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It does not. There is a handful of APIs that are blocked.

https://developer.apple.com/documentation/safariservices/saf...

I think a more charitable interpretation is "not implemented".

From what Apple say for Content Blocker API on iOS, I suspect that they really avoid to implement those API.

> In addition to blocking unwanted content, a Content Blocker extension protects privacy. For example, the extension doesn’t have access to users’ browsing activity and it can’t report activity to your app.

https://developer.apple.com/library/archive/documentation/Ge...

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