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They must have removed that: if you're building your own browser you definitely want to be able to inject JavaScript code, because one of your few options for differentiating yourself on iOS is supporting browser features that Apple hasn't prioritized implementing yet. Both Chrome and Firefox do this by injecting polyfills.

You're probably right but it's not like Apple wouldn't take the chance to kill that off if they thought they could get away with it

https://github.com/WebKit/WebKit/commit/aa041a623cf40c0d2f17...

It does not seem to be the case on macOS.