The test returns a wrong image more or less regularly. The first flaky failure happened in: [r259933-r259935] NOERROR [r259936-r259937] UNKNOWN r259938 IMAGE PASS (Expected: PASS) [r259939-r259942] NOERROR r259943 UNKNOWN r259944 NOERROR See: https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20(Tests)/r259938%20(13300)/results.html
This is test is passing for WebKitGTK and WPE: https://results.webkit.org/?platform=WPE&platform=GTK&limit=4000&suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-position%2Fposition-sticky-scroll-with-clip-and-abspos.html However the test is marked as failure for MAC WK1: LayoutTests/platform/mac-wk1/TestExpectations:916:webkit.org/b/203466 imported/w3c/web-platform-tests/css/css-position/sticky/position-sticky-scroll-with-clip-and-abspos.html [ ImageOnlyFailure ]
The MacOS WK1 failure is filed under bug https://bugs.webkit.org/show_bug.cgi?id=203466 Closing this bug as it was originally intented to track a failure for WebKitGTK.