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Test script child mutation does not trigger script execution

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Test script child mutation doees not trigger script execution #58601

Test script child mutation does not trigger script execution
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Community-TC Integration / wpt-chrome-dev-stability succeeded Mar 18, 2026 in 3m 53s

Community-TC (pull_request)

Verify that all tests affected by a pull request are stable when executed in chrome.

Details

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

Task Status

Started: 2026-03-18T21:34:07.268Z
Resolved: 2026-03-18T21:37:03.442Z
Task Execution Time: 2 minutes, 56 seconds, 174 milliseconds
Task Status: completed
Reason Resolved: completed
TaskId: LvzbnuNEQoi34gjMgswwyA
RunId: 0

Artifacts

- public/logs/live_backing.log
- public/logs/live.log
- public/results/checkrun.md

WPT Command: python3 ./wpt run --channel=dev --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 --enable-swiftshader --install-browser --install-webdriver chrome

[taskcluster 2026-03-18 21:34:07.454Z] Task ID: LvzbnuNEQoi34gjMgswwyA
[taskcluster 2026-03-18 21:34:07.454Z] Worker ID: 6338027987024651467
[taskcluster 2026-03-18 21:34:07.454Z] Worker Group: us-east4-c
[taskcluster 2026-03-18 21:34:07.454Z] Worker Node Type: projects/757942385826/machineTypes/n2-standard-4
[taskcluster 2026-03-18 21:34:07.454Z] Worker Pool: proj-wpt/ci
[taskcluster 2026-03-18 21:34:07.454Z] Worker Version: 46.1.0
[taskcluster 2026-03-18 21:34:07.454Z] Public IP: 34.48.174.157
[taskcluster 2026-03-18 21:34:07.454Z] Hostname: proj-wpt-ci-t6izq0uls9ijbn9jnxy40a

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 0:26.75 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 10 checks (5 subtests, 5 tests)
Expected results: 10
Unexpected results: 0
OK
 0:26.75 INFO Got 0 unexpected results, with 0 unexpected passes
 0:26.75 INFO Repetition 6 / 10
 0:26.75 SUITE_START: web-platform-test - running 1 tests
 0:26.75 INFO Using 1 child processes
 0:26.76 INFO Starting WebDriver: /home/test/web-platform-tests/_venv3/bin/chrome/chromedriver --port=53939 --ignore-explicit-port --url-base=/ --enable-chrome-logs --disable-build-check
 0:26.77 INFO Got WebDriver port 37095
 0:26.87 pid:3047 Full command: /home/test/web-platform-tests/_venv3/bin/chrome/chromedriver --port=53939 --ignore-explicit-port --url-base=/ --enable-chrome-logs --disable-build-check
pid:3047 Starting ChromeDriver 148.0.7730.2 (7464182a08f297ebce1a74acfb1b000ca3536bd1-refs/branch-heads/7730@{#6}) on port 0
 0:26.87 pid:3047 Only local connections are allowed.
 0:26.87 pid:3047 Please see https://chromedriver.chromium.org/security-considerations for suggestions on keeping ChromeDriver safe.
 0:26.87 pid:3047 ChromeDriver was started successfully on port 37095.
 0:26.87 INFO Webdriver started successfully.
 0:26.87 INFO Starting runner
 0:27.41 pid:3047 [3096:3096:0318/213650.477173:WARNING:sandbox/policy/linux/sandbox_linux.cc:405] InitializeSandbox() called with multiple threads in process gpu-process.
 0:27.41 pid:3047 [3096:3096:0318/213650.480635:WARNING:ui/gfx/linux/gbm_support_x11.cc:48] dri3 extension not supported.
 0:27.57 pid:3047 [1773869810.636][WARNING]: You are using an unsupported command-line switch: --disable-build-check. Please don't report bugs that cannot be reproduced with this switch removed.
 0:27.58 pid:3047 [3064:3064:0318/213650.642939:ERROR:dbus/object_proxy.cc:572] Failed to call method: org.freedesktop.DBus.Properties.GetAll: object_path= /org/freedesktop/UPower/devices/DisplayDevice: org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.UPower was not provided by any .service files
 0:27.58 pid:3047 [3064:3064:0318/213650.642954:WARNING:dbus/property.cc:174] GetAll request failed for: org.freedesktop.UPower.Device
 0:27.61 pid:3047 [3064:3064:0318/213650.672487:WARNING:ui/base/idle/idle_linux.cc:111] None of the known D-Bus ScreenSaver services could be used.
 0:27.68 TEST_START: /html/semantics/scripting-1/the-script-element/script-runs-on-character-data-mutation.window.html
 0:27.89 TEST_END: Test OK. Subtests passed 1/1. Unexpected 0
 0:27.89 INFO No more tests
 0:27.95 INFO Closing logging queue
 0:27.95 INFO queue closed
 0:28.01 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 12 checks (6 subtests, 6 tests)
Expected results: 12
Unexpected results: 0
OK
 0:28.01 INFO Got 0 unexpected results, with 0 unexpected passes
 0:28.01 INFO Repetition 7 / 10
 0:28.01 SUITE_START: web-platform-test - running 1 tests
 0:28.01 INFO Using 1 child processes
 0:28.01 INFO Starting WebDriver: /home/test/web-platform-tests/_venv3/bin/chrome/chromedriver --port=55417 --ignore-explicit-port --url-base=/ --enable-chrome-logs --disable-build-check
 0:28.03 INFO Got WebDriver port 36235
 0:28.12 pid:3214 Full command: /home/test/web-platform-tests/_venv3/bin/chrome/chromedriver --port=55417 --ignore-explicit-port --url-base=/ --enable-chrome-logs --disable-build-check
pid:3214 Starting ChromeDriver 148.0.7730.2 (7464182a08f297ebce1a74acfb1b000ca3536bd1-refs/branch-heads/7730@{#6}) on port 0
 0:28.12 pid:3214 Only local connections are allowed.
 0:28.12 pid:3214 Please see https://chromedriver.chromium.org/security-considerations for suggestions on keeping ChromeDriver safe.
 0:28.12 pid:3214 ChromeDriver was started successfully on port 36235.
 0:28.12 INFO Webdriver started successfully.
 0:28.12 INFO Starting runner
 0:28.67 pid:3214 [3263:3263:0318/213651.731258:WARNING:sandbox/policy/linux/sandbox_linux.cc:405] InitializeSandbox() called with multiple threads in process gpu-process.
 0:28.67 pid:3214 [3263:3263:0318/213651.734779:WARNING:ui/gfx/linux/gbm_support_x11.cc:48] dri3 extension not supported.
 0:28.70 pid:3214 [1773869811.768][WARNING]: You are using an unsupported command-line switch: --disable-build-check. Please don't report bugs that cannot be reproduced with this switch removed.
 0:28.81 pid:3214 [3231:3231:0318/213651.876449:ERROR:dbus/object_proxy.cc:572] Failed to call method: org.freedesktop.DBus.Properties.GetAll: object_path= /org/freedesktop/UPower/devices/DisplayDevice: org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.UPower was not provided by any .service files
 0:28.81 pid:3214 [3231:3231:0318/213651.876462:WARNING:dbus/property.cc:174] GetAll request failed for: org.freedesktop.UPower.Device
 0:28.84 pid:3214 [3231:3231:0318/213651.903982:WARNING:ui/base/idle/idle_linux.cc:111] None of the known D-Bus ScreenSaver services could be used.
 0:28.92 TEST_START: /html/semantics/scripting-1/the-script-element/script-runs-on-character-data-mutation.window.html
 0:29.14 TEST_END: Test OK. Subtests passed 1/1. Unexpected 0
 0:29.14 INFO No more tests
 0:29.20 INFO Closing logging queue
 0:29.20 INFO queue closed
 0:29.26 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 14 checks (7 subtests, 7 tests)
Expected results: 14
Unexpected results: 0
OK
 0:29.26 INFO Got 0 unexpected results, with 0 unexpected passes
 0:29.26 INFO Repetition 8 / 10
 0:29.26 SUITE_START: web-platform-test - running 1 tests
 0:29.26 INFO Using 1 child processes
 0:29.26 INFO Starting WebDriver: /home/test/web-platform-tests/_venv3/bin/chrome/chromedriver --port=37889 --ignore-explicit-port --url-base=/ --enable-chrome-logs --disable-build-check
 0:29.28 INFO Got WebDriver port 38987
 0:29.37 pid:3382 Full command: /home/test/web-platform-tests/_venv3/bin/chrome/chromedriver --port=37889 --ignore-explicit-port --url-base=/ --enable-chrome-logs --disable-build-check
pid:3382 Starting ChromeDriver 148.0.7730.2 (7464182a08f297ebce1a74acfb1b000ca3536bd1-refs/branch-heads/7730@{#6}) on port 0
 0:29.37 pid:3382 Only local connections are allowed.
 0:29.37 pid:3382 Please see https://chromedriver.chromium.org/security-considerations for suggestions on keeping ChromeDriver safe.
 0:29.37 pid:3382 ChromeDriver was started successfully on port 38987.
 0:29.37 INFO Webdriver started successfully.
 0:29.37 INFO Starting runner
 0:29.93 pid:3382 [3430:3430:0318/213652.990622:WARNING:sandbox/policy/linux/sandbox_linux.cc:405] InitializeSandbox() called with multiple threads in process gpu-process.
 0:29.93 pid:3382 [3430:3430:0318/213652.995010:WARNING:ui/gfx/linux/gbm_support_x11.cc:48] dri3 extension not supported.
 0:29.95 pid:3382 [1773869813.018][WARNING]: You are using an unsupported command-line switch: --disable-build-check. Please don't report bugs that cannot be reproduced with this switch removed.
 0:30.05 pid:3382 [3399:3399:0318/213653.118281:ERROR:dbus/object_proxy.cc:572] Failed to call method: org.freedesktop.DBus.Properties.GetAll: object_path= /org/freedesktop/UPower/devices/DisplayDevice: org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.UPower was not provided by any .service files
 0:30.05 pid:3382 [3399:3399:0318/213653.118784:WARNING:dbus/property.cc:174] GetAll request failed for: org.freedesktop.UPower.Device
 0:30.07 pid:3382 [3399:3399:0318/213653.139800:WARNING:ui/base/idle/idle_linux.cc:111] None of the known D-Bus ScreenSaver services could be used.
 0:30.15 TEST_START: /html/semantics/scripting-1/the-script-element/script-runs-on-character-data-mutation.window.html
 0:30.38 TEST_END: Test OK. Subtests passed 1/1. Unexpected 0
 0:30.38 INFO No more tests
 0:30.43 INFO Closing logging queue
 0:30.43 INFO queue closed
 0:30.49 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 16 checks (8 subtests, 8 tests)
Expected results: 16
Unexpected results: 0
OK
 0:30.49 INFO Got 0 unexpected results, with 0 unexpected passes
 0:30.49 INFO Repetition 9 / 10
 0:30.49 SUITE_START: web-platform-test - running 1 tests
 0:30.49 INFO Using 1 child processes
 0:30.50 INFO Starting WebDriver: /home/test/web-platform-tests/_venv3/bin/chrome/chromedriver --port=55193 --ignore-explicit-port --url-base=/ --enable-chrome-logs --disable-build-check
 0:30.51 INFO Got WebDriver port 39759
 0:30.60 pid:3549 Full command: /home/test/web-platform-tests/_venv3/bin/chrome/chromedriver --port=55193 --ignore-explicit-port --url-base=/ --enable-chrome-logs --disable-build-check
pid:3549 Starting ChromeDriver 148.0.7730.2 (7464182a08f297ebce1a74acfb1b000ca3536bd1-refs/branch-heads/7730@{#6}) on port 0
 0:30.60 pid:3549 Only local connections are allowed.
 0:30.61 pid:3549 Please see https://chromedriver.chromium.org/security-considerations for suggestions on keeping ChromeDriver safe.
 0:30.61 pid:3549 ChromeDriver was started successfully on port 39759.
 0:30.61 INFO Webdriver started successfully.
 0:30.61 INFO Starting runner
 0:31.21 pid:3549 [3598:3598:0318/213654.276733:WARNING:sandbox/policy/linux/sandbox_linux.cc:405] InitializeSandbox() called with multiple threads in process gpu-process.
 0:31.21 pid:3549 [3598:3598:0318/213654.280645:WARNING:ui/gfx/linux/gbm_support_x11.cc:48] dri3 extension not supported.
 0:31.32 pid:3549 [1773869814.384][WARNING]: You are using an unsupported command-line switch: --disable-build-check. Please don't report bugs that cannot be reproduced with this switch removed.
 0:31.43 pid:3549 [3566:3566:0318/213654.492463:ERROR:dbus/object_proxy.cc:572] Failed to call method: org.freedesktop.DBus.Properties.GetAll: object_path= /org/freedesktop/UPower/devices/DisplayDevice: org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.UPower was not provided by any .service files
 0:31.43 pid:3549 [3566:3566:0318/213654.492478:WARNING:dbus/property.cc:174] GetAll request failed for: org.freedesktop.UPower.Device
 0:31.45 pid:3549 [3566:3566:0318/213654.514703:WARNING:ui/base/idle/idle_linux.cc:111] None of the known D-Bus ScreenSaver services could be used.
 0:31.57 TEST_START: /html/semantics/scripting-1/the-script-element/script-runs-on-character-data-mutation.window.html
 0:32.07 TEST_END: Test OK. Subtests passed 1/1. Unexpected 0
 0:32.07 INFO No more tests
 0:32.12 INFO Closing logging queue
 0:32.12 INFO queue closed
 0:32.18 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 18 checks (9 subtests, 9 tests)
Expected results: 18
Unexpected results: 0
OK
 0:32.18 INFO Got 0 unexpected results, with 0 unexpected passes
 0:32.18 INFO Repetition 10 / 10
 0:32.18 SUITE_START: web-platform-test - running 1 tests
 0:32.18 INFO Using 1 child processes
 0:32.19 INFO Starting WebDriver: /home/test/web-platform-tests/_venv3/bin/chrome/chromedriver --port=33809 --ignore-explicit-port --url-base=/ --enable-chrome-logs --disable-build-check
 0:32.20 INFO Got WebDriver port 46789
 0:32.30 pid:3717 Full command: /home/test/web-platform-tests/_venv3/bin/chrome/chromedriver --port=33809 --ignore-explicit-port --url-base=/ --enable-chrome-logs --disable-build-check
pid:3717 Starting ChromeDriver 148.0.7730.2 (7464182a08f297ebce1a74acfb1b000ca3536bd1-refs/branch-heads/7730@{#6}) on port 0
 0:32.30 pid:3717 Only local connections are allowed.
 0:32.30 pid:3717 Please see https://chromedriver.chromium.org/security-considerations for suggestions on keeping ChromeDriver safe.
 0:32.30 pid:3717 ChromeDriver was started successfully on port 46789.
 0:32.30 INFO Webdriver started successfully.
 0:32.30 INFO Starting runner
 0:32.87 pid:3717 [3767:3767:0318/213655.918450:WARNING:sandbox/policy/linux/sandbox_linux.cc:405] InitializeSandbox() called with multiple threads in process gpu-process.
 0:32.87 pid:3717 [3767:3767:0318/213655.934035:WARNING:ui/gfx/linux/gbm_support_x11.cc:48] dri3 extension not supported.
 0:32.96 pid:3717 [1773869816.025][WARNING]: You are using an unsupported command-line switch: --disable-build-check. Please don't report bugs that cannot be reproduced with this switch removed.
 0:32.98 pid:3717 [3734:3734:0318/213656.048367:ERROR:dbus/object_proxy.cc:572] Failed to call method: org.freedesktop.DBus.Properties.GetAll: object_path= /org/freedesktop/UPower/devices/DisplayDevice: org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.UPower was not provided by any .service files
 0:32.98 pid:3717 [3734:3734:0318/213656.048383:WARNING:dbus/property.cc:174] GetAll request failed for: org.freedesktop.UPower.Device
 0:33.02 pid:3717 [3734:3734:0318/213656.081909:WARNING:ui/base/idle/idle_linux.cc:111] None of the known D-Bus ScreenSaver services could be used.
 0:33.09 TEST_START: /html/semantics/scripting-1/the-script-element/script-runs-on-character-data-mutation.window.html
 0:33.32 TEST_END: Test OK. Subtests passed 1/1. Unexpected 0
 0:33.32 INFO No more tests
 0:33.37 INFO Closing logging queue
 0:33.37 INFO queue closed
 0:33.44 SUITE_END

web-platform-test
~~~~~~~~~~~~~~~~~
Ran 20 checks (10 subtests, 10 tests)
Expected results: 20
Unexpected results: 0
OK
 0:33.44 INFO Got 0 unexpected results, with 0 unexpected passes
 0:33.44 wptserve INFO Stopped http server on 127.0.0.1:8001
 0:33.44 wptserve INFO Stopped http server on 127.0.0.1:8002
 0:33.44 wptserve INFO Stopped http server on 127.0.0.1:8003
 0:33.44 wptserve INFO Stopped http server on 127.0.0.1:8443
 0:33.45 wptserve INFO Stopped http server on 127.0.0.1:8000
 0:33.45 wptserve INFO Stopped http server on 127.0.0.1:8444
 0:33.45 wptserve INFO Stopped http server on 127.0.0.1:8446
 0:33.45 wptserve INFO Stopped http server on 127.0.0.1:8445
 0:33.46 wptserve INFO Stopped http server on 127.0.0.1:9000
 0:33.46 wptserve INFO Stopped WebTransport over HTTP/3 server on 127.0.0.1:11000
 0:33.91 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 0:33.91 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 0:33.96 INFO Removed font: Ahem.ttf
 0:33.98 INFO Closing logging queue
 0:33.98 INFO queue closed
 0:33.99 INFO ::: Ran 10 of expected 10 iterations.
 0:33.99 INFO ## All results ##

 0:33.99 INFO ### /html/semantics/scripting-1/the-script-element/script-runs-on-character-data-mutation.window.html ###
 0:33.99 INFO |                         Subtest                         | Results | Messages |
 0:33.99 INFO |---------------------------------------------------------|---------|----------|
 0:33.99 INFO |                                                         | OK      |          |
 0:33.99 INFO | `Script execution is never triggered on child mutation` | PASS    |          |
 0:33.99 INFO 
 0:33.99 INFO ::: Running tests in a loop with restarts 10 times : PASS
 0:33.99 INFO :::
 0:33.99 INFO ::: Test verification PASS
 0:33.99 INFO :::
[taskcluster 2026-03-18 21:37:02.296Z] === Task Finished ===
[taskcluster 2026-03-18 21:37:02.668Z] Successful task run with exit code: 0 completed in 175.216 seconds
View more details on Community-TC Integration