[bingaling]

or css (shamelessly stolen from http://www.jwz.org/jwz.css):

  @keyframes         blink { 0% { opacity:1; } 75% { opacity:1; } 76% { opacity:0; } 100% { opacity:0; }}
  @-webkit-keyframes blink { 0% { opacity:1; } 75% { opacity:1; } 76% { opacity:0; } 100% { opacity:0; }}
  @-moz-keyframes    blink { 0% { opacity:1; } 75% { opacity:1; } 76% { opacity:0; } 100% { opacity:0; }}
  @-ms-keyframes     blink { 0% { opacity:1; } 75% { opacity:1; } 76% { opacity:0; } 100% { opacity:0; }}
  @-o-keyframes      blink { 0% { opacity:1; } 75% { opacity:1; } 76% { opacity:0; } 100% { opacity:0; }}

  blink {
    text-decoration:   inherit;
    animation:         blink 0.75s ease-in infinite alternate;
    -webkit-animation: blink 0.75s ease-in infinite alternate;
    -moz-animation:    blink 0.75s ease-in infinite alternate;
    -ms-animation:     blink 0.75s ease-in infinite alternate;
    -o-animation:      blink 0.75s ease-in infinite alternate;
  }