Created attachment 331992 [details] Testcase Test looks fuzzy in Safari, fine in Chrome and FF.
Ah, we're treating width="200" height="200" on the <filter> as percentages, since the default filterUnits is objectBoundingBox, and then reducing the filter resolution accordingly.
I am able to reproduce this bug in Safari Technology Preview 175 while Chrome Canary 117 and Firefox Nightly 118 are not fuzzy / blurry.