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>Supporting alternative browser engines is something that can be done perfectly without JIT.

Unless I missed something and the DMA requirement is along the lines of "having to allow other browser engines as long as they don't bring their own JITting Javascript engine", no, it literally can't.

Depends on whether Apple’s own browser engine requires JIT. I think the point is to ensure fair competition.

Uhm, yes, you are right.

Nope it cannot. If Apple is using JIT, which massively speeds up JS, and is denying it to competitors, then Apple is giving itself an unfair advantage and is breaking the DMA.

And you know, you’re one web search away from finding the page where Apple directly mentions access to a JIT for alternative browsers: https://developer.apple.com/support/alternative-browser-engi...