275906 2024-06-26 10:27:00 -0700 Animated AVIF with transparency doesn't play correctly 2026-01-15 08:04:23 -0800 1 1 1 Unclassified WebKit Images Safari Technology Preview Unspecified Unspecified RESOLVED MOVED InRadar P2 Normal --- 1 jaffathecake webkit-unassigned 709922234 jean-yves.avenard jer.noble matiasbryan oliverwilliams345 rajsite sabouhallawa webkit-bug-importer zifidigital oldest_to_newest 2043206 0 jaffathecake 2024-06-26 10:27:00 -0700 https://static-misc-3.glitch.me/alpha-video-test/avif-img.html In Safari 17.5, it plays back slowly, and with incorrect transparency. Compare to Chrome or Firefox for the correct rendering (although playback performance is poor in Chrome) https://issues.chromium.org/issues/349566435. 2043224 1 webkit-bug-importer 2024-06-26 11:06:01 -0700 <rdar://problem/130607349> 2043269 2 sabouhallawa 2024-06-26 14:26:12 -0700 Thank you for the report! This is an issue below WebKit, tracked by Apple internally as rdar://130607349. 2171599 3 ap 2026-01-13 15:46:46 -0800 *** Bug 305155 has been marked as a duplicate of this bug. *** 2172185 4 zifidigital 2026-01-15 08:04:23 -0800 Seems like this hasn't been fixed yet.