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https://github.com/kholia/OSX-KVM also works (also not very legal)

I don't think you really need a Mac – any browser running on WebKit should get you 95% there. GNOME Web on Linux, for example.

In a professional environment you will need to test on safari proper.

I think this greatly depends on your definition of a “professional environment”.

Also, using non-Safari WebKit for everyday testing (will my newest commit break it? should I fix something before I send the PR?) but using the proper Safari for more thorough testing (e. g. before public releases, or when a bugreport can't be reproduced otherwise) is an option too.

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