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The browser certainly does. Or is this only an alternative to a WebView in an app store app?

even google wasn't able to include a JIT in Chrome for iOS

Safari uses a JIT. Other browsers and UIWebView based applications are not allowed to access the JIT, apparently because it is a security risk. Even lua based apps are not allowed to run luajit because code generation on iOS isn't allowed within apps.

There's even a massive JIT vulnerability in webkit on iOS at the moment.

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