[anoncake]

The OS can prevent it, but can it do so without making JIT impossible?

[andrekandre]

well, if you can’t make pages executable you can “just in time” it by interpreting and writing it to an optimized interpreter format i suppose (but it will be much slower)... as an example, see WKWebView vs UIWebView (from iOS)

[anoncake]

You can do that but slow JIT kind of misses the point.