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selectedcontent element mutation record test is wrong #55849

selectedcontent element mutation record test is wrong
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Community-TC Integration / wpt-firefox-nightly-results-without-changes succeeded Jan 14, 2026 in 5m 0s

Community-TC (pull_request)

Collect results for all tests affected by a pull request in firefox but without the changes in the PR.

Details

View task in Taskcluster | View logs in Taskcluster | View task group in Taskcluster

Task Status

Started: 2026-01-14T17:50:25.252Z
Resolved: 2026-01-14T17:52:16.531Z
Task Execution Time: 1 minute, 51 seconds, 279 milliseconds
Task Status: completed
Reason Resolved: completed
RunId: 0

Artifacts

- public/logs/live_backing.log
- public/logs/live.log
- public/results/checkrun.md
- public/results/wpt_report.json.gz
- public/results/wpt_screenshot.txt.gz

WPT Command: python3 ./wpt run --channel=nightly --no-fail-on-unexpected --log-wptreport=../artifacts/wpt_report.json --log-wptscreenshot=../artifacts/wpt_screenshot.txt --affected task_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 17:50:25.325Z] Task ID: LGKdaPTvQiK5ibC7D-MiLQ
[taskcluster 2026-01-14 17:50:25.325Z] Worker ID: 5043553538698539823
[taskcluster 2026-01-14 17:50:25.325Z] Worker Group: us-east4-a
[taskcluster 2026-01-14 17:50:25.325Z] Worker Node Type: projects/757942385826/machineTypes/n2-standard-4
[taskcluster 2026-01-14 17:50:25.325Z] Worker Pool: proj-wpt/ci
[taskcluster 2026-01-14 17:50:25.325Z] Worker Version: 46.1.0
[taskcluster 2026-01-14 17:50:25.325Z] Public IP: 136.107.8.137
[taskcluster 2026-01-14 17:50:25.325Z] Hostname: proj-wpt-ci-qbt3je3bqeoe6tnv2b9gva

[taskcluster 2026-01-14 17:50:25.995Z] === 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

...(332 lines hidden)...

Failed to read: session.screen0.toolbar.maxOver
Setting default value
Failed to read: session.screen0.toolbar.visible
Setting default value
Failed to read: session.screen0.toolbar.alpha
Setting default value
Failed to read: session.screen0.toolbar.layer
Setting default value
Failed to read: session.screen0.toolbar.onhead
Setting default value
Failed to read: session.screen0.toolbar.placement
Setting default value
Failed to read: session.screen0.toolbar.height
Setting default value
Failed to read: session.screen0.iconbar.mode
Setting default value
Failed to read: session.screen0.iconbar.alignment
Setting default value
Failed to read: session.screen0.iconbar.iconWidth
Setting default value
Failed to read: session.screen0.iconbar.iconTextPadding
Setting default value
Failed to read: session.screen0.iconbar.usePixmap
Setting default value
 0:00.00 INFO Set tests_root to /home/test/web-platform-tests
 0:00.00 INFO Set metadata_root to /home/test/web-platform-tests
 0:00.00 INFO Set manifest_update to True
 0:00.00 INFO Set manifest_download to True
 0:09.62 INFO Identified 1 affected tests
 0:09.62 INFO Using certutil /usr/bin/certutil
 0:09.62 INFO Downloading geckodriver
 0:09.62 INFO Attempting to install webdriver from nightly
 0:10.09 INFO Extracted geckodriver to /home/test/web-platform-tests/_venv3/bin/geckodriver
 0:10.09 INFO Installed b'geckodriver 0.36.0 (9de1f024998b 2026-01-13 19:55 +0200)'
 0:14.23 INFO Getting profile data from git ref 8e6b6cb1dd0fdd9838e2359219e2b8d3b84490b2
 0:14.45 INFO Test prefs downloaded to /home/test/web-platform-tests/_venv3/profiles/8e6b6cb1dd0fdd9838e2359219e2b8d3b84490b2/149.0a1
[1321] Sandbox: CanCreateUserNamespace() clone() failure: EPERM
 0:14.58 mozversion INFO application_buildid: 20260114092633
 0:14.58 mozversion INFO application_changeset: 39b21669cfe3cada4af31d53458e530dcd059d28
 0:14.58 mozversion INFO application_display_name: Firefox Nightly
 0:14.58 mozversion INFO application_id: {ec8030f7-c20a-464f-9b0e-13a3a9e97384}
 0:14.58 mozversion INFO application_name: Firefox
 0:14.58 mozversion INFO application_remotingname: firefox-nightly
 0:14.58 mozversion INFO application_repository: https://hg.mozilla.org/mozilla-central
 0:14.58 mozversion INFO application_vendor: Mozilla
 0:14.58 mozversion INFO application_version: 149.0a1
 0:14.58 mozversion INFO platform_buildid: 20260114092633
 0:14.58 mozversion INFO platform_changeset: 39b21669cfe3cada4af31d53458e530dcd059d28
 0:14.58 mozversion INFO platform_repository: https://hg.mozilla.org/mozilla-central
 0:14.58 mozversion INFO platform_version: 149.0a1
 0:20.83 INFO Installed font: Ahem.ttf
 0:21.89 wptserve INFO Starting http server on http://127.0.0.1:8000
 0:21.91 wptserve INFO Starting http server on http://127.0.0.1:8002
 0:21.94 wptserve INFO Starting http server on http://127.0.0.1:8003
 0:21.95 wptserve INFO Starting https server on https://127.0.0.1:8445
 0:21.96 wptserve INFO Starting https server on https://127.0.0.1:8446
 0:21.98 wptserve INFO Starting http server on http://127.0.0.1:8001
 0:22.00 wptserve INFO Starting https server on https://127.0.0.1:8444
 0:22.00 wptserve INFO Starting https server on https://127.0.0.1:8443
 0:22.02 wptserve INFO Create socket on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:22.02 wptserve INFO Create socket on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:22.03 wptserve INFO Bind on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:22.03 wptserve INFO Listen on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:22.03 wptserve INFO Bind on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:22.03 wptserve INFO Listen on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:22.04 wptserve INFO Starting http2 server on https://127.0.0.1:9000
 0:22.16 wptserve INFO Starting WebTransport over HTTP/3 server on 127.0.0.1:11000
 0:22.37 SUITE_START: web-platform-test - running 1 tests
 0:31.28 INFO Using 1 child processes
 0:31.30 INFO Setting up ssl
 0:31.32 certutil Full command: /usr/bin/certutil -N -d /tmp/tmpqzi2ggow.mozrunner -f /tmp/tmpqzi2ggow.mozrunner/.crtdbpw
certutil b''
 0:31.34 certutil b''
 0:31.34 certutil b'\nCertificate Nickname                                         Trust Attributes\n                                                             SSL,S/MIME,JAR/XPI\n\nweb-platform-tests                                           CT,, \n'
 0:31.35 INFO Application command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank -profile /tmp/tmploclj4l_
 0:31.36 INFO Starting runner
 0:31.36 pid:1425 Full command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank
pid:1425 [1425] Sandbox: CanCreateUserNamespace() clone() failure: EPERM
 0:32.07 pid:1425 1768413126488	Marionette	INFO	Marionette enabled
 0:32.17 pid:1425 1768413126596	Marionette	INFO	Listening on port 50195
Failed to read: session.screen0.titlebar.left
Setting default value
Failed to read: session.screen0.titlebar.right
Setting default value
 0:35.10 pid:1425 console.error: services.settings:
 0:35.10 pid:1425   Message: EmptyDatabaseError: "main/nimbus-desktop-experiments" has not been synced yet
 0:35.10 pid:1425   Stack:
 0:35.10 pid:1425     EmptyDatabaseError@resource://services-settings/Database.sys.mjs:19:5
 0:35.10 pid:1425 list@resource://services-settings/Database.sys.mjs:96:13
 0:35.28 pid:1425 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]
 0:35.52 TEST_START: /html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html
 0:36.24 TEST_END: Test OK. Subtests passed 0/7. Unexpected 7
FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test1 - assert_equals: test1 expected "<select>\n    <button>\n      <selectedcontent><span>span</span> three</selectedcontent>\n    </button>\n    <option><span>span</span> one</option>\n    <option><span>span</span> two</option>\n    <option selected=\"\"><span>span</span> three</option>\n  </select>" but got "<select>\n    \n      \n    \n    <option>span one</option>\n    <option>span two</option>\n    <option selected=\"\">span three</option>\n  </select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7
FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test2 - assert_equals: test2 expected "<select>\n    <selectedcontent>option</selectedcontent>\n    <option>option</option>\n  </select>" but got "<select>\n    \n    <option>option</option>\n  </select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7
FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test3 - assert_equals: test3 expected "<select>\n    <button>\n      <selectedcontent>option</selectedcontent>\n      <selectedcontent>outer2\n        <selectedcontent>inner2</selectedcontent>\n      </selectedcontent>\n    </button>\n    <option>option</option>\n  </select>" but got "<select>\n    \n      outer1\n        inner1\n      \n      outer2\n        inner2\n      \n    \n    <option>option</option>\n  </select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7
FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test4 - assert_equals: test4 expected "<select>\n    <button>\n      <selectedcontent>two</selectedcontent>\n    </button>\n    <div>\n      <option>one</option>\n    </div>\n    <div>\n      <option selected=\"\">two</option>\n    </div>\n  </select>" but got "<select>\n    \n      \n    \n    \n      <option>one</option>\n    \n    \n      <option selected=\"\">two</option>\n    \n  </select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7
FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test5 - assert_equals: test5 expected "<select>\n    <option>option</option>\n    <button>\n      <selectedcontent>option</selectedcontent>\n    </button>\n  </select>" but got "<select>\n    <option>option</option>\n    \n      \n    \n  </select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7
FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test6 - assert_equals: test6 expected "<select multiple=\"\" size=\"1\">\n    <button>\n      <selectedcontent>\n        <selectedcontent></selectedcontent>\n      </selectedcontent>\n      <selectedcontent>\n        <selectedcontent></selectedcontent>\n      </selectedcontent>\n    </button>\n    <option>option</option>\n  </select>" but got "<select multiple=\"\" size=\"1\">\n    \n      \n        \n      \n      \n        \n      \n    \n    <option>option</option>\n  </select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7
FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test7 - assert_equals: test7 expected "<select>\n    <button>\n      <selectedcontent>one</selectedcontent>\n    </button>\n    <option>one</option>\n    <div></div>\n  <option selected=\"\">two</option><option selected=\"\">three</option></select>" but got "<select>\n    \n      \n    \n    <option>one</option>\n    \n  <option selected=\"\">two</option><option selected=\"\">three</option></select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7

 0:36.24 INFO No more tests
 0:36.25 pid:1425 1768413130666	Marionette	INFO	Stopped listening on port 50195
 0:37.05 INFO Browser exited with return code -15
 0:36.93 INFO Closing logging queue
 0:36.93 INFO queue closed
 0:37.06 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 8 checks (7 subtests, 1 tests)
Expected results: 1
Unexpected results: 7
  subtest: 7 (7 fail)

Unexpected Results
------------------
/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html
  FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test1 - assert_equals: test1 expected "<select>\n    <button>\n      <selectedcontent><span>span</span> three</selectedcontent>\n    </button>\n    <option><span>span</span> one</option>\n    <option><span>span</span> two</option>\n    <option selected=\"\"><span>span</span> three</option>\n  </select>" but got "<select>\n    \n      \n    \n    <option>span one</option>\n    <option>span two</option>\n    <option selected=\"\">span three</option>\n  </select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7
  FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test2 - assert_equals: test2 expected "<select>\n    <selectedcontent>option</selectedcontent>\n    <option>option</option>\n  </select>" but got "<select>\n    \n    <option>option</option>\n  </select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7
  FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test3 - assert_equals: test3 expected "<select>\n    <button>\n      <selectedcontent>option</selectedcontent>\n      <selectedcontent>outer2\n        <selectedcontent>inner2</selectedcontent>\n      </selectedcontent>\n    </button>\n    <option>option</option>\n  </select>" but got "<select>\n    \n      outer1\n        inner1\n      \n      outer2\n        inner2\n      \n    \n    <option>option</option>\n  </select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7
  FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test4 - assert_equals: test4 expected "<select>\n    <button>\n      <selectedcontent>two</selectedcontent>\n    </button>\n    <div>\n      <option>one</option>\n    </div>\n    <div>\n      <option selected=\"\">two</option>\n    </div>\n  </select>" but got "<select>\n    \n      \n    \n    \n      <option>one</option>\n    \n    \n      <option selected=\"\">two</option>\n    \n  </select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7
  FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test5 - assert_equals: test5 expected "<select>\n    <option>option</option>\n    <button>\n      <selectedcontent>option</selectedcontent>\n    </button>\n  </select>" but got "<select>\n    <option>option</option>\n    \n      \n    \n  </select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7
  FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test6 - assert_equals: test6 expected "<select multiple=\"\" size=\"1\">\n    <button>\n      <selectedcontent>\n        <selectedcontent></selectedcontent>\n      </selectedcontent>\n      <selectedcontent>\n        <selectedcontent></selectedcontent>\n      </selectedcontent>\n    </button>\n    <option>option</option>\n  </select>" but got "<select multiple=\"\" size=\"1\">\n    \n      \n        \n      \n      \n        \n      \n    \n    <option>option</option>\n  </select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7
  FAIL MutationObserver records during parsing of <select> with <selectedcontent>: test7 - assert_equals: test7 expected "<select>\n    <button>\n      <selectedcontent>one</selectedcontent>\n    </button>\n    <option>one</option>\n    <div></div>\n  <option selected=\"\">two</option><option selected=\"\">three</option></select>" but got "<select>\n    \n      \n    \n    <option>one</option>\n    \n  <option selected=\"\">two</option><option selected=\"\">three</option></select>"
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:463:18
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
test@http://web-platform.test:8000/resources/testharness.js:633:30
@http://web-platform.test:8000/html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html:453:7
 0:37.06 INFO Got 1 unexpected results, with 0 unexpected passes
 0:37.08 wptserve INFO Stopped http server on 127.0.0.1:8000
 0:37.08 wptserve INFO Stopped http server on 127.0.0.1:8001
 0:37.08 wptserve INFO Stopped http server on 127.0.0.1:8003
 0:37.08 wptserve INFO Stopped http server on 127.0.0.1:8002
 0:37.08 wptserve INFO Stopped http server on 127.0.0.1:8444
 0:37.08 wptserve INFO Stopped http server on 127.0.0.1:8445
 0:37.08 wptserve INFO Stopped http server on 127.0.0.1:8446
 0:37.09 wptserve INFO Stopped http server on 127.0.0.1:8443
 0:37.09 wptserve INFO Stopped http server on 127.0.0.1:9000
 0:37.10 wptserve INFO Stopped WebTransport over HTTP/3 server on 127.0.0.1:11000
 0:37.38 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:37.38 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:37.42 INFO Removed font: Ahem.ttf
 0:37.45 INFO Closing logging queue
 0:37.45 INFO queue closed
 0:37.45 INFO Tolerating 1 unexpected results
[taskcluster 2026-01-14 17:52:13.968Z] === Task Finished ===
[taskcluster 2026-01-14 17:52:14.956Z] Successful task run with exit code: 0 completed in 109.631 seconds
View more details on Community-TC Integration