AVIF coming to Safari & Safari on iOS 16

[Schweinepriester]

• https://twitter.com/jaffathecake/status/1540697894683942912
• [Cocoa] Support AVIF images for macOS Ventura and iOS 16 WebKit/WebKit#1717

Given it's early and not yet testable, draft for now.

@jensimmons are you able to comment on this? :)
If you are, do you know or are able to find out about support for AVIF sequences?
See note 2, Firefox doesn't have them yet: https://caniuse.com/avif
Test here: https://tests.caniuse.com/avif

[jensimmons]

Support for AVIF is not in Safari 16 beta 2, nor in Safari Technology Preview 147, so it is too early to make a change on Can I Use.

[jensimmons]

AVIF support is in macOS Ventura and iOS 16, and we did just land support for AVIF in WebKit — so support in Safari is on its way!

I'll find out about support for AVIF sequences and let you know.

[Schweinepriester]

Interesting development, potentially increasing pressure:

• https://bugzilla.mozilla.org/show_bug.cgi?id=1686338#c28
• remove the definition of the image/avif-sequence MIME type AOMediaCodec/av1-avif#86

Since animated AVIF files now use the same extension and MIME type as non-animated AVIF images, this bug constitutes an interoperability / web compatibility issue.

See the example there.

@Fyrd: Depending on how that plays out, maybe we should give partial for note 2 (for not supporting AVIF sequences)?

[jensimmons]

WebKit's implementation does support image sequence and animations.

[Fyrd]

Thanks!