Body {font-family: "Helvetica Neue", Helvetica, Stheiti, Sans-serif;}
iOS 4.0+ uses the English font Helvetica Neue, before the iOS version is degraded using Helvetica.
The Chinese font is set to Chinese blackbody stheiti.
It should be added that the Chinese blackbody does not exist in the iOS font library (Http://support.apple.com/kb/HT5484?viewlocale=en_US), However, the system will automatically hit the Chinese blackbody Stheiti compatible with the system default English font Blackbody-Simple or bold-complex:
Heiti SC Light Blackbody-Jencine
Heiti SC Medium blackbody-Simplified Chinese Black
Heiti TC Light blackbody-complex fine body
Heiti TC Medium blackbody-Black
The default Sans serif font is selected for both Chinese fonts and English fonts under native Android.
4.0 before the version of the English font native Android uses the droid Sans, the Chinese font native Android will hit the droid Sans Fallback.
4.0+ both English and Chinese fonts will use the native Android new Roboto font.
Other third-party Android Systems also consistently select the default sans serif font.
Mobile web--font settings Best practices