My understanding has been that sans-serif would give you the operating system default sans-serif font and that every OS would support this. In what scenario would emoji fonts listed after sans-serif be reachable?
Github 2017-08-09
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol"