<div id="block">click me</div>
#block{
  	position:absolute;
    left: 50%;
    top: 50%;
    width: 100px;
    height: 100px;
    margin: -50px 0 0 -50px;
    background: #0c8;
    line-height: 100px;
    text-align: center;
    color: #fff;
    cursor: pointer;
    border-radius: 100%;
}
  block.addEventListener('click', function(){
    var self = this, startTime = Date.now(),
        r = 100, duration = 2000; 
    
  	requestAnimationFrame(function step(){
      var p = Math.min(1.0, (Date.now() - startTime) / duration);
      var rotation = -360 * p;
       
      self.style.transformOrigin = '0 ' + r + 'px';
      self.style.transform = 'rotate(' 
        + rotation + 'deg)';
      if(p < 1.0) requestAnimationFrame(step);
    });
  });

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