[Webkit-unassigned] [Bug 284954] New: New Test (263412 at 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

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=284954

            Bug ID: 284954
           Summary: New Test (263412 at main): [ macOS wk1 ]
                    imported/w3c/web-platform-tests/css/css-box/margin-tri
                    m/computed-margin-values/block-container-block-start-c
                    hild-with-border.html is a flaky 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: rackler at apple.com
                CC: sgill26 at apple.com,
                    webkit-bot-watchers-bugzilla at group.apple.com,
                    webkit-bug-importer at group.apple.com

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 at 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

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