Temporal inputs are taller than other textual inputs in OS X Safari

Created by: cvrebert

Unlike iOS Safari, OS X Safari doesn't support the temporal input types and just treats them like text inputs. Unfortunately, since our current CSS hack is Safari-specific rather than iOS-specific, it turns out that desktop Safari is (and has been, even prior to #18816) basically suffering from #17308 (closed). (Looks like nobody happened to test in OS X Safari previously.) There are some candidate hacks under the "Special Purpose" subsection of http://browserstrangeness.bitbucket.org/css_hacks.html#webkit which discriminate between iOS and other WebKit browsers and thus might be useful.