221347 2021-02-03 11:28:27 -0800 REGRESSION (r272241) [MacOS wk1] imported/w3c/web-platform-tests/css/css-flexbox/overflow-auto-006.html is flaky failure 2026-01-06 13:02:09 -0800 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified RESOLVED WONTFIX InRadar P2 Normal --- 1 amir_mark webkit-unassigned ap bfulgham decademoon.bugzilla fantasai.bugs runarberg simon.fraser thorton tsavell webkit-bot-watchers-bugzilla webkit-bug-importer zalan oldest_to_newest 1725236 0 amir_mark 2021-02-03 11:28:27 -0800 imported/w3c/web-platform-tests/css/css-flexbox/overflow-auto-006.html Is flaky failing on BigSur wk1 and Catalina wk1 History: https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-flexbox%2Foverflow-auto-006.html Text Diff: --- /Volumes/Data/slave/bigsur-release-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/css/css-flexbox/overflow-auto-006-expected.txt +++ /Volumes/Data/slave/bigsur-release-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/css/css-flexbox/overflow-auto-006-actual.txt @@ -1,8 +1,24 @@ -PASS .flexbox, .inline-flexbox 1 -PASS .flexbox, .inline-flexbox 2 -PASS .flexbox, .inline-flexbox 3 -PASS .flexbox, .inline-flexbox 4 +FAIL .flexbox, .inline-flexbox 1 assert_equals: +<div class="flexbox to-be-checked" check-height="" check-accounts-scrollbar="" data-expected-height="47"> + <div class="overflow"><div style="width: 100px; height: 20px"></div></div> +</div> +height expected 47 but got 32 +FAIL .flexbox, .inline-flexbox 2 assert_equals: +<div class="flexbox row-reverse to-be-checked" check-height="" check-accounts-scrollbar="" data-expected-height="47"> + <div class="overflow"><div style="width: 100px; height: 20px"></div></div> +</div> +height expected 47 but got 32 +FAIL .flexbox, .inline-flexbox 3 assert_equals: +<div class="flexbox to-be-checked" check-height="" check-accounts-scrollbar="" data-expected-height="47"> + <div class="overflow align-self-baseline"><div style="width: 100px; height: 20px"></div></div> +</div> +height expected 47 but got 32 +FAIL .flexbox, .inline-flexbox 4 assert_equals: +<div class="flexbox row-reverse to-be-checked" check-height="" check-accounts-scrollbar="" data-expected-height="47"> + <div class="overflow align-self-baseline"><div style="width: 100px; height: 20px"></div></div> +</div> +height expected 47 but got 32 PASS .flexbox, .inline-flexbox 5 PASS .flexbox, .inline-flexbox 6 PASS .flexbox, .inline-flexbox 7 1725344 1 webkit-bug-importer 2021-02-03 14:56:00 -0800 <rdar://problem/73951150> 1725436 2 ap 2021-02-03 18:28:20 -0800 It would be good to find a repro case for this. Might be some state leaking from preceding tests. 1726125 3 amir_mark 2021-02-05 09:38:58 -0800 Unable to reproduce using command for anything before r272241: run-webkit-tests imported/w3c/web-platform-tests/css/css-flexbox/overflow-auto-006.html --iterations 1000 -f -1 1728638 4 amir_mark 2021-02-12 10:29:22 -0800 (In reply to Amir Mark Jr from comment #3) > Unable to reproduce using command for anything before r272241: > > run-webkit-tests > imported/w3c/web-platform-tests/css/css-flexbox/overflow-auto-006.html > --iterations 1000 -f -1 Clarification from my previous comment: I was able to bisect this failure to r272241. I am able to reproduce the issue on r272241 but not on r272240. Using this command: run-webkit-tests imported/w3c/web-platform-tests/css/css-flexbox/overflow-auto-006.html --iterations 1000 -f -1 1728674 5 420151 amir_mark 2021-02-12 11:07:23 -0800 Created attachment 420151 Patch 1728685 6 420151 ryanhaddad 2021-02-12 11:16:25 -0800 Comment on attachment 420151 Patch This patch doesn't apply, and it looks like you have two changes in one. 1728701 7 420157 amir_mark 2021-02-12 11:40:13 -0800 Created attachment 420157 Mark as flaky 1728705 8 420157 tsavell 2021-02-12 11:45:52 -0800 Comment on attachment 420157 Mark as flaky Clearing flags on attachment: 420157 Committed 234034@main: <https://commits.webkit.org/234034@main> 1728793 9 ap 2021-02-12 14:15:20 -0800 I guess it's not too crazy that a test with scrollbars could be flaky, yet it seems somewhat crazy. 1728797 10 simon.fraser 2021-02-12 14:27:16 -0800 Scrollbars should be determined at layout time so should not cause flakiness. 1905444 11 runarberg 2022-10-13 15:20:33 -0700 I think this bug is related to a behavior I just encountered on a website I’m developing. So if you have a container with display: flex and flex-direction: row-reverse and an overflow: auto or overflow: scroll then you cannot use the scrollbar thumb to scroll the container. I created a jsfiddle here: https://jsfiddle.net/u0mrwdz2 This example works fine in Firefox and Chrome, however in Safari this scrolls fine except if you click and drag the scrollbar thumb to the position you want. Two finger scrolling, arrow key scrolling and clicking a position still works fine, it is only dragging the thumb that is broken. If you change the flex-direction to row, then this works fine again. 1968587 12 decademoon.bugzilla 2023-07-28 00:54:35 -0700 I just encountered the same bug as above regarding row-reverse and overflow auto. It's still an issue. 2009957 13 fantasai.bugs 2024-02-01 16:47:00 -0800 I think the reversing issues are https://bugs.webkit.org/show_bug.cgi?id=250207 actually. 2010009 14 fantasai.bugs 2024-02-01 20:23:31 -0800 Actually maybe it's https://bugs.webkit.org/show_bug.cgi?id=256995 2169699 15 jbedard 2026-01-06 13:02:09 -0800 Closing WebKitLegacy testing bugs as we cut-back WebKitLegacy testing. See https://bugs.webkit.org/show_bug.cgi?id=304436. 420151 2021-02-12 11:07:23 -0800 2021-02-12 11:40:09 -0800 Patch bug-221347-20210212140722.patch text/plain 2779 amir_mark U3VidmVyc2lvbiBSZXZpc2lvbjogMjcyNjcwCmRpZmYgLS1naXQgYS9MYXlvdXRUZXN0cy9DaGFu Z2VMb2cgYi9MYXlvdXRUZXN0cy9DaGFuZ2VMb2cKaW5kZXggMTVjZjQ5ZGY4Mzg0YWY0ZmQyNmVj OWQyNTM4NGNhMjEyZmRjMTI5NS4uZWEwZTA1YWUwZjc0ZjVjMTE1MGYwNjI2ZWY4YjY1ZWYyYmI0 MDA1MCAxMDA2NDQKLS0tIGEvTGF5b3V0VGVzdHMvQ2hhbmdlTG9nCisrKyBiL0xheW91dFRlc3Rz L0NoYW5nZUxvZwpAQCAtMSwzICsxLDIxIEBACisyMDIxLTAyLTEyICBBbWlyIE1hcmsgSnIgIDxh bWlyX21hcmtAYXBwbGUuY29tPgorCisgICAgICAgIFJFR1JFU1NJT04gKHIyNzIyNDEpIFtNYWNP UyB3azFdIGltcG9ydGVkL3czYy93ZWItcGxhdGZvcm0tdGVzdHMvY3NzL2Nzcy1mbGV4Ym94L292 ZXJmbG93LWF1dG8tMDA2Lmh0bWwgaXMgZmxha3kgZmFpbHVyZS4KKyAgICAgICAgaHR0cHM6Ly9i dWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIyMTM0NworCisgICAgICAgIFVucmV2aWV3 ZWQgdGVzdCBnYXJkZW5pbmcuCisKKyAgICAgICAgKiBwbGF0Zm9ybS9tYWMtd2sxL1Rlc3RFeHBl 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2021-02-12 11:40:13 -0800 2021-02-12 14:15:39 -0800 Mark as flaky bug-221347-20210212144012.patch text/plain 1484 amir_mark U3VidmVyc2lvbiBSZXZpc2lvbjogMjcyNzk3CmRpZmYgLS1naXQgYS9MYXlvdXRUZXN0cy9DaGFu Z2VMb2cgYi9MYXlvdXRUZXN0cy9DaGFuZ2VMb2cKaW5kZXggZTY4MGQ2NmRlZjQ3ZjliZWE1YjFk NDczNzEzOWFiYzgwNDhmM2JlZS4uODk2NzZmOTA0ZDI0YjZiZjc3N2U4OWVkNDBiMDFlM2YzYTFl OGQ5NSAxMDA2NDQKLS0tIGEvTGF5b3V0VGVzdHMvQ2hhbmdlTG9nCisrKyBiL0xheW91dFRlc3Rz L0NoYW5nZUxvZwpAQCAtMSwzICsxLDEyIEBACisyMDIxLTAyLTEyICBBbWlyIE1hcmsgSnIgIDxh bWlyX21hcmtAYXBwbGUuY29tPgorCisgICAgICAgIFJFR1JFU1NJT04gKHIyNzIyNDEpIFtNYWNP UyB3azFdIGltcG9ydGVkL3czYy93ZWItcGxhdGZvcm0tdGVzdHMvY3NzL2Nzcy1mbGV4Ym94L292 ZXJmbG93LWF1dG8tMDA2Lmh0bWwgaXMgZmxha3kgZmFpbHVyZS4KKyAgICAgICAgaHR0cHM6Ly9i dWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIyMTM0NworCisgICAgICAgIFVucmV2aWV3 ZWQgdGVzdCBnYXJkZW5pbmcuCisKKyAgICAgICAgKiBwbGF0Zm9ybS9tYWMtd2sxL1Rlc3RFeHBl Y3RhdGlvbnM6CisKIDIwMjEtMDItMTIgIFNlcmdpbyBWaWxsYXIgU2VuaW4gIDxzdmlsbGFyQGln 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