Add a test for container-query parent and slotted child host styles #56899
Community-TC Integration / wpt-firefox-nightly-stability
succeeded
Dec 22, 2025 in 5m 3s
Community-TC (pull_request)
Verify that all tests affected by a pull request are stable when executed in firefox.
Details
View task in Taskcluster | View logs in Taskcluster | View task group in Taskcluster
Task Status
Started: 2025-12-22T19:29:46.447Z
Resolved: 2025-12-22T19:32:24.976Z
Task Execution Time: 2 minutes, 38 seconds, 529 milliseconds
Task Status: completed
Reason Resolved: completed
RunId: 0
Artifacts
- public/logs/live_backing.log
- public/logs/live.log
- public/results/checkrun.md
WPT Command: python3 ./wpt run --channel=nightly --verify --verify-no-chaos-mode --verify-repeat-loop=0 --verify-repeat-restart=10 --github-checks-text-file=/home/test/artifacts/checkrun.md --affected base_head --log-mach-level=info --log-mach=- -y --no-pause --no-restart-on-unexpected --install-fonts --verify-log-full --no-headless --binary=/home/test/build/firefox/firefox firefox
[taskcluster 2025-12-22 19:29:46.542Z] Task ID: BrSZjMF7RhGkwh0BvLCg9Q
[taskcluster 2025-12-22 19:29:46.542Z] Worker ID: 1108228863988869149
[taskcluster 2025-12-22 19:29:46.542Z] Worker Group: us-east4-a
[taskcluster 2025-12-22 19:29:46.542Z] Worker Node Type: projects/757942385826/machineTypes/n2-standard-4
[taskcluster 2025-12-22 19:29:46.542Z] Worker Pool: proj-wpt/ci
[taskcluster 2025-12-22 19:29:46.542Z] Worker Version: 46.1.0
[taskcluster 2025-12-22 19:29:46.542Z] Public IP: 34.150.177.79
[taskcluster 2025-12-22 19:29:46.542Z] Hostname: proj-wpt-ci-syn3b-5fs3-typcy0jj6-w
[taskcluster 2025-12-22 19:29:47.484Z] === Task Starting ===
+ '[' '' ']'
+ '[' -d /etc/profile.d ']'
+ for i in /etc/profile.d/*.sh
+ '[' -r /etc/profile.d/01-locale-fix.sh ']'
+ . /etc/profile.d/01-locale-fix.sh
+++ /usr/bin/locale-check C.UTF-8
++ eval
+ for i in /etc/profile.d/*.sh
+ '[' -r /etc/profile.d/apps-bin-path.sh ']'
+ . /etc/profile.d/apps-bin-path.sh
...(1369 lines hidden)...
1:34.07 TEST_END: Test OK. Subtests passed 22/22. Unexpected 0
1:34.07 TEST_START: /css/css-conditional/container-queries/style-container-for-shadow-dom.html
1:34.07 INFO Closing window 6e9ca772-e591-4aac-9236-91bb86d3ac6f
1:34.21 TEST_END: ERROR, expected OK
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
1:34.21 INFO No more tests
1:34.22 pid:4887 1766431942027 Marionette INFO Stopped listening on port 38349
1:34.86 INFO Browser exited with return code -15
1:34.75 INFO Closing logging queue
1:34.75 INFO queue closed
1:34.86 SUITE_END
web-platform-test
~~~~~~~~~~~~~~~~~
Ran 240 checks (220 subtests, 20 tests)
Expected results: 230
Unexpected results: 10
test: 10 (10 error)
Unexpected Results
------------------
/css/css-conditional/container-queries/style-container-for-shadow-dom.html
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
ERROR /css/css-conditional/container-queries/style-container-for-shadow-dom.html - Error: assert_implements: Basic support for style container queries required undefined
assert_implements_style_container_queries@http://web-platform.test:8000/css/css-conditional/container-queries/support/cq-testcommon.js:21:20
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:216:5
Tests.prototype.setup@http://web-platform.test:8000/resources/testharness.js:3773:17
setup@http://web-platform.test:8000/resources/testharness.js:1126:15
@http://web-platform.test:8000/css/css-conditional/container-queries/style-container-for-shadow-dom.html:215:8
1:34.86 INFO Got 10 unexpected results, with 0 unexpected passes
1:34.86 wptserve INFO Stopped http server on 127.0.0.1:8000
1:34.86 wptserve INFO Stopped http server on 127.0.0.1:8001
1:34.86 wptserve INFO Stopped http server on 127.0.0.1:8002
1:34.88 wptserve INFO Stopped http server on 127.0.0.1:8444
1:34.89 wptserve INFO Stopped http server on 127.0.0.1:8445
1:34.89 wptserve INFO Stopped http server on 127.0.0.1:8443
1:34.89 wptserve INFO Stopped http server on 127.0.0.1:8003
1:34.89 wptserve INFO Stopped http server on 127.0.0.1:8446
1:34.89 wptserve INFO Stopped http server on 127.0.0.1:9000
1:34.89 wptserve INFO Stopped WebTransport over HTTP/3 server on 127.0.0.1:11000
1:34.97 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
1:34.97 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
1:35.00 INFO Removed font: Ahem.ttf
1:35.03 INFO Closing logging queue
1:35.03 INFO queue closed
1:35.04 INFO ::: Ran 10 of expected 10 iterations.
1:35.04 INFO ## All results ##
1:35.04 INFO ### /css/css-conditional/container-queries/container-for-shadow-dom.html ###
1:35.04 INFO | Subtest | Results | Messages |
1:35.04 INFO |----------------------------------------------------------------------------------------------------------------------------|---------|----------|
1:35.04 INFO | | OK | |
1:35.04 INFO | `Match container in outer tree` | PASS | |
1:35.04 INFO | `Match container in walking flat tree ancestors` | PASS | |
1:35.04 INFO | `Match container in ::slotted selector's originating element tree` | PASS | |
1:35.04 INFO | `Match container in outer tree for :host` | PASS | |
1:35.04 INFO | `Match container in ::part selector's originating element tree` | PASS | |
1:35.04 INFO | `Match container for ::before in ::slotted selector's originating element tree` | PASS | |
1:35.04 INFO | `Match container in outer tree for :host::before` | PASS | |
1:35.04 INFO | `Match container for ::before in ::part selector's originating element tree` | PASS | |
1:35.04 INFO | `Match container for ::part selector's originating element tree for exportparts` | PASS | |
1:35.04 INFO | `Match container for slot light tree child fallback` | PASS | |
1:35.04 INFO | `Should match container inside shadow tree for ::part()` | PASS | |
1:35.04 INFO | `A :host::part rule should match containers in the originating element tree` | PASS | |
1:35.04 INFO | `Container name set inside a shadow tree should match query using ::part on the outside` | PASS | |
1:35.04 INFO | `Container name set with a ::part should match query inside the shadow tree` | PASS | |
1:35.04 INFO | `Container name set inside a shadow tree should match query for a ::slotted() rule inside the tree` | PASS | |
1:35.04 INFO | `Container name set inside a shadow tree should match query for host child on the outside` | PASS | |
1:35.04 INFO | `Container name set on :host from inside a shadow tree matching query inside the shadow tree` | PASS | |
1:35.04 INFO | `Container name set on :host from inside a shadow tree matching query for ::slotted inside the shadow tree` | PASS | |
1:35.04 INFO | `Container name set on :host from inside a shadow tree should match query for slotted from the outside of the shadow tree` | PASS | |
1:35.04 INFO | `The originating element should be the first container candidate of ::before` | PASS | |
1:35.04 INFO | `Search flat tree anchestors of the originating element of ::before` | PASS | |
1:35.04 INFO | `Parent container name and style on :host, with query set on slotted child's :host` | PASS | |
1:35.04 INFO
1:35.04 INFO ### /css/css-conditional/container-queries/style-container-for-shadow-dom.html ###
1:35.04 INFO | Subtest | Results | Messages |
1:35.04 INFO |---------|---------|----------|
1:35.04 INFO | | ERROR | |
1:35.04 INFO
1:35.04 INFO ::: Running tests in a loop with restarts 10 times : PASS
1:35.04 INFO :::
1:35.04 INFO ::: Test verification PASS
1:35.04 INFO :::
[taskcluster 2025-12-22 19:32:23.845Z] === Task Finished ===
[taskcluster 2025-12-22 19:32:24.216Z] Successful task run with exit code: 0 completed in 157.675 seconds
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