animation css onclick code example

Example 1: how do I make and animation start on click in js

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<style type="text/css">
.classname {
  -webkit-animation-name: cssAnimation;
  -webkit-animation-duration:3s;
  -webkit-animation-iteration-count: 1;
  -webkit-animation-timing-function: ease;
  -webkit-animation-fill-mode: forwards;
}
@-webkit-keyframes cssAnimation {
  from {
    -webkit-transform: rotate(0deg) scale(1) skew(0deg) translate(100px);
  }
  to {
    -webkit-transform: rotate(0deg) scale(2) skew(0deg) translate(100px);
  }
}
</style>
<script type="text/javascript">
  function ani(){
    document.getElementById('img').className ='classname';
  }
</script>
<title>Untitled Document</title>
</head>

<body>
<input name="" type="button" onclick="ani()" />
<img id="img" src="clogo.png" width="328" height="328" />
</body>
</html>

Example 2: css onclick animation

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.button {
  padding: 15px 25px;
  font-size: 24px;
  text-align: center;
  cursor: pointer;
  outline: none;
  color: #fff;
  background-color: #4CAF50;
  border: none;
  border-radius: 15px;
  box-shadow: 0 9px #999;
}

.button:hover {background-color: #3e8e41}

.button:active {
  background-color: #3e8e41;
  box-shadow: 0 5px #666;
  transform: translateY(4px);
}
</style>
</head>
<body>

<h2>Animated Buttons - "Pressed Effect"</h2>

<button class="button">Click Me</button>

</body>
</html>