Created attachment 448008 [details] Actual test result The test svg/filters/feImage-element-primitive-subregion.svg has been failing since it was added, by exactly one pixel. The offending pixel is the one at the very bottom of the green triangle.
Created attachment 448009 [details] Expected test result
Created attachment 448010 [details] Test result diff To more clearly illustrate the mismatch, here is the diff image, containing exactly one pixel.