System fonts
font-family: -apple-system, BlinkMacSystemFont,
"Segoe UI", "Roboto", "Oxygen",
"Ubuntu", "Cantarell", "Fira Sans",
"Droid Sans", "Helvetica Neue", sans-serif;
This uses whatever system font is available. See: System shock - Designing Medium (medium.com)
Explanation
| Font | OS |
|---|---|
-apple-system |
OS X (10.11+), iOS (9+) |
BlinkMacSystemFont |
OS X, Chrome |
Segoe UI |
Windows |
Roboto |
Android 4.0+ |
Oxygen |
Linux, KDE |
Ubuntu |
Linux, Ubuntu |
Cantarell |
Linux, Gnome |
Fira Sans |
Firefox OS |
Droid Sans |
Android (until 3.2) |
Helvetica Neue |
OS X (10.9) |