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Re:Apple’s iOS7 Native JavaScript Bridge by antimagic on Friday November 22, 2013 @11:56AM (#6781955)
More exactly, the kernel does provide a way for applications to mark memory pages as executable (which is exactly what Safari does, after all), but you need to have the right permissions to use the API, and App Store apps don't have those permissions...
Re:Apple’s iOS7 Native JavaScript Bridge by edvinbesic on Friday November 22, 2013 @06:22PM (#6784415)
Even more exactly, there are ways but if you use them there is no way to publish on the App Store, because private API.

There is no reason not to have JIT or WebGL in a WebView other then apple not wanting you to, even though this was the original vision of the platform.