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HTML

              
                <button id="toggle">toggle</button>

<svg 
	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 250 250" class="svg">
   <path id="gear" d="M78.70226,123.79905c-0.26775,25.2445,20.35263,45.59713,45.59712,45.86488c24.95867,0,45.86489-20.62038,45.86489-45.59714
	c0-24.95865-20.62401-45.31128-45.59713-45.5935C99.32265,78.22001,78.70226,98.57264,78.70226,123.79905z M151.43623,2.77236
	c1.0891,8.40879,2.44594,16.54985,3.5314,24.6909c0,0.82136,0,1.35684,0.27138,2.17819
	c0.81772,2.71368,14.38614,7.31972,16.8176,5.42737c5.96286-4.33827,11.94383-8.68017,17.63895-13.30067
	c2.17819-1.89235,3.80278-1.35684,5.69513,0c13.03291,8.9624,23.88765,20.08488,32.83195,33.0997
	c1.35684,1.89597,1.35684,3.25281,0,5.15963c-4.60603,5.69511-8.95877,11.94382-13.29706,17.63895
	c-1.35684,1.89596-1.89595,3.53502-0.53911,5.69511c0.82133,1.35684,1.62457,2.71368,1.89595,4.07053
	c1.08546,6.24872,4.88826,8.14105,10.58337,8.41243c5.69873,0.26775,11.39384,1.6246,16.82121,2.17457
	c2.44594,0.26774,3.24919,1.08909,3.80278,3.2528c2.17456,11.39023,2.71368,23.06631,1.62459,34.45654
	c-0.26775,4.33829-1.08908,8.9624-1.89595,13.30067c-0.26776,1.0891-1.6246,2.44594-2.71368,2.71368
	c-7.31972,1.35684-14.92526,2.44594-22.24498,3.24919c-2.44592,0.27136-3.80276,1.08908-4.33827,3.53502
	c-0.26775,1.35684-0.82133,2.98143-1.62459,4.33827c-3.80278,5.15962-2.17819,9.49789,1.89233,13.83618
	c3.80278,4.34189,7.05196,8.96239,10.31923,13.56842c0.81775,1.08908,0.81775,3.53502,0.26776,4.60963
	c-8.96239,13.30067-20.08488,24.42316-33.38554,33.65331c-1.89235,1.35684-3.24919,1.08548-5.15964-0.27136
	c-5.6951-4.60603-11.9402-8.95879-17.63895-13.29706c-1.62457-1.35684-3.24918-1.89597-5.15599-0.53912
	c-1.35684,0.82135-2.98506,1.6246-4.60963,1.89597c-6.2451,1.08548-7.87331,5.15601-8.14105,10.85474
	c-0.26776,5.69511-1.35684,11.67245-2.44594,17.36758c-0.26775,1.08908-1.62459,2.71368-2.98143,2.98505
	c-16.01436,3.24919-31.74288,3.24919-47.75723,0.26775c-2.17818-0.26775-2.98144-1.35684-3.24919-3.53502
	c-0.82133-7.31972-2.17818-14.65752-2.98505-21.97722c-0.26775-2.44594-1.08548-3.80278-3.53141-4.33829
	c-1.08909-0.26775-2.44593-0.82133-3.53503-1.35684c-5.42737-3.80276-10.03339-2.71368-14.92526,1.89235
	c-3.80277,3.80278-8.67655,6.51646-13.0293,10.037c-1.89596,1.6246-3.2528,1.6246-5.15961,0.26776
	c-13.30067-9.23015-24.42316-20.35263-33.6533-33.65331c-1.35684-1.89233-1.08909-3.24918,0.26775-5.15961
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	c-0.82134-1.0891-1.62822-2.44594-1.62822-3.80278c-1.08547-7.32332-5.96287-8.68016-12.47932-9.23015
	c-5.42737-0.26775-10.85474-1.35684-16.01435-2.44592c-1.08547-0.26776-2.71369-1.89235-2.98143-2.98145
	c-3.24918-16.01434-3.24918-31.74648,0-47.75721c0.26775-1.0891,1.89596-2.71368,2.98143-2.71368
	c7.60555-1.35684,15.19663-2.17819,22.79856-3.53503c1.35684-0.26775,2.44593-1.6246,3.53502-2.71368
	c0.26775-0.26775,0.26775-1.08909,0.5355-1.6246c5.42737-7.60555,3.2528-14.10753-2.71369-20.35263
	c-2.98143-3.24918-5.69512-7.05195-8.14105-10.58698c-0.81772-1.08909-0.81772-3.24918-0.26775-4.33828
	c8.95877-13.56842,20.35263-24.6909,33.6533-33.92105c1.89235-1.35684,2.98144-1.08907,4.60603,0.26777
	c5.69511,4.60962,11.94383,8.96239,17.63895,13.30065c1.89596,1.35684,3.53502,1.89235,5.42737,0.53551
	c1.35684-0.81773,2.98143-1.6246,4.60964-1.89235c6.24509-1.08908,7.60194-5.1596,7.86968-10.58697
	c0.27137-5.69514,1.62821-11.39025,2.17818-17.09985c0.26775-2.71368,1.35684-3.53502,3.80277-3.80276
	C118.05069-0.76266,134.60054-0.76266,151.43623,2.77236z"/>
<path id="x" d="M125,250C55.96333,250,0,194.03667,0,125S55.96333,0,125,0s125,55.96334,125,125S194.03667,250,125,250z
	 M189.38667,83.98334l-23.38335-23.37001L125,101.62666L83.98333,60.61333l-23.37,23.37001L101.62667,125l-41.01334,41.01668
	l23.37,23.37L125,148.37334l41.01666,41.01334l23.38333-23.37L148.37334,125L189.38667,83.98334z"/>
</svg>

              
            
!

CSS

              
                .svg {
  width: 250px;
  height: 250px;
  margin: 20px auto;
  display: block;
}

#x {
  display: none;
}

body {
  text-align: center;
  padding: 20px;
}
              
            
!

JS

              
                var button = document.getElementById("toggle");

var morph = new TimelineMax({paused:true});
morph.to("#gear", 1, { morphSVG: "#x", ease:Power1.easeInOut });

button.addEventListener("click", function() {
  if (morph.progress() === 0) { //if it's at the beginning, start playing
    morph.play();
  } else { //otherwise toggle the direction on-the-fly
    morph.reversed( !morph.reversed() );
  }
});

              
            
!
999px
What did the HTML say to the CSS? I like your style.

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