[Webkit-unassigned] [Bug 228311] New: imported/w3c/web-platform-tests/css/css-scoping/css-scoping-shadow-dynamic-remove-style-detached.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=228311

            Bug ID: 228311
           Summary: imported/w3c/web-platform-tests/css/css-scoping/css-sc
                    oping-shadow-dynamic-remove-style-detached.html is a
                    flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ehutchison at apple.com

imported/w3c/web-platform-tests/css/css-scoping/css-scoping-shadow-dynamic-remove-style-detached.html

is a flaky failure on Mac.

History: https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-scoping%2Fcss-scoping-shadow-dynamic-remove-style-detached.html&limit=50000&platform=mac

Diff:

--- /Volumes/Data/worker/bigsur-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/css/css-scoping/css-scoping-shadow-dynamic-remove-style-detached-expected.txt
+++ /Volumes/Data/worker/bigsur-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/css/css-scoping/css-scoping-shadow-dynamic-remove-style-detached-actual.txt
@@ -1,3 +1,3 @@

-PASS Invalidation of style data while ShadowRoot is disconnected.
+FAIL Invalidation of style data while ShadowRoot is disconnected. assert_not_equals: got disallowed value "rgb(255, 0, 0)"


Issue appears to be a regression ~r280122

Reproduced on r280292 using run-webkit-tests -f --iterations 500 --clobber-old-results --exit-after-n-failures 1 imported/w3c/web-platform-tests/css/css-scoping/css-scoping-shadow-dynamic-remove-style-detached.html.

Will bisect and update.

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