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Add IntersectionObserver WPT and minor tidy up

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script: Add query for effective overflow #57481

Add IntersectionObserver WPT and minor tidy up
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Community-TC Integration / wpt-firefox-nightly-stability succeeded Feb 2, 2026 in 6m 19s

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: 2026-02-02T15:50:19.595Z
Resolved: 2026-02-02T15:55:27.627Z
Task Execution Time: 5 minutes, 8 seconds, 32 milliseconds
Task Status: completed
Reason Resolved: completed
RunId: 0

Artifacts

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

WPT Command: python3 ./wpt run --channel=nightly --verify --verify-no-chaos-mode --verify-repeat-loop=0 --verify-repeat-restart=10 --github-checks-text-file=/home/test/artifacts/checkrun.md --affected base_head --log-mach-level=info --log-mach=- -y --no-pause --no-restart-on-unexpected --install-fonts --verify-log-full --no-headless --binary=/home/test/build/firefox/firefox firefox

[taskcluster 2026-02-02 15:50:19.670Z] Task ID: bp1W7sFFQUCcn692IWVUOQ
[taskcluster 2026-02-02 15:50:19.670Z] Worker ID: 6545961445613178726
[taskcluster 2026-02-02 15:50:19.670Z] Worker Group: us-east1-c
[taskcluster 2026-02-02 15:50:19.670Z] Worker Node Type: projects/757942385826/machineTypes/n2-standard-4
[taskcluster 2026-02-02 15:50:19.670Z] Worker Pool: proj-wpt/ci
[taskcluster 2026-02-02 15:50:19.670Z] Worker Version: 46.1.0
[taskcluster 2026-02-02 15:50:19.670Z] Public IP: 34.139.239.55
[taskcluster 2026-02-02 15:50:19.670Z] Hostname: proj-wpt-ci-tooo0i1jriyrimylysxkfw

[taskcluster 2026-02-02 15:50:20.462Z] === 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

...(2749 lines hidden)...

Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL Moving the target to the right bottom corner of the table. - assert_equals: entries.length expected 2 but got 1
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:172:16
step1@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:65:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL First rAF. - assert_approx_equals: entries[0].boundingClientRect.left expected 300 +/- 0 but got 0
checkRect@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:165:23
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:174:14
step0@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:55:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL Moving the target to the right bottom corner of the table. - assert_equals: entries.length expected 2 but got 1
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:172:16
step1@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:65:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL First rAF. - assert_approx_equals: entries[0].boundingClientRect.left expected 300 +/- 0 but got 0
checkRect@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:165:23
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:174:14
step0@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:55:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL Moving the target to the right bottom corner of the table. - assert_equals: entries.length expected 2 but got 1
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:172:16
step1@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:65:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL First rAF. - assert_approx_equals: entries[0].boundingClientRect.left expected 300 +/- 0 but got 0
checkRect@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:165:23
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:174:14
step0@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:55:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL Moving the target to the right bottom corner of the table. - assert_equals: entries.length expected 2 but got 1
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:172:16
step1@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:65:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL First rAF. - assert_approx_equals: entries[0].boundingClientRect.left expected 300 +/- 0 but got 0
checkRect@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:165:23
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:174:14
step0@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:55:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL Moving the target to the right bottom corner of the table. - assert_equals: entries.length expected 2 but got 1
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:172:16
step1@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:65:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL First rAF. - assert_approx_equals: entries[0].boundingClientRect.left expected 300 +/- 0 but got 0
checkRect@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:165:23
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:174:14
step0@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:55:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL Moving the target to the right bottom corner of the table. - assert_equals: entries.length expected 2 but got 1
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:172:16
step1@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:65:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL First rAF. - assert_approx_equals: entries[0].boundingClientRect.left expected 300 +/- 0 but got 0
checkRect@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:165:23
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:174:14
step0@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:55:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL Moving the target to the right bottom corner of the table. - assert_equals: entries.length expected 2 but got 1
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:172:16
step1@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:65:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL First rAF. - assert_approx_equals: entries[0].boundingClientRect.left expected 300 +/- 0 but got 0
checkRect@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:165:23
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:174:14
step0@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:55:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL Moving the target to the right bottom corner of the table. - assert_equals: entries.length expected 2 but got 1
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:172:16
step1@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:65:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL First rAF. - assert_approx_equals: entries[0].boundingClientRect.left expected 300 +/- 0 but got 0
checkRect@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:165:23
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:174:14
step0@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:55:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
  FAIL Moving the target to the right bottom corner of the table. - assert_equals: entries.length expected 2 but got 1
checkLastEntry@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:172:16
step1@http://web-platform.test:8000/intersection-observer/root-is-table-with-overflow-scroll.html:65:17
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func_done/<@http://web-platform.test:8000/resources/testharness.js:2944:32
callback@http://web-platform.test:8000/intersection-observer/resources/intersection-observer-test-utils.js:80:13
Test.prototype.step_timeout/<@http://web-platform.test:8000/resources/testharness.js:2990:25
Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
Test.prototype.step_func/<@http://web-platform.test:8000/resources/testharness.js:2916:35
 1:27.87 INFO Got 10 unexpected results, with 0 unexpected passes
 1:27.87 wptserve INFO Stopped http server on 127.0.0.1:8000
 1:27.88 wptserve INFO Stopped http server on 127.0.0.1:8001
 1:27.88 wptserve INFO Stopped http server on 127.0.0.1:8002
 1:27.88 wptserve INFO Stopped http server on 127.0.0.1:8003
 1:27.88 wptserve INFO Stopped http server on 127.0.0.1:8443
 1:27.90 wptserve INFO Stopped http server on 127.0.0.1:8444
 1:27.90 wptserve INFO Stopped http server on 127.0.0.1:8445
 1:27.90 wptserve INFO Stopped http server on 127.0.0.1:8446
 1:27.90 wptserve INFO Stopped http server on 127.0.0.1:9000
 1:27.90 wptserve INFO Stopped WebTransport over HTTP/3 server on 127.0.0.1:11000
 1:28.34 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8888))
 1:28.34 wptserve INFO Close on: (<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('127.0.0.1', 8889))
 1:28.37 INFO Removed font: Ahem.ttf
 1:28.40 INFO Closing logging queue
 1:28.40 INFO queue closed
 1:28.41 INFO ::: Ran 10 of expected 10 iterations.
 1:28.41 INFO ## All results ##

 1:28.41 INFO ### /intersection-observer/root-is-table-with-overflow-scroll.html ###
 1:28.41 INFO |                             Subtest                              | Results |                                         Messages                                        |
 1:28.41 INFO |------------------------------------------------------------------|---------|-----------------------------------------------------------------------------------------|
 1:28.41 INFO |                                                                  | OK      |                                                                                         |
 1:28.41 INFO | `IntersectionObserver observing an element inside a root table.` | PASS    |                                                                                         |
 1:28.41 INFO | `First rAF.`                                                     | FAIL    | `assert_approx_equals: entries[0].boundingClientRect.left expected 300 +/- 0 but got 0` |
 1:28.41 INFO | `Moving the target to the right bottom corner of the table.`     | FAIL    | `assert_equals: entries.length expected 2 but got 1`                                    |
 1:28.41 INFO 
 1:28.41 INFO ::: Running tests in a loop with restarts 10 times : PASS
 1:28.41 INFO :::
 1:28.41 INFO ::: Test verification PASS
 1:28.41 INFO :::
[taskcluster 2026-02-02 15:55:26.401Z] === Task Finished ===
[taskcluster 2026-02-02 15:55:26.785Z] Successful task run with exit code: 0 completed in 307.116 seconds
View more details on Community-TC Integration