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<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  <div id="mydiv"></div>
</body>
</html>
​
 
#mydiv{
  position: absolute;
  top: 10px;
  left: 10px;
  width: 100px;
  height: 100px;
  border: 1px solid blue;
  background:red;
}
 
    var myFrame = {
      '0%': {
        left: 0,
        top: 0
      },
      '25%': {
        left: 100,
        top: 100
      },
      '50%': {
        left: 0,
        top: 300
      },
      '100%': {
        left: 0,
        top: 0
      }
    };
​
var keyframes = {
  set: function($el, frames, duration) {
    var animate;
    animate = function() {
      var spendTime;
      spendTime = 0;
      $.each(frames, function(idx, val) {
        var stepDuration, stepPercentage;
        stepPercentage = idx.replace('%', '') / 100;
        stepDuration = duration * stepPercentage - spendTime;
        $el.animate(val, stepDuration);
        return spendTime += stepDuration;
      });
      return setTimeout(animate, duration);
    };
    return animate();
  }
};
​
$(document).ready(function(){
  keyframes.set($('#mydiv'), myFrame, 2000); 
});
Output 300px

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