The font family system is proposed by apple in 2015, available with prefix as -apple-system The idea behind is to allow the web author to make use of native fonts available on different platform running the browser. The font-family system is platform-specific rather browser specific. The same browser running on different platform/operating system will implement the generic font differently as available on that platform. body {
font-family: -apple-system, BlinkMacSystemFont, “Segoe UI”, Roboto, Helvetica, Arial, sans-serif;
} For more: https://lists.w3.org/Archives/Public/www-style/2015Jul/0169.html