Created attachment 425024 [details] image diff of the failure The test imported/w3c/web-platform-tests/mathml/presentation-markup/operators/mo-form-dynamic-002.html is flaky and sometimes it fails. When it fails it gives this: https://build.webkit.org/results/GTK-Linux-64-bit-Release-Tests/r275401%20(970)/imported/w3c/web-platform-tests/mathml/presentation-markup/operators/mo-form-dynamic-002-diffs.html Passing something like "--repeat-each=1000" to run-webkit-tests may help to reproduce the issue
Updated expectations on r275423
The test or tests filed under this bug are not failing anymore. Test expectations updated in https://commits.webkit.org/258724@main.