.tri-blink {
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-left: 6px;
  margin-bottom: -4px;
  background-color: #FE5000;
  clip-path: polygon(0% 0%, 100% 0%, 50% 100%);
  animation: blink 1s steps(1, start) infinite;
  transform: translateY(-1px);
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0; }
}