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Merged
chromium-wpt-export-bot merged 1 commit into from
Feb 13, 2026

Update selectedcontent element to match spec

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Merged

Update selectedcontent element to match spec #57765

Update selectedcontent element to match spec
b2ade53
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Community-TC Integration / wpt-firefox-nightly-stability succeeded Feb 13, 2026 in 4m 42s

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: 2026-02-13T02:19:13.704Z
Resolved: 2026-02-13T02:21:31.185Z
Task Execution Time: 2 minutes, 17 seconds, 481 milliseconds
Task Status: completed
Reason Resolved: completed
TaskId: eI4WQgs1S2qVNzWwdhnrWw
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 2026-02-13 02:19:13.767Z] Task ID: eI4WQgs1S2qVNzWwdhnrWw
[taskcluster 2026-02-13 02:19:13.767Z] Worker ID: 5579139168839349797
[taskcluster 2026-02-13 02:19:13.767Z] Worker Group: us-central1-c
[taskcluster 2026-02-13 02:19:13.767Z] Worker Node Type: projects/757942385826/machineTypes/n2-standard-4
[taskcluster 2026-02-13 02:19:13.767Z] Worker Pool: proj-wpt/ci
[taskcluster 2026-02-13 02:19:13.767Z] Worker Version: 46.1.0
[taskcluster 2026-02-13 02:19:13.767Z] Public IP: 34.10.218.242
[taskcluster 2026-02-13 02:19:13.767Z] Hostname: proj-wpt-ci-ac2bn4uisfsk5zmt-rdjww

[taskcluster 2026-02-13 02:19:14.847Z] === 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

...(4513 lines hidden)...

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
  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
  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
  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
  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
 1:04.54 INFO Got 10 unexpected results, with 0 unexpected passes
 1:04.54 wptserve INFO Stopped http server on 127.0.0.1:8003
 1:04.54 wptserve INFO Stopped http server on 127.0.0.1:8002
 1:04.54 wptserve INFO Stopped http server on 127.0.0.1:8000
 1:04.54 wptserve INFO Stopped http server on 127.0.0.1:8001
 1:04.55 wptserve INFO Stopped http server on 127.0.0.1:8443
 1:04.55 wptserve INFO Stopped http server on 127.0.0.1:8444
 1:04.55 wptserve INFO Stopped http server on 127.0.0.1:8445
 1:04.56 wptserve INFO Stopped http server on 127.0.0.1:8446
 1:04.56 wptserve INFO Stopped http server on 127.0.0.1:9000
 1:04.56 wptserve INFO Stopped WebTransport over HTTP/3 server on 127.0.0.1:11000
 1:04.64 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 1:04.64 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 1:04.74 INFO Removed font: Ahem.ttf
 1:04.77 INFO Closing logging queue
 1:04.77 INFO queue closed
 1:04.78 INFO ::: Ran 10 of expected 10 iterations.
 1:04.78 INFO ## All results ##

 1:04.78 INFO ### /html/semantics/forms/the-select-element/customizable-select/selectedcontent-mutations.html ###
 1:04.78 INFO |                                       Subtest                                       | Results |                                                                                                                                                                                                                                             Messages                                                                                                                                                                                                                                             |
 1:04.78 INFO |-------------------------------------------------------------------------------------|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 1:04.78 INFO |                                                                                     | OK      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
 1:04.78 INFO | `MutationObserver records during parsing of <select> with <selectedcontent>: test1` | FAIL    | `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>"`                      |
 1:04.78 INFO | `MutationObserver records during parsing of <select> with <selectedcontent>: test2` | FAIL    | `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>"`                                                                                                                                                                                                                                                                                           |
 1:04.78 INFO | `MutationObserver records during parsing of <select> with <selectedcontent>: test3` | FAIL    | `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>"`                                                              |
 1:04.78 INFO | `MutationObserver records during parsing of <select> with <selectedcontent>: test4` | FAIL    | `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>"`                                                                                         |
 1:04.78 INFO | `MutationObserver records during parsing of <select> with <selectedcontent>: test5` | FAIL    | `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>"`                                                                                                                                                                                                                                              |
 1:04.78 INFO | `MutationObserver records during parsing of <select> with <selectedcontent>: test6` | FAIL    | `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>"` |
 1:04.78 INFO | `MutationObserver records during parsing of <select> with <selectedcontent>: test7` | FAIL    | `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>"`                                                                                    |
 1:04.78 INFO 
 1:04.78 INFO ::: Running tests in a loop with restarts 10 times : PASS
 1:04.78 INFO :::
 1:04.78 INFO ::: Test verification PASS
 1:04.78 INFO :::
[taskcluster 2026-02-13 02:21:29.941Z] === Task Finished ===
[taskcluster 2026-02-13 02:21:30.352Z] Successful task run with exit code: 0 completed in 136.586 seconds
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