The following layout test is a flaky failure (harness timeout) on macOS and iOS imported/w3c/web-platform-tests/service-workers/service-worker/fetch-canvas-tainting-video.https.html Probable cause: The test was unskipped in https://trac.webkit.org/changeset/249716/webkit Flakiness Dashboard: https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=imported%2Fw3c%2Fweb-platform-tests%2Fservice-workers%2Fservice-worker%2Ffetch-canvas-tainting-video.https.html
<rdar://problem/55242968>
<rdar://problem/55243013>
I skipped the test again in https://trac.webkit.org/changeset/249741/webkit