Only seems to timeout on Release builds: https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#tests=intersection-observer%2Fno-document-leak.html
Created attachment 350091 [details] Suppress flaky timeout
Comment on attachment 350091 [details] Suppress flaky timeout Clearing flags on attachment: 350091 Committed r236162: <https://trac.webkit.org/changeset/236162>