I used the blink property for text decoration and it wasn't effected. Why?

Answer 1

It's not really supported, it doesn't have an obvious point.
But still, it's not that hard to imitate it:
.blink {
animation: blink 1s linear infinite;
}
@keyframes blink {
0% {
opacity: 1;
}
50% {
opacity: 1;
}
50.1% {
opacity: 0;
}
100% {
opacity: 0;
}
}

Answer 2

Thank you