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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ Mac wk1 ] imported/w3c/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-002.html is a flaky failure"
   href="https://bugs.webkit.org/show_bug.cgi?id=228704">228704</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[ Mac wk1 ] imported/w3c/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-002.html is a flaky failure
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>MathML
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned@lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>ehutchison@apple.com
          </td>
        </tr></table>
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        <pre>imported/w3c/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-002.html 

is a flaky on Mac wk1.

History: <a href="https://results.webkit.org/?platform=mac&suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fmathml%2Frelations%2Fhtml5-tree%2Fdynamic-childlist-002.html">https://results.webkit.org/?platform=mac&suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fmathml%2Frelations%2Fhtml5-tree%2Fdynamic-childlist-002.html</a>

Results: <a href="https://build.webkit.org/results/Apple-Catalina-Release-WK1-Tests/r280520%20(4488)/results.html">https://build.webkit.org/results/Apple-Catalina-Release-WK1-Tests/r280520%20(4488)/results.html</a>

Diff:
--- /Volumes/Data/worker/bigsur-debug-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-002-expected.txt
+++ /Volumes/Data/worker/bigsur-debug-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-002-actual.txt
@@ -1,5 +1,5 @@

-FAIL Appending and removing children to maction assert_approx_equals: block position (child 0) expected -26 +/- 1 but got -70
+FAIL Appending and removing children to maction assert_approx_equals: block position (child 0) expected -40 +/- 1 but got -58
 PASS Appending and removing children to menclose
 PASS Appending and removing children to merror
 FAIL Appending and removing children to mfrac assert_approx_equals: block position (child 0) expected 0 +/- 1 but got 2.375

Reproduced issue on <a href="https://commits.webkit.org/r280528">r280528</a> using run-webkit-tests -1 -f --iterations 500 --exit-after-n-failures 1 imported/w3c/web-platform-tests/mathml/relations/html5-tree/dynamic-childlist-002.html.</pre>
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