Bug 284954 – New Test (263412@main): [ macOS wk1 ] imported/w3c/web-platform-tests/css/css-box/margin-trim/computed-margin-values/block-container-block-start-child-with-border.html is a flaky failure

• Component: New Bugs
• Status: NEW

[Karl Rackler]

Description:
imported/w3c/web-platform-tests/css/css-box/margin-trim/computed-margin-values/block-container-block-start-child-with-border.html

The test was added at 263412@main and has been a flaky failure on macOS wk1 since then.

This issue can be reproduced using command:
run-webkit-tests --release --no-retry --force -1 --iterations=50 imported/w3c/web-platform-tests/css/css-box/margin-trim/computed-margin-values/block-container-block-start-child-with-border.html

Result: 
Unexpected flakiness: text-only failures (1)
  imported/w3c/web-platform-tests/css/css-box/margin-trim/computed-margin-values/block-container-block-start-child-with-border.html [ Failure Pass ]

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-box%2Fmargin-trim%2Fcomputed-margin-values%2Fblock-container-block-start-child-with-border.html&flavor=wk1&recent=false

Diff:
-PASS item 1
-PASS item 2
+FAIL item 1 assert_equals:
+<item data-expected-margin-top="0" class="collapsed">
+            <item data-expected-margin-top="0" class="collapsed"></item>
+        </item>
+margin-top expected "0" but got "50"
+FAIL item 2 assert_equals:
+<item data-expected-margin-top="0" class="collapsed"></item>
+margin-top expected "0" but got "50"
 PASS item 3
 PASS item 4

[Radar WebKit Bug Importer]

<rdar://problem/141757330>

[EWS]

Test gardening commit 288089@main (ea534c6ac014): <https://commits.webkit.org/288089@main>

Reviewed commits have been landed. Closing PR #38209 and removing active labels.

[Sammy Gill]

rdar://124971386

[Sammy Gill]

Pull request: https://github.com/WebKit/WebKit/pull/38225