817 - [wpt-sync] Sync PR 35829 - Support CSS Conditional 5 font feature detection extensions

Status: RESOLVED FIXED

(Testing :: web-platform-tests, task, P4)

Description

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

Sync web-platform-tests PR 35829 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/35829
Details from upstream follow.

Dominik Röttsches <[e-mail]> wrote:

Support CSS Conditional 5 font feature detection extensions

[1] defines two additional conditional functions font-tech() and
font-format() which were introduced after the resolution of TAG review
[2] and discussion in the CSS working group [3].

These functions allow conditional CSS to be included depending on level
of font support in the font stack of the UA. Feature detection becomes
particular important when checking for the level of color font support,
as UA capabilities still very and not all user agents provide support
for COLRv1 for example.

Implement behind SupportsFontFormatTech RuntimeEnabledFeatures flag
for now, pending I2S.

[1] https://www.w3.org/TR/css-conditional-5/#at-supports-ext
[2] https://github.com/w3ctag/design-reviews/issues/666
[3] https://github.com/w3c/csswg-drafts/issues/6520#issuecomment-947810568

Bug: 1255685
Change-Id: I96ab292bc9644b049a84e073b367063cdbedd26f

Reviewed-on: https://chromium-review.googlesource.com/3197710
WPT-Export-Revision: 9fd00b200383df7faf714b7143c4e50347e9e557

Comment 1

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

Pushed to try (stability) https://treeherder.mozilla.org/#/jobs?repo=try&revision=1812d08d2977636d7e845e2bf17e2d75dd0e954d

Comment 2

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

CI Results

Ran 10 Firefox configurations based on mozilla-central, and Firefox, Chrome, and Safari on GitHub CI

Total 2 tests

Status Summary

Firefox

OK : 1
PASS: 9[Gecko-android-em-7.0-x86_64-qr-debug-isolated-process-geckoview, GitHub] 10[Gecko-android-em-7.0-x86_64-lite-qr-opt-geckoview, Gecko-android-em-7.0-x86_64-qr-debug-geckoview, Gecko-android-em-7.0-x86_64-qr-opt-geckoview, Gecko-linux1804-64-qr-debug, Gecko-linux1804-64-qr-opt, Gecko-windows10-32-2004-qr-debug, Gecko-windows10-32-2004-qr-opt, Gecko-windows10-64-2004-qr-debug, Gecko-windows10-64-2004-qr-opt]

Chrome

OK : 1
PASS: 6
FAIL: 3

Safari

OK : 1
PASS: 6
FAIL: 3

Links

Gecko CI (Treeherder)
GitHub PR Head
GitHub PR Base

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/3b1571bca459
[wpt PR 35829] - Support CSS Conditional 5 font feature detection extensions, a=testonly

Comment 4

[Marian-Vasile Laza]

https://hg.mozilla.org/mozilla-central/rev/3b1571bca459