The following layout test is flaky on macOS and iOS. imported/w3c/web-platform-tests/service-workers/service-worker/fetch-canvas-tainting-cache.https.html Probable cause: Unknown 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-cache.https.html The diff shows that this is a test harness timeout
<rdar://problem/36680924>
Marked test as flaky in https://trac.webkit.org/changeset/227263/webkit