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HTML 

              
                <h1>Three Ways to Animate SVG</h1>

<p>This robot dude is being animated in three differnet ways.</p>

<svg version="1.1" id="robot" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
	 viewBox="0 0 127.9 178.4" enable-background="new 0 0 127.9 178.4" xml:space="preserve">
<path id="left-leg" fill="#424143" d="M37.6,138.8c0-3.2-2-5.8-4.9-6.8c2.8-1,4.9-3.6,4.9-6.8c0-4-3.2-7.2-7.2-7.2h-4.6
	c-4,0-7.2,3.2-7.2,7.2c0,3.2,2,5.8,4.9,6.8c-2.8,1-4.9,3.6-4.9,6.8c0,3.1,2,5.8,4.8,6.8c-2.8,1-4.8,3.6-4.8,6.8c0,4,3.2,7.2,7.2,7.2
	h4.6c4,0,7.2-3.2,7.2-7.2c0-3.1-2-5.8-4.8-6.8C35.6,144.6,37.6,141.9,37.6,138.8z"/>
<path id="left-foot" fill="#424143" d="M47.5,178.4c-21.3,0-10.6,0-41.8,0c0-11.6,9.4-20.9,20.9-20.9
	C38.2,157.5,47.5,166.8,47.5,178.4z">
  <animate attributeName="fill" dur="5000ms" to="#f06d06" fill="freeze" />  
</path>
<path id="right-leg" fill="#424143" d="M90.3,138.9c0-3.2,2-5.8,4.9-6.8c-2.8-1-4.9-3.6-4.9-6.8c0-4,3.2-7.2,7.2-7.2h4.6
	c4,0,7.2,3.2,7.2,7.2c0,3.2-2,5.8-4.9,6.8c2.8,1,4.9,3.6,4.9,6.8c0,3.1-2,5.8-4.8,6.8c2.8,1,4.8,3.6,4.8,6.8c0,4-3.2,7.2-7.2,7.2
	h-4.6c-4,0-7.2-3.2-7.2-7.2c0-3.1,2-5.8,4.8-6.8C92.3,144.6,90.3,142,90.3,138.9z"/>
<path id="right-foot" fill="#424143" d="M80.4,178.4c21.3,0,10.6,0,41.8,0c0-11.6-9.4-20.9-20.9-20.9
	C89.7,157.5,80.4,166.9,80.4,178.4z"/>
<path id="left-eye-stem" fill="#424143" d="M49.8,15.4C49.8,6.9,42.9,0,34.4,0C25.9,0,19,6.9,19,15.4c0,7.4,5.2,13.5,12.1,15
	c0.3,2,1.8,10.6,6,17.8l5.9-3.4c-3.1-5.4-4.5-11.8-5-14.5C44.8,28.7,49.8,22.6,49.8,15.4z"/>
<circle id="left-eye" fill="#FFFFFF" cx="34.4" cy="15.4" r="10.6"/>
<circle id="left-pupil" fill="#424143" cx="34.4" cy="15.4" r="4.8"/>
<path id="right-eye-stem" fill="#424143" d="M78.1,15.4c0-8.5,6.9-15.4,15.4-15.4s15.4,6.9,15.4,15.4c0,7.4-5.2,13.5-12.1,15
	c-0.3,2-1.8,10.6-6,17.8l-5.9-3.4c3.1-5.4,4.5-11.8,5-14.5C83.1,28.8,78.1,22.7,78.1,15.4z"/>
<path id="body" fill="#424143" d="M64,80c-0.1,0-0.1,0-0.2,0C40.5,80,17.5,80,0,80c0,34.5,27.9,62.4,62.4,62.4c0.5,0,1,0,1.5,0
	c0.5,0,1,0,1.6,0c34.5,0,62.4-27.9,62.4-62.4C110.4,80,87.4,80,64,80z"/>
<path id="head" fill="#424143" d="M64,35.5L64,35.5C64,35.5,64,35.5,64,35.5C64,35.5,64,35.5,64,35.5c-0.1,0-0.1,0-0.1,0
	c0,0,0,0,0,0v0c-21,0.1-38,17.1-38,38.1c11,0,24.6,0,38,0c0.1,0,0.1,0,0.2,0c13.4,0,27,0,38,0C102,52.7,85,35.6,64,35.5z"/>
<circle id="right-eye" fill="#FFFFFF" cx="93.5" cy="15.4" r="10.6"/>
<circle id="right-pupil" fill="#424143" cx="93.5" cy="15.4" r="4.8"/>
<polygon id="mouth" fill="#FFFFFF" points="64,62 63.9,62 46.3,62 46.3,67.3 63.9,67.3 64,67.3 81.6,67.3 81.6,62 "/>
</svg>

<ol>
  <li>The right eye pulsates red with CSS @keyframes</li>
  <li>The left pupil expands lightgreen with SnapSVG</li>
  <li>The left foot turns to orange with &lt;animate></li>
</ol>
!

CSS 

              
                svg {
  width: 150px;
  border: 10px solid #ccc;
  float: left;
  margin-right: 20px;
}

#right-eye {
  animation: redeye 2s infinite alternate;
}

@keyframes redeye {
  to {
    fill: red;
  }
}

body {
  padding: 20px;
}
h1 {
  margin: 0;
}
ol {
  list-style-position: inside;
}
li {
  margin: 0 0 5px 0;
}
!

JS 

              
                var s = Snap("#robot");

var leftPupil = s.select("#left-pupil");

leftPupil.attr({
  fill: "green"
});

leftPupil.animate({
  r: 50,
  fill: "lightgreen"
}, 1000);
!
999px

Console