They do on Github[1] "hint.css works on all latest browsers, though the transiti...

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