The test returns a wrong image more or less regularly. The first flaky failure happened in: [r256704-r256705] UNKNOWN r256706 NOERROR r256707 IMAGE PASS (Expected: PASS) [r256708-r256711] UNKNOWN [r256712-r256715] NOERROR See: https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20(Tests)/r259925%20(13292)/results.html
This test has been passing in the last 4000 revisions in 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%2Fz-index-blend-will-change-overlapping-layers.html There are no test failures filed under this bug in TestExpectations. Closing bug.