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https://developer.mozilla.org/en-US/docs/Web/CSS/user-select... says Safari and Safari for iOS are still -webkit- only, and I’m pretty sure that stuff gets checked and updated automatically.

Safari is only available on macOS

You must mean something by this. What do you mean?

// Written from a browser Apple calls Safari on iOS.

I assumed that by them saying "installing desktop Safari" they are using an OS other than macOS since Safari comes preinstalled on macOS and can't even be uninstalled at least not without disabling System Integrity Protection.

Yeah it's basically fine in Safari because mobile requires a double tap to highlight, but only a single click on desktop. So highlighting is more intentional on mobile than desktop.