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Merged
Loirooriol merged 1 commit into from
Jan 14, 2026

layout: Let floats know that margins can collapse thru phantom lines

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Merged

layout: Let floats know that margins can collapse thru phantom lines #57116

layout: Let floats know that margins can collapse thru phantom lines
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Community-TC Integration / wpt-firefox-nightly-stability succeeded Jan 14, 2026 in 17m 53s

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: 2026-01-14T00:20:07.171Z
Resolved: 2026-01-14T00:25:19.310Z
Task Execution Time: 5 minutes, 12 seconds, 139 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 2026-01-14 00:20:07.241Z] Task ID: RosIZ7j8TdaDL0tRNYXehg
[taskcluster 2026-01-14 00:20:07.241Z] Worker ID: 621252385201418277
[taskcluster 2026-01-14 00:20:07.241Z] Worker Group: us-central1-a
[taskcluster 2026-01-14 00:20:07.241Z] Worker Node Type: projects/757942385826/machineTypes/n2-standard-4
[taskcluster 2026-01-14 00:20:07.241Z] Worker Pool: proj-wpt/ci
[taskcluster 2026-01-14 00:20:07.241Z] Worker Version: 46.1.0
[taskcluster 2026-01-14 00:20:07.241Z] Public IP: 34.29.233.214
[taskcluster 2026-01-14 00:20:07.241Z] Hostname: proj-wpt-ci-aasenylosjwyg5rowznp7w

[taskcluster 2026-01-14 00:20:08.378Z] === 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

...(674 lines hidden)...

 1:48.08 certutil b'\nCertificate Nickname                                         Trust Attributes\n                                                             SSL,S/MIME,JAR/XPI\n\nweb-platform-tests                                           CT,, \n'
 1:48.09 INFO Application command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank -profile /tmp/tmptvx_4hpg
 1:48.10 INFO Starting runner
 1:48.10 pid:3379 Full command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank
pid:3379 [3379] Sandbox: CanCreateUserNamespace() clone() failure: EPERM
 1:48.88 pid:3379 1768350299849	Marionette	INFO	Marionette enabled
 1:49.04 pid:3379 1768350300008	Marionette	INFO	Listening on port 52381
 1:50.52 pid:3379 console.error: services.settings:
 1:50.52 pid:3379   Message: EmptyDatabaseError: "main/nimbus-desktop-experiments" has not been synced yet
 1:50.52 pid:3379   Stack:
 1:50.52 pid:3379     EmptyDatabaseError@resource://services-settings/Database.sys.mjs:19:5
 1:50.52 pid:3379 list@resource://services-settings/Database.sys.mjs:96:13
 1:50.76 pid:3379 console.warn: BackupService: "There was an error while trying to get the Document's directory" [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIProperties.get]"  nsresult: "0x80004005 (NS_ERROR_FAILURE)"  location: "JS frame :: resource:///modules/backup/BackupService.sys.mjs :: get docsDirFolderPath :: line 1245"  data: no]
 1:50.94 TEST_START: /css/CSS2/floats/float-after-block-with-collapsed-margin-inside-inline.html
 1:51.03 pid:3379 1768350301993	Marionette	INFO	Testing http://web-platform.test:8000/css/CSS2/floats/float-after-block-with-collapsed-margin-inside-inline.html == http://web-platform.test:8000/css/reference/ref-filled-green-200px-square.html
 1:51.29 pid:3379 1768350302253	Marionette	INFO	No differences allowed
 1:51.29 TEST_END: PASS
 1:51.29 TEST_START: /css/CSS2/floats/new-fc-separates-from-float-4.html
 1:51.29 pid:3379 1768350302259	Marionette	INFO	Testing http://web-platform.test:8000/css/CSS2/floats/new-fc-separates-from-float-4.html == http://web-platform.test:8000/css/reference/ref-filled-green-200px-square.html
 1:51.37 pid:3379 1768350302335	Marionette	INFO	No differences allowed
 1:51.37 TEST_END: PASS
 1:51.37 INFO No more tests
 1:51.42 pid:3379 1768350302386	Marionette	INFO	Stopped listening on port 52381
 1:52.18 INFO Browser exited with return code -15
 1:52.00 INFO Closing logging queue
 1:52.00 INFO queue closed
 1:52.19 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 14 checks (14 tests)
Expected results: 14
Unexpected results: 0
OK
 1:52.19 INFO Got 0 unexpected results, with 0 unexpected passes
 1:52.19 INFO Repetition 8 / 10
 1:52.19 SUITE_START: web-platform-test - running 2 tests
 1:52.19 INFO Using 1 child processes
 1:52.21 INFO Setting up ssl
 1:52.23 certutil b''
 1:52.26 certutil b''
 1:52.26 certutil b'\nCertificate Nickname                                         Trust Attributes\n                                                             SSL,S/MIME,JAR/XPI\n\nweb-platform-tests                                           CT,, \n'
 1:52.27 INFO Application command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank -profile /tmp/tmp8c3o6_xn
 1:52.28 INFO Starting runner
 1:52.28 pid:3707 Full command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank
pid:3707 [3707] Sandbox: CanCreateUserNamespace() clone() failure: EPERM
 1:53.04 pid:3707 1768350304007	Marionette	INFO	Marionette enabled
 1:53.20 pid:3707 1768350304163	Marionette	INFO	Listening on port 34715
 1:53.21 pid:3707 [Parent 3707, Main Thread] WARNING: Failed to create DBus proxy for org.a11y.Bus: Could not connect: Connection refused
 1:53.21 pid:3707 : 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:201
 1:53.21 pid:3707 ** (firefox-nightly:3707): WARNING **: 00:25:04.175: Failed to create DBus proxy for org.a11y.Bus: Could not connect: Connection refused
 1:54.66 pid:3707 console.error: services.settings:
 1:54.66 pid:3707   Message: EmptyDatabaseError: "main/nimbus-desktop-experiments" has not been synced yet
 1:54.66 pid:3707   Stack:
 1:54.66 pid:3707     EmptyDatabaseError@resource://services-settings/Database.sys.mjs:19:5
 1:54.66 pid:3707 list@resource://services-settings/Database.sys.mjs:96:13
 1:54.85 pid:3707 console.warn: BackupService: "There was an error while trying to get the Document's directory" [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIProperties.get]"  nsresult: "0x80004005 (NS_ERROR_FAILURE)"  location: "JS frame :: resource:///modules/backup/BackupService.sys.mjs :: get docsDirFolderPath :: line 1245"  data: no]
mem avail: 14074 of 15806 MiB (89.05%), swap free:    0 of    0 MiB ( 0.00%)
 1:55.01 TEST_START: /css/CSS2/floats/float-after-block-with-collapsed-margin-inside-inline.html
 1:55.10 pid:3707 1768350306065	Marionette	INFO	Testing http://web-platform.test:8000/css/CSS2/floats/float-after-block-with-collapsed-margin-inside-inline.html == http://web-platform.test:8000/css/reference/ref-filled-green-200px-square.html
 1:55.38 pid:3707 1768350306348	Marionette	INFO	No differences allowed
 1:55.38 TEST_END: PASS
 1:55.38 TEST_START: /css/CSS2/floats/new-fc-separates-from-float-4.html
 1:55.39 pid:3707 1768350306354	Marionette	INFO	Testing http://web-platform.test:8000/css/CSS2/floats/new-fc-separates-from-float-4.html == http://web-platform.test:8000/css/reference/ref-filled-green-200px-square.html
 1:55.47 pid:3707 1768350306431	Marionette	INFO	No differences allowed
 1:55.47 TEST_END: PASS
 1:55.47 INFO No more tests
 1:55.51 pid:3707 1768350306473	Marionette	INFO	Stopped listening on port 34715
 1:56.28 INFO Browser exited with return code -15
 1:56.09 INFO Closing logging queue
 1:56.09 INFO queue closed
 1:56.29 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 16 checks (16 tests)
Expected results: 16
Unexpected results: 0
OK
 1:56.29 INFO Got 0 unexpected results, with 0 unexpected passes
 1:56.29 INFO Repetition 9 / 10
 1:56.29 SUITE_START: web-platform-test - running 2 tests
 1:56.29 INFO Using 1 child processes
 1:56.31 INFO Setting up ssl
 1:56.33 certutil b''
 1:56.36 certutil b''
 1:56.37 certutil b'\nCertificate Nickname                                         Trust Attributes\n                                                             SSL,S/MIME,JAR/XPI\n\nweb-platform-tests                                           CT,, \n'
 1:56.37 INFO Application command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank -profile /tmp/tmpq5ni0yez
 1:56.39 INFO Starting runner
 1:56.39 pid:4029 Full command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank
pid:4029 [4029] Sandbox: CanCreateUserNamespace() clone() failure: EPERM
 1:57.17 pid:4029 1768350308142	Marionette	INFO	Marionette enabled
 1:57.34 pid:4029 1768350308302	Marionette	INFO	Listening on port 46913
 1:58.81 pid:4029 console.error: services.settings:
 1:58.81 pid:4029   Message: EmptyDatabaseError: "main/nimbus-desktop-experiments" has not been synced yet
 1:58.81 pid:4029   Stack:
 1:58.82 pid:4029     EmptyDatabaseError@resource://services-settings/Database.sys.mjs:19:5
 1:58.82 pid:4029 list@resource://services-settings/Database.sys.mjs:96:13
 1:59.05 pid:4029 console.warn: BackupService: "There was an error while trying to get the Document's directory" [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIProperties.get]"  nsresult: "0x80004005 (NS_ERROR_FAILURE)"  location: "JS frame :: resource:///modules/backup/BackupService.sys.mjs :: get docsDirFolderPath :: line 1245"  data: no]
 1:59.21 TEST_START: /css/CSS2/floats/float-after-block-with-collapsed-margin-inside-inline.html
 1:59.32 pid:4029 1768350310286	Marionette	INFO	Testing http://web-platform.test:8000/css/CSS2/floats/float-after-block-with-collapsed-margin-inside-inline.html == http://web-platform.test:8000/css/reference/ref-filled-green-200px-square.html
 1:59.57 pid:4029 1768350310533	Marionette	INFO	No differences allowed
 1:59.57 TEST_END: PASS
 1:59.57 TEST_START: /css/CSS2/floats/new-fc-separates-from-float-4.html
 1:59.57 pid:4029 1768350310537	Marionette	INFO	Testing http://web-platform.test:8000/css/CSS2/floats/new-fc-separates-from-float-4.html == http://web-platform.test:8000/css/reference/ref-filled-green-200px-square.html
 1:59.65 pid:4029 1768350310615	Marionette	INFO	No differences allowed
 1:59.65 TEST_END: PASS
 1:59.65 INFO No more tests
 1:59.69 pid:4029 1768350310660	Marionette	INFO	Stopped listening on port 46913
 2:00.47 INFO Browser exited with return code -15
 2:00.28 INFO Closing logging queue
 2:00.28 INFO queue closed
 2:00.48 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 18 checks (18 tests)
Expected results: 18
Unexpected results: 0
OK
 2:00.48 INFO Got 0 unexpected results, with 0 unexpected passes
 2:00.48 INFO Repetition 10 / 10
 2:00.48 SUITE_START: web-platform-test - running 2 tests
 2:00.48 INFO Using 1 child processes
 2:00.49 INFO Setting up ssl
 2:00.52 certutil b''
 2:00.55 certutil b''
 2:00.56 certutil b'\nCertificate Nickname                                         Trust Attributes\n                                                             SSL,S/MIME,JAR/XPI\n\nweb-platform-tests                                           CT,, \n'
 2:00.56 INFO Application command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank -profile /tmp/tmpockca5st
 2:00.57 INFO Starting runner
 2:00.58 pid:4353 Full command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank
pid:4353 [4353] Sandbox: CanCreateUserNamespace() clone() failure: EPERM
 2:01.26 pid:4353 1768350312227	Marionette	INFO	Marionette enabled
 2:01.42 pid:4353 1768350312382	Marionette	INFO	Listening on port 39653
 2:01.43 pid:4353 [Parent 4353, Main Thread] WARNING: Failed to create DBus proxy for org.a11y.Bus: Could not connect: Connection refused
 2:01.43 pid:4353 : 'glib warning', file /builds/worker/checkouts/gecko/toolkit/xre/nsSigHandlers.cpp:201
 2:01.43 pid:4353 ** (firefox-nightly:4353): WARNING **: 00:25:12.393: Failed to create DBus proxy for org.a11y.Bus: Could not connect: Connection refused
 2:02.89 pid:4353 console.error: services.settings:
 2:02.90 pid:4353   Message: EmptyDatabaseError: "main/nimbus-desktop-experiments" has not been synced yet
 2:02.90 pid:4353   Stack:
 2:02.90 pid:4353     EmptyDatabaseError@resource://services-settings/Database.sys.mjs:19:5
 2:02.90 pid:4353 list@resource://services-settings/Database.sys.mjs:96:13
 2:03.10 pid:4353 console.warn: BackupService: "There was an error while trying to get the Document's directory" [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIProperties.get]"  nsresult: "0x80004005 (NS_ERROR_FAILURE)"  location: "JS frame :: resource:///modules/backup/BackupService.sys.mjs :: get docsDirFolderPath :: line 1245"  data: no]
 2:03.29 TEST_START: /css/CSS2/floats/float-after-block-with-collapsed-margin-inside-inline.html
 2:03.38 pid:4353 1768350314349	Marionette	INFO	Testing http://web-platform.test:8000/css/CSS2/floats/float-after-block-with-collapsed-margin-inside-inline.html == http://web-platform.test:8000/css/reference/ref-filled-green-200px-square.html
 2:03.65 pid:4353 1768350314621	Marionette	INFO	No differences allowed
 2:03.66 TEST_END: PASS
 2:03.66 TEST_START: /css/CSS2/floats/new-fc-separates-from-float-4.html
 2:03.66 pid:4353 1768350314626	Marionette	INFO	Testing http://web-platform.test:8000/css/CSS2/floats/new-fc-separates-from-float-4.html == http://web-platform.test:8000/css/reference/ref-filled-green-200px-square.html
 2:03.72 pid:4353 1768350314688	Marionette	INFO	No differences allowed
 2:03.72 TEST_END: PASS
 2:03.72 INFO No more tests
 2:03.76 pid:4353 1768350314727	Marionette	INFO	Stopped listening on port 39653
 2:04.56 INFO Browser exited with return code -15
 2:04.36 INFO Closing logging queue
 2:04.36 INFO queue closed
 2:04.57 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 20 checks (20 tests)
Expected results: 20
Unexpected results: 0
OK
 2:04.58 INFO Got 0 unexpected results, with 0 unexpected passes
 2:04.58 wptserve INFO Stopped http server on 127.0.0.1:8000
 2:04.58 wptserve INFO Stopped http server on 127.0.0.1:8002
 2:04.58 wptserve INFO Stopped http server on 127.0.0.1:8003
 2:04.59 wptserve INFO Stopped http server on 127.0.0.1:8001
 2:04.60 wptserve INFO Stopped http server on 127.0.0.1:8446
 2:04.60 wptserve INFO Stopped http server on 127.0.0.1:8445
 2:04.60 wptserve INFO Stopped http server on 127.0.0.1:8443
 2:04.60 wptserve INFO Stopped http server on 127.0.0.1:8444
 2:04.60 wptserve INFO Stopped http server on 127.0.0.1:9000
 2:04.60 wptserve INFO Stopped WebTransport over HTTP/3 server on 127.0.0.1:11000
 2:04.78 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 2:04.78 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 2:04.89 INFO Removed font: Ahem.ttf
 2:04.93 INFO Closing logging queue
 2:04.93 INFO queue closed
 2:04.94 INFO ::: Ran 10 of expected 10 iterations.
 2:04.94 INFO ## All results ##

 2:04.94 INFO ### /css/CSS2/floats/float-after-block-with-collapsed-margin-inside-inline.html ###
 2:04.94 INFO | Subtest | Results | Messages |
 2:04.94 INFO |---------|---------|----------|
 2:04.94 INFO |         | PASS    |          |
 2:04.94 INFO 
 2:04.94 INFO ### /css/CSS2/floats/new-fc-separates-from-float-4.html ###
 2:04.94 INFO | Subtest | Results | Messages |
 2:04.94 INFO |---------|---------|----------|
 2:04.94 INFO |         | PASS    |          |
 2:04.94 INFO 
 2:04.94 INFO ::: Running tests in a loop with restarts 10 times : PASS
 2:04.94 INFO :::
 2:04.94 INFO ::: Test verification PASS
 2:04.94 INFO :::
[taskcluster 2026-01-14 00:25:17.567Z] === Task Finished ===
[taskcluster 2026-01-14 00:25:18.016Z] Successful task run with exit code: 0 completed in 310.776 seconds
View more details on Community-TC Integration