Apparently, I missed that you wanted a pulsing effect perhaps like the old blink tag. This updated example uses CSS animation, but there are other alternatives as well.
@keyframes pulse {
from { opacity: 1 }
to { opacity: 0 }
}
.fade:hover {
animation-name: pulse;
animation-duration: 500ms;
animation-iteration-count: infinite;
animation-direction: alternate;
animation-timing-function: ease-in-out;
}
<div class="fade">Fade On Hover</div>