imported/w3c/css/css-color-3/t424-hsl-parsing-f.xht and imported/w3c/css/css-color-3/t425-hsla-parsing-f.xht sometimes have an image diff, first failure is r192730 https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20(Tests)/r196216%20(13627)/results.html
The test(s) filed under this bug have been consistently passing for the last 4000 revisions. Marking bug as fixed. Committed r263254: <https://trac.webkit.org/changeset/263254>