[1] Safari 7.0 ( 版) <https://developer.apple.com/library/safari/releasenotes/General/WhatsNewInSafari/Articles/Safari_7_0.html#//apple_ref/doc/uid/TP40014305-CH5-SW9>
Kerning and ligatures for text display are now enabled by default; you can disable them, if necessary, by setting text-rendering:optimizeSpeed.