animations-keyframes.css

@-webkit-keyframes my-animation {
  0% {
    -webkit-transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
  }
}

animations-properties.css

#elem {
  width: 100px;
  height: 100px;
  background: red;
  -webkit-animation-name: my-animation;
  -webkit-animation-duration: 4s;
  -webkit-animation-iteration-count: infinite
  -webkit-animation-timing-function: linear;
}