1994196 - Perma /html/semantics/the-button-element/command-and-commandfor/on-popover-behavior.html | invoking (as show-popover) should create an implicit anchor reference for anchor positioning. - assert_not_equals: - when Gecko 146 merges to beta on 2025-11-10

Status: VERIFIED FIXED

(Core :: CSS Parsing and Computation, defect)

Description

[Narcis Beleuzu [:NarcisB]]

Central-as-beta simulation:
How to run these simulations:
Failure log

Log snippet:

[task 2025-10-14T11:29:24.848+00:00] 11:29:24     INFO - TEST-PASS | /html/semantics/the-button-element/command-and-commandfor/on-popover-behavior.html | invoking (as hide-popover) closed popover is noop 
[task 2025-10-14T11:29:24.848+00:00] 11:29:24     INFO - TEST-UNEXPECTED-FAIL | /html/semantics/the-button-element/command-and-commandfor/on-popover-behavior.html | invoking (as show-popover) should create an implicit anchor reference for anchor positioning. - assert_not_equals: popover should not be at the top of the window because it is anchor positioned. got disallowed value 0
[task 2025-10-14T11:29:24.848+00:00] 11:29:24     INFO - @http://web-platform.test:8000/html/semantics/the-button-element/command-and-commandfor/on-popover-behavior.html:168:22
[task 2025-10-14T11:29:24.848+00:00] 11:29:24     INFO - Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2869:25
[task 2025-10-14T11:29:24.848+00:00] 11:29:24     INFO - test@http://web-platform.test:8000/resources/testharness.js:633:30
[task 2025-10-14T11:29:24.848+00:00] 11:29:24     INFO - @http://web-platform.test:8000/html/semantics/the-button-element/command-and-commandfor/on-popover-behavior.html:161:7
[task 2025-10-14T11:29:24.849+00:00] 11:29:24     INFO - TEST-OK | /html/semantics/the-button-element/command-and-commandfor/on-popover-behavior.html | took 671ms
[task 2025-10-14T11:29:24.850+00:00] 11:29:24     INFO - PID 43436 | 1760441364844	Marionette	INFO	Stopped listening on port 35767
[task 2025-10-14T11:29:27.849+00:00] 11:29:27     INFO - Browser exited with return code -15
[task 2025-10-14T11:29:27.850+00:00] 11:29:27     INFO - Closing logging queue
[task 2025-10-14T11:29:27.851+00:00] 11:29:27     INFO - queue closed
[task 2025-10-14T11:29:27.866+00:00] 11:29:27     INFO - INFO | runtests.py | TSan using symbolizer at /builds/worker/workspace/build/application/firefox/llvm-symbolizer
[task 2025-10-14T11:29:27.867+00:00] 11:29:27     INFO - Application command: /builds/worker/workspace/build/application/firefox/firefox --marionette --remote-allow-system-access about:blank -profile /tmp/tmpcs7urm9b
[task 2025-10-14T11:29:27.883+00:00] 11:29:27     INFO - PID 43950 | ATTENTION: default value of option mesa_glthread overridden by environment.
[task 2025-10-14T11:29:27.884+00:00] 11:29:27     INFO - PID 43950 | 1760441332777	Marionette	INFO	Marionette enabled
[task 2025-10-14T11:29:27.884+00:00] 11:29:27     INFO - PID 43950 | ATTENTION: default value of option mesa_glthread overridden by environment.
[task 2025-10-14T11:29:27.885+00:00] 11:29:27     INFO - PID 43950 | 1760441333629	Marionette	INFO	Listening on port 50211
[task 2025-10-14T11:29:27.885+00:00] 11:29:27     INFO - PID 43950 | Crash Annotation GraphicsCriticalError: |[0][GFX1-]: Calling WaitFlushedEvent::Run: is delayed: 2318 (t=9.94394) [GFX1-]: Calling WaitFlushedEvent::Run: is delayed: 2318
[task 2025-10-14T11:29:27.886+00:00] 11:29:27     INFO - PID 43950 | /builds/worker/workspace/build/application/firefox/llvm-symbolizer: error: '[anon:js-executable-memory]': No such file or directory
[task 2025-10-14T11:29:27.886+00:00] 11:29:27     INFO - Starting runner

Comment 1

[David Shin[:dshin]]

Should just be a matter of adding the anchor-positioning pref, since off out of Nightly at the moment.
There's been a few of these, unfortunately.. Wonder if there's any way to automate it?

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1924210

Comment 3

[Intermittent Failures Robot]

11 failures were associated with this bug in the last 7 days.

Repository breakdown:

• try: 11

Table

	no_variant	nofis	nofis-noship
android-x86/debug			1
android-x86/opt		1	1
linux2404-x86_64/opt	1
macosx1470-x86_64/debug	3
macosx1470-x86_64/opt	2
windows11-x86/opt	1
windows11-x86_64/opt	1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1994196&startday=2025-10-13&endday=2025-10-19&tree=all

Comment 4

[Hsin-Yi Tsai (she/her) [:hsinyi]]

Moving it to CSS component, where we handle and track most of the anchor positioning shipping work.

Comment 5

[David Shin[:dshin]]

Attachment: Bug 1994196: Make sure anchor positioning pref is enabled for on-popover-behavior.html. r=#anchor-pos

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/1248ecb2efb7
https://hg.mozilla.org/integration/autoland/rev/bc71889d1272
Make sure anchor positioning pref is enabled for on-popover-behavior.html. r=jwatt

Comment 7

[amarc]

https://hg.mozilla.org/mozilla-central/rev/bc71889d1272

Comment 8

[agoloman]

Verified fixed in today's beta simulation.