[ghostly_s]

They're talking about a gesture that's specific to the Macbook trackpad; namely, the implementation you see in Safari, which is not the typical browser 'zoom' function that increases the size of elements and reflows the page, but rather zooms in to show you a subset of the DOM canvas as rendered, like mobile browsers do. It is definitely a handy feature but to characterize it as a missing 'standard' functionality I don't think is fair. No desktop browser had this functionality until Safari ported it over from the mobile version a few releases back as I recall, though Chrome has since copied it.