They do on Github[1] "hint.css works on all latest browsers, though the transition effect is supported only on IE10+, Chrome 26+ and FF4+ at present. * Chr

They do on Github[1] "hint.css works on all latest browsers, though the transition effect is supported only on IE10+, Chrome 26+ and FF4+ at present. * Chrome - basic + transition effects * Firefox - basic + transition effects * Opera - basic * Safari - basic * IE 10+ - basic + transition effects * IE 8 & 9 - basic" [1] https://github.com/chinchang/hint.css#browser-support https://github.com/chinchang/hint.css#browser-support