Bug 312499 – [macOS iOS] imported/w3c/web-platform-tests/shadow-dom/reference-target/tentative/form.html is a flaky text failure.

• Component: New Bugs
• Status: NEW

[Diego De La Toba]

imported/w3c/web-platform-tests/shadow-dom/reference-target/tentative/form.html is a flaky text failure on macOS and iOS.


HISTORY:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fshadow-dom%2Freference-target%2Ftentative%2Fform.html


DIFF:
--- /Volumes/Data/worker/Apple-Tahoe-Release-AppleSilicon-WK2-Tests/build/layout-test-results/imported/w3c/web-platform-tests/shadow-dom/reference-target/tentative/form-expected.txt
+++ /Volumes/Data/worker/Apple-Tahoe-Release-AppleSilicon-WK2-Tests/build/layout-test-results/imported/w3c/web-platform-tests/shadow-dom/reference-target/tentative/form-actual.txt
@@ -5,7 +5,7 @@
 PASS Reference target works with setAttribute('form')
 FAIL Reference target works with form-associated custom element. realForm.moveBefore is not a function. (In 'realForm.moveBefore(customElementInShadow, input)', 'realForm.moveBefore' is undefined)
 FAIL Reference target works with nested shadow trees. assert_equals: The .elements property should have 3 elements. expected 3 but got 2
-FAIL Form association is updated when form is inserted in or removed from shadow DOM, including in nested shadow DOM assert_equals: The first element should be the reset button outside the shadow root. expected Element node <button id="reset-button-6" type="reset" form="fancy-form... but got Element node <input id="input-in-shadow" value="default value" form="r...
+FAIL Form association is updated when form is inserted in or removed from shadow DOM, including in nested shadow DOM assert_equals: The reset button should show the shadow host as its form property. expected Element node <fancy-form-6 id="fancy-form-6"></fancy-form-6> but got null
 FAIL Form association works for image inputs, which aren't in the elements collection assert_equals: expected Element node <fancy-form-7 id="fancy-form-7">
 
   </fancy-form-7> but got null


DIFF URL:
https://build.webkit.org/results/Apple-Tahoe-Release-AppleSilicon-WK2-Tests/311376@main%20(3306)/imported/w3c/web-platform-tests/shadow-dom/reference-target/tentative/form-pretty-diff.html


REPRODUCTION:
I was able to reproduce this on macOS and iOS 26.4 with the following:

run-webkit-tests --no-build --no-retry --no-show-results --exit-after-n-failures=1 --expect-pass --iterations=50 --force --ios-simulator --release imported/w3c/web-platform-tests/shadow-dom/reference-target/tentative/form.html

I am going to mark expectations as pass fail while this pends investigation.

[Radar WebKit Bug Importer]

<rdar://problem/174939846>

[Diego De La Toba]

Test gardening pull request: https://github.com/WebKit/WebKit/pull/62912

[EWS]

Test gardening commit 311394@main (871735e3600c): <https://commits.webkit.org/311394@main>

Reviewed commits have been landed. Closing PR #62912 and removing active labels.