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1) I think you can build webkit on Windows? Either way, webkit is available on multiple platforms. 2) It goes both ways, Microsoft only recently announced that new versions of Edge are coming to macOS in the future, and only because they are moving to Blink/Chromium. 3) Chrome on iOS uses webkit, soooooooo

What actual complaints do you have about safari? I definitely don't think it's perfect, but Chrome has it's own weird issues and inconsistencies (and is much less efficient on macOS). Chrome is widely chided for its poor memory management.