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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 succeeded Jan 14, 2026 in 7m 18s

Community-TC (pull_request)

Collect results for all tests affected by a pull request in firefox.

Details

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

Task Status

Started: 2026-01-14T17:50:31.885Z
Resolved: 2026-01-14T17:54:34.668Z
Task Execution Time: 4 minutes, 2 seconds, 783 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 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 17:50:31.983Z] Task ID: UvRUDafnQ7qxzBoHgISUOQ
[taskcluster 2026-01-14 17:50:31.983Z] Worker ID: 7014288583704604763
[taskcluster 2026-01-14 17:50:31.983Z] Worker Group: us-east1-c
[taskcluster 2026-01-14 17:50:31.983Z] Worker Node Type: projects/757942385826/machineTypes/n2-standard-4
[taskcluster 2026-01-14 17:50:31.983Z] Worker Pool: proj-wpt/ci
[taskcluster 2026-01-14 17:50:31.983Z] Worker Version: 46.1.0
[taskcluster 2026-01-14 17:50:31.983Z] Public IP: 35.237.210.208
[taskcluster 2026-01-14 17:50:31.983Z] Hostname: proj-wpt-ci-fwb0glcxs9ewnnhczygq5w

[taskcluster 2026-01-14 17:50:32.868Z] === 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

...(335 lines hidden)...

Setting default value
Failed to read: session.screen0.focusSameHead
Setting default value
Failed to read: session.screen0.rowPlacementDirection
Setting default value
Failed to read: session.screen0.colPlacementDirection
Setting default value
Failed to read: session.screen0.windowPlacement
Setting default value
Failed to read: session.screen0.slit.acceptKdeDockapps
Setting default value
Failed to read: session.screen0.slit.autoHide
Setting default value
Failed to read: session.screen0.slit.maxOver
Setting default value
Failed to read: session.screen0.slit.placement
Setting default value
Failed to read: session.screen0.slit.alpha
Setting default value
Failed to read: session.screen0.slit.onhead
Setting default value
Failed to read: session.screen0.slit.layer
Setting default value
Failed to read: session.screen0.toolbar.autoHide
Setting default value
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
 0:57.43 INFO Installed font: Ahem.ttf
 0:58.38 wptserve INFO Starting http server on http://127.0.0.1:8000
 0:58.40 wptserve INFO Starting http server on http://127.0.0.1:8002
 0:58.42 wptserve INFO Starting https server on https://127.0.0.1:8443
 0:58.43 wptserve INFO Starting http server on http://127.0.0.1:8001
 0:58.45 wptserve INFO Starting http server on http://127.0.0.1:8003
 0:58.47 wptserve INFO Starting https server on https://127.0.0.1:8445
 0:58.47 wptserve INFO Starting https server on https://127.0.0.1:8446
 0:58.49 wptserve INFO Starting https server on https://127.0.0.1:8444
 0:58.50 wptserve INFO Starting http2 server on https://127.0.0.1:9000
 0:58.50 wptserve INFO Create socket on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:58.51 wptserve INFO Bind on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:58.51 wptserve INFO Listen on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:58.52 wptserve INFO Create socket on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:58.52 wptserve INFO Bind on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:58.52 wptserve INFO Listen on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:58.63 wptserve INFO Starting WebTransport over HTTP/3 server on 127.0.0.1:11000
 0:58.87 SUITE_START: web-platform-test - running 1 tests
mem avail: 14428 of 15806 MiB (91.28%), swap free:    0 of    0 MiB ( 0.00%)
 1:07.83 INFO Using 1 child processes
 1:07.84 INFO Setting up ssl
 1:07.86 certutil Full command: /usr/bin/certutil -N -d /tmp/tmpf9g3wm92.mozrunner -f /tmp/tmpf9g3wm92.mozrunner/.crtdbpw
certutil b''
 1:07.89 certutil b''
 1:07.89 certutil b'\nCertificate Nickname                                         Trust Attributes\n                                                             SSL,S/MIME,JAR/XPI\n\nweb-platform-tests                                           CT,, \n'
 1:07.90 INFO Application command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank -profile /tmp/tmpvdymjh1l
 1:07.91 INFO Starting runner
 1:07.91 pid:1425 Full command: /home/test/build/firefox/firefox --marionette --remote-allow-system-access about:blank
pid:1425 [1425] Sandbox: CanCreateUserNamespace() clone() failure: EPERM
 1:08.50 pid:1425 1768413265729	Marionette	INFO	Marionette enabled
 1:08.60 pid:1425 1768413265835	Marionette	INFO	Listening on port 55171
Failed to read: session.screen0.titlebar.left
Setting default value
Failed to read: session.screen0.titlebar.right
Setting default value
 1:11.38 pid:1425 console.error: services.settings:
 1:11.39 pid:1425   Message: EmptyDatabaseError: "main/nimbus-desktop-experiments" has not been synced yet
 1:11.39 pid:1425   Stack:
 1:11.39 pid:1425     EmptyDatabaseError@resource://services-settings/Database.sys.mjs:19:5
 1:11.39 pid:1425 list@resource://services-settings/Database.sys.mjs:96:13
 1:11.55 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]
 1:11.80 TEST_START: /html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html
 1:12.47 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:462:18
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:452:7
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:462:18
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:452:7
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:462:18
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:452:7
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:462:18
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:452:7
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:462:18
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:452:7
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:462:18
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:452:7
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:462:18
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:452:7

 1:12.47 INFO No more tests
 1:12.47 pid:1425 1768413269701	Marionette	INFO	Stopped listening on port 55171
 1:13.17 INFO Browser exited with return code -15
 1:13.02 INFO Closing logging queue
 1:13.02 INFO queue closed
 1:13.17 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:462:18
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:452:7
  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:462:18
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:452:7
  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:462:18
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:452:7
  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:462:18
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:452:7
  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:462:18
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:452:7
  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:462:18
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:452:7
  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:462:18
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:452:7
 1:13.17 INFO Got 1 unexpected results, with 0 unexpected passes
 1:13.17 wptserve INFO Stopped http server on 127.0.0.1:8000
 1:13.17 wptserve INFO Stopped http server on 127.0.0.1:8001
 1:13.18 wptserve INFO Stopped http server on 127.0.0.1:8002
 1:13.18 wptserve INFO Stopped http server on 127.0.0.1:8003
 1:13.19 wptserve INFO Stopped http server on 127.0.0.1:8443
 1:13.19 wptserve INFO Stopped http server on 127.0.0.1:8444
 1:13.19 wptserve INFO Stopped http server on 127.0.0.1:8445
 1:13.19 wptserve INFO Stopped http server on 127.0.0.1:8446
 1:13.20 wptserve INFO Stopped WebTransport over HTTP/3 server on 127.0.0.1:11000
 1:13.20 wptserve INFO Stopped http server on 127.0.0.1:9000
 1:13.39 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 1:13.39 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 1:13.44 INFO Removed font: Ahem.ttf
 1:13.46 INFO Closing logging queue
 1:13.46 INFO queue closed
 1:13.46 INFO Tolerating 1 unexpected results
[taskcluster 2026-01-14 17:54:32.774Z] === Task Finished ===
[taskcluster 2026-01-14 17:54:33.824Z] Successful task run with exit code: 0 completed in 241.843 seconds
View more details on Community-TC Integration