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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <div id="field">12312312</div>
<script>
   
window.onload = function () {
​
  var field = document.getElementById('field');
  
  console.log(field);
  var activeElement;
  var offX = 0;
  var offY = 0;
  var mDown = function(e) {   
      console.log(e.target);
      activeElement = e.target;    
      offY = e.offsetY;
      offX = e.offsetX;
  };
  
  var mUp = function(e) {
      activeElement = null;
  };
  
  var mMove = function(e) {
      if(activeElement) {        
          activeElement.style.top = (e.clientY - offY) + 'px';
          activeElement.style.left = (e.clientX - offX) + 'px';
          activeElement.style.position="absolute";
​
      }
​
  };
​
  field.addEventListener('mousedown', mDown);
  field.addEventListener('mouseup', mUp);
  field.addEventListener('mousemove',mMove)
}
console.log(1);
  </script>
</body>
</html>
Output 300px

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anonymouspro
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