1978560 - Perma /html/semantics/embedded-content/the-img-element/source-relevant-mutations.html | Neither the removing, moving, nor insertion steps for the source element track the previous - when Gecko 143 merges to beta on 2025-08-18

Status: VERIFIED FIXED

(Core :: DOM: Core & HTML, defect)

Description

[amarc]

Central-as-beta-simulation

How to run these simulations

Failure log

• Failure snippet:

[task 2025-07-22T11:53:39.720+00:00] 11:53:39     INFO - TEST-START | /html/semantics/embedded-content/the-img-element/source-relevant-mutations.html
[task 2025-07-22T11:53:39.726+00:00] 11:53:39     INFO - Closing window c7d901b9-e6c7-47ac-aa58-f6957830789c
[task 2025-07-22T11:53:39.976+00:00] 11:53:39     INFO - 
[task 2025-07-22T11:53:39.976+00:00] 11:53:39     INFO - TEST-UNEXPECTED-FAIL | /html/semantics/embedded-content/the-img-element/source-relevant-mutations.html | Neither the removing, moving, nor insertion steps for the source element track the previous 'next sibling' pointer when triggering relevant mutations for remaining child image elements of its old parent - promise_test: Unhandled rejection with value: object "TypeError: document.body.moveBefore is not a function"
[task 2025-07-22T11:53:39.978+00:00] 11:53:39     INFO - TEST-OK | /html/semantics/embedded-content/the-img-element/source-relevant-mutations.html | took 260ms
[task 2025-07-22T11:53:39.980+00:00] 11:53:39     INFO - PID 8592 | 1753185219979	Marionette	INFO	Stopped listening on port 49331
[task 2025-07-22T11:53:40.270+00:00] 11:53:40     INFO - Browser exited with return code 572
[task 2025-07-22T11:53:40.273+00:00] 11:53:40     INFO - Closing logging queue
[task 2025-07-22T11:53:40.273+00:00] 11:53:40     INFO - queue closed
[task 2025-07-22T11:53:41.017+00:00] 11:53:41     INFO - Application command: D:\task_175318324986581\build\application\firefox\firefox.exe -marionette -remote-allow-system-access about:blank --wait-for-browser -profile C:\Users\task_175318324986581\AppData\Local\Temp\tmpwrdz4pin
[task 2025-07-22T11:53:41.027+00:00] 11:53:41     INFO - PID 4448 | 1753184894332	Marionette	INFO	Marionette enabled
[task 2025-07-22T11:53:41.028+00:00] 11:53:41     INFO - PID 4448 | 1753184894465	Marionette	INFO	Listening on port 49345
[task 2025-07-22T11:53:41.028+00:00] 11:53:41     INFO - PID 4448 | console.error: services.settings:
[task 2025-07-22T11:53:41.029+00:00] 11:53:41     INFO - PID 4448 |   Message: EmptyDatabaseError: "main/nimbus-desktop-experiments" has not been synced yet
[task 2025-07-22T11:53:41.030+00:00] 11:53:41     INFO - PID 4448 |   Stack:
[task 2025-07-22T11:53:41.031+00:00] 11:53:41     INFO - PID 4448 |     EmptyDatabaseError@resource://services-settings/Database.sys.mjs:19:5
[task 2025-07-22T11:53:41.031+00:00] 11:53:41     INFO - PID 4448 | list@resource://services-settings/Database.sys.mjs:96:13
[task 2025-07-22T11:53:41.032+00:00] 11:53:41     INFO - PID 4448 | console.error: services.settings:
[task 2025-07-22T11:53:41.033+00:00] 11:53:41     INFO - PID 4448 |   Message: EmptyDatabaseError: "main/nimbus-secure-experiments" has not been synced yet
[task 2025-07-22T11:53:41.034+00:00] 11:53:41     INFO - PID 4448 |   Stack:
[task 2025-07-22T11:53:41.035+00:00] 11:53:41     INFO - PID 4448 |     EmptyDatabaseError@resource://services-settings/Database.sys.mjs:19:5
[task 2025-07-22T11:53:41.036+00:00] 11:53:41     INFO - PID 4448 | list@resource://services-settings/Database.sys.mjs:96:13
[task 2025-07-22T11:53:41.036+00:00] 11:53:41     INFO - Starting runner
[task 2025-07-22T11:53:42.323+00:00] 11:53:42     INFO - TEST-START | /html/semantics/embedded-content/the-img-element/srcset/avoid-reload-on-resize.html

Comment 1

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

:smaug, since you are the author of the regressor, bug 1923880, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 2

[Serban Stanca [:SerbanS]]

Verified fixed in today’s beta simulation push.