fade in link hover?

[eNvy]

-webkit-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
-ms-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;

For what its worth, -webkit is the only prefix you need now, -moz, -ms and -o were dropped a long time ago, only a few older versions of webkit still require the prefix (Past versions of Safari and old stock Android browsers).
http://caniuse.com/#feat=css-transitions

So, now all the browsers finally leave their own prefixes and accept the default tag?