Unfortunately you can't just ask the system, because browsers don't consistently use the system font, or otherwise make good choices, for system-ui. Using a sy

Unfortunately you can't just ask the system, because browsers don't consistently use the system font, or otherwise make good choices, for system-ui. Using a system font stack isn't about “a typeface that is a bit Grotesk” and more about trying to integrate with the look of the users OS. Including a @font-face will not achieve that version of “just so” unless you want to mimic one OS for everyone.