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Webkit supports box-sizing
That's not how prefixes are handled anymore so that shouldn't be necessary, check the master branch.
Ah yes, I see.
Still needs to be changed somewhere, though I'm not familiar with the current handling of prefixes.
Latest Compass uses the Can I Use support data, but keep in mind the -webkit- prefix might not come from Chrome or Safari but might be added for a mobile device.
This is data-driven in the new release.