[Webkit-unassigned] [Bug 268305] New: REGRESSION (273482 at main?): [ iOS17 ] imported/w3c/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-002.html is a consistent failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=268305

            Bug ID: 268305
           Summary: REGRESSION (273482 at main?): [ iOS17 ]
                    imported/w3c/web-platform-tests/mathml/relations/html5
                    -tree/dynamic-childlist-002.html is a consistent
                    failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: darbinyan at apple.com

Description:
imported/w3c/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-002.html

Is a constant failure on iOS ToT. The suspected range is between 273481 at main and 273487 at main. 273482 at main most likely is the culprit since the change is done in RenderMathMLScripts.

This issue can be bisected to <commit> using the command: 
run-webkit-tests --root  --exit-after-n-failures 1 --debug <test>

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fmathml%2Frelations%2Fhtml5-tree%2Fdynamic-childlist-002.html&version_name=iOS%2017

Diff/Image Diff/Crash Log:
 FAIL Appending and removing children to msqrt assert_approx_equals: inline size expected 12.703125 +/- 1 but got 16.640625
 PASS Appending and removing children to mstyle
 FAIL Appending and removing children to msub assert_approx_equals: block position (child 0) expected 0 +/- 1 but got -5.875
-FAIL Appending and removing children to msubsup assert_approx_equals: block position (child 0) expected 0 +/- 1 but got 2.390625
+FAIL Appending and removing children to msubsup assert_approx_equals: block position (child 0) expected 0 +/- 1 but got 2.375
 FAIL Appending and removing children to msup assert_approx_equals: inline size expected 10.625 +/- 1 but got 0
 PASS Appending and removing children to mtable
 PASS Appending and removing children to mtext
-FAIL Appending and removing children to munder assert_approx_equals: block position (child 0) expected 0 +/- 1 but got 2.75
+FAIL Appending and removing children to munder assert_approx_equals: block position (child 0) expected 0 +/- 1 but got 3
 FAIL Appending and removing children to munderover assert_approx_equals: block position (child 0) expected 0 +/- 1 but got 7
-FAIL Appending and removing children to semantics assert_approx_equals: block position (child 0) expected -18651040 +/- 1 but got -18651060
+FAIL Appending and removing children to semantics assert_approx_equals: block position (child 0) expected -33359776 +/- 1 but got -33359796


Link:
https://build.webkit.org/results/Apple-iPadOS-17-Simulator-Debug-WK2-Tests/273490@main%20(777)/imported/w3c/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-002-pretty-diff.html

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