The following layout test is flaky on Mojave WK1 fast/sub-pixel/simple-clipping.html fast/sub-pixel/sub-pixel-composited-layers.html Probable cause: These two tests are failing images in tandem and are failing due to the resulting images being zoomed in on. relating this to https://bugs.webkit.org/show_bug.cgi?id=193112 Flakiness Dashboard: https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fsub-pixel%2Fsimple-clipping.html%20fast%2Fsub-pixel%2Fsub-pixel-composited-layers.html Image Diffs: https://build.webkit.org/results/Apple%20Mojave%20Release%20WK1%20(Tests)/r239596%20(1914)/fast/sub-pixel/simple-clipping-diffs.html https://build.webkit.org/results/Apple%20Mojave%20Release%20WK1%20(Tests)/r239596%20(1914)/fast/sub-pixel/sub-pixel-composited-layers-diffs.html