Comment by JimDabell

It’s available in desktop Safari here, I’m using version 18.5 (20621.2.5.11.8).

Safari has had several security fixes since then, so you should update:

18.3: https://support.apple.com/en-us/122074

18.3.1: https://support.apple.com/en-us/122285

18.4: https://support.apple.com/en-us/122379

18.5: https://support.apple.com/en-us/122719

Also, 18.4 was a pretty big update for standards support and other features:

https://webkit.org/blog/16574/webkit-features-in-safari-18-4...