On some platforms css3/filters/custom/effect-custom-transform-parameters.html has a small pixel difference.
Created attachment 161367 [details] Patch V1 Trying to fix by removing the white border around the image. I had that initially to test rotations, but that never seemed to work correctly because of the anti-aliasing artifacts.
Comment on attachment 161367 [details] Patch V1 If this works we'll need to also undo http://trac.webkit.org/changeset/127068
Landed in http://trac.webkit.org/changeset/127173 .