Closed Bug 1979952 Opened 1 year ago Closed 1 year ago

Intermittent /css/css-content/content-none-select-1.html | single tracking bug

Categories

(Core :: Layout: Generated Content, Lists, and Counters, defect, P5)

Product:
Core
Component:
Layout: Generated Content, Lists, and Counters
Type:
defect

Tracking

()

Status:
RESOLVED FIXED
Milestone:
143 Branch
Tracking Flags:
Tracking Status
firefox-esr128 --- unaffected
firefox-esr140 --- unaffected
firefox141 --- unaffected
firefox142 --- unaffected
firefox143 --- fixed

People

(Reporter: intermittent-bug-filer, Assigned: dholbert, NeedInfo)

References

(Regression)

Details

(Keywords: intermittent-failure, intermittent-testcase, regression)

Attachments

(2 files)

screencast comparing testcase (first) to reference case (second), after zooming in on their screenshots from the test failure
41.50 KB, video/mp4
Details
Bug 1979952: Adjust WPT content-none-select-1.html to hopefully make it more robust. r?emilio
48 bytes, text/x-phabricator-request
Details | Review

Filed by: agoloman [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=519999934&repo=mozilla-central
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/bII5F5A_R1m99DwlgxCXPg/runs/0/artifacts/public/logs/live_backing.log
Reftest URL: https://hg.mozilla.org/mozilla-central/raw-file/tip/layout/tools/reftest/reftest-analyzer.xhtml#logurl=https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/bII5F5A_R1m99DwlgxCXPg/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

[task 2025-07-29T16:49:46.558+00:00] 16:49:46     INFO - TEST-START | /css/css-content/content-none-select-1.html
[task 2025-07-29T16:49:46.560+00:00] 16:49:46     INFO - PID 1597 | 1753807786559	Marionette	INFO	Testing http://web-platform.test:8000/css/css-content/content-none-select-1.html == http://web-platform.test:8000/css/css-content/content-none-select-1-ref.html
[task 2025-07-29T16:49:46.652+00:00] 16:49:46     INFO - PID 1597 | [Child 1630, Main Thread] WARNING: 'ps->NeedStyleFlush()', file /builds/worker/checkouts/gecko/dom/base/Document.cpp:18624
[task 2025-07-29T16:49:46.816+00:00] 16:49:46     INFO - PID 1597 | ### XPCOM_MEM_BLOAT_LOG defined -- logging bloat/leaks to /var/folders/q6/t31whsq522z5743mbrz982g40000jb/T/tmpng2rpch6/runtests_leaks_1007_tab_pid1635.log
[task 2025-07-29T16:49:46.819+00:00] 16:49:46     INFO - PID 1597 | [Child 1630, Main Thread] WARNING: 'ps->NeedStyleFlush()', file /builds/worker/checkouts/gecko/dom/base/Document.cpp:18624
[task 2025-07-29T16:49:46.900+00:00] 16:49:46     INFO - PID 1597 | 1753807786899	Marionette	INFO	No differences allowed
[task 2025-07-29T16:49:46.949+00:00] 16:49:46     INFO - TEST-UNEXPECTED-FAIL | /css/css-content/content-none-select-1.html | Testing http://web-platform.test:8000/css/css-content/content-none-select-1.html == http://web-platform.test:8000/css/css-content/content-none-select-1-ref.html
[task 2025-07-29T16:49:46.950+00:00] 16:49:46     INFO - Found 540 pixels different, maximum difference per channel 128
[task 2025-07-29T16:49:46.950+00:00] 16:49:46     INFO - REFTEST   IMAGE 1 (TEST): data:image/png;base64,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
[task 2025-07-29T16:49:46.950+00:00] 16:49:46     INFO - REFTEST   IMAGE 2 (REFERENCE): 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[task 2025-07-29T16:49:46.950+00:00] 16:49:46     INFO - TEST-INFO took 374ms

Looks like the difference here is that some of the dropdown arrows are positioned 1px to the left in the testcase, with respect to their placement in the reference case.

See attached screencast, showing me switching from the testcase screenshot to the reference-case screenshot, and back-and forth, for a few seconds. The screencast only shows part of the screenshot but you can see that a lot of the dropdown arrows are offset 1px left/right between the two screenshots.

Given the timing, it seems like this is a regression from the changes in bug 1979755.

Before that bug, we were comparing empty-via-content:none select-boxes (testcase) vs. actually-empty select-boxes (reference case).
Now, we're comparing nonempty select boxes (since content:none doesn't nerf the children anymore), and hence the dropdown arrow is offset rightwards due to the glyphs (the word PASS rendered with Ahem, I think).

Probably this is some subpixel font-rendering rounding subtlety which is not particularly interesting. I see the test is using font-size:5px for all of this content, and it could be using 10px instead - maybe that'd be less susceptible to triggering this rounding error. Let's try that...

Keywords: regression
Regressed by: 1979755
Flags: needinfo?(dholbert)

This passed when run in confirm failure mode (rerun the test 4x in the same session).

This indicates that the test is probably a lower frequency intermittent and harder to reproduce/debug.

Whiteboard: [collect_confirm_failure]

Set release status flags based on info from the regressing bug 1979755

status-firefox141: --- → unaffected
status-firefox142: --- → unaffected
status-firefox143: --- → affected
status-firefox-esr128: --- → unaffected
status-firefox-esr140: --- → unaffected

In particular:

  • Update the title and some metadata to match its expectations in light of bug
    1979755.
  • Increase the font size to 10px (not 5px) to attempt to avoid rounding
    inconsistencies.
  • To avoid that^ font-size-increase overshooting the WPT-viewport-size,
    decrease the amount of text on each select element, and put the select
    element into inline-block wrapper-divs so that the select buttons don't just
    stack vertically and run off the bottom of the viewport (as they nearly do
    already).
Assignee: nobody → dholbert
Status: NEW → ASSIGNED
Pushed by dholbert@mozilla.com: https://github.com/mozilla-firefox/firefox/commit/15689f53f2fd https://hg.mozilla.org/integration/autoland/rev/cc28e0f7ca66 Adjust WPT content-none-select-1.html to hopefully make it more robust. r=emilio
Created web-platform-tests PR https://github.com/web-platform-tests/wpt/pull/54040 for changes under testing/web-platform/tests

https://hg.mozilla.org/mozilla-central/rev/cc28e0f7ca66

Status: ASSIGNED → RESOLVED
Closed: 1 year ago
status-firefox143: affected → fixed
Resolution: --- → FIXED
Target Milestone: --- → 143 Branch
Upstream PR merged by moz-wptsync-bot
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