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It loads JXL if your client supports it.

Recent builds of Chrome and Edge now support and display JXL on iOS 17. They have to use the Safari engine underneath, but previously they suppressed JXL, or maybe the shared engine did.

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Afaik WebKit added support in iOS 17 so it’s just a transitive win

There's only Safari on iOS. EVERY browser on iOS is just a skin on top of Safari's WebKit.

See 2.5.6 here - https://developer.apple.com/app-store/review/guidelines/

Wasn’t this supposed to change with iOS 17?

Apple is dropping requirements for all browsers to use WebKit, but that doesn’t mean Mozzila/Google/Brave have started releasing them, especially with iOS 17 still being a beta.

https://9to5mac.com/2023/02/07/new-iphone-browsers/

Literally specifically said that. Yet Edge and Chrome on iOS actively suppressed JXL in prior builds (yes they can do that — actually calling it a skin is technically wrong as while the engine is Safari, they have a lot of flexibility), and very recently exposed it.

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